Matter creation via vacuum fluctuations in the early Universe and observed ultrahigh energy cosmic ray events

被引：161

作者：

Kuzmin, V ^{[1
]}

Tkachev, I

机构：

[1] Russian Acad Sci, Inst Nucl Res, 60th October Anniversary Prosp 7A, Moscow 117312, Russia

[2] Purdue Univ, Dept Phys, W Lafayette, IN 47907 USA

来源：

PHYSICAL REVIEW D | 1999年 / 59卷 / 12期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevD.59.123006

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Cosmic rays of the highest energy, above the Greisen-Zatsepin-Kuzmin cutoff of the spectrum, may originate in decays of superheavy long-living X particles. These particles may be produced in the early Universe from vacuum fluctuations during or after inflation and may constitute a considerable fraction of cold dark matter. We calculate numerically their abundance for a wide range of models. X particles are considered to be either bosons or fermions. Particles that are several times heavier than the inflaton, m(inflaton) approximate to 10(13) GeV, and were produced by this mechanism, can account for the critical mass in the Universe naturally. In some cases induced isocurvature density fluctuations can leave an imprint in the anisotropy of cosmic microwave background radiation. [S0556-2821(99)07010-1].

引用

页数：8

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