gr-qc papers | Gist.Science

The $f(Q)$ gravity and affine EoS: Compatibility and observational constraints

This paper investigates the cosmological implications of an affine equation of state within General Relativity and $f(Q)$ gravity, demonstrating that while both frameworks can unify the universe's transition from decelerated to accelerated expansion, the affine model yields quintessence-like dark energy in General Relativity but phantom-like dark energy in $f(Q)$ gravity, with parameters constrained by Cosmic Chronometer and Supernovae type Ia data.

Romanshu Garg, G. P. Singh, Ashutosh Singh2026-03-10⚛️ gr-qc

Indications against dynamical CPT symmetry restoration in quantum gravity

By calculating the Renormalization Group flow of CPT-violating interactions under quantum metric fluctuations, the authors demonstrate that CPT symmetry cannot be an emergent low-energy phenomenon, thereby ruling out quantum gravity approaches that allow for its fundamental breaking.

Astrid Eichhorn, Marc Schiffer2026-03-10⚛️ hep-th

Rotating Kinetic Gas Disk Morphology Surrounding a Schwarzschild Black Hole

This paper analyzes the morphology and macroscopic observables of rotating relativistic kinetic gas clouds surrounding a Schwarzschild black hole, comparing configurations with and without total angular momentum using a polytropic ansatz for the one-particle distribution function.

Carlos Gabarrete, Roger Raudales2026-03-10⚛️ gr-qc

Geometric realization of stress-tensor deformed field theory

This paper establishes a semiclassical framework demonstrating that stress-tensor deformations of quantum field theories are equivalent to gravitational actions evaluated at metric saddles, thereby creating a bidirectional link between field theory flows and classical gravity that is explicitly verified through the emergence of an induced Newton constant in a deformed free scalar theory.

Yun-Ze Li, Yunfei Xie, Song He2026-03-10⚛️ hep-th

Information paradox and island of covariant black holes in LQG

This paper investigates the information paradox in four-dimensional covariant black holes within Loop Quantum Gravity, revealing that while two distinct solutions exhibit contrasting evaporation dynamics, the application of the island prescription to the first solution successfully recovers unitarity by suppressing late-time entropy growth through the influence of the LQG parameter.

Yongbin Du, Jia-Rui Sun, Xiangdong Zhang2026-03-10⚛️ gr-qc

First-order phase transitions and cosmic evolution: thermodynamic approach to generalized holographic dark energy

This study investigates cosmic evolution in a spatially flat FLRW universe using a generalized holographic dark energy model with polynomial Hubble parameter contributions to determine the possibility of first-order thermodynamic phase transitions.

Miguel Cruz, Joaquin Housset, Samuel Lepe + 2 more2026-03-10⚛️ gr-qc

Exploring the landscape of black hole mimickers

This paper investigates a general class of singularity-free, geodesically complete spacetime metrics that mimic black holes without event horizons, analyzing their scalar perturbations, quasinormal modes, and potential observational signatures such as shadows and echo effects, with a specific focus on metrics lacking $Z_2$ symmetry.

Sergey N. Solodukhin, Vagif Tagiev2026-03-10⚛️ hep-th

Novel scalar degrees of freedom emerging from hybrid metric-Palatini gravity

This paper introduces the hybrid metric-Palatini scalar-tensor (HMPST) theory as an extension of hybrid metric-Palatini gravity, demonstrating that its linear- $f(\hat{R})$ subclass consistently unifies cosmological acceleration, astrophysical compact objects, and Solar System constraints through analytically tractable solutions and Yukawa-type weak-field corrections that recover General Relativity.

David S. Pereira, Salvatore Capozziello, Francisco S. N Lobo + 1 more2026-03-10⚛️ gr-qc

Ergodic Hysteresis of the Kerr black hole spectrum

This paper reveals that massive scalar perturbations of Kerr black holes exhibit an infinite cascade of exceptional points near the extremal limit, which mediate transitions between damped and zero-damping modes and induce adiabatic ergodicity through geometric phase-driven mode mixing across the overtone spectrum.

João Paulo Cavalcante, Maurício Richartz, Bruno Carneiro da Cunha2026-03-10⚛️ gr-qc

Inflationary relics from an Ultra-Slow-Roll plateau

This paper investigates the formation of primordial black holes in ultra-slow-roll inflation scenarios with a sharp transition, revealing through numerical simulations that while both vacuum bubble and adiabatic perturbation channels contribute, the latter dominates the mass function by a factor of $10 $to$ 100$ and is primarily driven by mean profiles.

Albert Escriv�, Jaume Garriga, Shi Pi2026-03-10⚛️ hep-th

Bohmian Quantum Cosmology from the Wheeler-DeWitt Equation

This paper constructs a solvable Bohmian quantum cosmological model for a flat universe with a unified dark sector scalar field by mapping the Wheeler-DeWitt equation to a hyperbolic oscillator, enabling the derivation of deterministic trajectories that reproduce late-time $\Lambda$ CDM expansion while exhibiting quantum modifications at early epochs.

Spyros Basilakos, Gerasimos Kouniatalis, Emmanuel N. Saridakis + 1 more2026-03-10⚛️ gr-qc

Critical collapse of a massive scalar field in semi-classical loop quantum gravity

Numerical simulations of massive scalar field collapse within two semi-classical loop quantum gravity frameworks reveal that critical phenomena remain consistent with classical general relativity, exhibiting type II behavior for small masses and type I behavior with a finite minimum black hole mass for large masses, indicating that semi-classical LQG corrections have a negligible impact on these dynamics.

Li-Jie Xin, Xiangdong Zhang2026-03-10⚛️ gr-qc

Tango of Titans: Centaurus A and M83 as a Local Group Analog

This paper establishes that the Centaurus A and M83 galaxy pair is dynamically infalling toward each other with a total mass of approximately $6.36 \times 10^{12}\, M_\odot$, confirming their status as a compelling nearby analog to the Milky Way-Andromeda system in the Local Group.

David Benisty, Noam Libeskind, Dmitry Makarov2026-03-10⚛️ gr-qc

Circular strings, magnons, plane waves and local quenches in BTZ

This paper demonstrates that string theory on the BTZ geometry admits states with dispersion relations identical to classical solutions in $AdS_3$ , related by a specific map that connects $AdS_3$ particles to BTZ horizon-falling particles, thereby identifying these states as local quenches in the dual thermal CFT.

Justin R. David, Rahul Metya2026-03-10⚛️ hep-th

Constraining $β$ -Exponential Inflation with the latest ACT observations

This paper demonstrates that the $\beta$ -exponential inflationary potential, particularly when augmented with a small non-minimal coupling, successfully reconciles the higher scalar spectral index indicated by recent ACT and DESI observations with current CMB constraints by predicting a spectral tilt larger than universal attractor models while suppressing the tensor-to-scalar ratio.

Jureeporn Yuennan, Farruh Atamurotov, Salvatore Capozziello + 1 more2026-03-10⚛️ gr-qc

From Bertotti--Robinson to Vacuum: New Exact Solutions in General Relativity via Harrison and Inversion Symmetries

This paper constructs new accelerating vacuum solutions in General Relativity by applying Harrison and Inversion symmetries to electrovacuum configurations, demonstrating how external electromagnetic fields can be removed to leave non-trivial gravitational backreactions, including a new two-parameter extension of the Schwarzschild–Levi-Civita geometry and a stationary generalization.

José Barrientos, Adolfo Cisterna, Amaro Díaz + 1 more2026-03-10⚛️ hep-th

Resolution of Black Hole Singularities in Jackiw-Teitelboim Gravity

This paper demonstrates that introducing a left confining potential in Jackiw-Teitelboim gravity not only restores the required discrete spectral statistics to resolve the black hole entropy paradox but also dynamically prevents the indefinite growth of wormhole length, thereby resolving the black hole singularity.

Dongsu Bak, Chanju Kim, Sang-Heon Yi2026-03-10⚛️ hep-th

Twisted Standard Model and its Krein structure -- in memoriam Manuele Filaci

This paper reviews the contributions of the late Manuele Filaci to the noncommutative geometry description of the Standard Model, demonstrating how minimal twists induce a Krein space structure on the spectral triple's Hilbert space and reveal the twistor symmetry group as a subgroup of the resulting unitary group.

Pierre Martinetti2026-03-10🔢 math-ph

All $2D $generalised dilaton theories from$ d\geq 4$ gravities

This paper demonstrates that all two-dimensional Horndeski theories can be derived from higher-dimensional pure gravity reductions, leading to a Birkhoff theorem for a class of "quasi-topological" gravities that allows for the explicit reconstruction of any static, spherically symmetric, asymptotically flat spacetime satisfying specific metric conditions as a vacuum solution, including regular black holes like the Bardeen spacetime.

Johanna Borissova2026-03-10⚛️ hep-th

Flat holography for spinor fields

This paper establishes a flat-space holographic dictionary for free massive spinor fields in four-dimensional Minkowski spacetime by utilizing hyperbolic slicing to reduce the problem to effective $\mathrm{AdS}_3$ systems, thereby deriving universal two-point correlation functions for dual spinning operators on the celestial sphere and clarifying the construction of spinor conformal primary wavefunctions.

Dmitry S. Ageev, Anna S. Bernakevich2026-03-10⚛️ hep-th

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gr-qc

The f(Q)f(Q)f(Q) gravity and affine EoS: Compatibility and observational constraints