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Cosmology of fractional gravity

Ivan Salvador-Garcia, Gianluca Calcagni · 2026

This is a first study of the cosmology of classical fractional gravity, a nonlocal proposal endowed with self-adjoint fractional d'Alembertian operators which serves as the basis for an ultraviolet-co…

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Near--extremal gravitational collapse in 4+1 dimensions: Schwarzschild--de--Sitter space

Maciej Dunajski, Sebastian J. Szybka · 2026

We numerically study a formation of near extremal horizons from a gravitational collapse of radially symmetric gravitational waves in $4+1$ dimensions within the framework of pure Einstein gravity wit…

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Regular ultracompact objects with anti-de Sitter cores as polymerized vacuum solutions

Hongguang Liu, Ioannis Soranidis · 2026

We present a systematic derivation of regular black hole solutions - and their horizonless counterparts - that achieve regularization via an anti-de Sitter core. These geometries emerge as polymerized…

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Hamilton--Jacobi theory for non-conservative field theories in the $k$-contact framework

Javier de Lucas, Julia Lange, Xavier Rivas, Cristina Sardon · 2026

This article develops a Hamilton--Jacobi theory for non-conservative classical field theories, with particular emphasis on dissipative systems, in the framework of co-oriented k-contact geometry. We i…

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Numerical inverse scattering transform for the coupled modified Korteweg-de Vries equation

Wen-Xin Zhang, Yong Chen · 2026

This paper develops the numerical inverse scattering transform (NIST) framework for the coupled modified Korteweg-de Vries (mKdV) equation based on its associated Riemann-Hilbert problem. The coupled …

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Bound-State Resonances of Schwarzschild-de Sitter Black Holes: Analytic Treatment

Qi-Dong Chen, Chong-Bin Chen, Guo-Qing Huang, Fu-Wen Shu, Tieguang Zi · 2026

Inspired by Mashhoon's framework connecting black hole quasi-normal modes (QNMs) to bound-state resonances in inverted potentials, V$\ddot{\text{o}}$lkel's recent numerical analysis of asymptotically …

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Physics Preprint PDF DOI

Holographic realization of higher-spin Carrollian free fields

Ethan D'Arcy, Arnaud Delfante, Stefan Fredenhagen · 2026

We provide a holographic bulk realization of Carrollian free-field structures arising in three-dimensional asymptotically flat (higher-spin) gravity. We construct a class of boundary conditions that g…

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Permutation Invariant Optimization Problems in Quantum Information Theory: A Framework for Channel Fidelity and Beyond

Bjarne Bergh, Marco Parentin · 2026

Exploiting permutation invariance to reduce the exponential scaling of semidefinite programs in quantum information has emerged as a powerful computational technique. In this work, we develop a system…

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Deforming ${\rm AdS}_3\times S^3\times T^4$ in Type IIB Supergravity

Stefano Maurelli, Ruggero Noris, Marcelo Oyarzo, Mario Trigiante · 2026

We discuss some new results on the construction of supersymmetric solutions of Type IIB supergravity of the form ${\rm WAdS}_3\times{\rm WS}^3\times T^4$, ${\rm WAdS}_3$ and ${\rm WS}^3$ denoting \emp…

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Continuum contribution to charged-current absorption of low-energy $\nu_e$ on $^{40}$Ar

Steven Gardiner, Pablo Barham Alzas, Alexis Nikolakopoulos, Luca H. Abu El-Haj, Natalie Jachowicz, Vishvas Pandey · 2026

Accurate modeling of the absorption of tens-of-MeV $\nu_e$ on $^{40}$Ar is needed to enable measurements of astrophysical neutrinos using large liquid argon time projection chamber (LArTPC) detectors,…

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Causal structure of black holes immersed in a Chaplygin-like dark fluid environment: Horizons and singularities

Rodrigo Dal Bosco Fontana, Jeferson de Oliveira · 2026

In the present work, we study the causal structure of spherically symmetric black holes immersed in a Chaplygin-like dark fluid, emphasizing the impact of the fluid parameters on curvature and horizon…

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Complex Geodesics in the Nariai Geometry

Lars Aalsma, Mir Mehedi Faruk · 2026

We study two-point correlation functions of heavy scalar fields in the Nariai geometry. Utilizing the heat kernel formalism, we obtain this result from a geodesic approximation to the two-point functi…

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Thermodynamic properties of the Kerr Black-hole in non-linear electrodynamics with cosmological constant

Vinayak S. Pawar, Siba Prasad Das · 2026

We study thermodynamic properties, in particular the Temperature~(T), Angular velocity~($\Omega_h$) and Entropy~(S) of the of magnetically charged slowly rotating (with rotation parameter $a \lsim 0.1…

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Cosmological evolution of fast radio bursts and its rapid decline relative to star formation rate

X. D. Jia, D. H. Gao, J. H. Chen, Q. Wu, S. X. Yi, F. Y. Wang (NJU) · 2026

Fast radio bursts (FRBs) are enigmatic millisecond-duration radio transients whose physical origins remain debated. To shed light on this, we analyze the CHIME/FRB Catalog 2. By using the probability …

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On the simplicity of de Sitter correlators

Chandramouli Chowdhury, Song He, Yong-Xiang Su, Dongyu Yang · 2026

Motivated by recent evidence that equal-time correlators can be simpler than the corresponding wavefunction coefficients, we study de Sitter correlators in conformally coupled $\phi^3$ theory directly…

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Tidal Heating of Stellar Clusters in Fuzzy Dark Matter Halos

Yiheng Liu, Xinyu Li · 2026

Ultra-faint dwarf galaxies serve as powerful testing grounds for wave dark matter models through dynamical stellar heating. Previous simulation-based work derived a lower bound on the fuzzy dark matte…

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Inflationary Scenarios in $f(Q,\phi)$ Gravity with Scalar Field Coupling

F. Mavoa, M.B. Barry, R. Ndioukane, M.G. Ganiou, F.K. Ahloui · 2026

In this work, we investigated several inflationary scenarios within the framework of modified $f(Q,\phi)$ gravity with a nonminimal coupling between the scalar field and the nonmetricity scalar. We fo…

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Euclidean volume fluctuations in de Sitter quantum gravity

David Blanco, Guillem Perez-Nadal, Bruno Sivilotti · 2026

The Euclidean formulation of quantum gravity can be interpreted in terms of a probability distribution over Riemannian manifolds. In the context of de Sitter gravity, the statistics of the total volum…

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$\mathcal{H}$olographic $\mathcal{N}$aturalness and Information See-Saw Mechanism for Neutrinos

Andrea Addazi, Giuseppe Meluccio · 2026

The microscopic origin of the de Sitter entropy remains a central puzzle in quantum gravity related to the cosmological constant problem. Within $\mathcal{H}$olographic $\mathcal{N}$aturalness, we pro…

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Physics Preprint PDF DOI

$\mathcal{H}$olographic $\mathcal{N}$aturalness and Pre-Geometric Gravity

Andrea Addazi, Salvatore Capozziello, Giuseppe Meluccio · 2026

The cosmological constant (CC, $\Lambda$) problem represents a remarkable discrepancy of about 120 orders of magnitude between the observed dark energy and its natural expectation from quantum field t…

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