3 papers
astro-ph.CO2026
Bumpy inflation from explosive particle production
Kaloian D. Lozanov, Xavier Pritchard, Misao Sasaki
We present a first-principles derivation of an effective inflaton potential with a bumpy feature. We consider the coupling of a spectator field χto the inflaton ϕsuch that χis mass…
astro-ph.CO2025
Beyond Standard Model equation of state and primordial black holes
Xavier Pritchard, Matthew Starbuck, Wingfung Leung
The Standard Model of particle physics successfully describes all known fundamental particles and their interactions; however, it leaves several unanswered questions. Theories beyo…
astro-ph.CO2025
Robust μ-distortion constraints on primordial supermassive black holes from cubic (gNL) non-Gaussian perturbations
Xavier Pritchard, Christian T. Byrnes, Julien Lesgourgues +1
We make the first calculation of the spectral distortion constraints on the primordial curvature power spectrum in the limit of large cubic non-Gaussianity. This calculation involv…