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Stable, non-singular bouncing universe with only a scalar mode

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arxiv 2005.01762 v1 pith:DEV4UAAU submitted 2020-05-04 gr-qc astro-ph.COhep-th

K. Sravan Kumar , Shubham Maheshwari , Anupam Mazumdar , Jun Peng This is my paper · ORCID
classification gr-qcastro-ph.COhep-th
keywords scalarbouncingnon-singularonlyabsenceacrossadmitsbounce
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In this paper, we study a class of higher derivative, non-local gravity which admits homogeneous and isotropic non-singular, bouncing universes in the absence of matter. At the linearized level, the theory propagates only a scalar degree of freedom, and no vector or tensor modes. The scalar can be made free from perturbative ghost instabilities, and has oscillatory and bounded evolution across the bounce.

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  1. Is there ghost and tachyon free bounce in UV complete gravity theory?

    gr-qc 2026-07 conditional novelty 6.0 of 10

    Ghost- and tachyon-free bounces in AID gravity require a negative cosmological constant; known positive-Λ solutions inevitably contain ghost radiation.

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