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  • Long-range magnetic order in the ${\tilde S}=1/2$ triangular lattice antiferromagnet KCeS$_2$
    SciPost Phys. (IF 5.051) Pub Date : 2020-09-17
    Gaël Bastien; Bastian Rubrecht; Ellen Häußler; Philipp Schlender; Ziba Zangeneh; Stanislav Avdoshenko; Rajib Sarkar; Alexey Alfonsov; Sven Luther; Yevhen A. Onykiienko; Helen C. Walker; Hannes Kühne; Vadim Grinenko; Zurab Guguchia; Vladislav Kataev; Hans-Henning Klauss; Liviu Hozoi; Jeroen van den Brink; Dmytro S. Inosov; Bernd Büchner; Anja Wolter-Giraud; Thomas Doert

    Recently, several putative quantum spin liquid (QSL) states were discovered in ${\tilde S} = 1/2$ rare-earth based triangular-lattice antiferromagnets (TLAF) with the delafossite structure. A way to clarify the origin of the QSL state in these systems is to identify ways to tune them from the putative QSL state towards long-range magnetic order. Here, we introduce the Ce-based TLAF KCeS$_2$ and show

    更新日期:2020-09-18
  • Collision rate ansatz for quantum integrable systems
    SciPost Phys. (IF 5.051) Pub Date : 2020-09-15
    Takato Yoshimura; Herbert Spohn

    For quantum integrable systems the currents averaged with respect to a generalized Gibbs ensemble are revisited. An exact formula is known, which we call “collision rate ansatz”.While there is considerable work to confirm this ansatz in various models, our approach uses the symmetry of the current-charge susceptibility matrix, which holds in great generality. Besides some technical assumptions, the

    更新日期:2020-09-15
  • Integrable matrix models in discrete space-time
    SciPost Phys. (IF 5.051) Pub Date : 2020-09-14
    Žiga Krajnik; Enej Ilievski; Tomaz Prosen

    We introduce a class of integrable dynamical systems of interacting classical matrix-valued fields propagating on a discrete space-time lattice, realized as many-body circuits built from elementary symplectic two-body maps. The models provide an efficient integrable Trotterization of non-relativistic $\sigma$-models with complex Grassmannian manifolds as target spaces, including, as special cases,

    更新日期:2020-09-14
  • Higher spin partition functions via the quasinormal mode method in de Sitter quantum gravity
    SciPost Phys. (IF 5.051) Pub Date : 2020-09-14
    Victoria Martin; Andrew Svesko

    In this note we compute the 1-loop partition function of spin-$s$ fields on Euclidean de Sitter space $S^{2n+1}$ using the quasinormal mode method. Instead of computing the quasinormal mode frequencies from scratch, we use the analytic continuation prescription $L_{\text{AdS}}\to iL_{\text{dS}}$, appearing in the dS/CFT correspondence, and Wick rotate the normal mode frequencies of fields on thermal

    更新日期:2020-09-14
  • Cosmic censorship of trans-Planckian field ranges in gravitational collapse
    SciPost Phys. (IF 5.051) Pub Date : 2020-09-11
    Himanshu Chaudhary; Chethan Krishnan

    A classical solution where the (scalar) field value moves by an ${\cal O}(1)$ range in Planck units is believed to signal the breakdown of Effective Field Theory (EFT). One heuristic argument for this is that such a field will have enough energy to be inside its own Schwarzschild radius, and will result in collapse. In this paper, we consider an inverse problem: what kind of field ranges arise during

    更新日期:2020-09-11
  • Emergence of generalized hydrodynamics in the non-local Luttinger model
    SciPost Phys. (IF 5.051) Pub Date : 2020-09-11
    Per Moosavi

    We propose the Luttinger model with finite-range interactions as a simple tractable example in 1+1 dimensions to analytically study the emergence of Euler-scale hydrodynamics in a quantum many-body system. This non-local Luttinger model is an exactly solvable quantum field theory somewhere between conformal and Bethe-ansatz integrable models. Applying the recent proposal of generalized hydrodynamics

    更新日期:2020-09-11
  • Analytic and numerical bootstrap of CFTs with $O(m)\times O(n)$ global symmetry in 3D
    SciPost Phys. (IF 5.051) Pub Date : 2020-09-10
    Johan Henriksson; Stefanos R. Kousvos; Andreas Stergiou

    Motivated by applications to critical phenomena and open theoretical questions, we study conformal field theories with $O(m)\times O(n)$ global symmetry in $d=3$ spacetime dimensions. We use both analytic and numerical bootstrap techniques. Using the analytic bootstrap, we calculate anomalous dimensions and OPE coefficients as power series in $\varepsilon=4-d$ and in $1/n$, with a method that generalizes

    更新日期:2020-09-10
  • Heavy operators and hydrodynamic tails
    SciPost Phys. (IF 5.051) Pub Date : 2020-09-08
    Luca Delacrétaz

    The late time physics of interacting QFTs at finite temperature is controlled by hydrodynamics. For CFTs this implies that heavy operators -- which are generically expected to create thermal states -- can be studied semiclassically. We show that hydrodynamics universally fixes the OPE coefficients $C_{HH'L}$, on average, of all neutral light operators with two non-identical heavy ones, as a function

    更新日期:2020-09-09
  • Honeycomb rare-earth magnets with anisotropic exchange interactions
    SciPost Phys. (IF 5.051) Pub Date : 2020-09-04
    Zhu-Xi Luo; Gang Chen

    We study the rare-earth magnets on a honeycomb lattice, and are particularly interested in the experimental consequences of the highly anisotropic spin interaction due to the spin-orbit entanglement. We perform a high-temperature series expansion using a generic nearest-neighbor Hamiltonian with anisotropic interactions, and obtain the heat capacity, the parallel and perpendicular spin susceptibilities

    更新日期:2020-09-05
  • Finite temperature and quench dynamics in the Transverse Field Ising Model from form factor expansions
    SciPost Phys. (IF 5.051) Pub Date : 2020-09-04
    Etienne Granet; Maurizio Fagotti; Fabian Essler

    We consider the problems of calculating the dynamical order parameter two-point function at finite temperatures and the one-point function after a quantum quench in the transverse field Ising chain. Both of these can be expressed in terms of form factor sums in the basis of physical excitations of the model. We develop a general framework for carrying out these sums based on a decomposition of form

    更新日期:2020-09-05
  • Non-hermitian holography
    SciPost Phys. (IF 5.051) Pub Date : 2020-09-03
    Daniel Arean; Karl Landsteiner; Ignacio Salazar Landea

    Quantum theory can be formulated with certain non-Hermitian Hamiltonians. An anti-linear involution, denoted by PT, is a symmetry of such Hamiltonians. In the PT-symmetric regime the non-Hermitian Hamiltonian is related to a Hermitian one by a Hermitian similarity transformation. We extend the concept of non-Hermitian quantum theory to gauge-gravity duality. Non-Hermiticity is introduced via boundary

    更新日期:2020-09-03
  • Quantum quench dynamics in the transverse-field Ising model: A numerical expansion in linked rectangular clusters
    SciPost Phys. (IF 5.051) Pub Date : 2020-09-03
    Jonas Richter; Tjark Heitmann; Robin Steinigeweg

    We study quantum quenches in the transverse-field Ising model defined on different lattice geometries such as chains, two- and three-leg ladders, and two-dimensional square lattices. Starting from fully polarized initial states, we consider the dynamics of the transverse and the longitudinal magnetization for quenches to weak, strong, and critical values of the transverse field. To this end, we rely

    更新日期:2020-09-03
  • Sustaining a temperature difference
    SciPost Phys. (IF 5.051) Pub Date : 2020-09-02
    Matteo Polettini; Alberto Garilli

    We derive an expression for the minimal rate of entropy that sustains two reservoirs at different temperatures $T_0$ and $T_\ell$. The law displays an intuitive $\ell^{-1}$ dependency on the relative distance and a characterisic $\log^2 (T_\ell/T_0)$ dependency on the boundary temperatures. First we give a back-of-envelope argument based on the Fourier Law (FL) of conduction, showing that the least-dissipation

    更新日期:2020-09-02
  • Introduction to the nested algebraic Bethe ansatz
    SciPost Phys. (IF 5.051) Pub Date : 2020-09-02
    Nikita Slavnov

    We give a detailed description of the nested algebraic Bethe ansatz. We consider integrable models with a $\mathfrak{gl}_3$-invariant $R$-matrix as the basic example, however, we also describe possible generalizations. We give recursions and explicit formulas for the Bethe vectors. We also give a representation for the Bethe vectors in the form of a trace formula.

    更新日期:2020-09-02
  • An invitation to the principal series
    SciPost Phys. (IF 5.051) Pub Date : 2020-09-01
    Tarek Anous; Jim Skulte

    Scalar unitary representations of the isometry group of $d$-dimensional de Sitter space $SO(1,d)$ are labeled by their conformal weights $\Delta$. A salient feature of de Sitter space is that scalar fields with sufficiently large mass compared to the de Sitter scale $1/\ell$ have complex conformal weights, and physical modes of these fields fall into the unitary continuous principal series representation

    更新日期:2020-09-01
  • $\mathcal{I}$/$c$-extremization in M/F-duality
    SciPost Phys. (IF 5.051) Pub Date : 2020-09-01
    Marieke van Beest; Sebastjan Cizel; Sakura Schafer-Nameki; James Sparks

    We study the holographic dual to $c$-extremization for 2d $(0,2)$ superconformal field theories (SCFTs) that have an AdS$_3$ dual realized in Type IIB with varying axio-dilaton, i.e. F-theory. M/F-duality implies that such AdS$_3$ solutions can be mapped to AdS$_2$ solutions in M-theory, which are holographically dual to superconformal quantum mechanics (SCQM), obtained by dimensional reduction of

    更新日期:2020-09-01
  • QED at NNLO with McMule
    SciPost Phys. (IF 5.051) Pub Date : 2020-08-31
    Pulak Banerjee; Tim Engel; Adrian Signer; Yannick Ulrich

    McMule is a framework for fully differential higher-order QED calculations of scattering and decay processes involving leptons. It keeps finite lepton masses, which regularises collinear singularities. Soft singularities are treated with dimensional regularisation and using FKS$^\ell$ subtraction. We describe the implementation of the framework in Fortran 95, list the processes that are currently implemented

    更新日期:2020-08-31
  • Lecture notes on Generalised Hydrodynamics
    SciPost Phys. (IF 5.051) Pub Date : 2020-08-28
    Benjamin Doyon

    These are lecture notes for a series of lectures given at the Les Houches Summer School on Integrability in Atomic and Condensed Matter Physics, 30 July to 24 August 2018. The same series of lectures has also been given at the Tokyo Institute of Technology, October 2019. I overview in a pedagogical fashion the main aspects of the theory of generalised hydrodynamics, a hydrodynamic theory for quantum

    更新日期:2020-08-28
  • An optimal observable for color singlet identification
    SciPost Phys. (IF 5.051) Pub Date : 2020-08-26
    Andy Buckley; Giuseppe Callea; Andrew Larkoski; Simone Marzani

    We present a novel approach to construct a color tagger, i.e. an observable that is able to discriminate the decay of a color-singlet into two jets from a two-jet background in a different color configuration. We do this by explicitly taking the ratio of the corresponding leading-order matrix elements in the soft limit, thus obtaining an observable that is provably optimal within our approximation

    更新日期:2020-08-26
  • Asymmetric butterfly velocities in 2-local Hamiltonians
    SciPost Phys. (IF 5.051) Pub Date : 2020-08-25
    Yong-Liang Zhang; Vedika Khemani

    The speed of information propagation is finite in quantum systems with local interactions. In many such systems, local operators spread ballistically in time and can be characterized by a ``butterfly velocity", which can be measured via out-of-time-ordered correlation functions. In general, the butterfly velocity can depend asymmetrically on the direction of information propagation. In this work, we

    更新日期:2020-08-25
  • On the low-energy description for tunnel-coupled one-dimensional Bose gases
    SciPost Phys. (IF 5.051) Pub Date : 2020-08-25
    Yuri Daniel van Nieuwkerk; Fabian Essler

    We consider a model of two tunnel-coupled one-dimensional Bose gases with hard-wall boundary conditions. Bosonizing the model and retaining only the most relevant interactions leads to a decoupled theory consisting of a quantum sine-Gordon model and a free boson, describing respectively the antisymmetric and symmetric combinations of the phase fields. We go beyond this description by retaining the

    更新日期:2020-08-25
  • JT gravity at finite cutoff
    SciPost Phys. (IF 5.051) Pub Date : 2020-08-21
    Luca Iliesiu; Jorrit Kruthoff; Gustavo Turiaci; Herman Verlinde

    We compute the partition function of 2D Jackiw-Teitelboim (JT) gravity at finite cutoff in two ways: (i) via an exact evaluation of the Wheeler-DeWitt wavefunctional in radial quantization and (ii) through a direct computation of the Euclidean path integral. Both methods deal with Dirichlet boundary conditions for the metric and the dilaton. In the first approach, the radial wavefunctionals are found

    更新日期:2020-08-21
  • Reinterpretation of LHC Results for New Physics: Status and recommendations after Run 2
    SciPost Phys. (IF 5.051) Pub Date : 2020-08-21
    Waleed Abdallah; Shehu Abdus Salam; Azar Ahmadov; Amine Ahriche; Gaël Alguero; Ben Allanach; Jack Y. Araz; Alexandre Arbey; Chiara Arina; Peter Athron; Emanuele Angelo Bagnaschi; Yang Bai; Michael J. Baker; Csaba Balazs; Daniele Barducci; Philip Bechtle; Aoife Bharucha; Andy Buckley; Jonathan Butterworth; Haiying Cai; Claudio Campagnari; Cari Cesarotti; Marcin Chrzaszcz; Andrea Coccaro; Eric Conte;

    We report on the status of efforts to improve the reinterpretation of searches and measurements at the LHC in terms of models for new physics, in the context of the LHC Reinterpretation Forum. We detail current experimental offerings in direct searches for new particles, measurements, technical implementations and Open Data, and provide a set of recommendations for further improving the presentation

    更新日期:2020-08-21
  • Search for non-Abelian Majorana braiding statistics in superconductors
    SciPost Phys. (IF 5.051) Pub Date : 2020-08-04
    Carlo Beenakker

    This is a tutorial review of methods to braid the world lines of non-Abelian anyons (Majorana zero-modes) in topological superconductors. That "Holy Grail" of topological quantum information processing has not yet been reached in the laboratory, but there now exists a variety of platforms in which one can search for the Majorana braiding statistics. After an introduction to the basic concepts of braiding

    更新日期:2020-08-20
  • Topological holography: The example of the D2-D4 brane system
    SciPost Phys. (IF 5.051) Pub Date : 2020-08-05
    Nafiz Ishtiaque; Seyed Faroogh Moosavian; Yehao Zhou

    We propose a toy model for holographic duality. The model is constructed by embedding a stack of $N$ D2-branes and $K$ D4-branes (with one dimensional intersection) in a 6D topological string theory. The world-volume theory on the D2-branes (resp. D4-branes) is 2D BF theory (resp. 4D Chern-Simons theory) with $\mathrm{GL}_N$ (resp. $\mathrm{GL}_K$) gauge group. We propose that in the large $N$ limit

    更新日期:2020-08-20
  • Interacting edge states of fermionic symmetry-protected topological phases in two dimensions
    SciPost Phys. (IF 5.051) Pub Date : 2020-08-05
    Joseph Sullivan; Meng Cheng

    Recently, it has been found that there exist symmetry-protected topological phases of fermions, which have no realizations in non-interacting fermionic systems or bosonic models. We study the edge states of such an intrinsically interacting fermionic SPT phase in two spatial dimensions, protected by $\mathbb{Z}_4\times\mathbb{Z}_2^T$ symmetry. We model the edge Hilbert space by replacing the internal

    更新日期:2020-08-20
  • Non-boost invariant fluid dynamics
    SciPost Phys. (IF 5.051) Pub Date : 2020-08-11
    Jan de Boer; Jelle Hartong; Emil Have; Niels Obers; Watse Sybesma

    We consider uncharged fluids without any boost symmetry on an arbitrary curved background and classify all allowed transport coefficients up to first order in derivatives. We assume rota- tional symmetry and we use the entropy current formalism. The curved background geometry in the absence of boost symmetry is called absolute or Aristotelian spacetime. We present a closed-form expression for the energy-momentum

    更新日期:2020-08-20
  • Toward a 3d Ising model with a weakly-coupled string theory dual
    SciPost Phys. (IF 5.051) Pub Date : 2020-08-13
    Nabil Iqbal; John McGreevy

    It has long been expected that the 3d Ising model can be thought of as a string theory, where one interprets the domain walls that separate up spins from down spins as two-dimensional string worldsheets. The usual Ising Hamiltonian measures the area of these domain walls. This theory has string coupling of unit magnitude. We add new local terms to the Ising Hamiltonian that further weight each spin

    更新日期:2020-08-20
  • Statistical mechanics of integrable quantum spin systems
    SciPost Phys. (IF 5.051) Pub Date : 2020-08-17
    Frank Göhmann

    This script is based on the notes the author prepared to give a set of six lectures at the Les Houches School "Integrability in Atomic and Condensed Matter Physics" in the summer of 2018. The school had its focus on the application of integrability based methods to problems in non-equilibrium statistical mechanics. The lectures were meant to complement this subject with background material on the equilibrium

    更新日期:2020-08-20
  • Beyond Lee-Huang-Yang description of self-bound Bose mixtures
    SciPost Phys. (IF 5.051) Pub Date : 2020-08-18
    Miki Ota; Gregory Astrakharchik

    We investigate the properties of self-bound ultradilute Bose-Bose mixtures, beyond the Lee-Huang-Yang description. Our approach is based on the determination of the beyond mean-field corrections to the phonon modes of the mixture in a self-consistent way and calculation of the associated equation of state. The newly obtained ground state energies show excellent agreement with recent quantum Monte Carlo

    更新日期:2020-08-20
  • Quantum echo dynamics in the Sherrington-Kirkpatrick model
    SciPost Phys. (IF 5.051) Pub Date : 2020-08-19
    Silvia Pappalardi; Anatoli Polkovnikov; Alessandro Silva

    Understanding the footprints of chaos in quantum-many-body systems has been under debate for a long time. In this work, we study the echo dynamics of the Sherrington-Kirkpatrick (SK) model with transverse field under effective time reversal. We investigate numerically its quantum and semiclassical dynamics. We explore how chaotic many-body quantum physics can lead to exponential divergence of the echo

    更新日期:2020-08-20
  • Lyapunov exponents and entanglement entropy transition on the noncommutative hyperbolic plane
    SciPost Phys. (IF 5.051) Pub Date : 2020-08-20
    Sriram Ganeshan; Alexios P. Polychronakos

    We study quantum dynamics on noncommutative spaces of negative curvature, focusing on the hyperbolic plane with spatial noncommutativity in the presence of a constant magnetic field. We show that the synergy of noncommutativity and the magnetic field tames the exponential divergence of operator growth caused by the negative curvature of the hyperbolic space. Their combined effect results in a first-order

    更新日期:2020-08-20
  • Transport in one-dimensional integrable quantum systems
    SciPost Phys. (IF 5.051) Pub Date : 2020-08-20
    Jesko Sirker

    These notes are based on a series of three lectures given at the Les Houches summer school on 'Integrability in Atomic and Condensed Matter Physics' in August 2018. They provide an introduction into the unusual transport properties of integrable models in the linear response regime focussing, in particular, on the spin-1/2 XXZ spin chain.

    更新日期:2020-08-20
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