This article describes the various experimental bounds on the variation of the fundamental
constants of nature. After a discussion of the role of fundamental constants, their definition …

We review recent work on the possibility of a varying speed of light (VSL). We start by
discussing the physical meaning of a varying-c, dispelling the myth that the constancy of c is …

D-branes are by now an integral part of our toolbox towards understanding nature. In this
review, we will describe recent progress in their use to realize fundamental interactions. The …

We study the linear perturbations of multi-field inflationary models governed by a
Lagrangian which is a general function of the scalar fields and of a global kinetic term …

We study cosmological perturbations in general inflation models with multiple scalar fields
and arbitrary kinetic terms, with special emphasis on the multifield extension of Dirac-Born …

String gas cosmology is a string theory-based approach to early universe cosmology that is
based on making use of robust features of string theory such as the existence of new states …

This is a review of aspects of D‐brane applications to particle physics and cosmology. D‐
branes provide interesting alternatives to standard unification of interactions. Moreover they …

We study multifield aspects of Dirac-Born-Infeld (DBI) inflation. More specifically, we
consider an inflationary phase driven by the radial motion of a D-brane in a conical throat …

We study a cosmological scenario in which the DBI action governing the motion of a D3-
brane in a higher-dimensional spacetime is supplemented with an induced gravity term. The …

We build an effective field theory of multifield inflationary fluctuations based on the adiabatic
perturbation and any number of matter fluctuations in the nonadiabatic sector, without …