From the 4 of 15 linked papers with an AI index.
15 papers
Light propagation and intensity transport in metric-affine geometry
Antonio De Felice, Lavinia Heisenberg, Gonzalo J. Olmo +1
The paper investigates how electromagnetic waves travel in spacetimes with torsion and non‑metricity, constructing gauge‑invariant models that can alter light cones, cause birefrin…
Minimally modified gravity with Laplacian auxiliary constraints and an inflationary realization
Jakkrit Sangtawee, Antonio De Felice, Khamphee Karwan
The paper proposes a minimally modified gravity theory that retains only two tensorial gravitational degrees of freedom by introducing Laplacian‑coupled auxiliary constraints, and…
Defocusing dark energy: Raychaudhuri diagnostics beyond and the phantom divide
Ãzgür Akarsu, Antonio De Felice, N. Merve Uzun
In general relativity, cosmic acceleration is timelike defocusing of the comoving congruence and requires a negative total active gravitational mass density, $\mathcal{M}_{\rm tot}…
Evading Cosmological Strong Coupling in Non-minimally Coupled Vector Gravity
Antonio De Felice, Seishi Enomoto, Nagisa Hiroshima +1
Recent analyses of Proca theories with non-minimal curvature couplings have uncovered an additional scalar degree of freedom with an identically vanishing propagation speed, $c_s^2…
Static regular black holes in Horndeski theories: analytic no-go and nonanalytic obstructions
Antonio De Felice, Shinji Tsujikawa
The paper analyzes static, spherically symmetric black hole solutions in Horndeski scalar‑tensor theories and shows that generic regular horizons are obstructed by instabilities, l…
Data-Driven Discovery of a Simple Phantom-Crossing Dark Energy Parametrization
Giulia Borghetto, Ameek Malhotra, Simran Arora +4
We develop a data-driven reconstruction programme for the dark-energy equation of state within VCDM, a minimally modified gravity framework in which both background and linear pert…