A New Mechanism for Bubble Nucleation: Classical Transitions (2009)
Easther, Richard, Giblin Jr, John T., Hui, Lam, Lim, Eugene A.
Given a scalar field with metastable minima, bubbles nucleate quantum mechanically. When bubbles collide, energy stored in the bubble walls is converted into kinetic energy of the field. This kinetic...
Battefeld, Diana, Battefeld, Thorsten, Giblin Jr, John T.
We investigate the feasibility of explosive particle production via parametric resonance or tachyonic preheating in multi-field inflationary models by means of lattice simulations. We observe a...
GUT-Scale Primordial Black Holes: Consequences and Constraints (2008)
Anantua, Richard, Easther, Richard, Giblin Jr, John T.
We consider signatures of very light primordial black holes which evaporate before primordial nucleosynthesis begins. This population is unconstrained unless one assumes that the decaying black holes...
Thermal Inflation and the Gravitational Wave Background (2008)
Easther, Richard, Giblin Jr, John T., Lim, Eugene A., Park, Wan-Il, Stewart, Ewan D.
We consider the impact of thermal inflation -- a short, secondary period of inflation that can arise in supersymmetric scenarios -- on the stochastic gravitational wave background. We show that while...
Gravitational Waves From the End of Inflation: Computational Strategies (2007)
Easther, Richard, Giblin Jr, John T., Lim, Eugene A.
Parametric resonance or preheating is a plausible mechanism for bringing about the transition between the inflationary phase and a hot, radiation dominated universe. This epoch results in the rapid...
Gravitational Wave Production At The End Of Inflation (2006)
Easther, Richard, Giblin Jr, John T., Lim, Eugene A.
We consider gravitational wave production due to parametric resonance at the end of inflation, or ``preheating''. This leads to large inhomogeneities which source a stochastic background of...
The Hubble Slow Roll Expansion for Multi Field Inflation (2005)
Easther, Richard, Giblin Jr, John T
We examine the dynamics of inflation driven by multiple, interacting scalar fields and derive a multi field version of the Hubble slow roll expansion. We show that the properties of this expansion...
Spacetime Slices and Surfaces of Revolution (2004)
Giblin Jr, John T., Hwang, Andrew D.
Under certain conditions, a $(1+1)$-dimensional slice $\hat{g}$ of a spherically symmetric black hole spacetime can be equivariantly embedded in $(2+1)$-dimensional Minkowski space. The embedding...
Spacetime Embedding Diagrams for Spherically Symmetric Black Holes (2003)
Giblin Jr, John T., Marolf, Donald, Garvey, Robert H.
We show that it is possible to embed the 1+1 dimensional reduction of certain spherically symmetric black hole spacetimes into 2+1 Minkowski space. The spacetimes of interest (Schwarzschild...