DBI Galileon inflation in background SUGRA

TL;DR

This paper develops a supergravity-based inflation model using DBI Galileon theory derived from brane-antibrane systems, analyzing primordial fluctuations and comparing predictions with WMAP7 data.

Contribution

It introduces a novel potential-driven DBI Galileon inflation model within N=1 supergravity derived from higher-dimensional brane configurations.

Findings

Model produces observable parameters consistent with WMAP7 data.

Effective potential exhibits Coleman-Weinberg type features.

Analysis includes both de Sitter and beyond de Sitter regimes.

Abstract

We introduce a model of potential driven DBI Galileon inflation in background N=1,D=4 SUGRA. Starting from D4-$\bar{D4}$ brane-antibrane in the bulk N=2,D=5 SUGRA including quadratic Gauss-Bonnet corrections, we derive an effective N=1,D=4 SUGRA by dimensional reduction, that results in a Coleman-Weinberg type Galileon potential. We employ this potential in modeling inflation and in subsequent study of primordial quantum fluctuations for scalar and tensor modes. Further, we estimate the major observable parameters in both de Sitter (DS) and beyond de Sitter (BDS) limits and confront them with recent observational data from WMAP7 by using the publicly available code CAMB.