4 papers
Energy-independent neutrino dephasing from an ultralight axion-like background
B. A. Couto e Silva, B. L. Sánchez-Vega
We study neutrino oscillations in an ultralight axion-like particle (ALP) dark-matter background using a bottom-up derivative interaction for active neutrinos. For couplings diagon…
Strong First-Order Electroweak Phase Transition and Gravitational Waves in a Fermion-Scalar Dark Matter Model
J. P. Carvalho-Corrêa, J. P. Cunha-Melo, I. M. Pereira +2
We investigate whether a minimal -symmetric fermion-scalar extension of the Standard Model can simultaneously realise viable dark matter, a strong electroweak phase t…
Photon Propagation through Axion Clouds around Magnetized Compact Objects: Time Delays and Polarimetric Signatures
M. M. Chaichian, B. A. Couto e Silva, B. L. Sánchez-Vega
Temporal offsets between Gamma-Ray Bursts (GRBs) and high-energy neutrinos probe propagation effects in extreme astrophysical environments. We investigate whether such offsets can…
Mixed Freeze-In and Freeze-Out Histories and Dark-Sector Decays in a Two-Scalar Model
J. P. Carvalho-Corrêa, B. A. Couto e Silva, B. L. Sánchez-Vega
We present a systematic non-equilibrium analysis of a renormalisable Higgs-portal dark sector with a complex scalar and a real scalar , including conversi…