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Strongly Coupled CFT in FRW Universe from AdS/CFT Correspondence

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arxiv hep-th/0101164 v2 pith:XKIACRXV submitted 2001-01-25 hep-th astro-phgr-qc

Kazuya Koyama , Jiro Soda This is my paper · ORCID
classification hep-thastro-phgr-qc
keywords spacetimeactioncurvedboundaryconformalcorrespondencecountercoupled
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We develop a formalism to calculate the effective action of the strongly coupled conformal field theory (CFT) in curved spacetime. The effective action of the CFT is obtained from AdS/CFT correspondence. The anti de-Sitter (AdS) spacetime has various slicing which give various curved spacetime on its boundary. We show the de Sitter spacetime and the Friedmann-Robertson-Walker (FRW) universe can be embedded in the AdS spacetime and derive the scalar two-point function of the conformal fields in those spacetime. In curved spacetime, the two-point function depends on the vacuum state of the CFT. A method to specify the vacuum state in AdS/CFT calculations is shown. Because the classical action in AdS spacetime diverges near the boundary, we need the counter terms to regulate the result. The simple derivation of the counter terms using the Hamilton-Jacobi equation is also presented in the appendix.

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  1. Brane Cosmology from AdS/BCFT

    hep-th 2025-01 conditional novelty 6.0 of 10

    In an AdS/BCFT model with a brane-localized scalar, the authors derive a real-conformal-dimension constraint for dS/CFT, a time-like g-theorem, and a classification of constant-potential brane cosmologies including bi...

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