New papers on Gravity theory
48 new papers on gravity theory in the last 7 days, within Space & cosmos. These are the 48 Pipette rates most worth reading, with the main result in the authors' own words.
The best of the week
LQG-inspired black hole solutions in (2+1)-dimensions
In this letter, we construct, for the first time, three independent LQG-inspired frameworks for (2+1)-dimensional black holes: the -scheme holonomy corrections, the quantum Oppenheimer-Snyder collapse, and a covariant effective model.
PreprintClaims a big stepBinary-pulsar Timing: A 3D Solar-System Accelerometer and Unknown-Source Probe
Using the binary-pulsar timing measurements, we develop an analysis framework that combines the line-of-sight differential accelerations of 26 binary pulsars to jointly reconstruct the three-dimensional acceleration of the SSB and place directional upper limits.
PreprintFrozen-In Gravitational Fields
Using a formulation of Einstein equations that parallels nonlinear electrodynamics of continuous media, we show that general relativity admits gravitational field connections---two-surfaces and associated field lines whose connectivity is maintained by the spacetime dynamics.
Preprint with a published versionHow Universal Is the Black Hole Zeroth Law?
Exploiting this novel diagnostic, we obtain the first exact proof of the zeroth law in the broader landscape of higher-curvature gravity, without relying on a perturbative expansion around general relativity.
PreprintTheory of Gravity as Theory of Local Inertial Frames
It is proved that the affine theory of the full Riemann tensor constitutes the extended theory of gravity.
PreprintCondensates: A Bridge to Quantum Gravity
The way out runs through condensed matter physics: laboratory tests of generalized uncertainty relations, analog systems, and --- most provocatively --- frameworks in which spacetime itself is a condensate.
PreprintBold claims, read criticallyLarge-scale chaos in restricted hierarchical triples driven by short-range forces
Conclusions: In the presence of short-range forces, flipping orbits accompanied by extreme eccentricity excitation are fundamentally chaotic, and the underlying mechanism of large-scale chaos originates from the periodic passage of trajectories through the uncertainty zone in phase space over secular timescales.
PreprintA computer assisted existence proof for a non-Schwarzschild black hole in Einstein--Weyl gravity
We give a computer assisted existence proof for a non-Schwarzschild solution whose dimensionless horizon radius is one in units of the massive spin-two scale, with parameters close to the previously reported numerical branch.
PreprintThermodynamics of arbitrary spherical surfaces in FLRW spacetimes
These results demonstrate that the gravity-thermodynamics correspondence is a generic feature of gravitational dynamics rather than a property unique to causal horizons.
PreprintOperator-Level Quantum-Classical Correspondence in Relativistic Quantum Theory and Curved Spacetime
We explicitly show that the Heisenberg equations of motion for quantum field operators reproduce the corresponding classical equations of motion for a broad class of field theories.
PreprintCanonical Quantization and Constraint Algebra of Weyl-Invariant Gravity in a Conformal Gauge: Emergence of a Geometric Cosmological Term
From a pure conformal symmetry principle, the model delivers an effective geometric cosmological term that drives the accelerated expansion with , providing the missing action principle for CMaDE.
Preprint with a published versionBold claims, read criticallyThe geometric origin of the thermal eccentricity law
We obtain , so that, within this family, is the only case for which the distribution function is linear in .
PreprintReconnection of Gravitational Fields
We derive quantitative measures of the gravitational reconnection rate, show that gravitational reconnection alters the energy-momentum exchange between the gravitational and matter sectors, and determine how it modifies the evolution of gravitational helicity.
PreprintTime and causality in quantum gravity
This analysis shows that the conceptual difficulties associated with time do not arise only when gravity is quantised.
PreprintLight Cone Thermodynamics: Quasi-Local Formalism
Together with a definition of internal energy derived from the Landau-Lifshitz pseudotensor, these results are used to construct a postulational framework that generalizes classical thermodynamics in order to include the dynamics of spacetime.
PreprintBold claims, read criticallyInstability of naked singularities of perfect fluid under gravitational perturbations
We show that small perturbations (without any symmetries) of the initial conformal metric lead to trapped surface formation.
PreprintDynamical Friction in an Ultralight Scalar Medium across Coherent and Stochastic Regimes
We derive integral expressions for the instantaneous force and the orbit-averaged energy flux generated by wake perturbations of a general background field.
PreprintEmergence of Horndeski gravity from asymptotic safety?
Surprisingly, we find that despite the constraints from asymptotic safety, this ratio can be achieved for a specific value of the cosmological constant.
PreprintThe Lanczos potential in the Plebanski paradigm of gravity
We present a new Plebanski formulation of General Relativity.
PreprintModified Gravity from growth data: goodness-of-fit and gravitational coupling
In contrast, the -AB model predicts and , a tension with Planck 2018, rendering it physically disfavored despite its competitive statistical performance.
PreprintSlowly Rotating Wormholes in f(R,T) Gravity: Particle Dynamics and Weak-field Lensing
Our results indicate that the required matter meets both the null and strong energy conditions, demonstrating that rotating wormholes do not necessarily require unconventional sources.
PreprintRadial quantization of the Schwarzschild geometry: relational observables, evaporation, and remnant state
In this way, the resulting quantum theory admits a physical Hilbert space of states that solve the radial constraint equation and simultaneously describe the exterior and interior regions of the black hole.
PreprintSoliton solution of a gravitating chiral-quark soliton model: dynamical fermion and Dirac-sea in general relativity
We successfully solve the CQSM and the Einstein equation self-consistently, and obtain the spectral flow of the fermion energies and also of the ADM mass.
PreprintBi-scalar-tensor theory: a spatially covariant gravity approach
We propose a novel method for constructing ghost-free multi-field higher-derivative scalar-tensor theories.
PreprintCircular acceleration in Minkowski spacetime: thermality versus finite size
We establish analytic results for the detector response in the large-boundary regime and identify resonance peaks, which are more prominent when the field has an ambient temperature.
PreprintAn exact Kerr-like rotating Morris--Thorne wormhole: throat, ergoregion and equatorial shadow slice
We construct an exact Kerr-like rotating extension of the zero-redshift Morris--Thorne wormhole in a Teo-type stationary, axisymmetric ansatz.
Preprint with a published versionHigher derivative Ho\v{r}ava-Lifshitz fermions: from superconductivity to atomic spectroscopy
Within the regime of validity of the derivative expansion, we develop three complementary consequences of the sector.
PreprintA nonlinear Newtonian approximation to General Relativity
We investigate a nonrelativistic approximation to general relativity that does not require the metric coefficients to be weak perturbations of the Minkowski metric.
PreprintProbing modified gravity with galaxy-cluster-lensed gravitational-wave time delays: impact of systematic effects
Within the adopted gravity model, neglecting halo ellipticity, secondary cluster-scale structure, cluster mis-centring and line-of-sight perturbations can induce significant, strongly configuration-dependent biases in the inferred parameter .
PreprintNull test of general relativity based on gravitational waves
Applying our null test scheme to five O1/O2 binary black hole events, we find some GR deviation signatures but they are not conclusive yet.
Preprint with a published versionCosmology in sixth-order higher-derivative theories of gravity
We find that sixth-order operators produce controlled deviations from the Starobinsky model while preserving the EFT expansion, thereby providing a consistent phenomenological framework to probe ultraviolet gravitational corrections through cosmological observables.
PreprintLight bending and observational bounds in dyonic Kalb-Ramond gravity
We further construct combinations of strong-lensing observables that separate the effective charge from the conical parameter within the model: angular separation and relative brightness remove the explicit winding dependence, while a timing ratio incorporating an independent distance estimate isolates the conical deformation.
PreprintAnalytic detector responses and entanglement in constant-curvature spacetimes
We derive analytic response functions for Unruh--DeWitt detectors coupled to real, massless, conformally coupled scalar fields, to distinguish the effects of the field spectrum and global geometry from those of the interaction protocol.
PreprintExact DeWitt kernels in Lorentzian quantum cosmology
We give a general definition of the resulting DeWitt kernels, together with explicit rules for constructing them, and evaluate them exactly.
PreprintThin-Shell Black Bounce
Motivated by this observation, we construct a new class of black-bounce solutions with static, spherical symmetry featuring the emergence of a minimal-area bounce supported by a thin shell.
PreprintEquivalence of the wave function of the universe in the Einstein and Jordan frames
We show that the equivalence between the frames depends on the operator ordering scheme of the quantum Hamiltonian: if the quantum theory is covariant under point canonical transformations in the minisuperspace, then the equivalence between the two frames holds.
PreprintMatter density perturbations in Quadratic Gravity
Our results show that quadratic gravity cannot generally reproduce the standard cosmological evolution of perturbations and in the regions where it can, it closely matches the behavior of theories.
PreprintOptical and Dynamical Signatures of Pad\'{e} Approximated Wormholes in Gravity
We construct traversable wormhole solutions in the linear teleparallel model , adopting Pad\'e approximants of order [1/0] and [0/1] as shape functions together with the redshift function , and derive the corresponding source terms from the modified field equations.
PreprintAnalytical and spectral characterization of floral patterns in higher-order polynomial pp-waves
A Fourier analysis shows that the response remains overwhelmingly dominated by the angular mode ; in particular, the loops found for arise from geometrical folding of the fundamental mode rather than strong harmonic mixing.
PreprintThe Weyl double copy for relativistic Rindler fluids
We study the Petrov classification and Weyl double copy of the four-dimensional bulk metric dual to a -dimensional relativistic Rindler fluid at first order in the relativistic gradient expansion.
PreprintCharged Klein-Gordon modes on an Ellis wormhole: magnetic confinement and conditional Heun solvability
For nonzero magnetic coupling, the quadratic asymptotic term produces radial confinement on the complete wormhole.
PreprintSourced Gravitational Radiation in Parity-Violating Tetrad Gravity
We study linear gravitational modes, sourced far-zone fields, and quadratic energy balance in a four-parameter tetrad theory of gravity.
PreprintMassive scalar's self-mass from gravitons in de Sitter
We compute the fully renormalized one-graviton-loop contribution to the self-mass of a massive scalar field in de Sitter space.
PreprintA Cartan-geometrical perspective on torsion and non-metricity
We consider extensions of this framework that correspond to rolling of a shape with twisting and with shape evolution; it is shown that these naturally describe torsion and non-metricity respectively.
PreprintSpacetimes of maximal proper acceleration and muon mean lifetime
In this paper, it is shown that in spacetimes of maximal proper acceleration, there is a reduction of the mean lifetime of the muon.
Preprint with a published versionPotential-space geometry and scalar rigidity of the Pleba\'nski-Demia\'nski ansatz without a cosmological constant
Consequently, within the quadratic St\"ackel class studied here, there is no local nonconstant solution with an ordinary dilaton.
PreprintRevisiting the Entangled Relativity gravity framework
Specifying to weak field spherical stars suggests that Entangled Relativity and its proposed generalization are worthy alternatives to General Relativity.
PreprintBold claims, read criticallyScalar halos and conical matching for finite-width vortices at a wormhole throat
Together with the local weak-gravity deficit relation, this supplies the leading mixed Einstein constraint of a restricted varying cone.
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