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Primordial equation of state transitions

Aditya Aravind*, Dustin Lorshbough†, and Sonia Paban‡

  • Department of Physics and Texas Cosmology Center, The University of Texas at Austin, Texas 78712, USA

  • *Aditya.phy@utexas.edu
  • †Lorsh@utexas.edu
  • ‡Paban@zippy.ph.utexas.edu
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Phys. Rev. D 93, 123519 – Published 16 June, 2016

DOI: https://doi.org/10.1103/PhysRevD.93.123519

Abstract

We revisit the physics of transitions from a general equation of state parameter to the final stage of slow-roll inflation. We show that it is unlikely for the modes comprising the cosmic microwave background to contain imprints from a preinflationary equation of state transition and still be consistent with observations. We accomplish this by considering observational consistency bounds on the amplitude of excitations resulting from such a transition. As a result, the physics which initially led to inflation likely cannot be probed with observations of the cosmic microwave background. Furthermore, we show that it is unlikely that equation of state transitions may explain the observed low multipole power suppression anomaly.

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Phys. Rev. D 93, 123519– Published 16 June, 2016
  • Received 26 April 2016
Article part of CHORUS

© 2016 American Physical Society

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