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Initial Conditions for Inflation

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arxiv hep-th/0209231 v1 pith:3IS5IGUG submitted 2002-09-26 hep-th astro-phgr-qchep-ph

Nemanja Kaloper , Matthew Kleban , Albion Lawrence , Stephen Shenker , Leonard Susskind This is my paper · ORCID
classification hep-thastro-phgr-qchep-ph
keywords statesthermalvacuumsitteranisotropyapplybestcmbr
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Free scalar fields in de Sitter space have a one-parameter family of states invariant under the de Sitter group, including the standard thermal vacuum. We show that, except for the thermal vacuum, these states are unphysical when gravitational interactions are included. We apply these observations to the quantum state of the inflaton, and find that, at best, dramatic fine tuning is required for states other than the thermal vacuum to lead to observable features in the CMBR anisotropy.

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Cited by 2 Pith papers

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

  1. The effects of non Bunch-Davies initial conditions on gravitationally produced relics

    gr-qc 2026-03 conditional novelty 6.0 of 10

    Non-Bunch–Davies initial conditions can drastically change gravitationally produced vector dark matter abundances, opening a wider viable mass range.

  2. Analytic Gravitational Wave Spectrum in Next-to-Minimal Bouncing Cosmology

    astro-ph.CO 2025-07 conditional novelty 6.0 of 10

    A five-phase bouncing cosmology yields a broken power-law gravitational wave spectrum whose amplitude bound automatically keeps the bounce energy below the Planck scale.

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