4 papers
Gravitational Waves from Multiple First-Order Phase Transitions in a Scenario with Early Matter Domination
Rouzbeh Allahverdi, Fazlollah Hajkarim
Non-standard cosmological histories with epochs of early matter domination (EMD) arise in various top-down models of the early universe. Typically, in the latter stage of EMD, temp…
Gravitational wave signatures of primordial black hole accretion during early matter domination
Rouzbeh Allahverdi, James B. Dent, Ngo Phuc Duc Loc +1
We present a scenario in which primordial black holes (PBHs) form in a post-inflationary radiation-dominated (RD) phase and then experience significant accretion during a phase of…
Enhanced Dark Matter Abundance in First-Order Phase Transitions
Rouzbeh Allahverdi, Cash Hauptmann, Peisi Huang
We propose a novel scenario to obtain the correct relic abundance for thermally under-produced dark matter. This scenario utilizes a strongly first-order phase transition at temper…
Conversations and Deliberations: Non-Standard Cosmological Epochs and Expansion Histories
Brian Batell, Keith R. Dienes, Brooks Thomas +17
This document summarizes the discussions which took place during the PITT-PACC Workshop entitled "Non-Standard Cosmological Epochs and Expansion Histories," held in Pittsburgh, Pen…