A seemingly simple question, how does warm inflation exit gracefully?, has a more complex answer than in cold paradigm. It been highlighted here that whether exits gracefully depends on three independent choices: The form of the potential, choice model (i.e., its dissipative coefficient) and regime, weak or strong dissipation, characterizing dynamics. Generic conditions slow-roll parameters sev...

Beam is a program that synthesizes file trees from one or more source file trees. An instruction file contains the synthesis rules. The simplest form of a synthesis is making the destination tree an exact copy of a single source tree. If the destination tree already exists, it is verified for consistency with the sources and the synthesis rules. Updates occur when inconsistencies are detected. ...

We reexamine the graceful exit problem in the Pre-Big-Bang inflationary scenario. The dilaton-gravity action is generalized by adding the axion and a general axion/dilaton potential. We provide a phase space analysis of the dynamics which leads us to extend the previous no-go theorem and rule out the branch change necessary for graceful exit in this context. Submitted to Physics Letters B

We confront the recent proposal of Emerging Brane Inflation with WMAP3+SDSS, finding a scalar spectral index of ns = 0.9659 +0.0049 −0.0052 in excellent agreement with observations. The proposal incorporates a preceding phase of isotropic, non accelerated expansion in all dimensions, providing suitable initial conditions for inflation. Additional observational constraints on the parameters of t...

We re-examine the graceful exit problem in the pre-Big Bang scenario of string cosmology, by considering the most general time-dependent classical correction to the Lagrangian with up to four derivatives. By including possible forms for quantum loop corrections we examine the allowed region of parameter space for the coupling constants which enable our solutions to link smoothly the two asympto...