Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-08-04
Phys.Rev.Lett. 79 (1997) 4525-4528
Physics
High Energy Physics
High Energy Physics - Phenomenology
13 pages (RevTex file including one figure, use psfig), revised version to be published in Physical Review Letters
Scientific paper
10.1103/PhysRevLett.79.4525
The dilaton field in string theories (if exists) is expected to have a mass of the order of the gravitino mass $m_{3/2}$ which is in a range of $10^{-2}$keV--1GeV in gauge-mediated supersymmetry breaking models. If it is the case, the cosmic energy density of coherent dilaton oscillation easily exceeds the critical density of the present universe. We show that even if this problem is solved by a late-time entropy production (thermal inflation) a stringent constraint on the energy density of the dilaton oscillation is derived from experimental upperbounds on the cosmic X($\gamma$)-ray backgrounds. This excludes an interesting mass region, $500keV \lesssim m_{3/2} \lesssim 1GeV$, in gauge-mediated supersymmetry breaking models.
Hashiba Jiro
Kawasaki Masahiro
Yanagida Takayuki
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