The dilaton as a candidate for dark matter

Abstract

We examine consequences of the stabilization of the dilaton through the axion. An estimate of the resulting dilaton potential yields a relation between the axion parameter $m_a{f}_{PQ}$ and the average instanton radius, and predicts the ratio between the dilaton mass $m_{\varphi }$ and the axion mass $m_a$. If we identify the string axion with a Peccei--Quinn axion, then $m_{\varphi }{m}_{Pl}\sim m_a{f}_{PQ}$, and the dilaton should be strongly aligned $\sqrt{<{\varphi }^2>}\le 10^{-4}{m}_{Pl}$ at the QCD scale, in order not to overclose the universe.

9 pages, LaTex, uses amssymb

References in corpus (2)

• Dilaton Stabilization in the Context of Dynamical Supersymmetry Breaking through Gaugino Condensation
• AXIONS IN ASTROPHYSICS AND COSMOLOGY