Cosmic Strings and the String Dilaton

Abstract

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 $m_ϕ \gsim 100 TeV$, while the currently popular value $m_{\varphi }\sim 1TeV$ imposes the bound $η\lsim 3 \times 10^{11} GeV$. Similar constraints are obtained for global topological defects. Some non-standard cosmological scenarios which can avoid these constraints are pointed out.

16 pages

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