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Lattice realization of the axial U(1) non-invertible symmetry Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2024-03-13 Yamato Honda, Okuto Morikawa, Soma Onoda, Hiroshi Suzuki
In U(1) lattice gauge theory with compact U(1) variables, we construct the symmetry operator, i.e., the topological defect, for the axial U(1) non-invertible symmetry. This requires a lattice formulation of chiral gauge theory with an anomalous matter content and we employ the lattice formulation on the basis of the Ginsparg–Wilson relation. The invariance of the symmetry operator under the gauge transformation
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Remarks on effects of projective phase on eigenstate thermalization hypothesis Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2024-03-13 Osamu Fukushima
The existence of p-form symmetry in (d + 1)-dimensional quantum field is known to always lead to the breakdown of the eigenstate thermalization hypothesis (ETH) for certain (d − p)-dimensional operators other than symmetry operators under some assumptions. The assumptions include the mixing of symmetry sectors within a given energy shell, which is rather challenging to verify because it requires information
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Thermodynamic topology of black holes in f(R) gravity Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2024-03-05 Bidyut Hazarika, Prabwal Phukon
In this work, we study the thermodynamic topology of a static, a charged static and a charged, rotating black hole in f(R) gravity. For charged static black holes, we work in two different ensembles: fixed charge(q) ensemble and fixed potential(φ) ensemble. For charged, rotating black hole, four different types of ensembles are considered: fixed (q, J), fixed (φ, J), fixed (q, Ω) and fixed (φ, Ω) ensemble
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Matrix regularization for gauge theories Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2024-03-02 Hiroyuki Adachi, Goro Ishiki, Satoshi Kanno
We consider how gauge theories can be described by matrix models. Conventional matrix regularization is defined for scalar functions and is not applicable to gauge fields, which are connections of fiber bundles. We clarify how the degrees of freedom of gauge fields are related to the matrix degrees of freedom, by formulating the Seiberg-Witten map between them.
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Decays of standard model like higgs boson h → γγ, Zγ in a minimal left-right symmetric model Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2024-03-02 T T Hong, V K Le, L T T Phuong, N C Hoi, N T K Ngan, N H T Nha
Two decay channels h → γγ, Zγ of the Standard Model-like Higgs in a left-right symmetry model are investigated under recent experimental data. We will show there exist one-loop contributions that affect the h → Zγ amplitude, but not the h → γγ amplitude. From numerical investigations, we show that the signal strength μZγ of the decay h → Zγ is still constrained strictly by that of h → γγ, namely $|\Delta
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Convergence of Ginzburg-Landau expansions: superconductivity in the BCS theory and chiral symmetry breaking in the NJL model Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2024-03-02 William Gyory, Naoki Yamamoto
We study the convergence of the Ginzburg-Landau (GL) expansion in the context of the Bardeen-Cooper-Schrieffer (BCS) theory for superconductivity and the Nambu–Jona-Lasinio (NJL) model for chiral symmetry breaking at finite temperature T and chemical potential μ. We present derivations of the all-order formulas for the coefficients of the GL expansions in both systems under the mean-field approximation
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On thermal transition in QCD Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2024-03-01 Masanori Hanada, Hiromasa Watanabe
We describe how the general mechanism of partial deconfinement applies to large-N QCD and the partially-deconfined phase inevitably appears between completely-confined and completely-deconfined phases. Furthermore, we propose how the partial deconfinement can be observed in the real-world QCD with the SU(3) gauge group. For this purpose, we employ lattice configurations obtained by the WHOT-QCD collaboration
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Theory of CP angles measurements Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2024-02-25 Amarjit Soni
In the early 80’s Sanda-san and collaborators wrote key papers on the direct and clean determination of the unitarity angle φ1 (β). This motivated many of us for analogously coming up with ways for direct and clean determinations of the other two unitarity angles, φ2(α) and φ3(γ). Current status of these direct determinations as well as our expectations for when Belle-II has 50 ab−1 of luminosity and
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Nambu-bracket for three-dimensional ideal fluid dynamics and magnetohydrodynamics Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2024-02-17 Yasuhide Fukumoto, Rong Zou
The ideal magnetohydrodynamics (MHD) as well as the ideal fluid dynamics is governed by the Hamilton equation with respect to the Lie-Poisson bracket. The Nambu bracket manifestly represents the Lie-Poisson structure in terms of derivative of the Casimir invariants. We construct a compact Nambu-bracket representation for the three-dimensional ideal MHD equations, with use of three Casimirs for the
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First Study of the PIKACHU Project: Development and Evaluation of High-Purity Gd3Ga3Al2O12:Ce Crystals for 160Gd Double Beta Decay Search Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2024-02-17 Takumi Omori, Takashi Iida, Azusa Gando, Keishi Hosokawa, Kei Kamada, Keita Mizukoshi, Yasuhiro Shoji, Masao Yoshino, Ken-Ichi Fushimi, Hisanori Suzuki, Kotaro Takahashi
Uncovering neutrinoless double beta decay (0ν2β) is crucial for confirming neutrinos’ Majorana characteristics. The decay rate of 0νββ is theoretically uncertain, influenced by nuclear matrix elements that vary across nuclides. To reduce this uncertainty, precise measurement of the half-life of neutrino-emitting double beta decay (2ν2β) in different nuclides is essential. We have launched the PIKACHU
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Enhanced classical radiation damping of electronic cyclotron motion in the vicinity of the Van Hove singularity in a waveguide Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2024-02-10 Yuki Goto, Savannah Garmon, Tomio Petrosky
We study the damping process of electron cyclotron motion and the resulting emission in a waveguide using the classical Friedrichs model without relying on perturbation analysis such as Fermi’s golden rule. A Van Hove singularity appears at the lower bound (or cut-off frequency) of the dispersion associated with each of the electromagnetic field modes in the waveguide. In the vicinity of the Van Hove
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Gadolinium concentration measurement with an atomic absorption spectrophotometer Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2024-02-10 Ll Marti, L Labarga
Because gadolinium (Gd) has the highest thermal neutron capture cross section, resulting in an 8 MeV gamma cascade upon capture, it has been proposed for dissolution in water Cherenkov detectors to achieve efficient neutron tagging capabilities. While metallic Gd is insoluble in water, several compounds are very easy to dissolve. Gadolinium sulfate, Gd2(SO4)3, has been thoroughly tested and proposed
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Eigenphase distributions of unimodular circular ensembles Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2024-02-07 Shinsuke Nishigaki
Motivated by the study of Polyakov lines in gauge theories, Hanada and Watanabe Hanada and Watanabe [1] recently presented a conjectured formula for the distribution of eigenphases of Haar-distributed random SU(N) matrices (β = 2), supported by explicit examples at small N and by numerical samplings at larger N. In this letter, I spell out a concise proof of their formula, and present its orthogonal
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Toward nuclear physics from lattice QCD on quantum computers Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2024-02-07 Arata Yamamoto, Takumi Doi
One of the ultimate missions of lattice QCD is to simulate atomic nuclei from the first principle of the strong interaction. This is an extremely hard task for the current computational technology, but might be reachable in coming quantum computing era. In this paper, we discuss the computational complexities of classical and quantum simulations of lattice QCD. It is shown that the quantum simulation
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Relation between pole and running masses of heavy quarks using the principle of maximum conformality Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2024-02-06 Daniel Salinas-Arizmendi, Iván Schmidt
The relation of the pole and running heavy quark masses of order O $(\alpha _s^4)$ in perturbative quantum chromodynamics (pQCD) can be obtained using the Principle of Maximum Conformality (PMC), a formalism that provides a rigorous method for eliminating renormalization scale and scheme ambiguities for observables in pQCD. Using PMC, an optimal renormalization scale for the heavy quark mass ratio
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Quantum euler angles and agency-dependent spacetime Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2024-01-29 G Amelino-Camelia, V D’Esposito, G Fabiano, D Frattulillo, P A Höhn, F Mercati
Quantum gravity is expected to introduce quantum aspects into the description of reference frames. Here we begin exploring how quantum gravity induced deformations of classical symmetries could modify the transformation laws among reference frames in an effective regime. We invoke the quantum group SUq(2) as a description of deformed spatial rotations and interpret states of a representation of its
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Casimir effect of Lorentz-violating charged Dirac in background magnetic field Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2024-01-27 Ar Rohim, Arista Romadani, Apriadi Salim Adam
We study the effect of the Lorentz violation on the Casimir energy and pressure of charged Dirac in a background uniform magnetic field. In the model, the Lorentz violation is parameterized not only by the intensity but also by its direction. We investigate two cases of the direction of violation, namely, time-like and space-like vector cases. We use the boundary condition of the MIT bag model to represent
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Search for dark energy with neutron interferometry Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2024-01-25 Hauke Fischer, Christian Käding, Hartmut Lemmel, Stephan Sponar, Mario Pitschmann
We use previously obtained experimental results by neutron interferometry to effectively constrain the parameter space of several prominent dark energy models. This investigation encompasses the environment-dependent dilaton field, a compelling contender for dark energy that emerges naturally within the strong coupling limit of string theory, alongside symmetron and chameleon fields. Our study presents
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Heavy ion injection of fixed-field alternating gradient accelerator Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2024-01-25 Yujiro Yonemura, Hidehiko Arima, Hiroki Nishibata, Takashi Teranishi, Tomotsugu Wakasa, Nobuo Ikeda, Kenichi Watanabe, Nobuhiro Shigyo, Tatsunori Iwamura, Kyosuke Adachi, Koki Takamatsu, Motoki Kotani, Hisato Tanaka, Rintaro Matsunaga, Taichi Matsumoto, Kyohei Takenaka, Takafumi Kajihara, Sotaro Matsunaga, Yusuke Shinohara, Yoshiharu Mori
Much research in recent years has focused on circular accelerators that accelerate and store secondary particles with a large momentum spread, such as muons, unstable nuclei and heavy ions with different charge states. A fixed field alternating gradient (FFAG) accelerator with large transverse and momentum acceptance has obvious advantages for such requirements. A versatile beam injection method is
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Analytic electrical charged black holes in F(R)-ModMax theory Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2024-01-24 Behzad Eslam Panah
Motivated by a new model of nonlinear electrodynamics known as Modified Maxwell (ModMax) theory, an exact analytical solution for black holes is obtained by coupling ModMax nonlinear electrodynamics and F(R) gravity. Then, the effects of the system’s parameters (F(R)-ModMax gravity parameters) on the event horizons are analyzed. The obtained black holes thermodynamic properties in the F(R)-ModMax theory
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Control of frustrated nonsequential double ionization channels with the carrier-envelope phase of elliptically polarized laser pulses Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2024-01-24 Tong-Tong Xu, Lian-Lian Zhang, Wei-Jiang Gong
Using a classical approach, we theoretically investigate the frustrated double ionization (FDI) of Ar atoms under elliptically polarized (EP) laser fields. Its FDI yield is calculated as a function of laser intensity with different carrier-envelope phases (CEPs), and, similar to the carrier-envelope phase (CEP) dependence of nonsequential double ionization (NSDI), several knee-shaped structures appear
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On the kinematics of (p, pX) knockout reactions in normal and inverse kinematics Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2024-01-22 Tomohiro Uesaka
The kinematics of (p, pX) knockout reactions is overviewed. Consistent descriptions of the kinematical quantities for normal and inverse kinematics are given. Starting from the kinematics of p-X elastic scatterings, which are elementary processes of the (p, pX) knockout reactions, effects of the separation energy of the knocked-out particle SX, its in-nucleus momentum $\vec{k}_{F}$, and a momentum
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Equivalence of lattice operators and graph matrices Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2024-01-20 Jun Yumoto, Tatsuhiro Misumi
We explore the relationship between lattice field theory and graph theory, placing special emphasis on the interplay between Dirac and scalar lattice operators and matrices within the realm of spectral graph theory. Beyond delving into fundamental concepts of spectral graph theory, such as adjacency and Laplacian matrices, we introduce a novel matrix named as “anti-symmetrized adjacency matrix”, specifically
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Pointing calibration of GroundBIRD telescope using Moon observation data Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2024-01-18 Y Sueno, J J A Baselmans, A H M Coppens, R T Génova-Santos, M Hattori, S Honda, K Karatsu, H Kutsuma, K Lee, T Nagasaki, S Oguri, C Otani, M Peel, J Suzuki, O Tajima, T Tanaka, M Tsujii, D J Thoen, E Won
Understanding telescope pointing (i.e., line of sight) is important for observing the cosmic microwave background (CMB) and astronomical objects. The Moon is a candidate astronomical source for pointing calibration. Although the visible size of the Moon (30’) is larger than that of the planets, we can frequently observe the Moon once a month with a high signal-to-noise ratio. We developed a method
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Exactness of the first born approximation in electromagnetic scattering Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2024-01-18 Farhang Loran, Ali Mostafazadeh
For the scattering of plane electromagnetic waves by a general possibly anisotropic stationary linear medium in three dimensions, we give a condition on the permittivity and permeability tensors of the medium under which the first Born approximation yields the exact expression for the scattered wave whenever the incident wavenumber k does not exceed a pre-assigned value α. We also show that under this
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Entropy-area law and temperature of de Sitter horizons from modular theory Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2024-01-17 Edoardo D’Angelo, Markus B Fröb, Stefano Galanda, Paolo Meda, Albert Much, Kyriakos Papadopoulos
We derive an entropy-area law for the future horizon of an observer in diamonds inside the static patch of de Sitter spacetime, taking into account the backreaction of quantum matter fields. We prove positivity and convexity of the relative entropy for coherent states using Tomita–Takesaki modular theory, from which the QNEC for diamonds follows. Furthermore, we show that the generalized entropy conjecture
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Simple-sum giant graviton expansions for orbifolds and orientifolds Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2024-01-11 Shota Fujiwara, Yosuke Imamura, Tatsuya Mori, Shuichi Murayama, Daisuke Yokoyama
We study giant graviton expansions of the superconformal index of 4d orbifold/orientifold theories. In general, a giant graviton expansion is given as a multiple sum over wrapping numbers. It has been known that the expansion can be reduced to a simple sum for the ${\cal N}=4$U(N) SYM by choosing appropriate expansion variables. We find such a reduction occurs for a few examples of orbifold and orientifold
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The curious early history of CKM matrix -miracles happen!- Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2024-01-11 Stephen Lars Olsen
The 1973 Kobayashi Maskawa paper proposed a compelling link between Cabibbo’s flavor-mixing scheme and ${\mathcal {C}}$${\mathcal {P}}$violation but, since it required the existence of six quarks at a time when the physics community was happy with only three, it received zero attention. However, two years after the paper appeared—at which time it had received a grand total of two citations—the charmed
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Advantages of the Kirkwood–Dirac distribution among general quasi-probabilities on finite-state quantum systems Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2024-01-11 Shun Umekawa, Jaeha Lee, Naomichi Hatano
We investigate properties of quasi-joint-probability (QJP) distributions on finite-state quantum systems, especially the two- and three-state systems, based on the general framework of quantum/quasi-classical representations [1,2]. We show that the Kirkwood–Dirac distribution is a prime candidate among the QJP distributions that behave well in view of the following two perspectives: the information
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Gravitational wave search through electromagnetic telescopes Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2024-01-11 Asuka Ito, Kazunori Kohri, Kazunori Nakayama
We study the graviton-photon conversion in the magnetic fields of the Earth, the Milky Way Galaxy, and intergalactic regions. Requiring that the photon flux converted from gravitons does not exceed the observed photon flux with telescopes, we derive upper limits on the stochastic gravitational waves in frequency ranges from 107Hz to 1035Hz. Remarkably, the upper limits on h2ΩGW could be less than unity
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Exploring the potential use of silver-exchanged zeolites for adsorption of radon traces in low background experiments Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2023-12-31 Oleksandra Veselska, Olivier Llido, Marie-Cécile Piro, Shefali Vaidya, Steven Kuznicki, José Busto
Radon is an important source of radioactive background in experiments searching for rare decays and in the field of low energy particle physics. Here, we report the first temperature-dependent study of radon adsorption on silver-exchanged zeolites from several commercial producers. Among the three tested zeolites, Ag-ETS-10 showed the best result. Hence, it was chosen for the further study of internal
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Phase transitions of the four-state Potts model on the square and the honeycomb lattices Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2023-12-23 Jhao-Hong Peng, Fu-Jiun Jiang
It is widely believed that the phase transition for the four-state ferromagnetic Potts model on the square lattice is of the pseudo-first order. Specifically, it is expected that first-order phase transition behavior is found on small lattices and that the true nature of second-order phase transition only emerges with large system sizes. It is also intuitively expected that for other geometries, the
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Attractive gravity probe surface, positivity of quasi-local mass and Arnowitt-Deser-Misner mass expression Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2023-12-23 Tetsuya Shiromizu, Keisuke Izumi
Under certain conditions, it is shown that the positivity of the Geroch/Hawking quasi-local mass holds for the attractive gravity probe surfaces in any higher dimensions than three. We also comment on the Arnowitt-Deser-Misner mass.
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What is a real black hole ? Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2023-12-23 Hirotaka Sugawara
Four dimensional Einstein equation with non-vanishing energy momentum tensor is solved to give a solution where the event hori- zon of a celestial body is outside of the body, which corresponds to a black hole by definition. There is no singularity at the center of the object unlike the case of Schwarzschild solution. We do not have the gravitational collapseWe do not have the gravitational collapse
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Statistical Mechanics Approach to the Holographic Renormalization Group : Bethe Lattice Ising Model and p-adic AdS/CFT Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2023-12-19 Kouichi Okunishi, Tadashi Takayanagi
The Bethe lattice Ising model —a classical model of statistical mechanics for the phase transition— provides a novel and intuitive understanding of the prototypical relationship between tensor networks and Anti-de Sitter (AdS)/conformal field theory (CFT) correspondence. After analytically formulating a holographic renormalization group for the Bethe lattice model, we demonstrate the underlying mechanism
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Exact WKB analysis and TBA equations for the stark effect Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2023-12-14 Katsushi Ito, Jingjing Yang
We apply the exact WKB analysis to a couple of one-dimensional Schrödinger-type equations reduced from the Stark effect of hydrogen in a uniform electric field. By introducing Langer’s modification and incorporating the Stokes graphs, we prove the exactness of the Bohr-Sommerfeld quantization conditions for the Borel-resummed quantum WKB periods in the specific parameter regions of the electric field
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Non-perturbative SQED beta function using functional renormalization group approach and the NSVZ exact beta function Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2023-12-12 Jeremy Echeverria Puentes, Iván Schmidt
The renormalization group equations of massive $\mathcal {N}=1$ supersymmetric quantum electrodynamics (SQED) are studied using the functional renormalization group approach. A non-perturbative form of the beta function has been computed via a derivative expansion of the effective action. In the local potential approximation, the functional form of the non-perturbative beta function is closely related
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Phase diagram near the quantum critical point in Schwinger model at θ = π: analogy with quantum Ising chain Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2023-12-10 Hiroki Ohata
The Schwinger model, one-dimensional quantum electrodynamics, has CP symmetry at θ = π due to the topological nature of the θ term. At zero temperature, it is known that as increasing the fermion mass, the system undergoes a second-order phase transition to the CP broken phase, which belongs to the same universality class as the quantum Ising chain. In this paper, we obtain the phase diagram near the
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Topologically nontrivial three-body contact interaction in one dimension Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2023-12-06 Satoshi Ohya
It is known that three-body contact interactions in one-dimensional n( ≥ 3)-body problems of nonidentical particles can be topologically nontrivial: they are all classified by unitary irreducible representations of the pure twin group PTn. It was, however, unknown how such interactions are described in the Hamiltonian formalism. In this paper, we study topologically nontrivial three-body contact interactions
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The Petz (lite) recovery map for scrambling channel Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2023-12-06 Yasuaki Nakayama, Akihiro Miyata, Tomonori Ugajin
We study properties of the Petz recovery map in chaotic systems, such as the Hayden-Preskill setup for evaporating black holes and the SYK model. Since these systems exhibit the phenomenon called scrambling, we expect that the expression of the recovery channel $\mathcal {R}$ gets simplified, given by just the adjoint $\mathcal {N}^{\dagger }$ of the original channel $\mathcal {N}$ which defines the
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Global density-dependent α-nucleon interaction for α-nucleus elastic scattering Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2023-12-06 T Furumoto, K Tsubakihara, S Ebata, W Horiuchi
We provide a global density-dependent 4He-nucleon (DD-αN) interaction to construct the α-nucleus optical model potential (OMP) in a wide range of incident energies. The global parametrization for the DD-αN interaction is obtained based on the proton-4He OMP which reproduces the elastic scattering cross-section data very well in the incident energies of 12.04–500 MeV per nucleon. We derive the α-nucleus
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Impurity and hybridization effects on the symmetry classification and magnetic response function of a two-band superconductor with inter-band pairing order Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2023-12-05 F Aghamohammadi Renani, H Yavari
The effects of hybridization and impurities (magnetic and nonmagnetic) potentials on the pairing symmetries and magnetic response of a two-band superconductor with equal-time s-wave inter-band pairing order parameter in the framework of Green's function technique are investigated theoretically. First, the effects of spin-independent and spin-dependent hybridization on the generation of even- or odd-frequency
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Boosting dark matter searches at muon colliders with Machine Learning: the mono-Higgs channel as a case study Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2023-12-04 Mohamed Belfkir, Adil Jueid, Salah Nasri
The search for dark-matter (DM) candidates at high-energy colliders is one of the most promising avenues to understand the nature of this elusive component of the universe. Several searches at the Large Hadron Collider (LHC) have strongly constrained a wide range of simplified models. The combination of the bounds from the LHC with direct-detection experiments exclude the most minimal scalar singlet
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High-pressure xenon gas time projection chamber with scalable design and its performance at around the Q value of 136Xe double-beta decay Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2023-12-04 Masashi Yoshida, Kazuhiro Nakamura, Shinichi Akiyama, Sei Ban, Junya Hikida, Masanori Hirose, Atsuko K Ichikawa, Yoshihisa Iwashita, Yukimasa Kashino, Tatsuya Kikawa, Akihiro Minamino, Kentaro Miuchi, Yasuhiro Nakajima, Kiseki D Nakamura, Tsuyoshi Nakaya, Shuhei Obara, Ken Sakashita, Hiroyuki Sekiya, Hibiki Shinagawa, Bungo Sugashima, Soki Urano
We have been developing a high-pressure xenon gas time projection chamber (TPC) to search for neutrinoless double beta (0νββ) decay of 136Xe. The unique feature of this TPC is in the detection part of ionization electrons, called ELCC. ELCC is composed of multiple units, and one unit covers 48.5cm2. A 180L size prototype detector with 12 units, 672 channels, of ELCC was constructed and operated with
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Unitarity Violation in Field Theories of Lee-Wick’s Complex Ghost Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2023-12-02 Jisuke Kubo, Taichiro Kugo
Theories with fourth-order derivatives, including the Lee-Wick finite QED model and Quadratic Gravity, have a better UV behaviour, but the presence of negative metric ghost modes endanger unitarity. Noticing that the ghost acquires a complex mass by radiative corrections, Lee and Wick, in particular, claimed that such complex ghosts would never be created by collisions of physical particles because
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Energy-Momentum and Angular Momentum Densities in Poincaré Gauge Theory of Gravity Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2023-11-30 Toshiharu Kawai
In Poincaré gauge theory of gravity, we examine energy-momentum and angular momentum densities of source of the gravitational field (gauge potentials Akμ, Aklμ). There are two types of these quantities, the Hilbert-type densities $\mbox{$\Theta $}_{k}{}^{\mu },\, \mbox{$\Phi $}_{kl}{}^{\mu }$ which appear in the right-hand sides of gravitational field equations, and $\, ^{M}\mbox{$T$}_{k}{}^{\mu }
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Development of fast-response PPAC with strip-readout for heavy-ion beams Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2023-11-24 Shutaro Hanai, Shinsuke Ota, Reiko Kojima, Shoichiro Masuoka, Masanori Dozono, Nobuaki Imai, Shin’ichiro Michimasa, Susumu Shimoura, Juzo Zenihiro, Kento Inaba, Yuto Hijikata, Ru Longhi, Ryo Nakajima
A strip-readout parallel-plate avalanche counter (SR-PPAC) has been developed aiming at the high detection efficiency and good position resolution in high-intensity heavy-ion measurements. The performance was evaluated using 115 MeV/u 132Xe, 300 MeV/u 132Sn, and 300 MeV/u 48Ca beams. A detection efficiency beyond 99% for these beams is achieved even at an incident beam intensity of 0.7 million particles
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Studying the impact of deuteron non-elastic breakup on 93Zr + d reaction cross sections measured at 28 MeV/nucleon Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2023-11-16 Thomas Chillery, Jongwon Hwang, Masanori Dozono, Nobuaki Imai, Shin’ichiro Michimasa, Toshiyuki Sumikama, Nobuyuki Chiga, Shinsuke Ota, Shinsuke Nakayama, Deuk Soon Ahn, Olga Beliuskina, Kazuya Chikaato, Naoki Fukuda, Seiya Hayakawa, Eiji Ideguchi, Kotaro Iribe, Chihiro Iwamoto, Shoichiro Kawase, Keita Kawata, Noritaka Kitamura, Kensuke Kusaka, Shoichiro Masuoka, Hareru Miki, Hiroari Miyatake, Daisuke
The deuteron is a loosely bound system which can easily break up into its constituent proton and neutron whilst in the presence of Coulomb and nuclear fields. Previous experimental studies have shown that this breakup process has a significant impact on residual nucleus production from deuteron bombardment in the high energy range of 50 – 210 MeV/nucleon. However, there remains a lack of cross-section
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Real eigenvector distributions of random tensors with backgrounds and random deviations Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2023-11-16 Naoki Sasakura
As in random matrix theories, eigenvector/value distributions are important quantities of random tensors in their applications. Recently, real eigenvector/value distributions of Gaussian random tensors have been explicitly computed by expressing them as partition functions of quantum field theories with quartic interactions. This procedure to compute distributions in random tensors is general, powerful
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Development of a low-background HPGe detector at Kamioka Observatory Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2023-11-10 K Ichimura, H Ikeda, Y Kishimoto, M Kurasawa, A A Suzuki, Y Gando, M Ikeda, K Hosokawa, H Sekiya, H Ito, A Minamino, S Suzuki
A new ultra-low background high-purity germanium (HPGe) detector has been installed at the Kamioka underground experimental site. The background count rate in the energy range from 40 keV to 2700 keV is about 25% lower than that of the first HPGe detector installed in 2016, which has the same detector specification and similar shielding geometry. This paper describes the shielding configuration, including
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Lepton universality violation in the minimal flipped 331 model Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2023-11-10 P N Thu, N T Duy, A E Cárcamo Hernández, D T Huong
We perform a detailed study of the b → cτν and b → sl+l− processes in a minimal flipped 331 model based on the SU(3)C × SU(3)L × U(1)X gauge symmetry. The non universal SU(3)L × U(1)X symmetry in the lepton sector gives rise to non universal neutral and charged currents involving heavy non SM gauge bosons and SM leptons that yield radiative contributions to the b → s, b → c, s → u and d → u transitions
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A meta-analysis of distance measurements to M87 Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2023-11-10 Gunasekar Ramakrishnan, Shantanu Desai
We obtain the median, arithmetic mean, and the weighted mean-based central estimates for the distance to M87 using all the measurements collated in [1]. We then reconstruct the error distribution for the residuals of the combined measurements and also splitting them based on the tracers used. We then checked for consistency with a Gaussian distribution and other symmetric distributions such as Cauchy
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Representation of degree correlation using eigenvalue decomposition and its application to epidemic models Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2023-11-07 Satoru Morita
Degree correlation plays a crucial role in studying network structures; however, its varied forms pose challenges to understanding its impact on network dynamics. This study devised a method that uses eigenvalue decomposition to characterize degree correlations. Additionally, the applicability of this method was demonstrated by approximating the basic and type reproduction numbers in an epidemic network
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Flavour Physics at LHCb — 50 years of the KM paradigm Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2023-11-07 Patrick Koppenburg
The LHCb experiment is in operation since 2009 and has provided measurements of the KM matrix with unprecedented precision. 50 years after the original paper we are in the position of pinning down the parameters of the theory, or possibly to show its limitations. In these proceedings the status of LHCb is shown in a historical perspective, along with some anecdotes.
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Fixed-energy inverse scattering with RBF neural networks and its application to neutron-α interactions Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2023-10-29 Gábor Balassa
This paper proposes a data-driven method to solve the fixed-energy inverse scattering problem for radially symmetric potentials with radial basis function (RBF) neural networks in an open-loop control system. The method estimates the scattering potentials in the Fourier domain by training an appropriate number of RBF networks, while the control step is carried out in the coordinate-space by using the
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Flavor physics beyond the Standard Model and the Kobayashi-Maskawa legacy Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2023-10-23 Gino Isidori
The Kobayashi-Maskawa (KM) hypothesis about the existence of a third generation of quarks represents a cornerstone of the Standard Model (SM). Fifty years after this seminal paper, flavor physics continues to represent a privileged observatory on physics occurring at high energy scales. In this paper I first review this statement using general effective-theory arguments, highlighting some interesting
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Conformal Symmetry and Effective Potential: I. Vacuum Vz, x-operation for the Green functions Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2023-10-07 I V Anikin
We begin a series of two papers that is devoted to the study of the multi-loop effective potential evolution in ϕ4-theory using the conformal symmetry. In the first part, we introduce and describe in detail the vacuum Vz, x-operation (“V” stems from “vacuum”, {z, x} imply the corresponding coordinates) that transforms the given Green functions to the corresponding vacuum integrations which generate
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Rheology of a dilute binary mixture of inertial suspension under simple shear flow Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2023-10-04 Satoshi Takada, Hisao Hayakawa, Vicente Garzó
The rheology of a dilute binary mixture of inertial suspension under simple shear flow is analyzed in the context of the Boltzmann kinetic equation. The effect of the surrounding viscous gas on the solid particles is accounted for by means of a deterministic viscous drag force plus a stochastic Langevin-like term defined in terms of the environmental temperature Tenv. Grad’s moment method is employed
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QED on the lattice and numerical perturbative computation of g − 2 Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2023-10-04 Ryuichiro Kitano, Hiromasa Takaura
We compute the electron g factor to the $\mathcal {O}(\alpha ^5)$ order on the lattice in quenched QED. We first study finite volume corrections in various IR regularization methods to discuss which regularization is optimal for our purpose. We find that in QEDL the finite volume correction to the effective mass can have different parametric dependences depending on the size of Euclidean time t and
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On the spectrum around numerical solutions in siegel gauge in open string field theory Prog. Theor. Exp. Phys. (IF 3.5) Pub Date : 2023-09-28 Isao Kishimoto
In bosonic open string field theory, the spectrum around the numerical tachyon vacuum solution in Siegel gauge was investigated by Giusto and Imbimbo. Using their numerical method, we study the mass spectrum around two other solutions, which are “double brane” and “single brane” solutions in Siegel gauge constructed by the level truncation approximation. The “double brane” solution was constructed