3 papers
astro-ph.CO2025
Inflationary magnetogenesis beyond slow-roll and its induced gravitational waves
Bill Atkins, Debika Chowdhury, Alisha Marriott-Best +1
The origin of magnetic fields observed on both astrophysical and cosmological scales is a compelling problem that has the potential to shed light on the early Universe. We analytic…
gr-qc2024
A novel probe of graviton dispersion relations at nano-Hertz frequencies
Bill Atkins, Ameek Malhotra, Gianmassimo Tasinato
We generalise Phinney's 'practical theorem' to account for modified graviton dispersion relations motivated by certain cosmological scenarios. Focusing on specific examples, we sho…
gr-qc2023
Hidden conformal symmetries for black holes in modified gravity
Bill Atkins, Gianmassimo Tasinato
We determine hidden conformal symmetries behind the evolution equations of black hole perturbations in a vector-tensor theory of gravity. Such hidden symmetries are valid everywher…