3 papers
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…
astro-ph.CO2025
Constraining the impact of standard model phase transitions on primordial black holes
Xavier Pritchard, Christian T. Byrnes
Phase transitions in the early universe lead to a reduction in the equation of state of the primordial plasma. This exponentially enhances the formation rate of primordial black ho…