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Initial conditions problem in cosmological inflation revisited

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arxiv 2304.12150 v1 pith:BINFMFW5 submitted 2023-04-24 gr-qc astro-ph.COhep-th

Initial conditions problem in cosmological inflation revisited

classification gr-qc astro-ph.COhep-th
keywords conditionsinflationinitialproblembangbeginningcodecombined
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We present first results from a novel numerical relativity code based on a tetrad formulation of the Einstein-scalar field equations combined with recently introduced gauge/frame invariant diagnostics indicating that inflation does not solve the homogeneity and isotropy problem beginning from generic initial conditions following a big bang.

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  1. Starting inflation in asymptotically flat spacetimes

    gr-qc 2026-07 conditional novelty 6.0

    In asymptotically flat spacetimes, a localized inflaton fluctuation requires a proper size of at least ~2.5 times the inflationary scale to successfully seed inflation, generalizing the Goldwirth-Piran result.