General Relativity and Quantum Cosmology
New submissions
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New submissions for Thu, 2 May 24
- [1] arXiv:2405.00116 [pdf, ps, other]
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Title: Alternate Computation of Gravitational Effects from a Single Loop of Inflationary ScalarsComments: 59 pages, 3 figures, 23 tables, uses LaTeX2eSubjects: General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Theory (hep-th)
We present a new computation of the renormalized graviton self-energy induced by a loop of massless, minimally coupled scalars on de Sitter background. Our result takes account of the need to include a finite renormalization of the cosmological constant, which was not included in the first analysis. We also avoid preconceptions concerning structure functions and instead express the result as a linear combination of 21 tensor differential operators. By using our result to quantum-correct the linearized effective field equation we derive logarithmic corrections to both the electric components of the Weyl tensor for gravitational radiation and to the two potentials which quantify the gravitational response to a static point mass.
- [2] arXiv:2405.00170 [pdf, other]
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Title: Self-force framework for transition-to-plunge waveformsComments: 87 pages, 13 figuresSubjects: General Relativity and Quantum Cosmology (gr-qc)
Compact binaries with asymmetric mass ratios are key expected sources for next-generation gravitational wave detectors. Gravitational self-force theory has been successful in producing post-adiabatic waveforms that describe the quasi-circular inspiral around a non-spinning black hole with sub-radian accuracy, in remarkable agreement with numerical relativity simulations. Current inspiral models, however, break down at the innermost stable circular orbit, missing part of the waveform as the secondary body transitions to a plunge into the black hole. In this work we derive the transition-to-plunge expansion within a multiscale framework and asymptotically match its early-time behaviour with the late inspiral. Our multiscale formulation facilitates rapid generation of waveforms: we build second post-leading transition-to-plunge waveforms, named 2PLT waveforms. Although our numerical results are limited to low perturbative orders, our framework contains the analytic tools for building higher-order waveforms consistent with post-adiabatic inspirals, once all the necessary numerical self-force data becomes available. We validate our framework by comparing against numerical relativity simulations, surrogate models and the effective one-body approach.
- [3] arXiv:2405.00278 [pdf, ps, other]
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Title: Beyond Schwarzschild: New Pulsating Coordinates for Spherically Symmetric MetricsComments: 17 pages, 4 figures. Preliminar result was presented in GRG23 Conference (China, 2022). Find the published version (DOI below), improving interpretations and a result about AdS Spacetime in: this https URLJournal-ref: Gen Relativ Gravit 56, 35 (2024)Subjects: General Relativity and Quantum Cosmology (gr-qc); Mathematical Physics (math-ph)
Starting from a general transformation for spherically symmetric metrics where g\_11=-1/g\_00, we analyze coordinates with the common property of conformal flatness at constant solid angle element. Three general possibilities arise: one where tortoise coordinate appears as the unique solution, other that includes Kruskal-Szekeres coordinates as a very specific case, but that also allows other similar transformations, and finally a new set of coordinates with very different properties than the other two. In particular, this represents any causal patch of the spherically symmetric metrics in a compactified form. We analyze some relations, taking the Schwarzschild case as prototype, but also contrasting the cosmological de-Sitter and Anti-de-Sitter solutions for the new proposed pulsating coordinates.
- [4] arXiv:2405.00374 [pdf, ps, other]
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Title: Study of Charged Cylindrical Collapse in $f(\mathcal{R},\mathcal{T},\mathcal{Q})$ GravityComments: 25 pages, no figureJournal-ref: Chin. J. Phys. 85(2023)41-53Subjects: General Relativity and Quantum Cosmology (gr-qc)
This paper investigates the effects of electromagnetic field on the gravitational collapse in $f(\mathcal{R},\mathcal{T},\mathcal{Q})$ theory, where $\mathcal{Q} = \mathcal{R}_{\varphi\vartheta} \mathcal{T}^{\varphi\vartheta}$. For this, we assume dynamical cylindrically symmetric self-gravitating geometry which is coupled with generalized anisotropic matter distribution as well as dissipation flux. We adopt the model $\mathcal{R}+\Phi\sqrt{\mathcal{T}}+\Psi\mathcal{Q}$ to formulate the corresponding dynamical and transport equations by employing the Misner-Sharp as well as M\"{u}ler-Israel Stewart formalisms, where $\Phi$ and $\Psi$ are real-valued coupling constants. The influence of state variables, heat dissipation, charge and the bulk viscosity on the collapsing phenomenon is then studied by establishing some relations between these evolution equations. Moreover, the Weyl scalar and the modified field equations are expressed in terms of each other. We apply some constraints on the considered modified model and the fluid configuration to obtain conformally flat spacetime. Finally, we address different cases to check how the modified corrections and charge affect the collapse rate of cylindrical matter source.
- [5] arXiv:2405.00403 [pdf, ps, other]
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Title: Maximal acceleration in Rainbow gravityComments: 12 pagesSubjects: General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Theory (hep-th)
In this paper, we derive maximal acceleration of a massive particle in Rainbow gravity. Using eight-dimensional phase-space metric compatible with Rainbow gravity, we obtain the maximal acceleration, valid up to first order in the Rainbow gravity parameter $\eta$. Using the positivity condition on maximal acceleration, we find the upper bound on the Rainbow gravity parameter is of the order of $~10^{22}$ for positron and $10^{-44}$ for a black hole. After obtaining the expression for maximal acceleration for different choices of Rainbow functions, we derive corresponding modifications to Unruh temperature. Comparing with the observational value of the Unruh temperature, we find the upper bound on $\eta$ as $~10^{32}$ for positron radiation. %and of the order of $10^{-100}$ for radiation from a black hole. We then derive geodesic equations for different choices of Rainbow functions and also obtain Newtonian limit of these geodesic equations. We find that the changes in the value of maximum acceleration, maximum temperature and Newtonian force equation are dependent on the choices of Rainbow functions.
- [6] arXiv:2405.00594 [pdf, other]
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Title: Anomalous diffusion and factor ordering in (1+1)-dimensional Lorentzian quantum gravitySubjects: General Relativity and Quantum Cosmology (gr-qc); Mathematical Physics (math-ph)
Using properties of diffusion according to a quantum heat kernel constructed as an expectation over classical heat kernels on $S^1$, we probe the non-manifold-like nature of quantized space in a model of (1+1)-dimensional quantum gravity. By computing the mean squared displacement of a diffusing particle, we find that diffusion is anomalous, behaving similarly to that on a porous substrate, network, or fractal over short distances. The walk dimension of the path for a particle diffusing in quantized space is calculated to have an infimum of 4, rising to arbitrarily large values depending on a parameter labeling the choice of factor ordering in the quantum Hamiltonian for our model and figuring in the asymptotic behavior of the wavefunction used to construct the quantum heat kernel. Additionally, we derive an expansion for return probability of a diffusing particle, whose modifications from the classical power-series form depend on the factor-ordering parameter.
- [7] arXiv:2405.00661 [pdf, other]
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Title: Towards quantum gravity with neural networks: Solving quantum Hamilton constraints of 3d Euclidean gravity in the weak coupling limitComments: 46 pages, 14 figuresSubjects: General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Theory (hep-th); Computational Physics (physics.comp-ph)
We consider 3-dimensional Euclidean gravity in the weak coupling limit of Smolin and show that it is BF-theory with $\text{U(1)}^3$ as a Lie group. The theory is quantised using loop quantum gravity methods. The kinematical degrees of freedom are truncated, on account of computational feasibility, by fixing a graph and deforming the algebra of the holonomies to impose a cutoff on the charge vectors. This leads to a quantum theory related to $\text{U}_q \text{(1)}^3$ BF-theory. The effect of imposing the cutoff on the charges is examined. We also implement the quantum volume operator of 3d loop quantum gravity. Most importantly we compare two constraints for the quantum model obtained: a master constraint enforcing curvature and Gauss constraint, as well as a combination of a quantum Hamilton constraint constructed using Thiemann's strategy and the Gauss master constraint. The two constraints are solved using the neural network quantum state ansatz, demonstrating its ability to explore models which are out of reach for exact numerical methods. The solutions spaces are quantitatively compared and although the forms of the constraints are radically different, the solutions turn out to have a surprisingly large overlap. We also investigate the behavior of the quantum volume in solutions to the constraints.
Cross-lists for Thu, 2 May 24
- [8] arXiv:2405.00072 (cross-list from astro-ph.HE) [pdf, other]
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Title: Role of local anisotropy in hybrid starsComments: 13 pages. Comments are Welcome :). arXiv admin note: text overlap with arXiv:2312.00310Subjects: High Energy Astrophysical Phenomena (astro-ph.HE); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Phenomenology (hep-ph); Nuclear Theory (nucl-th)
Using the Bower-Liang model, we discuss how pressure anisotropies affect the microscopic and macroscopic properties of hybrid stars. We find that anisotropies affect the maximum mass, central density, and radius of the canonical stars. Anisotropies also affect the minimum neutron star mass that presents quarks in their core, as well as the total amount of quarks for the maximally massive stars. We also confront our results with standard constraints, such as the radius and the tidal parameter of the canonical star, as well as the mass and radius of the PSR J0740+6620 pulsar. We observe that moderate values for anisotropies could fulfill these constraints simultaneously. On the other hand, within more extreme degrees of anisotropies, more speculative constraints such as black widow pulsars PSR J0952-0607 and the mass-gap object in the GW190814 event can be explained as hybrid stars. We also investigate the role of anisotropies in the neutron stars' moment of inertia.
- [9] arXiv:2405.00114 (cross-list from hep-th) [pdf, other]
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Title: Gravitational entropy is observer-dependentComments: 26 pages + references, 2 figures. Comments welcomeSubjects: High Energy Physics - Theory (hep-th); General Relativity and Quantum Cosmology (gr-qc); Quantum Physics (quant-ph)
In quantum gravity, it has been argued that a proper accounting of the role played by an observer promotes the von Neumann algebra of observables in a given spacetime subregion from Type III to Type II. While this allows for a mathematically precise definition of its entropy, we show that this procedure depends on which observer is employed. We make this precise by considering a setup in which many possible observers are present; by generalising previous approaches, we derive density operators for the subregion relative to different observers (and relative to arbitrary collections of observers), and we compute the associated entropies in a semiclassical regime, as well as in some specific examples that go beyond this regime. We find that the entropies seen by distinct observers can drastically differ. Our work makes extensive use of the formalism of quantum reference frames (QRF); indeed, as we point out, the 'observers' considered here and in the previous works are nothing but QRFs. In the process, we demonstrate that the description of physical states and observables invoked by Chandrasekaran et al. [arXiv:2206.10780] is equivalent to the Page-Wootters formalism, leading to the informal slogan "PW=CLPW". It is our hope that this paper will help motivate a long overdue union between the QRF and quantum gravity communities. Further details will appear in a companion paper.
- [10] arXiv:2405.00147 (cross-list from astro-ph.CO) [pdf, other]
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Title: A deconstruction of methods to derive one-point lensing statisticsAuthors: Viviane Alfradique, Tiago Castro, Valerio Marra, Miguel Quartin, Carlo Giocoli, Pierluigi MonacoComments: 14 pages, 12 figures and 3 tablesSubjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO); Astrophysics of Galaxies (astro-ph.GA); General Relativity and Quantum Cosmology (gr-qc)
Gravitational lensing is a crucial tool for exploring cosmic phenomena, providing insights into galaxy clustering, dark matter, and dark energy. Given the substantial computational demands of $N$-body simulations, approximate methods like $\texttt{PINOCCHIO}$ and $\texttt{turboGL}$ offer viable alternatives for simulating lensing probability density functions (PDFs). This paper evaluates these methods in contexts where baryonic effects are negligible, focusing on dark matter-dominated models and assessing their effectiveness across both weak and strong lensing regimes. Our comparative analysis reveals that these methods are particularly effective for applications involving electromagnetic and gravitational wave point sources, where strong lensing events are infrequent. Both $\texttt{PINOCCHIO}$ and $\texttt{turboGL}$ perform well in modeling the weak-lensing region influenced by mildly nonlinear structures. However, they lose accuracy in capturing small-scale nonlinear matter fields, owing to oversimplified assumptions about internal halo structures and reliance on perturbation theory. The analysis shows that $\texttt{PINOCCHIO}$ achieves an 8-15% agreement with $N$-body simulations for the second-to-fourth moments of lensing PDFs. These findings aim to inform future studies on gravitational lensing of point sources, which are increasingly relevant with upcoming supernova and gravitational wave datasets.
- [11] arXiv:2405.00149 (cross-list from hep-th) [pdf, ps, other]
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Title: Gravitational Stress Tensor and Current at Null Infinity in Three DimensionsComments: 10 pagesSubjects: High Energy Physics - Theory (hep-th); General Relativity and Quantum Cosmology (gr-qc)
We develop the framework that reveals the intrinsic conserved stress tensor and current associated with the null infinity of a three-dimensional ($3d$) asymptotically flat spacetime. These are, respectively, canonical conjugates of degenerate metric and Ehresmann connection of the boundary Carrollian geometry. Their conservation reproduces the Bondi-mass and angular momentum conservation equations if the asymptotic boundary is endowed with a torsional affine connection that we specify. Our analysis and results shed further light on the $3d$ flat holography; the stress tensor and current give rise to an asymptotically flat fluid/gravity correspondence. The requirement of a well-defined $3d$ action principle yields Schwarzian action at null infinity governing the dynamics induced by reparametrizations over the celestial circle, in accord with the codimension $2$ holography of $3d$ flat spacetimes.
- [12] arXiv:2405.00226 (cross-list from hep-th) [pdf, ps, other]
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Title: Photon propagator for inflation in the general covariant gaugeComments: 77 pages (including 25 pages of appendices)Subjects: High Energy Physics - Theory (hep-th); Cosmology and Nongalactic Astrophysics (astro-ph.CO); General Relativity and Quantum Cosmology (gr-qc)
Photon propagator for power-law inflation is considered in the general covariant gauges within the canonical quantization formalism. Photon mode functions in covariant gauges are considerably more complicated than their scalar counterparts, except for the special choice of the gauge-fixing parameter we call the simple covariant gauge. We explicitly construct the position space photon propagator in the simple covariant gauge, and find the result considerably more complicated than its scalar counterpart. This is because of the need for explicitly inverting the Laplace operator acting on the scalar propagator, which results in Appell's fourth function. Our propagator correctly reproduces the de Sitter and flat space limits. We use this propagator to compute two simple observables: the off-coincident field strength-field strength correlator and the energy-momentum tensor, both of which yield consistent results. As a spinoff of our computation we also give the exact expression for the Coulomb gauge propagator in power-law inflation in arbitrary dimensions.
- [13] arXiv:2405.00360 (cross-list from hep-th) [pdf, other]
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Title: Heat capacity and quantum compressibility of dynamical spacetimes with thermal particle creationComments: 32 pages, 7 figuresSubjects: High Energy Physics - Theory (hep-th); Statistical Mechanics (cond-mat.stat-mech); General Relativity and Quantum Cosmology (gr-qc)
This work continues the investigation in two recent papers on the quantum thermodynamics of spacetimes, 1) placing what was studied in [1] for thermal quantum fields in the context of early universe cosmology, and 2) extending the considerations of vacuum compressibility of dynamical spaces treated in [2] to dynamical spacetimes with thermal quantum fields. We begin with a warning that thermal equilibrium condition is not guaranteed to exist or maintained in a dynamical setting and thus finite temperature quantum field theory in cosmological spacetimes needs more careful considerations than what is often described in textbooks. A full description requires nonequilibrium quantum field theory in dynamical spacetimes using `in-in' techniques. A more manageable subclass of dynamics is where thermal equilibrium conditions are established at both the beginning and the end of evolution are both well defined. Here we shall assume an in-vacuum state. It has been shown that if the intervening dynamics has an initial period of exponential expansion, such as in inflationary cosmology, particles created from the parametric amplification of the vacuum fluctuations in the initial vacuum will have a thermal spectrum measured at the out-state. Under these conditions finite temperature field theory can be applied to calculate the quantum thermodynamic quantities. Here we consider a massive conformal scalar field in a closed four-dimensional Friedmann-Lemaitre-Robertson-Walker universe based on the simple analytically solvable Bernard-Duncan model. We calculate the energy density of particles created from an in-vacuum and derive the partition function. From the free energy we then derive the heat capacity and the quantum compressibility of the spacetimes with thermal particle creation. We end with some discussions and suggestions for further work in this program of studies.
- [14] arXiv:2405.00502 (cross-list from astro-ph.CO) [pdf, other]
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Title: Using non-DESI data to confirm and strengthen the DESI 2024 spatially-flat $w_0w_a$CDM cosmological parameterization resultComments: 9 pages, 3 figuresSubjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Theory (hep-th)
We use a combination of Planck cosmic microwave background (CMB) anisotropy data and non-CMB data that include Pantheon+ type Ia supernovae, Hubble parameter [$H(z)$], growth factor ($f\sigma_8$) measurements, and a collection of baryon acoustic oscillation (BAO) data, but not recent DESI 2024 BAO measurements, to confirm the DESI 2024 (DESI+CMB+PantheonPlus) data compilation support for dynamical dark energy with an evolving equation of state parameter $w(z) = w_0 + w_a z/(1+z)$. From our joint compilation of CMB and non-CMB data, in a spatially-flat cosmological model, we obtain $w_0 = -0.850 \pm 0.059$ and $w_a = -0.59^{+0.26}_{-0.22}$ and find that this dynamical dark energy is favored over a cosmological constant by $\sim 2\sigma$. Our data constraints on the flat $w_0w_a$CDM model are slightly more restrictive than the DESI 2024 constraints, with the DESI 2024 and our values of $w_0$ and $w_a$ differing by $-0.27\sigma$ and $0.44\sigma$, respectively. Our data compilation slightly more strongly favors the flat $w_0w_a$CDM model over the flat $\Lambda$CDM model than does the DESI 2024 data compilation.
- [15] arXiv:2405.00546 (cross-list from astro-ph.HE) [pdf, other]
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Title: Ultralight Primordial Black HolesAuthors: Stefano ProfumoComments: 10 pages, 2 figures, To appear in the book "Primordial Black Holes", ed. Chris Byrnes, Gabriele Franciolini, Tomohiro Harada, Paolo Pani, Misao Sasaki; Springer (2024)Subjects: High Energy Astrophysical Phenomena (astro-ph.HE); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Phenomenology (hep-ph)
The fate of ultralight black holes depends on whether or not evaporation stops at or around the Planck scale. If evaporation stops, the general expectation is that a population of Planck-scale will be left over, possibly including a significant fraction of electrically charged relics. If evaporation does not stop, a runaway "explosion" would occur, with significant and potentially detectable high-energy emission. Here, I review both possibilities, with an emphasis on current status and future detection prospects.
- [16] arXiv:2405.00553 (cross-list from astro-ph.HE) [pdf, other]
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Title: Applying the starquake model to study the formation of elastic mountains on spinning neutron starsComments: 16 pages, 7 figures. Comments welcomeSubjects: High Energy Astrophysical Phenomena (astro-ph.HE); General Relativity and Quantum Cosmology (gr-qc)
When a neutron star is spun-up or spun-down, the changing strains in its solid elastic crust can give rise to sudden fractures known as starquakes. Early interest in starquakes focused on their possible connection to pulsar glitches. While modern glitch models rely on pinned superfluid vorticity rather than crustal fracture, starquakes may nevertheless play a role in the glitch mechanism. Recently, there has been interest in the issue of starquakes resulting in non-axisymmetric shape changes, potentially linking the quake phenomenon to the building of neutron star mountains, which would then produce continuous gravitational waves. Motivated by this issue, we present a simple model that extends the energy minimisation-based calculations, originally developed to model axisymmetric glitches, to also include non-axisymmetric shape changes. We show that the creation of a mountain in a quake necessarily requires a change in the axisymmetric shape too. We apply our model to the specific problem of the spin-up of an initially non-rotating star, and estimate the maximum mountain that can be built in such a process, subject only to the constraints of energy and angular momentum conservation.
- [17] arXiv:2405.00597 (cross-list from quant-ph) [pdf, other]
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Title: Non-abelian symmetry-resolved entanglement entropyComments: 50 pages, 5 figuresSubjects: Quantum Physics (quant-ph); Statistical Mechanics (cond-mat.stat-mech); Strongly Correlated Electrons (cond-mat.str-el); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Theory (hep-th)
We introduce a mathematical framework for symmetry-resolved entanglement entropy with a non-abelian symmetry group. To obtain a reduced density matrix that is block-diagonal in the non-abelian charges, we define subsystems operationally in terms of subalgebras of invariant observables. We derive exact formulas for the average and the variance of the typical entanglement entropy for the ensemble of random pure states with fixed non-abelian charges. We focus on compact, semisimple Lie groups. We show that, compared to the abelian case, new phenomena arise from the interplay of locality and non-abelian symmetry, such as the asymmetry of the entanglement entropy under subsystem exchange, which we show in detail by computing the Page curve of a many-body system with $SU(2)$ symmetry.
- [18] arXiv:2405.00608 (cross-list from astro-ph.CO) [pdf, other]
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Title: $f(T)$ gravity after DESI Baryon Acoustic Oscillation and DES Supernovae 2024 dataComments: 5 pages, 3 tables and 1 figureSubjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO); General Relativity and Quantum Cosmology (gr-qc)
In this letter we investigate new constraints on $f(T)$ gravity using the recent Baryon Acoustic Oscillation (BAO) data released by the Dark Energy Spectroscopic Instrument (DESI) and the Type Ia supernovae (SNIa) catalog from the full 5-years of the Dark Energy Survey Supernova Program (DES-SN5YR). The $f(T)$ cosmological models considered are characterised by power law late-time accelerated expansion. Our results show that the combination DESI BAO +$r_d$ CMB Planck suggests a Bayesian preference for late-time $f(T)$ cosmological models over $\Lambda$CDM, obtaining a value of $H_0=72.4\pm 2.9$[km/s/Mpc] in agreement with SH0ES collaboration.
- [19] arXiv:2405.00668 (cross-list from astro-ph.CO) [pdf, other]
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Title: Environmental cosmic acceleration from a phase transition in the dark sectorComments: 5 pages, 2 figuresSubjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Theory (hep-th)
A new degravitation mechanism within the framework of scalar tensor gravity is proposed. The mechanism eliminates all constant contributions from the potential to the Friedmann equation, leaving only the kinematic and the dynamic terms of the potential to drive cosmic acceleration. We explore a scenario involving a density-triggered phase transition in the late-time universe, and argue that the resulting effective energy density and equation of state parameter can explain late-time cosmology when extrapolated to a region of the parameter space.
Replacements for Thu, 2 May 24
- [20] arXiv:2303.15921 (replaced) [pdf, other]
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Title: Pole-skipping of gravitational waves in the backgrounds of four-dimensional massive black holesComments: v1: 37 pages, 4 figuresJournal-ref: Eur. Phys. J. C (2023) 83: 1103Subjects: High Energy Physics - Theory (hep-th); General Relativity and Quantum Cosmology (gr-qc); Mathematical Physics (math-ph)
- [21] arXiv:2304.03794 (replaced) [pdf, other]
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Title: Numerical solutions for the $f(R)$-Klein-Gordon systemComments: 34 pages, 7 figures, corrigendum includedJournal-ref: Class. Quantum Grav. 40 175009 (2023); Corrigendum: Class. Quantum Grav. 40 249503 (2023)Subjects: General Relativity and Quantum Cosmology (gr-qc)
- [22] arXiv:2306.07323 (replaced) [pdf, other]
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Title: Crossed product algebras and generalized entropy for subregionsComments: Minor clarifications, matches published versionJournal-ref: SciPost Phys. Core 7, 020 (2024)Subjects: High Energy Physics - Theory (hep-th); General Relativity and Quantum Cosmology (gr-qc)
- [23] arXiv:2307.10402 (replaced) [pdf, other]
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Title: Mitigating the counterpart selection effect for standard sirensComments: Physical Review Letters accepted versionSubjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO); Instrumentation and Methods for Astrophysics (astro-ph.IM); General Relativity and Quantum Cosmology (gr-qc)
- [24] arXiv:2308.02928 (replaced) [pdf, other]
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Title: Causal and stable first-order chiral hydrodynamicsComments: 21 pages, 1 figure. Version accepted for publication in Physical Review DSubjects: High Energy Physics - Theory (hep-th); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Phenomenology (hep-ph); Nuclear Theory (nucl-th)
- [25] arXiv:2308.12155 (replaced) [pdf, other]
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Title: Novel regular black holes: geometry, source and shadowComments: Matches the published versionJournal-ref: General Relativity and Gravitation 56, 52 (2024)Subjects: General Relativity and Quantum Cosmology (gr-qc)
- [26] arXiv:2311.07655 (replaced) [pdf, other]
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Title: Page curves and replica wormholes from random dynamicsComments: 43 pages, 10 figuresSubjects: High Energy Physics - Theory (hep-th); General Relativity and Quantum Cosmology (gr-qc); Quantum Physics (quant-ph)
- [27] arXiv:2311.07671 (replaced) [pdf, ps, other]
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Title: Charged rotating BTZ solution revisited: New coordinates and algebraic classificationsComments: 31 pages, no figure, 1 table; v2, final version to appear in Classical and Quantum GravitySubjects: General Relativity and Quantum Cosmology (gr-qc)
- [28] arXiv:2312.02351 (replaced) [pdf, ps, other]
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Title: No U(1) 'electric-magnetic' duality in Einstein gravityAuthors: Ricardo MonteiroComments: 20 pages. v2: minor changesSubjects: High Energy Physics - Theory (hep-th); General Relativity and Quantum Cosmology (gr-qc)
- [29] arXiv:2312.08534 (replaced) [pdf, other]
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Title: Temporal Entanglement Entropy as a probe of Renormalization Group FlowComments: 13+2 pages, 3 figures; v2: minor improvements; matches version accepted in JHEPSubjects: High Energy Physics - Theory (hep-th); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Phenomenology (hep-ph); Nuclear Theory (nucl-th)
- [30] arXiv:2401.14329 (replaced) [pdf, ps, other]
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Title: Pulsar timing array source ensemblesComments: Final published versionJournal-ref: Phys. Rev. D 109, 083038 (2024)Subjects: General Relativity and Quantum Cosmology (gr-qc); Cosmology and Nongalactic Astrophysics (astro-ph.CO); High Energy Astrophysical Phenomena (astro-ph.HE)
- [31] arXiv:2402.19459 (replaced) [pdf, other]
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Title: Anomalous contribution to galactic rotation curves due to stochastic spacetimeComments: v2 : a comment added, and more critical discussion extendedSubjects: General Relativity and Quantum Cosmology (gr-qc); Astrophysics of Galaxies (astro-ph.GA); High Energy Physics - Theory (hep-th)
- [32] arXiv:2403.13074 (replaced) [pdf, other]
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Title: Calculating quasinormal modes of extremal and non-extremal Reissner-Nordström black holes with the continued fraction methodComments: 13 pages, 3 figures, regular article, minor corrections of the language, an acknowledgment section is added, the paper is accepted for publication in PRDSubjects: General Relativity and Quantum Cosmology (gr-qc); Cosmology and Nongalactic Astrophysics (astro-ph.CO)
- [33] arXiv:2404.09225 (replaced) [pdf, other]
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Title: Nonlocal Gravity, Dark Energy and Conformal Symmetry: Testing the Hierarchies of Anomaly-Induced ActionsComments: 22 pages, 2 figures. Proceedings of Corfu Summer Institute, Workshop on the Standard Model and Beyond, August 27- September 7, 2023. arXiv admin note: text overlap with arXiv:2212.12779Subjects: High Energy Physics - Theory (hep-th); General Relativity and Quantum Cosmology (gr-qc)
- [34] arXiv:2404.11670 (replaced) [pdf, other]
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Title: Boltzmannian state counting for black hole entropy in Causal Set TheoryComments: 18 pages, 9 figuresSubjects: General Relativity and Quantum Cosmology (gr-qc)
- [35] arXiv:2404.17277 (replaced) [pdf, other]
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Title: Spherical orbits around Kerr-Newman and Ghosh black holesComments: 50 pages, 23 figures, submitted to the Gen. Rel. GravSubjects: General Relativity and Quantum Cosmology (gr-qc)
- [36] arXiv:2404.17449 (replaced) [pdf, ps, other]
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Title: On the Meaning of Local Symmetries: Epistemic-Ontological DialecticsComments: 21 pagesSubjects: History and Philosophy of Physics (physics.hist-ph); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Theory (hep-th); Differential Geometry (math.DG)
- [37] arXiv:2404.19423 (replaced) [pdf, other]
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Title: Thermodynamics of charged Lifshitz black holes with scalar hairComments: 12 pages, 2 figuresSubjects: General Relativity and Quantum Cosmology (gr-qc)
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