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Matter Creation via Vacuum Fluctuations in the Early Universe and Observed Ultra-High Energy Cosmic Ray Events

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arxiv hep-ph/9809547 v1 pith:5FR7QAE4 submitted 1998-09-28 hep-ph

V. A. Kuzmin , I. I. Tkachev This is my paper · ORCID
classification hep-ph
keywords cosmicfluctuationsuniverseearlyenergyinflatonmatterparticles
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Cosmic rays of the highest energy, above the Greisen-Zatsepin-Kuzmin cut-off 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 inflaton, m_inflaton \approx 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 anisotropy of cosmic microwave background radiation.

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Cited by 4 Pith papers

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    In the quartic T-model, inflaton decay to fermions is strongly suppressed by Pauli blocking and parametric resonance, so fermion-only reheating is effectively impossible unless y ≳ 0.2 or a scalar channel is added.

  3. Gravitational Dark Matter Production in Supergravity $\alpha$-Attractor Inflation

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    Supergravity corrections in α-attractor inflation suppress gravitational dark matter production and shift the required reheating temperature to 10^3-10^7 GeV.

  4. Stochastic Gravitational Waves from Modulated Reheating

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    A spectator scalar in modulated reheating with large Higgs-like couplings generates detectable scalar-induced stochastic gravitational waves for BBO and DECIGO, but only outside perturbative low-energy extrapolations.

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