abstract stringlengths 3 192k | title stringlengths 4 857 |
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in the recent proposal [s. w. wei et al., black hole solutions as topological thermodynamic defects, phys. rev. lett. 129, 191101 (2022)., 10.1103/physrevlett.129.191101], the black holes were viewed as topological thermodynamic defects by using the generalized off shell free energy. in this paper, we follow such propo... | topological natures of the gauss-bonnet black hole in ads space |
in recent times there is a surge of interest in constructing einstein-gauss-bonnet (egb) gravity, in the limit d → 4, of the d-dimensional egb gravity. interestingly, the static spherically symmetric solutions in the various proposed d → 4 regularized egb gravities coincide, and incidentally some other theories also ad... | generating black holes in 4d einstein-gauss-bonnet gravity |
we show that extremal kerr black holes are sensitive probes of new physics. stringy or quantum corrections to general relativity are expected to generate higher-curvature terms in the gravitational action. we show that in the presence of these terms, asymptotically flat extremal rotating black holes have curvature sing... | extremal kerr black holes as amplifiers of new physics |
we construct an infinite family of microstates for black holes in minkowski spacetime which have effective semiclassical descriptions in terms of collapsing dust shells in the black hole interior. quantum mechanical wormholes cause these states to have exponentially small, but universal, overlaps. we show that these ov... | microscopic origin of the entropy of astrophysical black holes |
we consider the low temperature quantum theory of a charged black hole of zero temperature horizon radius $r_h$, in a spacetime which is asymptotically ads$_{d}$ ($d > 3$) far from the horizon. at temperatures $t \ll 1/r_h$, the near-horizon geometry is ads$_2$, and the black hole is described by a universal 0+1 dim... | universal low temperature theory of charged black holes with ads2 horizons |
primordial black holes (pbhs) might be formed in the early universe and could comprise at least a fraction of the dark matter. using the recently released gwtc-2 dataset from the third observing run of the ligo-virgo collaboration, we investigate whether current observations are compatible with the hypothesis that all ... | constraining the primordial black hole scenario with bayesian inference and machine learning: the gwtc-2 gravitational wave catalog |
we present the first surrogate model for gravitational waveforms from the coalescence of precessing binary black holes. we call this surrogate model nrsur4d2s. our methodology significantly extends recently introduced reduced-order and surrogate modeling techniques, and is capable of directly modeling numerical relativ... | a surrogate model of gravitational waveforms from numerical relativity simulations of precessing binary black hole mergers |
in this paper, we construct an effective rotating loop quantum black hole (lqbh) solution, starting from the spherical symmetric lqbh by applying the newman-janis algorithm modified by azreg-aïnou's noncomplexification procedure, and study the effects of loop quantum gravity (lqg) on its shadow. given the rotating lqbh... | shadow and quasinormal modes of a rotating loop quantum black hole |
combining intervals of ekpyrotic (ultra-slow) contraction with a (non-singular) classical bounce naturally leads to a novel cyclic theory of the universe in which the hubble parameter, energy density and temperature oscillate periodically, but the scale factor grows by an exponential factor from one cycle to the next. ... | a new kind of cyclic universe |
the formation and abundance of primordial black holes (pbhs) arising from the curvature perturbation ζ is studied. the non-linear relation between ζ and the density contrast δ means that, even when ζ has an exactly gaussian distribution, significant non-gaussianities affecting pbh formation must be considered. numerica... | primordial black hole formation and abundance: contribution from the non-linear relation between the density and curvature perturbation |
recently, a novel formula for computing entropy in theories coupled to semi-classical gravity has been devised. using this so-called island formula the entropy of semi-classical black holes follows a page curve. here, we study the relation between this novel entropy and semi-classical entropy in the context of doubly-h... | homology conditions for rt surfaces in double holography |
we present an automated method for finding hidden symmetries, defined as symmetries that become manifest only in a new coordinate system that must be discovered. its core idea is to quantify asymmetry as violation of certain partial differential equations, and to numerically minimize such violation over the space of al... | machine learning hidden symmetries |
the er = epr correspondence relates a superposition of entangled, disconnected spacetimes to a connected spacetime with an einstein-rosen bridge. we construct examples in which both sides may be described by weakly-coupled string theory. the relation between them is given by a lorentzian continuation of the fzz duality... | stringy er = epr |
we conduct a thorough bayesian analysis of the possibility that the black hole merger events seen in gravitational waves are primordial black hole (pbh) mergers. using the latest merger rate models for pbh binaries drawn from a log-normal mass function, we compute posterior parameter constraints and bayesian evidences ... | bayesian analysis of ligo-virgo mergers: primordial versus astrophysical black hole populations |
we study two-dimensional eternal black holes with non-zero mass, where each asymptotic boundary is in contact with a cft on a circle, following the doubly holographic braneworld models constructed in [1-3]. we compute the page curve of the black hole (or the bath cfts), which amounts to finding different geodesics in t... | quantum extremal islands made easy. part iv. massive black holes on the brane |
matrix quantum mechanics plays various important roles in theoretical physics, such as a holographic description of quantum black holes, and it underpins the only practical numerical approach to the study of complex high-dimensional supergravity theories. understanding quantum black holes and the role of entanglement i... | matrix-model simulations using quantum computing, deep learning, and lattice monte carlo |
we investigate structural aspects of jt gravity through its bf description. in particular, we provide evidence that jt gravity should be thought of as (a coset of) the noncompact subsemigroup sl +(2 , &r;) bf theory. we highlight physical implications, including the famous plancherel measure sinh 2π √{e} . exploiting t... | fine structure of jackiw-teitelboim quantum gravity |
we revisit the covariant phase space formalism applied to gravitational theories with null boundaries, utilizing the most general boundary conditions consistent with a fixed null normal. to fix the ambiguity inherent in the wald-zoupas definition of quasilocal charges, we propose a new principle, based on holographic r... | anomalies in gravitational charge algebras of null boundaries and black hole entropy |
a wide variety of astrophysical and cosmological sources are expected to contribute to a stochastic gravitational-wave background. following the observations of gw150914 and gw151226, the rate and mass of coalescing binary black holes appear to be greater than many previous expectations. as a result, the stochastic bac... | upper limits on the stochastic gravitational-wave background from advanced ligo's first observing run |
gravitational-wave observations of binary black holes currently rely on theoretical models that predict the dominant multipoles (ℓ=2 ,|m |=2 ) of the radiation during inspiral, merger, and ringdown. we introduce a simple method to include the subdominant multipoles to binary black hole gravitational waveforms, given a ... | first higher-multipole model of gravitational waves from spinning and coalescing black-hole binaries |
effects of massive object's spin on massive-massless 2 → 2 classical scattering is studied. focus is set on the less-considered dimensionless expansion parameter λ/b, where λ is the massless particle's wavelength and b is the impact parameter. corrections in λ/b start to appear from o (g2), with leading correction term... | gravitational faraday effect from on-shell amplitudes |
the material surrounding accreting supermassive black holes connects the active galactic nucleus with its host galaxy and, besides being responsible for feeding the black hole, provides important information on the feedback that nuclear activity produces on the galaxy. in this review, we summarize our current understan... | nuclear obscuration in active galactic nuclei |
the counting of bps states in four-dimensional ${\cal n}=1$ theories has attracted a lot of attention in recent years. for superconformal theories, these states are in one-to-one correspondence with local operators in various short representations. the generating function for this counting problem has branch cuts and h... | eft and the susy index on the 2nd sheet |
we revisit the spectrum of pure quantum gravity in ads3. the computation of the torus partition function will — if computed using a gravitational path integral that includes only smooth saddle points — lead to a density of states which is not physically sensible, as it has a negative degeneracy of states for some energ... | pure gravity and conical defects |
holographic braneworlds are used to present a higher-dimensional origin of extended black hole thermodynamics. in this framework, classical, asymptotically anti-de sitter black holes map to quantum black holes in one dimension less, with a conformal matter sector that backreacts on the brane geometry. varying the brane... | higher-dimensional origin of extended black hole thermodynamics |
making use of the recently derived, all-spin, opposite-helicity compton amplitude, we calculate the classical gravitational scattering amplitude for one spinning and one spinless object at o (g2) and all orders in spin. by construction, this amplitude exhibits the spin structure that has been conjectured to describe ke... | classical gravitational spinning-spinless scattering at o (g2s∞) |
in this paper, we study the weak gravitational lensing in the spacetime of rotating regular black hole geometries such as ayon-beato-garcía (abg), bardeen, and hayward black holes. we calculate the deflection angle of light using the gauss-bonnet theorem (gbt) and show that the deflection of light can be viewed as a pa... | deflection of light by rotating regular black holes using the gauss-bonnet theorem |
we derive new positivity bounds for scattering amplitudes in theories with a massless graviton in the spectrum in four spacetime dimensions, of relevance for the weak gravity conjecture and modified gravity theories. the bounds imply that extremal black holes are self-repulsive, m /|q |<1 in suitable units, and that... | positivity of amplitudes, weak gravity conjecture, and modified gravity |
thermodynamic quantities associated with black holes in anti-de sitter space obey an interesting identity when the cosmological constant is included as one of the dynamical variables, the generalized smarr relation. we show that this relation can easily be understood from the point of view of the dual holographic field... | holographic black hole chemistry |
we sharpen swampland constraints on 8d supergravity theories by studying consistency conditions on worldvolume theory of 3-brane probes. combined with a stronger form of the cobordism conjecture, this leads to the reconstruction of the compact internal geometry and implies strong restrictions on the gauge algebra and o... | 8d supergravity, reconstruction of internal geometry and the swampland |
we report on the polarized light curves of the galactic center supermassive black hole sagittarius a*, obtained at millimeter wavelength with the atacama large millimeter/submillimeter array (alma). the observations took place as a part of the event horizon telescope campaign. we compare the observations taken during t... | orbital motion near sagittarius a* . constraints from polarimetric alma observations |
we conduct a preliminary investigation into the phenomenological implications of einsteinian cubic gravity (ecg), a four-dimensional theory of gravity cubic in curvature of interest for its unique formulation and properties. we find an analytic approximation for a spherically symmetric black hole solution to this theor... | shadows, signals, and stability in einsteinian cubic gravity |
in a recent note [1] i argued that the holographic origin of ordinary gravitational attraction is the quantum mechanical tendency for operators to grow under time evolution. in a follow-up [2] the claim was tested in the context of the syk theory and its bulk dual—the theory of near-extremal black holes. in this paper ... | complexity and newton's laws |
we construct regular rotating black hole and no-horizon spacetimes based on the recently introduced spherically symmetric generic regular black hole spacetimes related to electric or magnetic charge under nonlinear electrodynamics coupled to general relativity that for special values of the spacetime parameters reduce ... | generic rotating regular black holes in general relativity coupled to nonlinear electrodynamics |
we study a holographic construction of quantum rotating btz black holes that incorporates the exact backreaction from strongly coupled quantum conformal fields. it is based on an exact four-dimensional solution for a black hole localized on a brane in ads4, first discussed some years ago but never fully investigated in... | quantum btz black hole |
we consider black holes generically sourced by quantum matter described by regular wavefunctions. this allows for integrable effective energy densities and the removal of cauchy horizons in spherically symmetric configurations. moreover, we identify the ultrarigid rotation of the kerr spacetime as causing the existence... | quantum rotating black holes |
we study the topology of black hole thermodynamics in four-, five-, and seven-dimensional r -charged black holes. while the 4d r -charged black hole possesses four charges, the 5d and 7d r -charged black holes have three and two charges, respectively. in our study, we investigate the influence of charge configuration o... | topology of thermodynamics in r -charged black holes |
we calculate the scattering amplitude of two rotating objects with the linear-in-curvature spin-induced multipoles of kerr black holes at o (g2) and all orders in the spins of both objects. this is done including the complete set of contact terms potentially relevant to kerr-black-hole scattering at o (g2). as such, ke... | classical gravitational scattering amplitude at o (g2s1∞s2∞) |
dijet events are studied in the proton-proton collision data set recorded at √{s }=13 tev with the atlas detector at the large hadron collider in 2015 and 2016, corresponding to integrated luminosities of 3.5 fb-1 and 33.5 fb-1 respectively. invariant mass and angular distributions are compared to background prediction... | search for new phenomena in dijet events using 37 fb-1 of p p collision data collected at √{s }=13 tev with the atlas detector |
electrons in clean macroscopic samples of graphene exhibit an astonishing variety of quantum phases when strong perpendicular magnetic field is applied. these include integer and fractional quantum hall states as well as symmetry broken phases and quantum hall ferromagnetism. here we show that mesoscopic graphene flake... | quantum holography in a graphene flake with an irregular boundary |
we show that bulk operators lying between the outermost extremal surface and the asymptotic boundary admit a simple boundary reconstruction in the classical limit. this is the converse of the python's lunch conjecture, which proposes that operators with support between the minimal and outermost (quantum) extremal surfa... | a world without pythons would be so simple |
we examine the question how string theory achieves a sum over bulk geometries with fixed asymptotic boundary conditions. we discuss this problem with the help of the tensionless string on ℳ3×s3×t4 (with one unit of ns-ns flux) that was recently understood to be dual to the symmetric orbifold symn (t4). we strengthen th... | summing over geometries in string theory |
the majority of the accreting supermassive black holes in the universe are obscured by large columns of gas and dust. the location and evolution of this obscuring material have been the subject of intense research in the past decades, and are still debated. a decrease in the covering factor of the circumnuclear materia... | the close environments of accreting massive black holes are shaped by radiative feedback |
we extract the black hole (bh) static tidal deformability coefficients (love numbers) and their spin-0 and spin-1 analogs by comparing on-shell amplitudes for fields to scatter off a spinning bh in the worldline effective field theory and in general relativity. we point out that the general relativity amplitudes due to... | vanishing of black hole tidal love numbers from scattering amplitudes |
the rate of complexification of a quantum state is conjectured to be bounded from above by the average energy of the state. a different conjecture relates the complexity of a holographic cft state to the on-shell gravitational action of a certain bulk region. we use `complexity equals action' conjecture to study the ti... | evolution of complexity following a global quench |
effective gravity and gauge fields are emergent properties intrinsic for low-energy quasiparticles in topological semimetals. here, taking two dirac semimetals as examples, we demonstrate that applied lattice strain can generate warped spacetime, with fascinating analogues in astrophysics. particularly, we study the po... | artificial gravity field, astrophysical analogues, and topological phase transitions in strained topological semimetals |
modular covariance of torus one-point functions constrains the three point function coefficients of a two dimensional cft. this leads to an asymptotic formula for the average value of light-heavy-heavy three point coefficients, generalizing cardy's formula for the high energy density of states. the derivation uses cert... | a cardy formula for three-point coefficients or how the black hole got its spots |
we study two disjoint universes in an entangled pure state. when only one universe contains gravity, the path integral for the nth rényi entropy includes a wormhole between the n copies of the gravitating universe, leading to a standard 'island formula' for entanglement entropy consistent with unitarity of quantum info... | entanglement between two gravitating universes |
we study the near-zone symmetries of a massless scalar field on four-dimensional black hole backgrounds. we provide a geometric understanding that unifies various recently discovered symmetries as part of an so(4, 2) group. of these, a subset are exact symmetries of the static sector and give rise to the ladder symmetr... | near-zone symmetries of kerr black holes |
in this paper, we study joule-thomson expansion for kerr-ads black holes in the extended phase space. a joule-thomson expansion formula of kerr-ads black holes is derived. we investigate both isenthalpic and numerical inversion curves in the t- p plane and demonstrate the cooling-heating regions for kerr-ads black hole... | joule-thomson expansion of kerr-ads black holes |
we present a new effective description of macroscopic kruskal black holes that incorporates corrections due to quantum geometry effects of loop quantum gravity. it encompasses both the "interior" region that contains classical singularities and the "exterior" asymptotic region. singularities are naturally resolved by t... | quantum transfiguration of kruskal black holes |
we study aspects of black holes and quantum chaos through the behavior of computational costs, which are distance notions in the manifold of unitaries of the theory. to this end, we enlarge nielsen geometric approach to quantum computation and provide metrics for finite temperature/energy scenarios and cft's. from the ... | black holes, complexity and quantum chaos |
the eigenstate thermalization hypothesis (eth) explains how closed unitary quantum systems can exhibit thermal behavior in pure states. in this work we examine a recently proposed microscopic model of a black hole in ads2, the so-called sachdev-ye-kitaev (syk) model. we show that this model satisfies the eigenstate the... | eigenstate thermalization in the sachdev-ye-kitaev model |
in this paper, we study the thermodynamic geometry of charged gauss-bonnet black holes (and reissner-nordström black holes, for the sake of comparison) in anti-de sitter spacetimes in both (t , v ) and (s , p ) planes. the thermodynamic phase space is known to have an underlying contact and metric structure; ruppeiner ... | thermodynamic geometry for charged gauss-bonnet black holes in ads spacetimes |
quantum scrambling describes the spreading of information into many degrees of freedom in quantum systems, such that the information is no longer accessible locally but becomes distributed throughout the system. this idea can explain how quantum systems become classical and acquire a finite temperature, or how in black... | improving metrology with quantum scrambling |
we study the holographic complexity in de sitter spacetime, especially how the hyperfast growth of holographic complexity in de sitter spacetime is affected under a small and early perturbation. the perturbed geometry is de sitter spacetime with shock waves. we find that the critical time, at which de sitter holographi... | shock waves and delay of hyperfast growth in de sitter complexity |
we present new analytic results on black hole perturbation theory. our results are based on a novel relation to four-dimensional$${\mathcal {n}}=2$$n=2supersymmetric gauge theories. we propose an exact version of bohr-sommerfeld quantization conditions on quasinormal mode frequencies in terms of the nekrasov partition ... | black hole quasinormal modes and seiberg–witten theory |
we argue that, in a theory of quantum gravity in a four dimensional asymptotically flat spacetime, all information about massless excitations can be obtained from an infinitesimal neighbourhood of the past boundary of future null infinity and does not require observations over all of future null infinity. moreover, all... | the holographic nature of null infinity |
the novel data analysis challenges posed by the laser interferometer space antenna (lisa) arise from the overwhelmingly large number of astrophysical sources in the measurement band and the density with which they are found in the data. robust detection and characterization of the numerous gravitational wave sources in... | prototype global analysis of lisa data with multiple source types |
topological lifshitz transitions involve many types of topological structures in momentum and frequency-momentum spaces, such as fermi surfaces, dirac lines, dirac and weyl points, etc., each of which has its own stability-supporting topological invariant ( n_1, n_2, n_3, {\tilde n}_3, etc.). the topology of the shape ... | exotic lifshitz transitions in topological materials |
scalar fields coupled to the gauss-bonnet invariant can undergo a tachyonic instability, leading to spontaneous scalarization of black holes. studies of this effect have so far been restricted to single black hole spacetimes. we present the first results on dynamical scalarization in head-on collisions and quasicircula... | dynamical descalarization in binary black hole mergers |
the acoustic black hole (abh) is a technique for passive vibration control that was recently developed within the structural dynamics and vibroacoustics communities. from a general perspective, the abh effect is achieved by embedding a local inhomogeneity in a thin-walled structure, typically a beam or a plate. this in... | the acoustic black hole: a review of theory and applications |
we introduce a systematic and direct procedure to generate hairy rotating black holes by deforming a spherically symmetric seed solution. we develop our analysis in the context of the gravitational decoupling approach, without resorting to the newman-janis algorithm. as examples of possible applications, we investigate... | gravitational decoupling for axially symmetric systems and rotating black holes |
we consider quantum diffusion in ultraslow-roll (usr) inflation. using the δ n formalism, we present the first stochastic calculation of the probability distribution p (r ) of the curvature perturbation during usr. we capture the nonlinearity of the system, solving the coupled evolution of the coarse-grained background... | non-gaussian tail of the curvature perturbation in stochastic ultraslow-roll inflation: implications for primordial black hole production |
simulated images of a black hole surrounded by optically thin emission typically display two main features: a central brightness depression and a narrow "photon ring" consisting of strongly lensed images superimposed over the direct emission. the photon ring closely tracks a theoretical curve on the image plane corresp... | observing the inner shadow of a black hole: a direct view of the event horizon |
we consider primordial black hole (pbh) production in inflationary α-attractors. we discuss two classes of models, namely models with a minimal polynomial superpotential as well as modulated chaotic ones that admit pbhs. we find that a significant amplification of the curvature power spectrum script pr can be realized ... | primordial black holes from α-attractors |
we propose a new entropy construct that generalizes the tsallis, rényi, sharma-mittal, barrow, kaniadakis, and loop quantum gravity entropies and reduces to the bekenstein-hawking entropy in a certain limit. this proposal is applied to the schwarzschild black hole and to spatially homogeneous and isotropic cosmology, w... | from nonextensive statistics and black hole entropy to the holographic dark universe |
we derive the third subleading (n3lo) corrections of the quadratic-in-spin sectors via the eft of spinning objects in post-newtonian (pn) gravity. these corrections consist of contributions from 4 sectors for generic compact binaries, that enter at the fifth pn order. one of these contributions is due to a new tidal in... | n3lo quadratic-in-spin interactions for generic compact binaries |
we argue that novel (highly nonclassical) quantum extremal surfaces (qess) play a crucial role in reconstructing the black hole interior even for isolated, single-sided, non-evaporating black holes (i.e. with no auxiliary reservoir). specifically, any code subspace where interior outgoing modes can be excited will have... | finding pythons in unexpected places |
space-borne gravitational wave detectors like tianqin are expected to detect gravitational wave signals emitted by the mergers of massive black hole binaries. luminosity distance information can be obtained from gravitational wave observations, and one can perform cosmological inference if redshift information can also... | constraining the cosmological parameters using gravitational wave observations of massive black hole binaries and statistical redshift information |
in a semimetal, both electrons and holes contribute to the density of states at the fermi level. the small band overlaps and multiband effects engender novel electronic properties. we show that a moderate hydrostatic pressure effectively suppresses the band gap in the elemental semiconductor black phosphorus. an electr... | pressure-induced electronic transition in black phosphorus |
a (3 +1 )-dimensional einstein-gauss-bonnet theory of gravity has been recently formulated by glavan and lin [d. glavan and c. lin, phys. rev. lett. 124, 081301 (2020), 10.1103/physrevlett.124.081301] which is different from the pure einstein theory, i.e., bypasses the lovelock's theorem and avoids ostrogradsky instabi... | black holes in the four-dimensional einstein-lovelock gravity |
the paper at hand studies the heat engine provided by black holes in the presence of massive gravity. the main motivation is to investigate the effects of massive gravity on different properties of the heat engine. it will be shown that massive gravity parameters modify the efficiency of engine on a significant level. ... | black holes in massive gravity as heat engines |
making use of definitive new lattice computations of the standard model thermodynamics during the quantum chromodynamic (qcd) phase transition, we calculate the enhancement in the mass distribution of primordial black holes (pbhs) due to the softening of the equation of state. we find that the enhancement peaks at appr... | primordial black holes with an accurate qcd equation of state |
advanced ligo's discovery of gravitational-wave events is stimulating extensive studies on the origin of binary black holes. assuming that the gravitational-wave events can be explained by binary primordial black hole mergers, we utilize the upper limits on the stochastic gravitational-wave background given by advanced... | constraints on the primordial black hole abundance from the first advanced ligo observation run using the stochastic gravitational-wave background |
the sachdev-ye-kitaev (syk) model describes a collection of randomly interacting majorana fermions that exhibits profound connections to quantum chaos and black holes. we propose a solid-state implementation based on a quantum dot coupled to an array of topological superconducting wires hosting majorana zero modes. int... | approximating the sachdev-ye-kitaev model with majorana wires |
we reformulate recent insights into black hole information in a manner emphasizing operationally-defined notions of entropy, lorentz-signature descriptions, and asymptotically flat spacetimes. with the help of replica wormholes, we find that experiments of asymptotic observers are consistent with black holes as unitary... | observations of hawking radiation: the page curve and baby universes |
computation of topological charges of the schwarzschild and charged black holes in ads in canonical and grand canonical ensembles allows for a classification of the phase transition points via the bragg-williams off-shell free energy. we attempt a topological classification of the critical points and the equilibrium ph... | topology of critical points in boundary matrix duals |
we investigate the hawking radiation of massive spin-1 vector particles, which are coupled to vacuum fluctuations of a quantum field, from a rindler modified schwarzschild black hole. rindler acceleration is used to produce the post-general relativistic theory of gravity for the distant field of a point mass. the gravi... | hawking radiation and deflection of light from rindler modified schwarzschild black hole |
an outstanding open issue in our quest for physics beyond einstein is the unification of general relativity (gr) and quantum physics. loop quantum gravity (lqg) is a leading approach toward this goal. at its heart is the central lesson of gr: gravity is a manifestation of spacetime geometry. thus, the approach emphasiz... | a short review of loop quantum gravity |
the primordial scalar power spectrum is well constrained by the cosmological data on large scales, primarily from the observations of the anisotropies in the cosmic microwave background. over the last few years, it has been recognized that a sharp rise in power on small scales will lead to the enhanced formation of pri... | primordial black holes and secondary gravitational waves from ultraslow roll and punctuated inflation |
setting the cosmological constant to be dynamical, we study the bulk and boundary thermodynamics of charged anti-de sitter black holes. we develop mass/energy formulas in terms of thermodynamic state functions for the extended thermodynamics, mixed thermodynamics, and boundary conformal field theory thermodynamics. we ... | bulk-boundary thermodynamic equivalence: a topology viewpoint |
the nearby radio galaxy m87 is a prime target for studying black hole accretion and jet formation1,2. event horizon telescope observations of m87 in 2017, at a wavelength of 1.3 mm, revealed a ring-like structure, which was interpreted as gravitationally lensed emission around a central black hole3. here we report imag... | a ring-like accretion structure in m87 connecting its black hole and jet |
to test the role of large-scale magnetic fields in accretion processes, we study the dynamics of the charged test particles in the vicinity of a black hole immersed into an asymptotically uniform magnetic field. using the hamiltonian formalism of the charged particle dynamics, we examine chaotic scattering in the effec... | acceleration of the charged particles due to chaotic scattering in the combined black hole gravitational field and asymptotically uniform magnetic field |
relativistic reflection features are commonly observed in the x-ray spectra of accreting black holes. in the presence of high quality data and with the correct astrophysical model, x-ray reflection spectroscopy can be quite a powerful tool to probe the strong gravity region, study the morphology of the accreting matter... | towards precision measurements of accreting black holes using x-ray reflection spectroscopy |
we have studied the quasinormal modes (qnms) of a slowly rotating black hole with lorentz-violating parameter in einstein-bumblebee gravity. we analyse the slow rotation approximation of the rotating black hole in the einstein-bumblebee gravity, and obtain the master equations for scalar perturbation, vector perturbati... | qnms of slowly rotating einstein-bumblebee black hole |
we perform a hierarchical bayesian analysis of the gwtc-2 catalog to investigate the mixed scenario in which the merger events are explained by black holes of both astrophysical and primordial origin. for the astrophysical scenario we adopt the phenomenological model used by the ligo/virgo collaboration and we include ... | bayesian evidence for both astrophysical and primordial black holes: mapping the gwtc-2 catalog to third-generation detectors |
it has been argued that the strong cosmic censorship conjecture is violated by reissner-nordström-de sitter black holes: for near-extremal black holes, generic scalar field perturbations arising from smooth initial data have finite energy at the cauchy horizon even though they are not continuously differentiable there.... | strong cosmic censorship: taking the rough with the smooth |
we construct the light escape cones of isotropic spot sources of radiation residing in special classes of reference frames in the kerr-de sitter (kds) black hole spacetimes, namely in the fundamental class of `non-geodesic' locally non-rotating reference frames (lnrfs), and two classes of `geodesic' frames, the radial ... | light escape cones in local reference frames of kerr-de sitter black hole spacetimes and related black hole shadows |
in this paper, we investigate the action growth in various backgrounds in einstein-maxwell-dilaton theory. we calculate the full time evolution of action growth in the anti-de sitter dilaton black hole and find it approaches the late time bound from above. we investigate the black hole which is asymptotically lifshitz ... | effect of the dilaton on holographic complexity growth |
black hole measurements have grown significantly in the new age of gravitation wave astronomy from ligo observations of binary black hole mergers. as yet unobserved massive ultralight bosonic fields represent one of the most exciting features of standard model extensions, capable of providing solutions to numerous para... | ultralight bosonic field mass bounds from astrophysical black hole spin |
the goal of these lectures is to present an informal but precise introduction to a body of concepts and methods of interest in number theory and string theory revolving around modular forms and their generalizations. modular invariance lies at the heart of conformal field theory, string perturbation theory, montonen-ol... | lectures on modular forms and strings |
rotating black hole solutions in theories of modified gravity are important as they offer an arena to test these theories through astrophysical observation. the non-rotating black hole can be hardly tested since the black hole spin is very important in any astrophysical process. we present rotating counterpart of a rec... | rotating black hole in rastall theory |
we study the nonlinear dynamics of black holes that carry scalar hair and binaries composed of such black holes. the scalar hair is due to a linear or exponential coupling between the scalar and the gauss-bonnet invariant. we work perturbatively in the coupling constant of that interaction but nonperturbatively in the ... | black holes and binary mergers in scalar gauss-bonnet gravity: scalar field dynamics |
in this paper, we demonstrate that at leading order in post minkowskian (pm) expansion, the stress-energy tensor of kerr-newman black hole can be recovered to all orders in spin from three sets of minimal coupling: the electric and gravitational minimal coupling for higher-spin particles, and the "minimal coupling" for... | kerr-newman stress-tensor from minimal coupling |
in this paper, we report on the construction of a new and independent pipeline for analyzing the public data from the first observing run of advanced ligo for mergers of compact binary systems. the pipeline incorporates different techniques and makes independent implementation choices in all its stages including the se... | new search pipeline for compact binary mergers: results for binary black holes in the first observing run of advanced ligo |
during its first four months of taking data, advanced ligo has detected gravitational waves from two binary black hole mergers, gw150914 and gw151226, along with the statistically less significant binary black hole merger candidate lvt151012. here we use the rapid binary population synthesis code compas to show that al... | formation of the first three gravitational-wave observations through isolated binary evolution |
we give explicit expressions for the finite frequency greybody factor, quasinormal modes, and love numbers of kerr black holes by computing the exact connection coefficients of the radial and angular parts of the teukolsky equation. this is obtained by solving the connection problem of the confluent heun equation in te... | exact solution of kerr black hole perturbations via cft2 and instanton counting: greybody factor, quasinormal modes, and love numbers |
scalar metric fluctuations generically source a spectrum of gravitational waves at second order in perturbation theory, poising gravitational wave experiments as potentially powerful probes of the small-scale curvature power spectrum. we perform a detailed study of the imprint of primordial non-gaussianity on these ind... | non-gaussianity and the induced gravitational wave background |
several recent works [1-3] have claimed that the weak gravity conjecture (wgc) excludes super-planckian displacements of axion fields, and hence large-field axion inflation, in the absence of monodromy. we argue that in theories with n ≫ 1 axions, super-planckian axion diameters d are readily allowed by the wgc. we cla... | planckian axions and the weak gravity conjecture |
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