Production of massive stable particles in inflaton decay

Abstract

We point out that inflaton decays can be a copious source of stable or long--lived particles $\chi$ with mass exceeding the reheat temperature $T_R$. Once higher order processes are included, this statement is true for any $\chi$ particle with renormalizable (gauge or Yukawa) interactions. This contribution to the $\chi$ density often exceeds the contribution from thermal $\chi$ production, leading to significantly stronger constraints on model parameters than those resulting from thermal $\chi$ production alone. For example, we all but exclude models containing stable charged particles with mass less than half the mass of the inflaton.

4 revtex pages, 1 figure (uses axodraw). Slightly modified for better clarification, few changes in references. Final verssion published in Phys. Rev. Lett

References in corpus (2)

• Inflation with Low Reheat Temperature and Cosmological Constraint on Stable Charged Massive Particles
• Possible astrophysical signatures of heavy stable neutral relics in supergravity models

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