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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

classification gr-qcastro-ph.COhep-th
keywords conditionsinflationinitialproblembangbeginningcodecombined
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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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Cited by 3 Pith papers

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

  1. Starting inflation in asymptotically flat spacetimes

    gr-qc 2026-07 conditional novelty 6.0 of 10

    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.

  2. Probability of the Initial Conditions for Inflation and Slow Contraction

    gr-qc 2025-05 conditional novelty 6.0 of 10

    A probability estimate for scalar-field homogeneity at the onset of inflation and slow contraction concludes that, after optimizing over initial spectra, inflation is vastly more likely than ekpyrosis to have the requ...

  3. Inflaton Dynamics in Higher-Derivative Scalar-Tensor Theories of Gravity

    gr-qc 2025-05 conditional novelty 6.0 of 10

    In the weakly coupled regime of a four-derivative scalar-tensor theory, large inflationary inhomogeneities decay just as in general relativity, and only finely tuned initial data can escape the effective field theory'...

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