Next Article in Journal / Special Issue
Quantum Yang–Mills Dark Energy
Previous Article in Journal
Acknowledgement to Reviewers of Universe in 2015
Previous Article in Special Issue
Chameleonic Theories: A Short Review
Article Menu
Issue 1 (March) cover image

Export Article

Open AccessArticle
Universe 2016, 2(1), 3; doi:10.3390/universe2010003

String-Inspired Gravity through Symmetries

Departamento Física, Facultad Ciencias Naturales, Universidad de Atacama, Copayapu 485, Copiapó, Chile
Academic Editors: Lorenzo Iorio, Kazuharu Bamba and Sergei D. Odintsov
Received: 23 June 2015 / Revised: 27 January 2016 / Accepted: 27 January 2016 / Published: 5 February 2016
(This article belongs to the Special Issue Modified Gravity Cosmology: From Inflation to Dark Energy)
View Full-Text   |   Download PDF [526 KB, uploaded 5 February 2016]   |  

Abstract

We study a string-inspired cosmological model from the symmetries point of view. We start by deducing the form that each physical quantity must take so that the field equations, in the string frame, admit self-similar solutions. In the same way, we formalize the use of power-law solutions (less restrictive than the self-similar ones) by studying the wave equation for the dilaton through the Lie group method. Furthermore, we show how to generate more solutions by using this approach. As examples, we calculate exact solutions to several cosmological models in the four-dimensional NS-NS (Neveu-Schwarz-Neveu-Schwarz) sector of low-energy effective string theory coupled to a dilaton and an axion-like H-field within the string frame background, with FRW and the Bianchi Type II metrics. We also study the existence of Noether symmetries, which allow us to determine the form of the physical quantities in the framework of FRW geometry and to find exact cosmological solutions. View Full-Text
Keywords: string-inspired cosmology; symmetry methods; exact solutions; FRW and Bianchi II models string-inspired cosmology; symmetry methods; exact solutions; FRW and Bianchi II models
Figures

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Belinchón, J.A. String-Inspired Gravity through Symmetries. Universe 2016, 2, 3.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Universe EISSN 2218-1997 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top