Post-inflationary gravitino production revisited

Ellis, John; Garcia, Marcos A.G.; Olive, Keith A.; Nanopoulos, Dimitri V.; Peloso, Marco

doi:10.1088/1475-7516/2016/03/008

Title: Post-inflationary gravitino production revisited

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Abstract

We revisit gravitino production following inflation. As a first step, we review the standard calculation of gravitino production in the thermal plasma formed at the end of post-inflationary reheating when the inflaton has completely decayed. Next we consider gravitino production prior to the completion of reheating, assuming that the inflaton decay products thermalize instantaneously while they are still dilute. We then argue that instantaneous thermalization is in general a good approximation, and also show that the contribution of non-thermal gravitino production via the collisions of inflaton decay products prior to thermalization is relatively small. Our final estimate of the gravitino-to-entropy ratio is approximated well by a standard calculation of gravitino production in the post-inflationary thermal plasma assuming total instantaneous decay and thermalization at a time t ≅ 1.2/Γ{sub φ}. Finally, in light of our calculations, we consider potential implications of upper limits on the gravitino abundance for models of inflation, with particular attention to scenarios for inflaton decays in supersymmetric Starobinsky-like models.

Authors:

Ellis, John ^[1]; Garcia, Marcos A.G.; Olive, Keith A. ^[2]; Nanopoulos, Dimitri V. ^[3]; Peloso, Marco ^[4]

Theoretical Particle Physics and Cosmology Group, Department of Physics, King's College London, London WC2R 2LS (United Kingdom)
William I. Fine Theoretical Physics Institute, School of Physics and Astronomy, University of Minnesota, 116 Church Street SE, Minneapolis, MN 55455 (United States)
George P. and Cynthia W. Mitchell Institute for Fundamental Physics and Astronomy, Texas A and M University, College Station, TX 77843 (United States)
School of Physics and Astronomy and Minnesota Institute for Astrophysics, University of Minnesota, 116 Church Street SE, Minneapolis, MN 55455 (United States)

Publication Date:: Tue Mar 01 00:00:00 EST 2016

OSTI Identifier:: 22524967

Resource Type:: Journal Article

Journal Name:: Journal of Cosmology and Astroparticle Physics

Additional Journal Information:: Journal Volume: 2016; Journal Issue: 03; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516

Country of Publication:: United States

Language:: English

Subject:: 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; APPROXIMATIONS; COSMOLOGICAL INFLATION; ENTROPY; GRAVITINOS; INFLATIONARY UNIVERSE; INFLATONS; PARTICLE DECAY; PLASMA; POTENTIALS; REVIEWS; SUPERSYMMETRY; THERMALIZATION; VISIBLE RADIATION

Citation Formats


                    Ellis, John, Garcia, Marcos A.G., Olive, Keith A., Nanopoulos, Dimitri V., and Peloso, Marco. Post-inflationary gravitino production revisited.  United States: N. p., 2016. 
        Web.  doi:10.1088/1475-7516/2016/03/008.

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                    Ellis, John, Garcia, Marcos A.G., Olive, Keith A., Nanopoulos, Dimitri V., & Peloso, Marco. Post-inflationary gravitino production revisited.  United States.  https://doi.org/10.1088/1475-7516/2016/03/008

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                    Ellis, John, Garcia, Marcos A.G., Olive, Keith A., Nanopoulos, Dimitri V., and Peloso, Marco. 2016.  
        "Post-inflationary gravitino production revisited".  United States.  https://doi.org/10.1088/1475-7516/2016/03/008.

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@article{osti_22524967,

  title        = {Post-inflationary gravitino production revisited},

  author       = {Ellis, John and Garcia, Marcos A.G. and Olive, Keith A. and Nanopoulos, Dimitri V. and Peloso, Marco},

  abstractNote = {We revisit gravitino production following inflation. As a first step, we review the standard calculation of gravitino production in the thermal plasma formed at the end of post-inflationary reheating when the inflaton has completely decayed. Next we consider gravitino production prior to the completion of reheating, assuming that the inflaton decay products thermalize instantaneously while they are still dilute. We then argue that instantaneous thermalization is in general a good approximation, and also show that the contribution of non-thermal gravitino production via the collisions of inflaton decay products prior to thermalization is relatively small. Our final estimate of the gravitino-to-entropy ratio is approximated well by a standard calculation of gravitino production in the post-inflationary thermal plasma assuming total instantaneous decay and thermalization at a time t ≅ 1.2/Γ{sub φ}. Finally, in light of our calculations, we consider potential implications of upper limits on the gravitino abundance for models of inflation, with particular attention to scenarios for inflaton decays in supersymmetric Starobinsky-like models.},

  doi          = {10.1088/1475-7516/2016/03/008},

  url          = {https://www.osti.gov/biblio/22524967},
  journal      = {Journal of Cosmology and Astroparticle Physics},

  issn         = {1475-7516},

  number       = 03,

  volume       = 2016,

  place        = {United States},

  year         = {Tue Mar 01 00:00:00 EST 2016},

  month        = {Tue Mar 01 00:00:00 EST 2016}

}

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