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SU(5)L × U(1)Y electroweak unification Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210917
Adrian PalcuWe propose here  for the first time in the literature, to our best knowledge  an electroweak unification based on the SU(5)L × U(1)Y gauge group. The spontaneous symmetry breaking takes place in the manner SU(5)L × U(1)Y → U(1)em, due to a particular Higgs sector consisting of five scalar quintuplets. Each scalar quintuplet acquires its own vacuum expectation value, by means of a proper parametrization

Gradient flow and the Wilsonian renormalization group flow Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210907
Hiroki Makino, Okuto Morikawa, Hiroshi SuzukiIn our original paper, Figs. 1 and 2 are incorrect due to a mistake in the numerical code and should be replaced by the following ones. We would like to thank Mizuki Tanaka and Masakiyo Kitazawa for pointing this out to us.

Divergence equations and uniqueness theorem of static spacetimes with conformal scalar hair Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210820
Shinohara T, Tomikawa Y, Izumi K, et al.AbstractWe reexamine the Israeltype proof of the uniqueness theorem of the static spacetime outside the photon surface in the Einsteinconformal scalar system. We derive in a systematic fashion a new divergence identity which plays a key role in the proof. Our divergence identity includes three parameters, allowing us to give a new proof of the uniqueness.

Search for $\alpha$ condensed states in $^{13}$C using $\alpha$ inelastic scattering Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210811
K Inaba, Y Sasamoto, T Kawabata, M Fujiwara, Y Funaki, K Hatanaka, K Itoh, M Itoh, K Kawase, H Matsubara, Y Maeda, K Suda, S Sakaguchi, Y Shimizu, A Tamii, Y Tameshige, M Uchida, T Uesaka, T Yamada, H P YoshidaWe searched for the $\alpha$ condensed state in $^{13}$C by measuring the $\alpha$ inelastic scattering at $E_\alpha = 388$ MeV at forward angles including 0$^\circ$. We performed a distortedwave Born approximation calculation with the singlefolding potential and multipole decomposition analysis to determine the isoscalar transition strengths in $^{13}$C. We found a bump structure around

Type II superstring field theory revisited Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210806
Kunitomo H.AbstractWe reconstruct a complete type II superstring field theory with $L_\infty$ structure in a symmetric way concerning the left and rightmoving sectors. Based on the new construction, we show again that the treelevel Smatrix agrees with that obtained using the firstquantization method. Not only is this a simple and elegant reconstruction, but it also enables the action to be mapped to that

Neutron star cooling in modified gravity theories Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210729
Dohi A, Kase R, Kimura R, et al.AbstractWe study the thermal evolution of isolated neutron stars in scalar–tensor theories for the first time. Whether rapid cooling due to the direct Urca process occurs or not is an interesting question from the viewpoint of the temperature observation of isolated neutron stars. Moreover, investigation of the cooling effect of nucleon superfluidity also has large uncertainties, though it is important

Weighting gates in circuit complexity and holography Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210729
I AkalMotivated by recent studies of quantum computational complexity in quantum field theory and holography, we discuss how weighting certain classes of gates building up a quantum circuit more heavily than others affects the complexity. Utilizing Nielsen’s geometric approach to circuit complexity, we investigate the effects for a regulated field theory for which the optimal circuit is a representation

The UV sensitivity of the Higgs potential in Gauge–Higgs Unification Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210714
Atsuyuki YamadaIn this paper, we discuss the UV sensitivity of the Higgs effective potential in a GaugeHiggs Unification (GHU) model. We consider an $SU(\mathcal N)$ GHU on $\mathbf M^4\times S^1$ spacetime with a massless Dirac fermion. In this model, we evaluate the fourFermi diagrams at the twoloop level and find them to be logarithmically divergent in the dimensional regularization scheme. Moreover, we

A comment on the averaging in an inhomogeneous cosmology and the Hubble constant problem Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210916
Masanori Tomonaga, Toshifumi FutamaseIn recent cosmology, the Hubble constant problem has attracted much attention. As a possible solution to the problem, the local variation of the expansion rate in an inhomogeneous cosmology has been proposed where the spatial averaging over a finite domain was introduced in order to construct local Friedmann spacetime. However the treatment was restricted in comoving synchronous gauge ad there is some

Correspondence between isoscalar monopole strengths and α inelastic cross sections on 24Mg Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210913
Ogata K, Chiba Y, Sakuragi Y.AbstractThe correspondence between the isoscalar monopole (IS0) transition strengths and α inelastic cross sections, the B(IS0)(α,α′) correspondence, is investigated for 24Mg(α,α′) at 130 and 386 MeV. We adopt a microscopic coupledchannel reaction framework to link structural inputs, diagonal and transition densities, for 24Mg obtained with antisymmetrized molecular dynamics to the (α,α′) cross sections

Quantum noise and vacuum fluctuations in balanced homodyne detections through ideal multimode detectors Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210906
Nakamura K.AbstractThe balanced homodyne detection as a readout scheme of gravitationalwave detectors is carefully examined from the quantum field theoretical point of view. The readout scheme in gravitationalwave detectors specifies the directly measured quantum operator in the detection. This specification is necessary when we apply the recently developed quantum measurement theory to gravitationalwave detections

Center group dominance in quark confinement Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210906
Ryu Ikeda, KeiIchi KondoWe show that the color N dependent area law falloffs of the doublewinding Wilson loop averages for the SU(N) lattice gauge theory obtained in the preceding works are reproduced from the corresponding lattice Abelian gauge theory with the center gauge group ZN. This result indicates the center group dominance in quark confinement.

Higher dimensional inhomogeneous composite fluids: energy conditions Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210904
Byron P Brassel, Sunil D Maharaj, Rituparno GoswamiThe energy conditions are studied, in the relativistic astrophysical setting, for higher dimensional HawkingEllis Type I and Type II matter fields. The null, weak, dominant and strong energy conditions are investigated for a higher dimensional inhomogeneous, composite fluid distribution consisting of anisotropy, shear stresses, nonvanishing viscosity as well as a null dust and null string energy density

Ξ hypernuclear states predicted by NLO chiral baryonbaryon interactions Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210904
M Kohno, K MiyagawaThe Ξ singleparticle potential obtained in nuclear matter with the nexttoleading order baryonbaryon interactions in chiral effective field theory is applied to finite nuclei by an improved localdensity approximation method. As a premise, phase shifts of ΞN elastic scattering and the results of Faddeev calculations for the ΞNN bound state problem are presented to show the properties of the ΞN interactions

Pb/Bi heterostructure as a versatile platform to realize topological superconductivity Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210904
Ikuko Watanabe, Seigo Souma, Kosuke Nakayama, Katsuaki Sugawara, Chi Xuan Trang, Kouji Segawa, Kunihiko Yamauchi, Tamio Oguchi, Takashi Takahashi, Takafumi SatoRealization of topological superconductors (TSCs) hosting Majorana fermions is an exciting challenge in materials science. Majorana fermions are predicted to emerge at vortex cores of twodimensional (2D) TSCs and at both ends of onedimensional (1D) TSCs; these two types of TSCs have been explored independently in different materials. Here, a system which has a potential to access both 1D and 2D TSCs

Enforced stripping of negative muons from μHe+ ions to stimulate muoncatalyzed fusion by cyclotron resonance acceleration Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210824
Yoshiharu MoriSticking of a negative muon to an α particle to form a μHe+ ion limits the number of chain reactions in muon catalyzed fusion(MuCF), making the scientific breakeven in MuCF difficult. The reduction in the sticking probability by boosting the negative muon stripping using resonance rf acceleration of μHe+ ions has been examined with multiparticle tracking simulations. It was found that the stripping

Fermionic Topological Phases and bosonization in higher dimensions Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210820
Ryohei KobayashiIn this article, we review a recipe to produce a lattice construction of fermionic phases of matter in the presence of the time reversal symmetry, by extending the fermionization and bosonization known in (1 + 1) dimensions to various setups including higher spacetime dimensions in the presence of global symmetries. As an application, we provide a state sum lattice path integral for (1 + 1)dimensional

Resolving the Hubble tension in a U(1)Lμ – Lτ model with Majoron Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210820
Takeshi Araki, Kento Asai, Kei Honda, Ryuta Kasuya, Joe Sato, Takashi Shimomura, Masaki J S YangIn this paper, we explore possibilities of resolving the Hubble tension and (g  2)μ anomaly simultaneously in a U(1)LμLτ model with Majoron. We only focus on a case where the Majoron ϕ does not exist at the beginning of the universe and is created by neutrino inverse decay νν → ϕ after electronpositron annihilation. In this case, contributions of the new gauge boson Z′ and Majoron ϕ to the effective

Vertex operator superalgebra/sigma model correspondences: The fourtorus case Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210816
Vassilis Anagiannis, Miranda C N Cheng, John Duncan, Roberto VolpatoWe propose a correspondence between vertex operator superalgebras and families of sigma models in which the two structures are related by symmetry properties and a certain reflection procedure. The existence of such a correspondence is motivated by previous work on ${\cal N}=(4,4)$ supersymmetric nonlinear sigma models on K3 surfaces, and on a vertex operator superalgebra with Conway group symmetry

Properties of Skyrme force as a residual interaction in beyondmeanfield theories Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210714
Tohyama M.AbstractIn an effort to find an effective interaction that can consistently be used for both the meanfield part and the residual part in beyondmeanfield theories, the properties of the Skyrme interactions as a residual interaction are investigated. The timedependent densitymatrix theory (TDDM) is used as a beyondmeanfield theory and the ground states of $^{16}$O and $^{40}$Ca are calculated

Development of convolutional neural networks for an electrontracking Compton camera Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210714
Ikeda T, Takada A, Abe M, et al.AbstractThe ElectronTracking Compton Camera (ETCC), which is a complete Compton camera that tracks Compton scattering electrons with a gas micro time projection chamber, is expected to open up MeV gammaray astronomy. The technical challenge for achieving several degrees of the pointspread function is precise determination of the electron recoil direction and the scattering position from track images

Fermion masses and mixings in a U(1)X model based on the Σ(18) discrete symmetry Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210714
Vien V, Hernández A, Long H.AbstractWe have built a renormalizable $U(1)_X$ model with a $\Sigma (18)\times Z_4$ symmetry, whose spontaneous breaking yields the observed standard model (SM) fermion masses and fermionic mixing parameters. The tiny masses of the light active neutrinos are produced by the type I seesaw mechanism mediated by very heavy righthanded Majorana neutrinos. To the best of our knowledge, this model is the

Recent Developments of Mathematical Methods in Theoretical Particle Physics – In memory of Tohru Eguchi – Part II Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210708
Yoneya T.This special section is dedicated to the memory of the late Professor Tohru Eguchi. Professor Eguchi passed away on 30 January 2019. His early passing before finishing his term as EditorinChief of PTEP was a great loss not only for PTEP, but also much more so for researchers working in the various fields where he made a lasting mark with his many contributions. The Editorial Board of PTEP decided

Oneloop W boson contributions to the decay H → Zγ in the general Rξ gauge Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210811
Phan K, Hue L, Tran D.AbstractOneloop W boson contributions to the decay H → Zγ in the general Rξ gauge are presented. The analytical results are expressed in terms of wellknown PassarinoVeltman functions which their numerical evaluations can be generated using LoopTools. In the limit d → 4, we have shown that these analytical results are independent of the unphysical parameter ξ and consistent with previous results

KBc algebra and the gauge invariant overlap in open string field theory Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210811
E Aldo ArroyoWe study in detail the evaluation of the gauge invariant overlap for analytic solutions constructed out of elements in the KBc algebra in open string field theory. We compute this gauge invariant observable using analytical and numerical techniques based on the sliver frame ℒ0 and traditional Virasoro L0 level expansions of the solutions.

Muon spin motion at the crossover regime between Gaussian and Lorentzian distribution of magnetic fields Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210802
Muhamad Darwis Umar, Katsuhiko Ishida, Rie Murayama, Dita Puspita Sari, Utami Widyaiswari, Marco Fronzi, Harion Rozak, Wan Nurfadhilah Zaharim, Isao Watanabe, Masahiko IwasakiThe muon spin relaxation method is a powerful microscopic tool for probing the electronic states of materials by observing local magnetic field distributions on the muon. It often happens that a distribution of local magnetic fields shows an intermediate state between Gaussian and Lorentzian shapes. In order to generally describe these intermediate field distributions, we considered the convolution

Backreaction of Mass and Angular Momentum Accretion on Black Holes: General Formulation of the Metric Perturbations and Application to the BlandfordZnajek Process Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210803
Masashi Kimura, Tomohiro Harada, Atsushi Naruko, Kenji TomaWe study the metric backreaction of mass and angular momentum accretion on black holes. We first develop the formalism of monopole and dipole linear gravitational perturbations around the Schwarzschild black holes in the EddingtonFinkelstein coordinates against the generic timedependent matters. We derive the relation between the time dependence of the mass and angular momentum of the black hole

Gradient flow exact renormalization group—inclusion of fermion fields Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210803
Yuki Miyakawa, Hiroshi SuzukiThe gradient flow exact renormalization group (GFERG) is an exact renormalization group motivated by the Yang–Mills gradient flow and its salient feature is a manifest gauge invariance. We generalize this GFERG, originally formulated for the pure Yang–Mills theory, to vectorlike gauge theories containing fermion fields keeping the manifest gauge invariance. For the chiral symmetry, we have two options:

Exact solution for wave scattering from black holes: Formulation Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210729
Motohashi H, Noda S.AbstractWe establish an exact formulation for wave scattering of a massless field with spin and charge by KerrNewmande Sitter black hole. Our formulation is based on the exact solution of the Teukolsky equation in terms of the local Heun function, and does not require any approximation. It serves simple exact formulae with arbitrary high precision, which realize fast calculation without restrictions

Twoloop scalar functions with I internal lines, I ≤ 5 Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210729
J Ph Guillet, E Pilon, Y Shimizu, M S ZidiThis article displays a proof of concept of the mixed analytical/numerical method, presented in previous publications, to compute twoloop functions with up to five massive propagators in a scalar theory having three and fourleg vertices as the Higgs sector of the Standard Model. Several amplitudes are considered with two, three and four external legs. Some of them diverge in the UV region and we

Search for tens of MeV neutrinos associated with gammaray bursts in SuperKamiokande Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210727
Orii A, Abe K, Bronner C, et al.AbstractA search for neutrinos produced in coincidence with gammaray bursts (GRBs) was conducted with the SuperKamiokande (SK) detector. Between December 2008 and March 2017, the Gammaray Coordinates Network recorded 2208 GRBs that occurred during normal SK operation. Several time windows around each GRB were used to search for coincident neutrino events. No statistically significant signal in excess

’t Hooft expansion of multiboundary correlators in 2d topological gravity Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210714
Kazumi Okuyama, Kazuhiro SakaiWe study multiboundary correlators of WittenKontsevich topological gravity in two dimensions. We present a method of computing an open string like expansion, which we call the ’t Hooft expansion, of the nboundary correlator for any n up to any order by directly solving the KdV equation. We first explain how to compute the ’t Hooft expansion of the oneboundary correlator. The algorithm is very similar

Area bound for surfaces in generic gravitational field Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210714
Keisuke Izumi, Yoshimune Tomikawa, Tetsuya Shiromizu, Hirotaka YoshinoWe define an attractive gravity probe surface (AGPS) as a compact 2surface Sα with positive mean curvature k satisfying raDak∕k2 ≥ α (for a constant α > 1∕2) in the local inverse mean curvature flow, where raDak is the derivative of k in the outward unit normal direction. For asymptotically flat spaces, any AGPS is proved to satisfy the areal inequality Aα ≤ 4π[(3 + 4α)∕(1 + 2α)]2(Gm)2, where Aα

Deformation effect on nuclear density profile and radius enhancement in light and mediummass neutronrich nuclei Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210714
Wataru Horiuchi, Tsunenori InakuraMass number dependence of the nuclear radii is closely related to the nuclear matter properties. It is known that the most of nuclei exhibit some deformation. We discuss how the nuclear density profile is modified by the nuclear deformation to elucidate the enhancement mechanism of the nuclear radii through a systematic investigation of neutronrich Ne, Mg, Si, S, Ar, Ti, Cr, and Fe isotopes. SkyrmeHartreeFock

Quantum phase transition and Resurgence: Lessons from 3d N = 4 SQED Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210714
Fujimori T, Honda M, Kamata S, et al.AbstractWe study a resurgence structure of a quantum field theory with a phase transition to uncover relations between resurgence and phase transitions. In particular, we focus on threedimensional N = 4 supersymmetric quantum electrodynamics (SQED) with multiple hypermultiplets, where a secondorder quantum phase transition has been recently proposed in the largeflavor limit. We provide interpretations

First observation of a nuclear sstate of a $\Xi$ hypernucleus, $^{15}_{\Xi}{\rm C}$ Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210722
M Yoshimoto, J K Ahn, B Bassalleck, H Ekawa, Y Endo, M Fujita, Y Han, T Hashimoto, S H Hayakawa, K Hicks, K Hoshino, S Hoshino, S H Hwang, Y Ichikawa, M Ichikawa, K Imai, Y Ishikawa, H Kanauchi, A Kasagi, S H Kim, S Kinbara, P M Lin, T L Ma, K Miwa, A T Moe, Y Nagase, K Nakazawa, T Nanamura, M Naruki, A N L Nyaw, J Pochodzalla, H Sako, S Sato, M M Soe, M K Soe, J Y Sohn, H Takahashi, T Takahashi, HBound systems of $\Xi^$–$^{14}_{}{\rm N}$ are studied via $\Xi^$ capture at rest followed by emission of a twin single$\Lambda$ hypernucleus in the emulsion detectors. Two events forming extremely deep $\Xi^$ bound states were obtained by analysis of a hybrid method in the E07 experiment at JPARC and reanalysis of the E373 experiment at KEKPS. The decay mode of one event was assigned

The Atiyah–Patodi–Singer index theorem from the axial anomaly Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210628
Kobayashi S, Yonekura K.AbstractWe give a very simple derivation of the Atiyah–Patodi–Singer (APS) index theorem and its small generalization by using the path integral of massless Dirac fermions. It is based on Fujikawa’s argument for the relation between the axial anomaly and the Atiyah–Singer index theorem, and only a minor modification of that argument is sufficient to show the APS index theorem. The key ingredient is

Revisiting nonGaussianity in nonattractor inflation models in the light of the cosmological soft theorem Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210521
Teruaki Suyama, Yuichiro Tada, Masahide YamaguchiWe revisit squeezedlimit nonGaussianity in singlefield nonattractor inflation models from the viewpoint of the cosmological soft theorem. In singlefield attractor models, an inflaton’s trajectories with different initial conditions effectively converge into a single trajectory in the phase space, and hence there is only one clock degree of freedom (DoF) in the scalar part. Its longwavelength

Response of laboratory plasma influenced by a feedback loop to external force Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210622
Takao Fukuyama, Masahiro OmotoThis study experimentally examines the sensitivity of laboratory plasma influenced by a feedback loop to applied external force, with the objective of gaining insight into chaos control in plasma. The ionization waves in laboratory plasma are adopted as the medium of a typical nonlinear system. In the case of a system without the influence of feedback (defined as system A), the orbit of the chaotic

Microstructure and continuous phase transition of a regular Hayward black hole in antide Sitter spacetime Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210521
Naveena Kumara A, Ahmed Rizwan C, Hegde K, et al.AbstractIn this article we study the thermodynamic phase transition of a regular HaywardAdS black hole, by introducing a new order parameter, which is the potential conjugate to the magnetic charge arising from a nonlinearly coupled electromagnetic field. We use Landau continuous phase transition theory to discuss the van der Waalslike critical phenomena of the black hole. The wellknown interpretation

A backlinked Fabry–Pérot interferometer for spaceborne gravitational wave observations Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210521
Kiwamu Izumi, MasaKatsu FujimotoDirect observations of gravitational waves at frequencies below 10 Hz will play a crucial role in fully exploiting the potential of gravitational wave astronomy. One approach to pursue this direction is the utilization of laser interferometers equipped with Fabry–Pérot optical cavities in space. However, there are a number of practical challenges in following this path. In particular, the implementation

Role of UA(1) breaking term in dynamical chiral symmetry breaking of chiral effective theories Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210629
Kono S, Jido D, Kuroda Y, et al.AbstractThe spontaneous breaking of chiral symmetry is examined by chiral effective theories, such as the linear σ model and the Nambu–JonaLasinio (NJL) model. We discuss the properties of the sigma meson regarded as the quantum fluctuation of the chiral condensate when the chiral symmetry is spontaneously broken mainly by the UA(1) anomaly. We derive a mass relation among the SU(3) flavor singlet

Contribution of heavy neutrinos to decay of standardmodellike Higgs boson h → μτ in a 331 model with additional gauge singlets Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210629
H T Hung, N T Tham, T T Hieu, N T T HangIn the framework of the improved version of the 331 models with righthanded neutrinos, which is added to the Majorana neutrinos as new gauge singlets, the recent experimental neutrino oscillation data is completely explained through the inverse seesaw mechanism. We show that the major contributions to Br(μ → eγ) are derived from corrections at 1loop order of heavy neutrinos and bosons. But, these

Exploring the role of new physics in b → uτν̄ decays Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210629
Aishwarya Bhatta, Atasi Ray, Rukmani MohantaThe recent measurements on RD, RD* and RJ∕ψ by three pioneering experiments, BaBar, Belle and LHCb, indicate that the notion of lepton flavour universality is violated in the weak chargedcurrent processes, mediated through b → cℓν̄ℓ transitions. These intriguing results, which delineate a tension with their standard model predictions at the level of (23)σ have triggered many new physics propositions

Oscillating 4Polytopal Universe in Regge Calculus Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210629
Ren Tsuda, Takanori FujiwaraThe discretized closed FriedmannLemaîtreRobertsonWalker (FLRW) universe with positive cosmological constant is investigated by Regge calculus. According to the CollinsWilliams formalism, a hyperspherical Cauchy surface is replaced with regular 4polytopes. Numerical solutions to the Regge equations approximate well to the continuum solution during the era of small edge length. Unlike the expanding

Influence of dwave superconductor orientation on Josephson current and phase difference in junctions with inhomogeneous ferromagnet Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210629
Stevan Djurdjević, Zorica PopovićUtilizing a microscopic Bogoliubovde Gennes approach we study Josephson effect in arbitrarily oriented dwave superconductors connected through two ferromagnets with noncollinear magnetizations, by solving scattering problem. The critical Josephson current is calculated for various parameters of the junction. Mutual influence of dwave superconducting electrodes orientation and angle α between magnetization

Pion mass dependence of the electromagnetic form factors of singly heavy baryons Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210610
JuneYoung Kim, HyunChul KimWe study the electromagnetic form factors of the lowestlying singly heavy baryons with spin 1/2 within the framework of the chiral quark–soliton model, focusing on the comparison with recent lattice data. To compare the present results quantitatively with the lattice data, it is essential to treat the pion mass as a variable parameter, i.e., to employ unphysical values of the pion mass, which are

Generalization of Hamiltonian mechanics to a threedimensional phase space Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210521
Naoki SatoClassical Hamiltonian mechanics is realized by the action of a Poisson bracket on a Hamiltonian function. The Hamiltonian function is a constant of motion (the energy) of the system. The properties of the Poisson bracket are encapsulated in the symplectic $2$form, a closed secondorder differential form. Due to closure, the symplectic $2$form is preserved by the Hamiltonian flow, and it assigns

IIB matrix model and regularized big bang Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210521
F R KlinkhamerThe largeN master field of the Lorentzian IIB matrix model can, in principle, give rise to a particular degenerate metric relevant to a regularized big bang. The length parameter of this degenerate metric is then calculated in terms of the IIBmatrixmodel length scale.

What if a specific neutrinoless double beta decay is absent? Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210512
Takehiko Asaka, Hiroyuki Ishida, Kazuki TanakaWe consider the seesaw model with two righthanded neutrinos, $N_1$ and $N_2$, the masses of which are hierarchical, and investigate their contribution to the neutrinoless double beta ($0 \nu \beta \beta$) decay. Although the lepton number is broken by the Majorana masses of righthanded neutrinos, such decay processes can be absent in some cases. We present a possibility where the lighter

Role of the unitary correlation operator on highmomentum antisymmetrized molecular dynamics using the bare NN interaction for 3H and 4He Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210512
Qing Zhao, Masahiro Isaka, Takayuki Myo, Mengjiao Lyu, Hiroshi Toki, Hisashi Horiuchi, Hiroki Takemoto, Niu WanWe extend highmomentum antisymmetrized molecular dynamics (HMAMD) by incorporating the shortrange part of the unitary correlation operator method (UCOM) as the variational method of finite nuclei. In this HMAMD+UCOM calculation of light nuclei, HMAMD is mainly in charge of the tensor correlation with up to fourbody correlation, while the shortrange correlation is further improved by using UCOM

Can a CNN trained on the Ising model detect the phase transition of the qstate Potts model? Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210506
Fukushima K, Sakai K.AbstractEmploying a deep convolutional neural network (deep CNN) trained on spin configurations of the 2D Ising model and the temperatures, we examine whether the deep CNN can detect the phase transition of the 2D $q$state Potts model. To this end, we generate binarized images of spin configurations of the $q$state Potts model ($q\ge 3$) by replacing the spin variables $\{0,1,\ldots,\lfloor q/2\rfloor1\}$

Development of a cavity with photonic crystal structure for axion searches Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210430
Y Kishimoto, Y Suzuki, I Ogawa, Y Mori, M YamashitaTwo cavities of different sizes with a photonic crystal structure have been developed for axion searches. In the cavities, the dispersion relation in the photonic crystal is utilized, and so they are called “DRiPC cavities”. The size of the smaller cavity is $100 \times 100 \times 10$ mm, where 16 cylindrical metal poles with a diameter of 4 mm are introduced in a $4\times4$ grid at 20 mm intervals

Directionsensitive dark matter search with the lowbackground gaseous detector NEWAGE0.3b” Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210429
Tomonori Ikeda, Kiseki Nakamura, Takuya Shimada, Ryota Yakabe, Takashi Hashimoto, Hirohisa Ishiura, Takuma Nakamura, Hiroshi Ito, Koichi Ichimura, Ko Abe, Kazuyoshi Kobayashi, Toru Tanimori, Hidetoshi Kubo, Atsushi Takada, Hiroyuki Sekiya, Atsushi Takeda, Kentaro MiuchiNEWAGE is a directionsensitive dark matter search using a lowpressure gaseous time projection chamber. A low alpharay emission rate micro pixel chamber had been developed in order to reduce background for dark matter search. We conducted the dark matter search at the Kamioka Observatory in 2018. The total live time was 107.6 d, corresponding to an exposure of 1.1 kg$\>$d. Two events remained in

Slow control and monitoring system at the JSNS2 Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210421
Park J, Ajimura S, Botran M, et al.AbstractThe Sterile Neutrino Search at the JPARC Spallation Neutron Source (JSNS$^2$) experiment aims to search for sterile neutrino oscillations using a neutrino beam from muon decays at rest. The JSNS$^2$ detector contains 17 tons of 0.1$\%$ gadolinium (Gd) loaded liquid scintillator (LS) as a neutrino target. Detector construction was completed in the spring of 2020. A slow control and monitoring

Black hole evolution in a quantumgravitational framework Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210421
I Y ParkWe investigated black hole evolution on a quantumgravitational scattering framework with the aim of tackling the black hole information paradox. With this setup, various pieces of system information are explicit from the start and unitary evolution is manifest throughout. The scattering amplitudes factorize into a perturbative part and a nonperturbative part. The nonperturbative part is dominated

Nambu dynamics and its noncanonical Hamiltonian representation in many degrees of freedom systems Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210614
Horikoshi A.AbstractNambu dynamics is a generalized Hamiltonian dynamics of more than two variables, whose time evolutions are given by the Nambu bracket, a generalization of the canonical Poisson bracket. Nambu dynamics can always be represented in the form of noncanonical Hamiltonian dynamics by defining the noncanonical Poisson bracket by means of the Nambu bracket. For the time evolution to be consistent,

Wilson’t Hooft Line Operators as Transfer Matrices Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210610
Kazunobu MaruyoshiWe review the relation between halfBPS Wilson’t Hooft line operators in N = 2 supersymmetric gauge theories on the twisted spacetime S1 ×ϵ ℝ2 × ℝ and the transfer matrices constructed from the trigonometric Loperators of an integrable system.

Coupled macrospin model with two variables for polarity reversals in the Earth and the Sun Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210607
Ariyoshi Kunitomo, Akika Nakamichi, Tetsuya HaraGeomagnetism is extremely complex and the straightforward magnetohydrodynamics (MHD) simulations are still unable to reveal the whole dynamics of it. Recently, a simple macrospin model for geomagnetism has been suggested. This model is based on the idea that the whole geomagnetism is described by interactions with many local dynamo elements (macrospins). This model can reproduce some complex features

Bound states of the Yukawa potential from hidden supersymmetry Prog. Theor. Exp. Phys. (IF 2.572) Pub Date : 20210604
M Napsuciale, S RodríguezIn this work, we present a phenomenological study of the complete analytical solution to the bound eigenstates and eigenvalues of the Yukawa potential obtained previously using the hidden supersymmetry of the system and a systematic expansion of the Yukawa potential in terms of δ = a 0 ∕D, where a 0 is the Bohr radius and D is the screening length. The eigenvalues, ϵnl(δ), are given in the form of