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    Equation of State and Duration to Radiation Domination after Inflation

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    Author
    Lozanov, Kaloian D.; Amin, Mustafa A.
    Date
    2017
    Abstract
    We calculate the equation of state after inflation and provide an upper bound on the duration before radiation domination by taking the nonlinear dynamics of the fragmented inflaton field into account. A broad class of single-field inflationary models with observationally consistent flattening of the potential at a scale M away from the origin, V ( ϕ ) ∝ | ϕ | 2 n near the origin, and where the couplings to other fields are ignored, is included in our analysis. We find that the equation of state parameter w → 0 for n = 1 and w → 1 / 3 (after sufficient time) for n ≳ 1 . We calculate how the number of e -folds to radiation domination depends on both n and M when M ∼ m Pl , whereas when M ≪ m Pl , we find that the duration to radiation domination is negligible. Our results are explained in terms of a linear instability analysis in an expanding universe and scaling arguments, and are supported by 3 + 1 -dimensional lattice simulations. We show that our upper bound on the postinflationary duration before radiation domination reduces the uncertainty in inflationary observables even when couplings to additional light fields are included (at least under the assumption of perturbative decay).
    Citation
    Lozanov, Kaloian D. and Amin, Mustafa A.. "Equation of State and Duration to Radiation Domination after Inflation." Physical Review Letters, 119, no. 6 (2017) American Physical Society: https://doi.org/10.1103/PhysRevLett.119.061301.
    Published Version
    https://doi.org/10.1103/PhysRevLett.119.061301
    Type
    Journal article
    Publisher
    American Physical Society
    Citable link to this page
    https://hdl.handle.net/1911/97775
    Rights
    Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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    • Faculty Publications [4988]
    • Physics and Astronomy Publications [1771]

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    Home | FAQ | Contact Us | Privacy Notice | Accessibility Statement
    Managed by the Digital Scholarship Services at Fondren Library, Rice University
    Physical Address: 6100 Main Street, Houston, Texas 77005
    Mailing Address: MS-44, P.O.BOX 1892, Houston, Texas 77251-1892
    Site Map