Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-04-23
Phys.Rev. D60 (1999) 103518
Physics
High Energy Physics
High Energy Physics - Phenomenology
13 pages (RevTex file) including 8 figures, revised version to be published in Physical Review D
Scientific paper
10.1103/PhysRevD.60.103518
The thermal inflation is the most plausible mechanism that solves the cosmological moduli problem naturally. We discuss relic abundance of superheavy particle $X$ in the presence of the thermal inflation assuming that its lifetime is longer than the age of the universe, and show that the long-lived particle $X$ of mass $10^{12}$--$10^{14}$ GeV may form a part of the dark matter in the present universe in a wide region of parameter space of the thermal inflation model. The superheavy dark matter of mass $\sim 10^{13}$ GeV may be interesting in particular, since its decay may account for the observed ultra high-energy cosmic rays if the lifetime of the $X$ particle is sufficiently long.
Asaka Takehiko
Kawasaki Masahiro
Yanagida Takayuki
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