Cosmic Strings and the String Dilaton

Details Cosmic Strings and the String Dilaton Cosmic Strings and the String Dilaton

1996-10-03

arxiv.org/abs/gr-qc/9610005v1

Phys.Rev.Lett.78:2288-2291,1997

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

16 pages

Scientific paper

10.1103/PhysRevLett.78.2288

The existence of a dilaton (or moduli) with gravitational-strength coupling to matter imposes stringent constraints on the allowed energy scale of cosmic strings, $\eta$. In particular, superheavy gauge strings with $\eta \sim 10^{16} GeV$ are ruled out unless the dilaton mass $m_{\phi} \gsim 100 TeV$, while the currently popular value $m_{\phi} \sim 1 TeV$ imposes the bound $\eta \lsim 3 \times 10^{11} GeV$. Similar constraints are obtained for global topological defects. Some non-standard cosmological scenarios which can avoid these constraints are pointed out.

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