Fri - 12/05/25

There is no new related paper today

There is no new related paper today

Thu - 12/04/25

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There is no new related paper today

  1. [] - Title: Constraining Zero-Point Length from Gravitational Baryogenesis - Ava Shahbazi Sooraki, Ahmad Sheykhi

Wed - 12/03/25

**Title:

      Geometric Constraints on Quantum Gravity-Inspired Dispersion Relations**  - **Authors:** Gines R. Perez Teruel  - **Subjects:** Subjects: General Relativity and Quantum Cosmology (gr-qc)  - **Arxiv link:** [https://arxiv.org/abs/](https://arxiv.org/abs/)  - **Abstract**  Modified dispersion relations (MDRs) arise in many quantum-gravity approaches, often in non-polynomial or non-analytic form beyond the reach of effective field theory (EFT). Logarithmic, exponential and trigonometric MDRs appear in causal set theory, nonlocal gravity and $\kappa$-Poincaré models, while Loop Quantum Gravity (LQG) yields polymeric (sine), holonomy, inverse-triad and semiclassical corrections. Using the geometric framework of Ref.~\cite{GRP}, we analyse the intrinsic curvature of the associated energy--momentum surfaces, where negative curvature ensures hyperbolic and stable propagation, and curvature sign changes or critical points indicate kinematical instabilities or new invariant scales. We apply this method exhaustively to all major MDRs derived in LQG and find that they remain strictly hyperbolic in the entire phenomenologically relevant regime, with no elliptic patches or critical branching. The same framework provides universal constraints on representative logarithmic, exponential and trigonometric MDRs beyond EFT. Thus, geometric criteria yield a unified and coordinate-independent assessment of stability, thresholds and invariant scales, and demonstrate the robustness of MDRs emerging from LQG.

There is no new related paper today

  1. [] - Title: Non-singular cosmologies matching regular black holes - Shulan Li, Jian-Pin Wu, Xian-Hui Ge

Tue - 12/02/25

There is no new related paper today

There is no new related paper today

  1. [] - Title: Gravitational Spectra and Wave Propagation in Regular Black Holes Supported by a Dehnen Halo - Bekir Can Lütfüoğlu, Abubakir Shermatov, Javlon Rayimbaev, Muhammad Matyoqubov, Otaboyev Sirajiddin

Mon - 12/01/25

**Title:

      Quantum coherent dynamics of quasiclassical spacetimes**  - **Authors:** S. Wang, A. Sajeendran, D. Yeom, R. B. Mann, J. Foo  - **Subjects:** Subjects: General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Theory (hep-th); Quantum Physics (quant-ph)  - **Arxiv link:** [https://arxiv.org/abs/](https://arxiv.org/abs/)  - **Abstract**  In a wide range of quantum gravity theories, quasiclassical geometries, which are solutions to the Einstein field equations approximately, are described by "coherent states." Here we propose a Hamiltonian formalism for gravitational dynamics with respect to this coherent state basis, which generates time evolution of the spacetime with respect to a clock at infinity. Since the coherent states are not orthogonal, an initial quasiclassical geometry is dynamically driven into a superposition of different amplitudes. Our framework provides a dynamical mechanism for tunneling between geometries that is ubiquitous in a number of approaches to quantum gravity, from loop quantum gravity to the Euclidean path integral. We apply our framework to the problem of black hole evaporation, providing a hint at how unitarity may be preserved with the inclusion of quantum corrections to the semiclassical evolution of the black hole.

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