Cosmological gravitational particle production (CGPP) is the creation of particles in an
expanding universe due solely to their gravitational interaction. These particles can play an …

The theory of inflation with single and multiple fields is reviewed paying particular attention
to the dynamics of adiabatic and entropy/isocurvature perturbations which provide the …

We discuss the evolution of linear perturbations about a Friedmann-Robertson-Walker
background metric, using only the local conservation of energy momentum. We show that on …

We study adiabatic (curvature) and entropy (isocurvature) perturbations produced during a
period of cosmological inflation that is driven by multiple scalar fields with an arbitrary …

We study the general infrared behavior of the power spectrum of a stochastic gravitational
wave background produced by stress tensor in the form bilinear in certain dynamical …

We study gravitational wave production from gauge preheating in a variety of inflationary
models, detailing its dependence on both the energy scale and the shape of the potential …

We analytically calculate the scalar induced gravitational waves (SIGWs) and find a log-
dependent slope of SIGW in the infrared regions (f< fc), namely n GW (f)= 3-2/ln (fc/f), and n …

In many models of inflation, the period of accelerated expansion ends with preheating, a
highly non-thermal phase of evolution during which the inflaton pumps energy into a specific …

We consider gravitational wave production due to parametric resonance at the end of
inflation, or “preheating.” This leads to large inhomogeneities that source a stochastic …

We study the onset of the reheating epoch at the end of axion-driven inflation where the
axion is coupled to an Abelian, U (1), gauge field via a Chern-Simons interaction term. We …