3 papers
astro-ph.CO2025
Testing scalar dark matter clumps with Pulsar Timing Arrays
Philippe Brax, Patrick Valageas
Scalar dark matter is a viable alternative to particle dark matter models such as Weakly Interacting Massive Particles (WIMPS). This is particularly the case for scalars with a low…
astro-ph.CO2025
Primordial gravitational waves in DHOST inflation
Philippe Brax, Andrei Lazanu
We consider DHOST inflationary models with a shift symmetry leading to a de Sitter space-time at the background cosmological level. Deviations from scale invariance of the scalar a…
astro-ph.CO2024
Formation of solitons and their transitions in scalar-field dark matter models with a non-polynomial self-interaction potential
Raquel Galazo García, Philippe Brax, Patrick Valageas
We study the formation of solitons inside scalar-field dark matter halos with a non-polynomial self-interaction potential. We consider a self-interaction potential that is quartic…