Résultats pour « gr-qc »

Prépublication · 2026 arXiv EN

Searching for lensed gravitational waves with unlensed templates

Gravitational lensing can split the signal of a binary merger into two images, which either overlap and interfere or arrive as separate events. We show that the matched-filter output of every two-image template can be straightforwardly constructed from the sig...

Digvijay Wadekar, Barak Zackay et al. #gr-qc

Prépublication · 2026 arXiv EN

Primordial black holes in braneworld gravity: A gateway to hidden dimensions and the dark Universe

This thesis investigates the cosmological dynamics of primordial black holes (PBHs) within the Randall--Sundrum Type II braneworld scenario. The work comprises a preliminary discussion on gravitational collapse in the small-black-hole limit at early cosmologic...

Itzi Aldecoa-Tamayo #gr-qc

Prépublication · 2026 arXiv EN

The metric-affine $\mathring{R}^2$ scalaron: parameter-free inflation

We present a model of slow-roll inflation in metric-affine gravity, where the connection is independent of the metric. We require that the Einstein-Hilbert term is the only operator that breaks three out of four shift-symmetries of the connection, and impose t...

Christian Dioguardi #gr-qc

Prépublication · 2026 arXiv EN

All Quiet on the Vector Front: Scalar Growth and Perturbative Control in Horndeski--Weyl-squared Gravity

Higher-order curvature corrections to general relativity arise naturally in many fundamental theories and provide phenomenologically interesting low-energy effective field theories. However, higher-derivative terms can introduce ghost modes, which call the val...

Antonio De Felice, Guillem Domènech et al. #gr-qc

Prépublication · 2026 arXiv EN

A Pairwise Surrogate for Gravitational-Wave Spectra from Highly Relativistic Vacuum Bubble Collisions

Gravitational waves from vacuum first-order phase transitions probe the nonlinear dynamics of relativistic bubble collisions. Predicting their spectrum requires resolving Lorentz-contracted scalar bubble walls throughout a volume containing many bubbles, makin...

Malte Buschmann, Toby Opferkuch #gr-qc

Prépublication · 2026 arXiv EN

Holographic dark energy from generalized entropies and extended infrared cut-offs

We study holographic dark energy models constructed from generalized entropy functionals and local infrared cut-offs. Three entropies (Barrow and the three and five-parameter generalized entropies) are each combined with the Granda-Oliveros (GO) cut-off and tw...

Ke Chen, Simone D'Onofrio et al. #gr-qc