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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

Initial Conditions for Inflation

classification hep-th astro-phgr-qchep-ph
keywords statesthermalvacuumsitteranisotropyapplybestcmbr
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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Forward citations

Cited by 2 Pith papers

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

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

    gr-qc 2026-03 conditional novelty 6.0

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

  2. Long Inflation Screens Euclidean-Wormhole Initial States

    hep-ph 2026-05 unverdicted novelty 4.0

    Long inflation screens Euclidean wormhole initial states from the CMB, turning them into Bunch-Davies predictions and providing a bound on inflationary duration via visibility limits on Bogoliubov excitations.