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DHOST Bounce

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arxiv 2002.08269 v2 pith:HUB3D5MF submitted 2020-02-19 gr-qc astro-ph.COhep-phhep-th

Amara Ilyas , Mian Zhu , Yunlong Zheng , Yi-Fu Cai , Emmanuel N. Saridakis This is my paper · ORCID
classification gr-qcastro-ph.COhep-phhep-th
keywords bouncedhostnonsingulartheoriescosmologyframeworkfreegalileon
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We present a new class of nonsingular bounce cosmology free from instabilities, using a single scalar field coupled to gravity within the framework of the Degenerate Higher-Order Scalar-Tensor (DHOST) theories. In this type of scenarios, the gradient instability that widely exists in nonsingular bounce cosmologies in the framework of scalar-tensor and Horndeski/Galileon theories is removed by the effects of new operators introduced by the DHOST, due to the modification that they later bring about to the dispersion relation of perturbations. Hence, our results demonstrate that there is indeed a loophole for this type of bounce scenarios to be free from pathologies when primordial perturbations evolve through the bounce phase, and thus the theoretical {\it no-go} theorem for nonsingular bounce cosmology of Horndeski/Galileon theories can be delicately evaded in DHOST extensions.

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Cited by 4 Pith papers

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

  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.

  2. Primordial black hole dark matter from ultra-slow-roll inflation in Horndeski gravity

    gr-qc 2025-12 conditional novelty 5.0 of 10

    A kinetic cubic Horndeski coupling creates an ultra-slow-roll phase that amplifies curvature perturbations enough to produce asteroid-mass primordial black holes, potentially 90% of dark matter.

  3. Gravitational Waves from Primordial Black Holes formed by Null Energy Condition Violation during Inflation

    gr-qc 2026-02 conditional novelty 4.0 of 10

    A transient null-energy-condition violation during inflation is shown to produce a four-component gravitational-wave background — primordial, scalar-induced, PBH ringdown, and binary-merger — with only the solar-mass ...

  4. Non-singular bounce solutions in Myrzakulov $f(R,T)$ gravity

    gr-qc 2025-01 reject novelty 4.0 of 10

    In Myrzakulov F(R,T) gravity, free connection functions can be chosen to produce matter-bounce backgrounds with a scale-invariant scalar power spectrum.

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