7 papers
Primordial Black Holes in a Radiation-Dominated Universe
Thomas W. Baumgarte, Katy Clough, Mary Gerhardinger +2
Primordial fluctuations frozen out during inflation re-enter the cosmological horizon and can collapse, leading to the formation of primordial black holes. We perform simulations o…
Restrictions on Initial Conditions in Cosmological Scenarios and Implications for Simulations of Primordial Black Holes and Inflation
Thomas W. Baumgarte, Katy Clough, John T. Giblin
Numerical relativity simulations provide a means by which to study the evolution and end point of strong over-densities in cosmological spacetimes. Specific applications include st…
Primordial Black Holes from Kinetic Preheating
Peter Adshead, Eve Currens, John T. Giblin
We demonstrate that violent kinetic preheating following inflation can lead to the formation of black holes in the early Universe. In -attractor models with derivative inflaton…
Cosmological Moduli and Non-perturbative Production of Axions
Robert Wiley Deal, Leia Barrowes, John T. Giblin +3
Cosmological moduli generically come to dominate the energy density of the early universe, and thereby trigger an early matter dominated era. Such non-standard cosmological histori…
The Effect of Nonlinear Gravity on the Cosmological Background During Preheating
Ryn Grutkoski, Hayley J. Macpherson, John T. Giblin +1
We use numerical relativity to study the violent preheating era at the end of inflation. This epoch can result in highly nonlinear fluctuations in density and gravitational potenti…
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…