Latest in gr-qc

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Perturbative Algebraic Quantum Field Theory on Quantum Spacetime: Adiabatic and Ultraviolet ConvergenceJun 13 2019The quantum structure of Spacetime at the Planck scale suggests the use, in defining interactions between fields, of the Quantum Wick product. The resulting theory is ultraviolet finite, but subject to an adiabatic cutoff in time which seems difficult ... More
Static Spherically Symmetric Einstein-aether models: Integrability and the Modified Tolman-Oppenheimer-Volkoff approachJun 13 2019We study the evolution of the dynamics and the existence of analytic solutions for the field equations in the Einstein-aether theory for a static spherically symmetric spacetime. In particular, we investigate if the gravitational field equations in the ... More
A HERO for general relativityJun 13 2019HERO (Highly Eccentric Relativity Orbiter) is a space-based mission concept aimed to perform several tests of post-Newtonian gravity around the Earth with a preferably drag-free spacecraft moving along a highly elliptical path fixed in its plane undergoing ... More
Cosmological perfect fluids in Gauss-Bonnet gravityJun 13 2019In an $n$-dimensional Friedmann-Robertson-Walker metric, it is rigorously shown that any smooth theory of gravity $f(R,{\cal G})$, where $R$ is the curvature scalar and $\cal G$ is the Gauss-Bonnet topological invariant, can be associated to a perfect-fluid ... More
Towards Gaussian states for loop quantum gravityJun 13 2019An important challenge in loop quantum gravity is to find semiclassical states - states that are as close to classical as quantum theory allows. This is difficult because the states in the Hilbert space used in LQG are excitations over a vacuum in which ... More
Semiclassical Behavior of Spinfoam Amplitude with Small Spins and Entanglement EntropyJun 13 2019Spinfoam amplitudes with small spins can have interesting semiclassical behavior and relate to semiclassical gravity and geometry in 4 dimensions. We study the generalized spinfoam model (Spinfoams for all loop quantum gravity (LQG)) with small spins ... More
Dark range of $ω$ in Brans-Dicke gravityJun 13 2019The variational field equations of Brans-Dicke scalar-tensor theory of gravitation are presented in a Riemannian and non-Riemannian setting in the language of exterior differential forms over 4-dimensional spacetime. In Rosen coordinates, the equations ... More
Eikonal quasinormal modes of black holes beyond General RelativityJun 13 2019Much of our physical intuition about black hole quasinormal modes in General Relativity comes from the eikonal/geometric optics approximation. According to the well-established eikonal model, the fundamental quasinormal mode represents wavepackets orbiting ... More
Fine Tuning Problem of the Cosmological Constant in a Generalized Randall-Sundrum ModelJun 13 2019To solve the cosmological constant fine tuning problem, we investigate a $(n+1)$-dimensional generalized Randall-Sundrum brane world scenario with a bulk cosmological constant. The induced cosmological constant on the visible brane appear naturally. For ... More
Can the quantum vacuum fluctuations really solve the cosmological constant problem?Jun 12 2019Recently it has been argued that a correct reading of the quantum fluctuations of the vacuum could lead to a solution to the cosmological constant problem. In this work we critically examine such a proposal, finding it questionable due to conceptual and ... More
A generalized Weyl structure with arbitrary non-metricityJun 12 2019A Weyl structure is usually defined by an equivalence class of pairs $({\bf g}, \boldsymbol{\omega})$ related by Weyl transformations, which preserve the relation $\nabla {\bf g}=\boldsymbol{\omega}\otimes{\bf g}$, where ${\bf g}$ and $\boldsymbol{\omega}$ ... More
Asymptotically flat spinning scalar, Dirac and Proca starsJun 12 2019Einstein's gravity minimally coupled to free, massive, classical fundamental fields admits particle-like solutions. These are asymptotically flat, everywhere non-singular configurations that realise Wheeler's concept of a geon: a localised lump of self-gravitating ... More
Dynamical Friction in Interacting Relativistic SystemsJun 12 2019We study dynamical friction in interacting relativistic systems with arbitrary mean free paths and medium constituent masses. Our novel framework recovers the known limits of ideal gas and ideal fluid when the mean free path goes to infinity or zero, ... More
Can Life Exist in 2 + 1 Dimensions?Jun 12 2019There are anthropic reasons to suspect that life in more than three spatial dimensions is not possible, and if the same could be said of fewer than three, then one would have an anthropic argument for why we experience precisely three large spatial dimensions. ... More
Emergent de Sitter epoch of the Loop Quantum Cosmos: a detailed analysisJun 12 2019We present a detailed analysis of a quantum model for Loop Quantum Cosmology based on strict application of the Thiemann regularization algorithm for the Hamiltonian in Loop Quantum Gravity, extending the results presented previously in our brief report. ... More
Liouville description of conical defects in dS$_4$, Gibbons-Hawking entropy as modular entropy, and dS$_3$ holographyJun 12 2019We model the back-reaction of a massive static observer in four-dimensional de Sitter spacetime by means of a singular $\mathbb Z_q$ quotient. The set of fixed points of the $\mathbb Z_q$ action consists of a pair of codimension two minimal surfaces given ... More
The Orbital Lense-Thirring Precession in a Strong FieldJun 12 2019We study the exact evolution of the orbital angular momentum of a massive particle in the gravitational field of a Kerr black hole. We show analytically that, for a wide class of orbits, the angular momentum's hodograph is always close to a circle. This ... More
Primordial dark matter halos from fifth-forcesJun 12 2019We argue that primordial dark matter halos could be generated during radiation domination by long range attractive forces stronger than gravity. In this paper we derive the conditions under which these structures could dominate the dark matter content ... More
Ignorance is Cheap: From Black Hole Entropy To Energy-Minimizing States In QFTJun 12 2019Behind certain marginally trapped surfaces one can construct a geometry containing an extremal surface of equal, but not larger area. This construction underlies the Engelhardt-Wall proposal for explaining Bekenstein-Hawking entropy as a coarse-grained ... More
Escape speed of stellar clusters from multiple-generation black-hole mergers in the upper mass gapJun 12 2019Pair instabilities in supernovae might prevent the formation of black holes with masses between ~50 $M_\odot$ and ~130 $M_\odot$. Multiple generations of black-hole mergers provide a possible way to populate this "mass gap'' from below. However this requires ... More
Binary neutron star mergers: effects of spin and post-merger dynamicsJun 12 2019Spin can have significant effects on the electromagnetic transients accompanying binary neutron star mergers. The measurement of spin can provide important information about binary formation channels. In the absence of a strong neutron star spin prior, ... More
$\mathcal{PT}$-symmetric quantum field theory on the noncommutative spacetimeJun 12 2019We consider the $\mathcal{PT}$-symmetric quantum field theory on the noncommutative spacetime with angular twist and construct its pseudo-Hermitian interpretation. We explore the differences between the internal and spatial parities in the context of ... More
AdS and the SwamplandJun 12 2019We study aspects of anti-de Sitter space in the context of the Swampland. In particular, we conjecture that the near-flat limit of pure AdS belongs to the Swampland, as it is necessarily accompanied by an infinite tower of light states. The mass of the ... More
Post-Minkowskian Hamiltonians in Modified Theories of GravityJun 12 2019The aim of this note is to describe the computation of post-Minkwoskian Hamiltonians in modified theories of gravity. Exploiting a recent relation between amplitudes of massive scalars and Hamiltonians for relativistic point-particles, we define a post-Minkowskian ... More
The Odd-Parity Galaxy BispectrumJun 12 2019The galaxy bispectrum contains a wealth of information about the early universe, gravity, as well as astrophysics such as galaxy bias. In this paper, we study the parity-odd part of the galaxy bispectrum which is hitherto unexplored. In the standard cosmological ... More
Galactic rotation curves in Einstein's conformal gravityJun 12 2019We show quantitatively that an exact solution of Einstein's conformal gravity can explain very well the galactic rotation curves for a sample of 104 galaxies without need for dark matter or other exotic modification of gravity. The metric is an overall ... More
On the kinematics of large-scale peculiar motionsJun 12 2019We consider the linear kinematics of large-scale peculiar motions in a perturbed Friedmann universe. In so doing, we introduce a 4-velocity "tilt", relative to the smooth Hubble expansion, and take the view point of the "real" observes that move along ... More
Parametrized black hole quasinormal ringdown. II. Coupled equations and quadratic corrections for nonrotating black holesJun 12 2019Linear perturbations of spherically symmetric spacetimes in general relativity are described by radial wave equations, with potentials that depend on the spin of the perturbing field. In previous work we studied the quasinormal mode spectrum of spacetimes ... More
Rindler horizons in the Schwarzschild spacetimeJun 12 2019We investigate the past and future Rindler horizons for radial Rindler trajectories in the Schwarzschild spacetime. We assume the Rindler trajectory to be linearly uniformly accelerated (LUA) throughout its motion, in the sense of the curved spacetime ... More
Analytic solutions for parallel transport along generic bound geodesics in Kerr spacetimeJun 12 2019We provide analytical closed form solutions for the parallel transport along a bound geodesic in Kerr spacetime. This can be considered the lowest order approximation for the motion a spinning black hole in an extreme mass-ratio inspiral. As an illustration ... More
Asymmetric shockwave collisions in $\text{AdS}_{5}$Jun 12 2019Collisions of asymmetric planar shocks in maximally supersymmetric Yang-Mills theory are studied via their dual gravitational formulation in asymptotically anti-de Sitter spacetime. The post-collision hydrodynamic flow is found to be very well described ... More
The Discovery of Six Recycled Pulsars from the Arecibo 327-MHz Drift-Scan Pulsar SurveyJun 12 2019Recycled pulsars are old ($\gtrsim10^{8}$ yr) neutron stars that are descendants from close, interacting stellar systems. In order to understand their evolution and population, we must find and study the largest number possible of recycled pulsars in ... More
Lensing anomalies from the epoch of reionisationJun 12 2019Reionisation blurring is a non-linear correction to the cosmic microwave background that acts similar to weak gravitational lensing and that can be computed from linear perturbations through a blurring potential. Its impact on the cosmic microwave background ... More
A note on the symplectic structure of asymptotically flat gravity and BMS symmetriesJun 12 2019The Poisson brackets of the gravitational field at null infinity play a pivotal role in establishing the equivalence between the Ward identities involving BMS charges and the soft graviton theorem. In recent literature it was noticed that, in order to ... More
Partner formula for an arbitrary moving mirror in $1+1$ dimensionJun 12 2019In the information loss problem in black hole evaporation, investigation of the purification partner of a Hawking particle is crucial. It is a well-known fact that 3+1 dimensional spherically symmetric gravitational collapse can be approximately described ... More
Shadows and deflection angle of charged and slowly rotating black holes in Einstein-Æther theoryJun 12 2019In this paper, we study the shadow cast by two types of charged and slowly rotating black holes in Eisntein-aether theory of gravity. This two types of black holes are corresponding to two specific combinations of the coupling constants of the aether ... More
Strong Chaos of Fast Scrambling Yields Order: Emergence of Decoupled Quantum Information CapsulesJun 12 2019The information loss problem in black hole evaporation is one of fundamental issues. Its resolution requires more profound understanding of information storage mechanism in quantum systems. In this Letter, we argue that when multiple unknown parameters ... More
Gravitational scalar field with a RAQUAL-like cubic kinetic term and second order self-interactionJun 12 2019The consequences of two unorthodox contributions to the Lagrangian of a (real valued) relativistic scalar field are studied: a cubic kinetic term similar to the "a-quadratic" Lagrangian used in the first attempt of a covariant generalization of Milgrom's ... More
Coordinate independent approach to the calculation of the effects of local structure on the luminosity distanceJun 12 2019Local structure can have important effects on luminosity distance observations, which could for example affect the local estimation of the Hubble constant based on low red-shift type Ia supernovae. Using a spherically symmetric exact solution of the Eistein's ... More
Relativistic wind accretion on to a Schwarzschild black holeJun 12 2019We present a novel analytic model of relativistic wind accretion on to a Schwarzschild black hole. This model constitutes a general relativistic extension of the classical model of wind accretion by Bondi, Hoyle, and Lyttleton (BHL). As in BHL, this model ... More
On the quantum Geroch groupJun 11 2019The Geroch group is an infinite dimensional transitive group of symmetries of cylindrically symmetric gravitational waves which acts by non-canonical transformations on the phase space of these waves. The unique Poisson bracket on the Geroch group which ... More
On the balance problem for two rotating and charged black holesJun 11 2019It is an interesting open problem whether two non-extremal rotating and electrically charged black holes can be in physical equilibrium, which might be possible due to a balance between the gravitational attraction and the spin-spin and electrical repulsions. ... More
Electromagnetic fields on Kerr spacetime, Hertz potentials and Lorentz gaugeJun 11 2019We review two procedures for constructing the vector potential of the electromagnetic field on Kerr spacetime, namely, the classic method of Cohen & Kegeles, yielding $A^\mu$ in a radiation gauge, and the newer method of Frolov et al., yielding $A^\mu$ ... More
Generalized Proca and its Constraint AlgebraJun 11 2019We reconsider the construction of general derivative self-interactions for a massive Proca field. The constructed Lagrangian is such that the vector field propagates at most three degrees of freedom, thus avoiding the ghostly nature of a fourth polarisation. ... More
Quantization of dynamical symplectic reductionJun 11 2019A long-standing problem in quantum gravity and cosmology is the quantization of systems in which evolution is generated by a constraint that must vanish on solutions. Here, an algebraic formulation of this problem is presented, together with new structures ... More
B-mode TargetsJun 11 2019The CMB-S4 Science Book, Astro2020 Science White Paper on gravitational waves, and PICO report contain an extensive discussion of many ongoing and planned efforts in the search for gravitational waved produced by inflation. Here we give a short executive ... More
Asymmetric nonsingular bounce from a dynamic scalar fieldJun 11 2019We present a dynamical model for an asymmetric nonsingular bounce with a post-bounce change of the effective equation-of-state parameter. Specifically, we consider a scalar-field model with a time-reversal-noninvariant effective potential.
Comment (2) on "Quantum Transfiguration of Kruskal Black Holes"Jun 11 2019An explicit calculation shows that the model constructed in arXiv:1806.00648 violates general covariance. It is therefore unphysical and does not determine properties of space-time or black holes.
Minimum main sequence mass in quadratic Palatini $f(\mathcal{R})$ gravityJun 11 2019General Relativity yields an analytical prediction of a minimum required mass of roughly $\sim 0.08-0.09 M_{\odot}$ for a star to stably burn sufficient hydrogen to fully compensate photospheric losses and, therefore, to belong to the main sequence. Those ... More
New scalar compact objects in Ricci-based gravity theoriesJun 11 2019Taking advantage of a previously developed method, which allows to map solutions of General Relativity into a broad family of theories of gravity based on the Ricci tensor (Ricci-based gravities), we find new exact analytical scalar field solutions by ... More
Towards an UV fixed point in CDT gravityJun 11 2019CDT is an attempt to formulate a non-perturbative lattice theory of quantum gravity. We describe the phase diagram and analyse the phase transition between phase B and phase C (which is the analogue of the de Sitter phase observed for the spherical spatial ... More
Exploring universality in neutron star mergersJun 11 2019We explore the correlation between the pre-merger tidal deformability and the post-merger remnant oscillations seen in numerical simulation of neutron star binaries, with the aim of understanding to what extent the physics support the existence of such ... More
Testing the gravitational field generated by a quantum superpositionJun 11 2019What gravitational field is generated by a massive quantum system in a spatial superposition? Despite decades of intensive theoretical and experimental research, we still do not know the answer. On the experimental side, the difficulty lies in the fact ... More
Near horizon symmetries, emergence of Goldstone modes and thermalityJun 11 2019Quantum mechanically horizons are believed to be thermal in nature for a long time. The microscopic origin of this thermality is the main question behind our present investigation, which reveals possible importance of near horizon symmetry. It is this ... More
Dynamical System Analysis of Brane Induced Gravity with Tachyon FieldJun 11 2019In this manuscript we use the dynamical system approach to study the linear dynamics of a normal DGP brane-world model with a tachyon field as the dark energy component. Our focus is on a Gaussian tachyonic potential in which the parameter $\lambda=-V_\phi/V^{3/2}$, ... More
Shadow of a rotating squashed Kaluza-Klein black holeJun 11 2019We have studied the shadow of a rotating squashed Kaluza-Klein (KK) black hole and find that the shadow possesses some distinct properties from those of usual rotating black holes. Our result shows that the shadow shape is a perfect black disk for the ... More
Anisotropic evolution of 4-brane in a 6D generalized Randall-Sundrum modelJun 11 2019We investigate a 6d generalized Randall-Sundrum brane world scenario with a bulk cosmological constant. It is shown that each stress-energy tensor $T_{ab}^{i}$ on the brane is similar to a constant vacuum energy. This is consistent with the Randall-Sundrum ... More
Observational Tests of Gauss-Bonnet Like Dark Energy ModelJun 11 2019The consistency of some dynamical dark energy models based on Gauss-Bonnet invariant, ${\cal G}$, is studied compared with cosmological observational tests. The investigated models are modified form of Gauss Bonnet dark energy, MGB-DE and two other versions ... More
Quantum satellites and tests of relativityJun 11 2019Deployment of quantum technology in space provides opportunities for new types of precision tests of gravity. On the other hand, the operational demands of such technology can make previously unimportant effects practically relevant. We describe a novel ... More
A cosmic shadow on CSLJun 11 2019The Continuous Spontaneous Localisation (CSL) model solves the measurement problem of standard quantum mechanics, by coupling the mass density of a quantum system to a white-noise field. Since the mass density is not uniquely defined in general relativity, ... More
(2+1)-dimensional Static Cyclic Symmetric Traversable Wormhole: Quasinormal Modes and CausalityJun 11 2019In this paper we study a static cyclic symmetric traversable wormhole in $(2+1)-$dimensional gravity coupled to nonlinear electrodynamics in anti-de Sitter spacetime. The solution is characterized by three parameters: mass $M$, cosmological constant $\Lambda$ ... More
Inflation in the general Poincaré gauge cosmologyJun 11 2019The general Poincar\'e gauge cosmology given by a nine-parameter gravitational Lagrangian is studied from the perspective of field theory. By introducing transformations on two (pseudo-) scalar torsions, the Poincar\'e gauge cosmological system can be ... More
Gravitational-wave detection rates for compact binaries formed in isolation: LIGO/Virgo O3 and beyondJun 10 2019Using simulations performed with the population synthesis code MOBSE, we compute the merger rate densities and detection rates of compact binary mergers formed in isolation for second- and third-generation gravitational-wave detectors. We estimate how ... More
Any extremal black holes are primordialJun 10 2019Extremal Kerr black holes, if they exist, cannot have an astrophysical origin due to the Thorne limit $a<a^*_{\rm lim}=0.998$. However this limit can be evaded if they are primordial and subject to evaporation by Hawking radiation. We derive the lower ... More
Challenging bulk viscous unified scenarios with cosmological observationsJun 10 2019In a spatially flat Friedmann-Lema\^{i}tre-Robertson-Walker universe, we investigate a unified cosmic fluid scenario endowed with bulk viscosity in which the coefficient of the bulk viscosity has a power law evolution. The power law in the bulk viscous ... More
Shadow of rotating charged black hole with Weyl correctionsJun 10 2019We construct theoretical investigation of the black hole shadow for rotating charged black hole in an asymptotically flat, axisymmetric, and stationary spacetime with Weyl corrections. This spacetime is characterized by mass ($M$), charge parameter ($q$), ... More
Testing dark energy models with a new sample ofstrong-lensing systemsJun 10 2019Inspired by a new compilation of strong lensing systems (SLS), which consist of 205 points in the redshift range $0.0625< z_{l} < 0.958$ for the lens galaxy and $0.196< z_{s} < 3.595$ for the source, we constrain three models that generate a late cosmic ... More
Unique contributions to the scalar bispectrum in `just enough inflation'Jun 10 2019A scalar field rolling down a potential with a large initial velocity results in inflation of a finite duration. Such a scenario suppresses the scalar power on large scales improving the fit to the cosmological data. We find that the scenario leads to ... More
Loop quantum cosmology from an alternative HamiltonianJun 10 2019In this paper a new Hamiltonian constraint operator for loop quantum cosmology is constructed by using the Chern-Simons action. The quantum dynamics of the $k=0$ cosmological model with respect to a massless scalar field as an emergent time is determined ... More
Dynamics of Einstein-Aether Scalar field CosmologyJun 10 2019We study the cosmological evolution of the field equations in the context of Einstein-Aether cosmology by including a scalar field in a spatially flat Friedmann--Lema\^{\i}tre--Robertson--Walker spacetime. Our analysis is separated into two separate where ... More
Astrophysical Black Holes: A ReviewJun 10 2019In this review, I have tried to focus on the development of the field, from the first speculations to the current lines of research. According to Einstein's theory of general relativity, black holes are relatively simple objects and completely characterized ... More
Gravitational perturbations as $T\bar{T}$-deformations in 2D dilaton gravity systemsJun 10 2019We consider gravitational perturbations of 2D dilaton gravity systems and show that these can be recast into $T\bar{T}$-deformations (at least) under certain conditions, where $T$ means the energy-momentum tensor of the matter field coupled to a dilaton ... More
Phantom energy versus cosmological constant: Comparative results via analytical solutions of the Wheeler-DeWitt equationJun 10 2019In the present paper we investigate how the phantom class of dark energy, presumably responsible for a super-accelerated cosmic expansion and here described by the state parameter $\omega=-5/3$, influences the wave function of the Universe. This is done ... More
Scalar radiation from a source rotating around a regular black holeJun 10 2019The scalar radiation emitted by a source in geodesic circular orbit around a regular Bardeen black hole is analyzed. We use the quantum field theory in curved spacetime framework to obtain the emitted power of radiation by computing the one-particle emission ... More
Puzzling out the mass-superselection ruleJun 09 2019Mass-superselection rule (MSR) states that in the non-relativistic quantum theory superpositions of states with different masses are unphysical. While MSR features even in textbooks, its validity, physical content and consequences remain debated. Its ... More
Accretion of perfect fluids onto a class of regular black holesJun 09 2019We consider the stationary spherical accretion process of perfect fluids onto a class of spherically symmetric regular black holes corresponding to quantum-corrected Schwarzschild spacetimes. We show that the accretion rates can differ from the Schwarzschild ... More
Testing the weak equivalence principle by differential measurements of fundamental constants in the Magellanic CloudsJun 09 2019Non-standard fields are assumed to be responsible for phenomena attributed to dark energy and dark matter. Being coupled to ordinary matter, these fields modify the masses and/or charges of the elementary particles, thereby violating the Weak Equivalence ... More
A Local Resolution of the Problem of Time. IX. Spacetime ConstructabilityJun 09 2019Assuming Temporal and Configurational Relationalism, GR as Geometrodynamic's DeWitt supermetric alongside local Lorentzian Relativity with its universal finite maximum propagation speed arises as one of very few options from Feeding Families through a ... More
A Local Resolution of the Problem of Time. VII. Constraint ClosureJun 09 2019We now set up Constraint Closure in a manner consistent with Temporal and Configurational Relationalism. This requires modifying the Dirac Algorithm - which addresses the Constraint Closure Problem facet of the Problem of Time piecemeal - to the TRi-Dirac ... More
Gravitational Perturbations in a cavity: NonlinearitiesJun 09 2019Motivated by recent studies of nonlinear perturbations of asymptotically anti-de Sitter spacetimes, we study gravitational perturbations of $(n+2)$ dimensional Minkowski spacetime with a spherical Dirichlet wall. By considering the tensor, vector and ... More
A Local Resolution of the Problem of Time. VI. Combining Temporal and Configurational Relationalism for Field Theories and GRJun 09 2019We next combine Temporal and Configurational Relationalism's resolution for Field Theory, including in particular for GR. The current Article also provides the finite-and-field theory portmanteau notation, by which the rest of this series' reworking of ... More
A Local Resolution of the Problem of Time. V. Combining Temporal and Configurational Relationalism for Finite TheoriesJun 09 2019As we have known comprehensively since the early 1990's works of Isham and Kucha\v{r}, The Problem of Time mostly concerns interferences between its many facets. Having introduced the local facets in Articles I to IV, we now show how Article I's approach ... More
Nonlocality amplifies echoesJun 09 2019In this paper we will provide smoking-gun signatures of nonlocal interactions while studying reflection and transmission of waves bouncing through two Dirac delta potentials. In particular, we will show that the transmission of waves is less damped compared ... More
Scale independent $R^2$ inflationJun 08 2019Weyl (scale) invariant theories of scalars and gravity can generate all mass scales spontaneously. In this paper we study a particularly simple version -- scale invariant $R^2$ gravity -- and show that, during an inflationary period, it leads to fluctuations ... More
Finely Split Phase Transitions of Rotating and Accelerating Black HolesJun 08 2019We investigate the thermodynamic phase behaviour of rotating and slowly accelerating AdS black holes. While we find some similarities with the non-rotating charged counterparts, such as the peculiar phenomena of "snapping swallow tails" we also find subtle ... More
Testing dissipative dark matter in causal thermodynamicsJun 07 2019In this paper we study the consistency of a cosmological model, described by a novel exact analytic solution of a universe filled with a dissipative dark matter fluid, in the framework of the causal Israel-Stewart theory, testing it by using Type Ia Supernovae ... More
Photon sphere and reentrant phase transition of charged Born-Infeld-AdS black holesJun 07 2019In this paper, we extend the study of the relationship between the photon sphere and the thermodynamic phase transition, especially the reentrant phase transition, to this black hole background. According to the number of the thermodynamic critical points, ... More
On the Differentiation Lemma and the Reynolds Transport Theorem for Manifolds with CornersJun 07 2019We state and prove generalizations of the Differentiation Lemma and the Reynolds Transport Theorem in the general setting of smooth manifolds with corners (e.g. cuboids, spheres, $\mathbb{R}^n$, simplices). Several examples of manifolds with corners are ... More
Phantom fluid wormhole in $f(R,T)$ gravityJun 07 2019Wormholes (WHs) are considered as hypothetical shortcuts or tunnels in spacetime. In general relativity (GR), the fundamental ingredient of WH geometry is the presence of exotic matter at the throat, which is responsible for the violation of null energy ... More
Evolution of black hole shadow in the presence of ultralight bosonsJun 07 2019The possible occurence of ultralight boson clouds around Kerr black holes has attracted a lot of interest. In this work, we determine the signatures of boson cloud evolution in the shadow of a black hole. We assess the detectability of such variations ... More
Properties of fluctuating states in loop quantum cosmologyJun 07 2019In loop quantum cosmology, the values of volume fluctuations and correlations determine whether the dynamics of an evolving state exhibits a bounce. Of particular interest are states that are supported only on either the positive or the negative part ... More
Thermodynamics of relativistic multifluidsJun 07 2019The internal layers of neutron stars are expected to contain several superfluid components that can significantly affect their dynamics. The description of such objects should rely on hydrodynamic models in which it is possible to unambiguously assign ... More
(Transient) Scalar Hair for (Nearly) Extreme Black HolesJun 07 2019It has been shown recently that extreme Reissner-Nordstr\"{o}m black holes perturbed by a minimally coupled, free, massless scalar field have permanent scalar hair. The hair - defined by a certain expression at future null infinity - approaches a conserved ... More
An adaptive scheduling tool to optimize measurements to reach a scientific objective: methodology and application to the measurements of stellar orbits in the Galactic CenterJun 07 2019In various fields of physics and astronomy, access to experimental facilities or to telescopes is becoming more and more competitive and limited. It becomes therefore important to optimize the type of measurements and their scheduling to reach a given ... More
GINGERJun 07 2019GINGER (Gyroscopes IN GEneral Relativity), based on an array of large dimension ring laser gyroscopes, is aiming at measuring in a ground laboratory the gravito-electric and gravito-magnetic effects (also known as De Sitter and Lense-Thirrings effect), ... More
Is the Cosmological Constant of Topological Origin?Jun 07 2019The observed value of the cosmological constant poses large theoretical problems. We find that topology of the Universe provides a natural source for it. Restricting dynamically an Einstein-Cartan gravity to General Relativity in our observed Universe ... More
Scale Factors of Homogeneous Anisotropic Cosmological Models with Perfect FluidJun 07 2019The article is devoted to cosmology. It deals with homogeneous anisotropic cosmological models. Scale factors have been evaluated for the multicomponent models with perfect fluid, taking account of its expansion, rotation and shear. The cosmological fluid ... More
Tensor networks for quantum causal historiesJun 07 2019In this paper, we construct a tensor network representation of quantum causal histories, as a step towards directly representing states in quantum gravity via bulk tensor networks. Quantum causal histories are quantum extensions of causal sets in the ... More
Black hole quantum atmosphere for freely falling observersJun 07 2019We analyze Hawking radiation as perceived by a freely-falling observer and try to draw an inference about the region of origin of the Hawking quanta. To do so, first we calculate the energy density from the stress energy tensor, as perceived by a freely-falling ... More
Multi-waveform cross-correlation search method for intermediate-duration gravitational waves from gamma-ray burstsJun 06 2019Gamma-ray Bursts (GRBs) are flashes of gamma-rays thought to originate from rare forms of massive star collapse (long GRBs), or from mergers of compact binaries (short GRBs) containing at least one neutron star (NS). The nature of the post-explosion / ... More