Dynamical string tension in string theory with spacetime Weyl invariance

I. Bars, P. J. Steinhardt, N. Turok

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

The fundamental string length, which is an essential part of string theory, explicitly breaks scale invariance. However, in field theory we demonstrated recently that the gravitational constant, which is directly related to the string length, can be promoted to a dynamical field if the standard model coupled to gravity (SM+GR) is lifted to a locally scale (Weyl) invariant theory. The higher gauge symmetry reveals previously unknown field patches whose inclusion turn the classically conformally invariant SM+GR into a geodesically complete theory with new cosmological and possibly further physical consequences. In this paper this concept is extended to string theory by showing how it can be "Weyl lifted" with a local scale symmetry acting on target space background fields. In this process the string tension (fundamental string length) is promoted to a dynamical field, in agreement with the parallel developments in field theory. We then propose a string theory in a geodesically complete cosmological stringy background which suggests previously unimagined directions in the stringy exploration of the very early universe. In field theory the authors demonstrated recently that the gravitational constant, which is directly related to the string length, can be promoted to a dynamical field if the standard model coupled to gravity (SM+GR) is lifted to a locally scale (Weyl) invariant theory.

Original languageEnglish (US)
Pages (from-to)901-920
Number of pages20
JournalFortschritte der Physik
Volume62
Issue number11-12
DOIs
StatePublished - Nov 1 2014

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Keywords

  • String tension
  • Weyl invariance

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