Abdel Pérez-Lorenzana

Assisted inflation via tachyon condensation.

In this paper we propose a new mechanism of inflating the Universe with non-BPS D4-branes which decay into stable D3-branes via tachyon condensation. In a single brane scenario the tachyon potential is very steep and unable to support inflation. However, if the universe lives in a stack of branes produced by a set of noninteracting unstable -branes, then the associated set of tachyons may drive inflation along our 3 spatial dimensions. After tachyon condensation the Universe is imagined to be filled with a set of parallel stable D3-branes. We study the scalar density perturbations and reheating within this setup.

Neutrino mass, proton decay and dark matter in TeV scale universal extra dimension models

We show how the problem of small neutrino masses and suppressed proton decay can be simultaneously resolved in 6D universal extra dimension models (UEDs) with a low fundamental scale using extended gauge groups that contain the local

Baryogenesis in theories with large extra spatial dimensions

Bensuremath{-}L

Left-Right Symmetry in 5-D and Neutrino Mass in TeV-scale Gravity Models

symmetry. The extra space dimensions are compactified either on a

A dynamical stabilization of the radion potential

{T}^{2}{/Z}_{2}

Small Dirac neutrino masses and R parity from anomalous U(1) symmetry

or

Affleck-Dine baryogenesis in large extra dimensions

{T}^{2}{/Z}_{2}ifmmodetimeselsetexttimesfi{}{Z}_{2}^{ensuremath{}}

Charge asymmetry in the brane world and the formation of charged black holes

orbifold depending on whether the full gauge group is

Affleck-Dine leptogenesis via right-handed sneutrino fields in a supersymmetric hybrid inflation model

{mathrm{SU}(2)}_{L}ifmmodetimeselsetexttimesfi{}{U(1)}_{{I}_{3R}}ifmmodetimeselsetexttimesfi{}{U(1)}_{Bensuremath{-}L}

Large lepton mixings induced by sterile neutrino

or