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String Theory and the First Half of the Universe

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arxiv 2401.04064 v2 pith:KMNDKH6U submitted 2024-01-08 hep-th astro-ph.COhep-ph

Fien Apers , Joseph P. Conlon , Edmund J. Copeland , Martin Mosny , Filippo Revello This is my paper · ORCID
classification hep-thastro-ph.COhep-ph
keywords stringycosmologiesfieldcomparedconventionalcosmologicalepochshalf
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We perform a detailed study of stringy moduli-driven cosmologies between the end of inflation and the commencement of the Hot Big Bang, including both the background and cosmological perturbations: a period that can cover half the lifetime of the universe on a logarithmic scale. Compared to the standard cosmology, stringy cosmologies motivate extended kination, tracker and moduli-dominated epochs involving significantly trans-Planckian field excursions. Conventional effective field theory is unable to control Planck-suppressed operators and so such epochs require a stringy completion for a consistent analysis. Perturbation growth in these stringy cosmologies is substantially enhanced compared to conventional cosmological histories. The transPlanckian field evolution results in radical changes to Standard Model couplings during this history and we outline potential applications to baryogenesis, dark matter and gravitational wave production.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Self-Tracking Solutions for Asymptotic Scalar Fields

    hep-th 2025-07 conditional novelty 7.0 of 10

    The self-perturbations of a scalar field on an exponential potential can act as an effective radiation background, producing a self-tracking solution with the familiar radiation tracker fixed point.

  2. Screened Axio-dilaton Cosmology: Novel Forms of Early Dark Energy

    hep-th 2025-05 conditional novelty 7.0 of 10

    A screened axio-dilaton dark energy model produces a self-terminating early dark energy phase from axion-matter couplings, reaching a few percent of the total density, and stronger dilaton-matter couplings decrease th...

  3. Cosmic superstrings in large volume compactifications: PTAs, LISA and time-varying tension

    astro-ph.CO 2025-04 conditional novelty 7.0 of 10

    Cosmic superstrings with a time-varying tension in large-volume string compactifications generically predict a LISA-band spectral drop and a high-frequency f^4 boost, encoding the mass and decay of the volume modulus.

  4. Remarks on brane-antibrane inflation

    hep-th 2025-01 conditional novelty 2.0 of 10

    The paper reviews how a perfect-square structure in the scalar potential can stabilize the volume modulus and evade the eta problem in brane-antibrane inflation.

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