We examine how reheating occurs after brane-antibrane inflation in warped geometries, such as those which have recently been considered for Type IIB string vacua. We adopt the standard picture thatâ€¦ (More)

We study the possibility of obtaining large nongaussian signatures in the Cosmic Microwave Background in a general class of single-field nonlocal hill-top inflation models. We estimate theâ€¦ (More)

We show that the naive application of the Kibble mechanism seriously underestimates the initial density of cosmic superstrings that can be formed during the annihilation of D-branes in the earlyâ€¦ (More)

Differential equations of infinite order are an increasingly important class of equations in theoretical physics. Such equations are ubiquitous in string field theory and have recently attractedâ€¦ (More)

We construct approximate inflationary solutions rolling away from the unstable maximum of p-adic string theory, a nonlocal theory with derivatives of all orders. Novel features include the existenceâ€¦ (More)

The inflationary paradigm has enjoyed phenomenological success; however, a compelling particle physics realization is still lacking. Axions are among the best-motivated inflaton candidates, since theâ€¦ (More)

Certain configurations of D-branes, for example wrong dimensional branes or the brane-antibrane system, are unstable to decay. This instability is described by the appearance of a tachyonic mode inâ€¦ (More)

In our previous work the nonlinearity parameter fNL, which characterizes nongaussianity in the cosmic microwave background, was estimated for a class of inflationary models based on nonlocal fieldâ€¦ (More)

Infinite order differential equations have come to play an increasingly significant role in theoretical physics. Field theories with infinitely many derivatives are ubiquitous in string field theoryâ€¦ (More)

We study (p)reheating in modular (closed string) inflationary scenarios, with a special emphasis on KÃ¤hler moduli/Roulette models. It is usually assumed that reheating in such models occurs throughâ€¦ (More)