4 papers
Alleviating the Hubble Tension with Smooth Sign-Switching Dark Energy: Full CMB Constraints with DESI and PantheonPlus
Mariam Bouhmadi-López, Hsu-Wen Chiang, Beñat Ibarra-Uriondo
Sign-switching dark energy has recently been proposed as a minimal modification of the late-time expansion history aimed at alleviating tensions within the standard cosmological mo…
Cosmological tensions in Proca-Nuevo theory
Hsu-Wen Chiang, Claudia de Rham, Sebastian Garcia-Saenz +1
We study the cosmological predictions of (extended) Proca-Nuevo theory. This vector-tensor theory enjoys stable homogeneous and isotropic solutions characterized by an effective da…
No-go theorem for spontaneous vectorization
Hsu-Wen Chiang, Sebastian Garcia-Saenz, Aofei Sang
Generalized vector-tensor theories of gravity have drawn attention for admitting hairy black hole solutions, thereby circumventing the standard no-hair theorems. It remains an open…
Black hole destabilization via trapped quasi-normal modes
Hsu-Wen Chiang, Sebastian Garcia-Saenz, Aofei Sang
In the presence of non-minimal gravitational couplings, matter field perturbations on a static black hole spacetime may develop unphysical poles in their linearized equations. Phys…