abstract stringlengths 3 192k | title stringlengths 4 857 |
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we consider an f(q, t) type gravity model in which the scalar non-metricity qα μ ν of the space-time is expressed in its standard weyl form, and it is fully determined by a vector field wμ. the field equations of the theory are obtained under the assumption of the vanishing of the total scalar curvature, a condition wh... | weyl type f(q, t) gravity, and its cosmological implications |
in this paper we show that any static and spherically symmetric anisotropic solution of the einstein field equations can be thought as a system sourced by certain deformed isotropic system in the context of minimal geometric deformation-decoupling approach. to be more precise, we developed a mechanism to obtain an isot... | minimal geometric deformation: the inverse problem |
cosmological correlators from inflation are often generated at tree level and hence loop contributions are bounded to be small corrections by perturbativity. here we discuss a scenario where this is not the case. recently, it has been shown that for any number of scalar fields of any mass, the parity-odd trispectrum of... | leading loops in cosmological correlators |
the r + r 2, shortly named " r 2" ("starobinsky") inflationary model, represents a fully consistent example of a one-parameter inflationary scenario. this model has a "graceful exit" from inflation and provides a mechanism for subsequent creation and final thermalization of the standard matter. moreover, it produces a ... | occurrence of exact r 2 inflation in non-local uv-complete gravity |
we derive new constraints on massive gravity from unitarity and analyticity of scattering amplitudes. our results apply to a general effective theory defined by einstein gravity plus the leading soft diffeomorphism-breaking corrections. we calculate scattering amplitudes for all combinations of tensor, vector, and scal... | positive signs in massive gravity |
the concept of minimum length, widely accepted as a low-energy effect of quantum gravity, manifests itself in quantum mechanics through generalized uncertainty principles. curved momentum space, on the other hand, is at the heart of similar applications such as doubly special relativity. we introduce a duality between ... | generalized uncertainty principle or curved momentum space? |
we test the proposal of [1] for the holographic computation of the charged moments and the resulting symmetry-resolved entanglement entropy in different excited states, as well as for two entangling intervals. our holographic computations are performed in u(1) chern-simons-einstein-hilbert gravity, and are confirmed by... | symmetry-resolved entanglement for excited states and two entangling intervals in ads3/cft2 |
these notes are an introduction to general relativity as a quantum effective field theory, following the material given in a short course on the subject at epfl. the intent is to develop general relativity starting from a quantum field theoretic viewpoint, and to introduce some of the techniques needed to understand th... | epfl lectures on general relativity as a quantum field theory |
we revisit the recent reformulation of the holographic prescription to compute entanglement entropy in terms of a convex optimization problem, introduced by freedman and headrick. according to it, the holographic entanglement entropy associated to a boundary region is given by the maximum flux of a bounded, divergencel... | geometric aspects of holographic bit threads |
recent work has established the existence of stable quantum phases of matter described by symmetric tensor gauge fields, which naturally couple to particles of restricted mobility, such as fractons. we focus on a minimal toy model of a rank 2 tensor gauge field, consisting of fractons coupled to an emergent graviton (m... | emergent gravity of fractons: mach's principle revisited |
relaxing the riemannian condition to incorporate geometric quantities such as torsion and non-metricity may allow to explore new physics associated with defects in a hypothetical space-time microstructure. here we show that non-metricity produces observable effects in quantum fields in the form of 4-fermion contact int... | observable traces of non-metricity: new constraints on metric-affine gravity |
we use a thermal model with single freeze-out to determine longitudinal polarization of λ hyperons emitted from a hot and rotating hadronic medium. we consider the top rhic energies and use the model parameters determined in the previous analyses of particle spectra and elliptic flow. using a direct connection between ... | longitudinal spin polarization in a thermal model |
in the hydrodynamic regime, field theories typically have their boost symmetry spontaneously broken due to the presence of a thermal rest frame although the associated goldstone field does not acquire independent dynamics. we show that this is not the case for carrollian field theories where the boost goldstone field p... | carrollian fluids and spontaneous breaking of boost symmetry |
we address the questions of conservation and integrability of the charges in two and three-dimensional gravity theories at infinity. the analysis is performed in a framework that allows us to treat simultaneously asymptotically locally ads and asymptotically locally flat spacetimes. in two dimensions, we start from a g... | conservation and integrability in lower-dimensional gravity |
we prove that quasinormal modes (or resonant states) for linear wave equations in the subextremal kerr and kerr-de sitter spacetimes are real analytic. the main novelty of this paper is the observation that the bicharacteristic flow associated to the linear wave equations for quasinormal modes with respect to a suitabl... | analyticity of quasinormal modes in the kerr and kerr-de sitter spacetimes |
asymptotic safety provides a mechanism for constructing a consistent and predictive quantum theory of gravity valid on all length scales. its key ingredient is a non-gaussian fixed point of the gravitational renormalization group flow which controls the scaling of couplings and correlation functions at high energy. in ... | quantum gravity on foliated spacetimes: asymptotically safe and sound |
chirality or handedness distinguishes an object from its mirror images, such as the spread thumb, index finger, and middle finger of the right and left hand. in mathematics, it is described by the outer product of three vectors that obey a right-hand vs. left-hand rule. the chirality of ground state magnetic textures d... | chirality as generalized spin-orbit interaction in spintronics |
we investigate the conditions for the (in)stability of the isotropic pressure condition in collapsing spherically symmetric, dissipative fluid distributions. it is found that dissipative fluxes, and/or energy density inhomogeneities and/or the appearance of shear in the fluid flow, force any initially isotropic configu... | stability of the isotropic pressure condition |
litebird, the lite (light) satellite for the study of b-mode polarization and inflation from cosmic background radiation detection, is a space mission for primordial cosmology and fundamental physics. jaxa selected litebird in may 2019 as a strategic large-class (l-class) mission, with its expected launch in the late 2... | litebird satellite: jaxa's new strategic l-class mission for all-sky surveys of cosmic microwave background polarization |
the aim of this work is to obtain new analitical solutions for einstein equations in the anisotropical domain. this will be done via the minimal geometric deformation (mgd) approach, which is a simple and systematical method that allow us to decouple the einstein equations. it requires a perfect fluid known solution th... | using mgd gravitational decoupling to extend the isotropic solutions of einstein equations to the anisotropical domain |
horizonless compact objects with light rings (or photon spheres) are becoming increasingly popular in recent years for several reasons. in this paper, we show that a horizonless object such as a wormhole of morris-thorne type can have two photon spheres. in particular, we show that, in addition to the one present outsi... | a novel gravitational lensing feature by wormholes |
we investigate the deflection of light by a rotating global monopole spacetime and a rotating letelier spacetime in the weak deflection approximation. to this end, we apply the gauss-bonnet theorem to the corresponding osculating optical geometries and show that the deflection of light increases in each spacetime due t... | light deflection by a rotating global monopole spacetime |
double holography plays a crucial role in recent studies of hawking radiation and information paradox by relating an intermediate picture, in which a dynamical gravity living on an end-of-the-world brane is coupled to a non-gravitational heat bath, to a much better-understood bcft picture as well as a bulk picture. in ... | causal structures and nonlocality in double holography |
in the recent literature it has been shown that the h 0 tension may be eliminated if an abrupt physics transition changed the cepheid parameters in the near past of the universe, nearly 70-150 myrs ago. in this letter we stress the possibility that this abrupt transition was caused by the smooth passage of our universe... | did the universe experience a pressure non-crushing type cosmological singularity in the recent past? |
blázquez-salcedo et al. [phys. rev. lett. 126, 101102 (2021), 10.1103/physrevlett.126.101102] obtained asymptotically flat traversable wormhole solutions in the einstein-dirac-maxwell theory without using phantom matter. the normalizable numerical solutions found therein require a peculiar behavior at the throat: the m... | traversable wormholes in general relativity |
we explore asymptotic safety of gravity-matter systems, discovering indications for a near-perturbative nature of these systems in the ultraviolet. our results are based on the dynamical emergence of effective universality at the asymptotically safe fixed point. our findings support the conjecture that an asymptoticall... | how perturbative is quantum gravity? |
we present the first complete (i.e., ambiguity-free) derivation of the equations of motion of two nonspinning compact objects up to the 4pn (post-newtonian) order, based on the fokker action of point particles in harmonic coordinates. the last ambiguity parameter is determined from first principle, by resorting to a ma... | ambiguity-free completion of the equations of motion of compact binary systems at the fourth post-newtonian order |
the static patch of de sitter spacetime and the rindler wedge of minkowski spacetime are causal diamonds admitting a true killing field, and they behave as thermodynamic equilibrium states under gravitational perturbations. we explore the extension of this gravitational thermodynamics to all causal diamonds in maximall... | gravitational thermodynamics of causal diamonds in (a)ds |
in this paper, we explore higher-dimensional asymptotically flat wormhole geometries in the framework of gauss-bonnet (gb) gravity and investigate the effects of the gb term, by considering a specific radial-dependent redshift function and by imposing a particular equation of state. this work is motivated by previous a... | einstein-gauss-bonnet traversable wormholes satisfying the weak energy condition |
the brown-york stress tensor provides a means for defining quasilocal gravitational charges in subregions bounded by a timelike hypersurface. we consider the generalization of this stress tensor to null hypersurfaces. such a stress tensor can be derived from the on-shell subregion action of general relativity associate... | brown-york charges at null boundaries |
in this work, i present exact cosmological solutions from wesson's induced matter model applied to a general 5d metric in theory of gravity. the non-conservation of the energy-momentum tensor, predicted by theory, allows the derivation of a relation that describes the time evolution of the extra coordinate, revealing i... | cosmological solutions from induced matter model applied to 5d gravity and the shrinking of the extra coordinate |
we explore asymptotically ads2 solutions of a particular two-dimensional dilaton-gravity theory. in the deep interior, these solutions flow to the cosmological horizon of ds2. we calculate various matter perturbations at the linearised and non-linear level. we consider both euclidean and lorentzian perturbations. the r... | de sitter horizons & holographic liquids |
we consider a general theory of all possible quadratic, first-order derivative terms of the non-metricity tensor in the framework of symmetric teleparallel geometry. we apply the noether symmetry approach to classify those models that are invariant under point transformations in a cosmological background and we use the... | noether symmetries in symmetric teleparallel cosmology |
the horndeski theory of gravity is known as the most general scalar-tensor theory with second-order field equations. recently, it was demonstrated by gleyzes et al. that the horndeski theory can further be generalized in such a way that although field equations are of third order, the number of propagating degrees of f... | breaking of vainshtein screening in scalar-tensor theories beyond horndeski |
working within the post-newtonian (pn) approximation to general relativity, we use the effective field theory (eft) framework to study the conservative dynamics of the two-body motion at fourth pn order, at fifth order in the newton constant. this is one of the missing pieces preventing the computation of the full lagr... | effective field theory approach to the gravitational two-body dynamics at fourth post-newtonian order and quintic in the newton constant |
we construct the general effective field theory of gravity coupled to the standard model of particle physics, which we name grsmeft. our method allows the systematic derivation of a non-redundant set of operators of arbitrary dimension with generic field content and gravity. we explicitly determine the pure gravity eft... | effective field theory of gravity to all orders |
the randomness of the quantum tunneling process induces superhorizon curvature perturbations during cosmological first-order phase transitions. we for the first time utilize curvature perturbations to constrain the phase transition parameters, and find that the observations of the cosmic microwave background spectrum d... | constraining first-order phase transitions with curvature perturbations |
the fokker action governing the motion of compact binary systems without spins is derived in harmonic coordinates at the fourth post-newtonian approximation (4pn) of general relativity. dimensional regularization is used for treating the local ultraviolet (uv) divergences associated with point particles, followed by a ... | fokker action of nonspinning compact binaries at the fourth post-newtonian approximation |
recently, a codimension two holography called wedge holography is proposed as a generalization of ads/cft. it is conjectured that a gravitational theory in d + 1 dimensional wedge spacetime is dual to a d - 1 dimensional cft on the corner of the wedge. in this paper, we give an exact construction of the gravitational s... | an exact construction of codimension two holography |
future measurements of primordial non-gaussianity can reveal cosmologically produced particles with masses of order the inflationary hubble scale and their interactions with the inflaton, giving us crucial insights into the structure of fundamental physics at extremely high energies. we study gauge-higgs theories that ... | heavy-lifting of gauge theories by cosmic inflation |
we show that an n-dimensional generalized robertson-walker (grw) space-time with divergence-free conformal curvature tensor exhibits a perfect fluid stress-energy tensor for any f(r) gravity model. furthermore, we prove that a conformally flat grw space-time is still a perfect fluid in both f(r) and quadratic gravity w... | cosmological perfect-fluids in f(r) gravity |
we study entanglement harvested from a quantum field through local interaction with unruh-dewitt detectors undergoing linear acceleration. the interactions allow entanglement to be swapped locally from the field to the detectors. we find an enhancement in the entanglement harvesting by two detectors with anti-parallel ... | acceleration-assisted entanglement harvesting and rangefinding |
using the effective field theory approach together with the boundary-to-bound map, we compute the next-to-leading order (nlo) post-minkowskian (pm) tidal effects in the conservative dynamics of compact binary systems. we derive the mass and current quadrupole and, for the first time, octupole corrections to the binding... | conservative tidal effects in compact binary systems to next-to-leading post-minkowskian order |
nonlocal primordial non-gaussianity (nlpng) is a smoking gun of interactions in single-field inflationary models and can be written as a combination of the equilateral and orthogonal templates. we present the first constraints on these from the redshift-space galaxy power spectra and bispectra of the boss data. these a... | constraints on single-field inflation from the boss galaxy survey |
a new approach is described to help improve the foundations of relativistic viscous fluid dynamics and its coupling to general relativity. focusing on neutral conformal fluids constructed solely in terms of hydrodynamic variables, we derive the most general viscous energy-momentum tensor yielding equations of motion of... | causality and existence of solutions of relativistic viscous fluid dynamics with gravity |
high energy heavy ion collisions are excellent ways for producing heavy hadrons and composite particles, including the light (anti)nuclei. with upgraded detectors at the relativistic heavy ion collider (rhic) and the large hadron collider (lhc), it has become possible to measure hadrons beyond their ground states. ther... | exotic hadrons from heavy ion collisions |
the generalized uncertainty principle (gup) has been directly applied to the motion of (macroscopic) test bodies on a given space-time in order to compute corrections to the classical orbits predicted in newtonian mechanics or general relativity. these corrections generically violate the equivalence principle. the gup ... | generalized uncertainty principle, classical mechanics, and general relativity |
general relativity and its higher derivative extensions have symmetric teleparallel reformulations in terms of the non-metricity tensor within a torsion-free and flat geometry. these notes present a derivation of the exact propagator for the most general infinite-derivative, even-parity and generally covariant theory i... | the spectrum of symmetric teleparallel gravity |
we revisit the shadow of rotating traversable wormholes discussing the role of the wormhole throat in the shadow formation. for certain classes of wormholes the throat serves as a potential barrier for light rays with particular impact parameters, thus modifying the shadow shape. we consider a couple of wormhole soluti... | on the shadow of rotating traversable wormholes |
for asymptotically flat spacetimes, a conjecture by strominger states that asymptotic bms-supertranslations and their associated charges at past null infinity $\mathscr{i}^{-}$ can be related to those at future null infinity $\mathscr{i}^{+}$ via an antipodal map at spatial infinity $i^{0}$. we analyse the validity of ... | bms-supertranslation charges at the critical sets of null infinity |
we study the degrees of freedom of $r^2$ gravity in flat spacetime with two approaches. by rewriting the theory a la stueckelberg, and implementing lorentz-like gauges to the metric perturbations, we confirm that the pure theory propagates one scalar degree of freedom, while the full theory contains two tensor modes in... | on the degrees of freedom of $r^2$ gravity in flat spacetime |
in this letter we discuss the intrinsic pathologies associated to theories formulated in the framework of symmetric teleparallel geometries and argue how they are prone to propagating ostrogradski ghosts. we illustrate our general argument by working out the cosmological perturbations in $f(\mathbb{q})$ theories. we fo... | on the pathological character of modifications of coincident general relativity: cosmological strong coupling and ghosts in $f(\\mathbb{q})$ theories |
exceptional field theories yield duality covariant formulations of supergravity. we show that they provide a highly efficient tool to compute the kaluza-klein mass spectra associated with compactifications around various background geometries relevant for string theory and holographic applications. this includes geomet... | kaluza-klein spectrometry for supergravity |
in gravity, spacelike separated regions can be dependent on each other due to the constraint equations. in this paper, we give a natural definition of subsystem independence and gravitational dressing of perturbations in classical gravity. we find that extremal surfaces, non-perturbative lumps of matter, and generic tr... | subregion independence in gravity |
in this paper, we revisit the infrared (ir) divergences in de sitter (ds) space using the wavefunction method, and explicitly explore how the resummation of higher-order loops leads to the stochastic formalism. in light of recent developments of the cosmological bootstrap, we track the behaviour of these nontrivial ir ... | on the ir divergences in de sitter space: loops, resummation and the semi-classical wavefunction |
we discuss three different (conformally) carrollian geometries and their relation to null infinity from the unifying perspective of cartan geometry. null infinity per se comes with numerous redundancies in its intrinsic geometry and the two other carrollian geometries can be recovered by making successive choices of ga... | carrollian manifolds and null infinity: a view from cartan geometry |
we investigate the (conformally coupled) scalar field on a general carrollian spacetime in arbitrary dimension. the analysis discloses electric and magnetic dynamics. for both, we provide the energy and the momenta of the field, accompanied by their conservation equations. we discuss the conservation and nonconservatio... | revisiting the carrollian scalar field |
it is controversial whether entanglement islands can exist in massless gravity theories. recently, it is found that the massless entanglement island appears in wedge holography with dgp gravity on the branes. in this paper, we generalize the discussions to the codim-n holography named cone holography. for simplicity, w... | massless entanglement islands in cone holography |
quantum radiation reaction is the influence of multiple photon emissions from a charged particle on the particle's dynamics, characterized by a significant energy-momentum loss per emission. here we report experimental radiation emission spectra from ultrarelativistic positrons in silicon in a regime where quantum radi... | experimental evidence of quantum radiation reaction in aligned crystals |
we discuss an approach to characterizing local degrees of freedom of a subregion in diffeomorphism-invariant theories using the extended phase space of donnelly and freidel [36]. such a characterization is important for defining local observables and entanglement entropy in gravitational theories. traditional phase spa... | local phase space and edge modes for diffeomorphism-invariant theories |
we consider higher-order derivative interactions beyond second-order generalized proca theories that propagate only the three desired polarizations of a massive vector field besides the two tensor polarizations from gravity. these new interactions follow the similar construction criteria to those arising in the extensi... | beyond generalized proca theories |
a comment on the letter by d. glavan and c. lin, phys. rev. lett. 124, 081301 (2020)., 10.1103/physrevlett.124.081301 the authors of the letter offer a reply. | comment on "einstein-gauss-bonnet gravity in four-dimensional spacetime" |
we show the existence of a general mechanism by which heavy scalar fields can be destabilized during inflation, relying on the fact that the curvature of the field space manifold can dominate the stabilizing force from the potential and destabilize inflationary trajectories. we describe a simple and rather universal se... | geometrical destabilization of inflation |
we calculate the motion of binary mass systems in gravity up to the fourth post-newtonian order. we use momentum expansions within an effective field theory approach based on feynman amplitudes in harmonic coordinates by applying dimensional regularization. we construct the canonical transformations to adm coordinates ... | fourth post-newtonian hamiltonian dynamics of two-body systems from an effective field theory approach |
we study some (conformal) field theories with global symmetries in the sector where the value of the global charge q is large. we find (as expected) that the low energy excitations of this sector are described by the general form of goldstone's theorem in the non-relativistic regime. we also derive the unexpected resul... | compensating strong coupling with large charge |
quantum electrodynamics (qed) serves as a useful toy model for classical observables in gravitational two-body systems with reduced complexity due to the linearity of qed. we investigate scattering observables in scalar qed at the sixth order in the charges (two-loop order) in a classical regime analogous to the post-m... | scalar qed as a toy model for higher-order effects in classical gravitational scattering |
in the standard approach to deriving inflationary predictions, we evolve a vacuum state in time according to the rules of a given model. since the only observables are the future values of correlators and not their time evolution, this brings about a large degeneracy: a vast number of different models are mapped to the... | from locality and unitarity to cosmological correlators |
we show that the geometry of the asymptotic infinities of minkowski spacetime (in d + 1 dimensions) is captured by homogeneous spaces of the poincaré group: the blow-ups of spatial (spi) and timelike (ti) infinities in the sense of ashtekar-hansen and a novel space ni fibering over i . we embed these spaces à la penros... | carrollian and celestial spaces at infinity |
recently, a protocol called quantum-gravity-induced entanglement of masses (qgem) that aims to test the quantum nature of gravity using the entanglement of two qubits was proposed. the entanglement can arise only if the force between the two spatially superposed masses is occurring via the exchange of a mediating virtu... | improving resilience of quantum-gravity-induced entanglement of masses to decoherence using three superpositions |
recently, table-top experiments involving massive quantum systems have been proposed to test the interface of quantum theory and gravity. in particular, the crucial point of the debate is whether it is possible to conclude anything on the quantum nature of the gravitational field, provided that two quantum systems beco... | a no-go theorem on the nature of the gravitational field beyond quantum theory |
we consider the most general asymptotically anti-de sitter boundary conditions in three-dimensional einstein gravity with negative cosmological constant. the metric contains in total twelve independent functions, six of which are interpreted as chemical potentials (or non-normalizable fluctuations) and the other half a... | most general ads3 boundary conditions |
in this paper we show that there is a universal prediction for the newtonian potential for a specific class of infinite derivative, ghost-free, quadratic curvature gravity. we show that in order to make such a theory ghost free at a perturbative level, the newtonian potential always falls-off as 1 /r in the infrared li... | behavior of the newtonian potential for ghost-free gravity and singularity free gravity |
we highlight how the existence of an ultraviolet completion for interacting standard-model type matter puts constraints on the viable microscopic dynamics of asymptotically safe quantum gravity within truncated renormalization group flows. a first constraint—the weak-gravity bound—is rooted in the destruction of quantu... | viability of quantum-gravity induced ultraviolet completions for matter |
the correspondence between riemann-finsler geometries and effective field theories with spin-independent lorentz violation is explored. we obtain the general quadratic action for effective scalar field theories in any spacetime dimension with lorentz-violating operators of arbitrary mass dimension. classical relativist... | riemann-finsler geometry and lorentz-violating scalar fields |
the large high altitude air shower observatory (lhaaso) has reported the detection of a large number of multi-tev-scale photon events also including several pev-scale gamma-ray-photon events with energy as high as 1.4 pev. the possibility that some of these events may have extragalactic origins is not yet excluded. her... | axion-photon conversion of lhaaso multi-tev and pev photons |
we use the functional renormalization group equation for the effective average action to study the non-gaussian renormalization group fixed points (ngfps) arising within the framework of f(r) -gravity minimally coupled to an arbitrary number of scalar, dirac, and vector fields. based on this setting we provide comprehe... | asymptotically safe f(r) -gravity coupled to matter i: the polynomial case |
we propose a scenario to retrodict the top and bottom mass and the abelian gauge coupling from first principles in a microscopic model including quantum gravity. in our approximation, antiscreening quantum-gravity fluctuations induce an asymptotically safe fixed point for the abelian hypercharge leading to a uniquely f... | mass difference for charged quarks from asymptotically safe quantum gravity |
new classes of modified teleparallel theories of gravity are introduced. the action of this theory is constructed to be a function of the irreducible parts of torsion f (tax ,tten ,tvec), where tax ,tten and tvec are squares of the axial, tensor and vector components of torsion, respectively. this is the most general (... | new classes of modified teleparallel gravity models |
we study several aspects of higher-order gravities constructed from general contractions of the riemann tensor and the metric in arbitrary dimensions. first, we use the fast-linearization procedure presented in [p. bueno and p. a. cano, arxiv:1607.06463] to obtain the equations satisfied by the metric perturbation mode... | aspects of general higher-order gravities |
we study aspects of jackiw-teitelboim (jt) quantum gravity in two-dimensional nearly de sitter (ds) spacetime, as well as pure de sitter quantum gravity in three dimensions. these are each theories of boundary modes, which include a reparameterization field on each connected component of the boundary as well as topolog... | low-dimensional de sitter quantum gravity |
in a broad class of gravity theories, the equations of motion for vacuum compactifications give a curvature bound on the ricci tensor minus a multiple of the hessian of the warping function. using results in so-called bakry-émery geometry, we put rigorous general bounds on the kk scale in gravity compactifications in t... | leaps and bounds towards scale separation |
we introduce physics-informed neural networks - neural networks that are trained to solve supervised learning tasks while respecting any given laws of physics described by general nonlinear partial differential equations. in this work, we present our developments in the context of solving two main classes of problems: ... | physics-informed neural networks: a deep learning framework for solving forward and inverse problems involving nonlinear partial differential equations |
a universal fault-tolerant quantum computer that can efficiently solve problems such as integer factorization and unstructured database search requires millions of qubits with low error rates and long coherence times. while the experimental advancement toward realizing such devices will potentially take decades of rese... | noisy intermediate-scale quantum algorithms |
quantum-mechanical effects at the macroscopic level were first explored in josephson-junction-based superconducting circuits in the 1980s. in recent decades, the emergence of quantum information science has intensified research toward using these circuits as qubits in quantum information processors. the realization tha... | circuit quantum electrodynamics |
thermalizing quantum systems are conventionally described by statistical mechanics at equilibrium. however, not all systems fall into this category, with many-body localization providing a generic mechanism for thermalization to fail in strongly disordered systems. many-body localized (mbl) systems remain perfect insul... | colloquium: many-body localization, thermalization, and entanglement |
we review some recent developments in the statistical mechanics of isolated quantum systems. we provide a brief introduction to quantum thermalization, paying particular attention to the eigenstate thermalization hypothesis (eth) and the resulting single-eigenstate statistical mechanics. we then focus on a class of sys... | many-body localization and thermalization in quantum statistical mechanics |
the current understanding of the role of topology in non-hermitian (nh) systems and its far-reaching physical consequences observable in a range of dissipative settings are reviewed. in particular, how the paramount and genuinely nh concept of exceptional degeneracies, at which both eigenvalues and eigenvectors coalesc... | exceptional topology of non-hermitian systems |
a review is given on the foundations and applications of non-hermitian classical and quantum physics. first, key theorems and central concepts in non-hermitian linear algebra, including jordan normal form, biorthogonality, exceptional points, pseudo-hermiticity and parity-time symmetry, are delineated in a pedagogical ... | non-hermitian physics |
this review gives a pedagogical introduction to the eigenstate thermalization hypothesis (eth), its basis, and its implications to statistical mechanics and thermodynamics. in the first part, eth is introduced as a natural extension of ideas from quantum chaos and random matrix theory (rmt). to this end, we present a b... | from quantum chaos and eigenstate thermalization to statistical mechanics and thermodynamics |
we study a quantum-mechanical model proposed by sachdev, ye and kitaev. the model consists of n majorana fermions with random interactions of a few fermions at a time. it it tractable in the large-n limit, where the classical variable is a bilocal fermion bilinear. the model becomes strongly interacting at low energies... | remarks on the sachdev-ye-kitaev model |
the coherent superposition of states, in combination with the quantization of observables, represents one of the most fundamental features that mark the departure of quantum mechanics from the classical realm. quantum coherence in many-body systems embodies the essence of entanglement and is an essential ingredient for... | colloquium: quantum coherence as a resource |
bound states in the continuum (bics) are waves that remain localized even though they coexist with a continuous spectrum of radiating waves that can carry energy away. their very existence defies conventional wisdom. although bics were first proposed in quantum mechanics, they are a general wave phenomenon and have sin... | bound states in the continuum |
non-hermitian systems exhibit striking exceptions from the paradigmatic bulk-boundary correspondence, including the failure of bulk bloch band invariants in predicting boundary states and the (dis)appearance of boundary states at parameter values far from those corresponding to gap closings in periodic systems without ... | biorthogonal bulk-boundary correspondence in non-hermitian systems |
we extend the theory of dipole moments in crystalline insulators to higher multipole moments. as first formulated in benalcazar et al. [science 357, 61 (2017), 10.1126/science.aah6442], we show that bulk quadrupole and octupole moments can be realized in crystalline insulators. in this paper, we expand in great detail ... | electric multipole moments, topological multipole moment pumping, and chiral hinge states in crystalline insulators |
ultrastrong coupling between light and matter has, in the past decade, transitioned from a theoretical idea to an experimental reality. it is a new regime of quantum light-matter interaction, which goes beyond weak and strong coupling to make the coupling strength comparable to the transition frequencies in the system.... | ultrastrong coupling between light and matter |
shortcuts to adiabaticity (sta) are fast routes to the final results of slow, adiabatic changes of the controlling parameters of a system. the shortcuts are designed by a set of analytical and numerical methods suitable for different systems and conditions. a motivation to apply sta methods to quantum systems is to man... | shortcuts to adiabaticity: concepts, methods, and applications |
while hermiticity lies at the heart of quantum mechanics, recent experimental advances in controlling dissipation have brought about unprecedented flexibility in engineering non-hermitian hamiltonians in open classical and quantum systems. examples include parity-time-symmetric optical systems with gain and loss, dissi... | topological phases of non-hermitian systems |
this is an introductory review of the physics of quantum spin liquid states. quantum magnetism is a rapidly evolving field, and recent developments reveal that the ground states and low-energy physics of frustrated spin systems may develop many exotic behaviors once we leave the regime of semiclassical approaches. the ... | quantum spin liquid states |
in the past 20 years, impressive progress has been made both experimentally and theoretically in superconducting quantum circuits, which provide a platform for manipulating microwave photons. this emerging field of superconducting quantum microwave circuits has been driven by many new interesting phenomena in microwave... | microwave photonics with superconducting quantum circuits |
in this contribution to the special software-centered issue, the orca program package is described. we start with a short historical perspective of how the project began and go on to discuss its current feature set. orca has grown into a rather comprehensive general-purpose package for theoretical research in all areas... | the orca quantum chemistry program package |
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