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Parity-violation in bouncing cosmology

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arxiv 2301.13502 v2 pith:V5ZIBGUM submitted 2023-01-31 gr-qc astro-ph.COhep-phhep-th

classification gr-qcastro-ph.COhep-phhep-th
keywords bouncingparity-violationphasecosmologycontributionscalesignalscomes
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We investigate the possibility of the enhancement of parity-violation signal in bouncing cosmology. Specifically, we are interested in deciding which phase should generate the most significant parity-violation signals. We find that the dominant contribution comes from the bouncing phase, while the contraction phase has a smaller contribution. Therefore, bouncing cosmology can enhance the parity-violation signals during the bouncing phase. Moreover, since the bouncing phase has the highest energy scale in bouncing cosmology, we can also probe new physics at this scale by studying the parity-violation effect.

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Cited by 2 Pith papers

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  1. Correlated parity violation in gravity and electromagnetism from five-dimensional spacetime

    gr-qc 2026-08 conditional novelty 7.0 of 10

    A five-dimensional teleparallel Kaluza-Klein action produces a single parameter-free prediction: the electromagnetic helicity dispersion shift is exactly six times the gravitational one.

  2. 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 ...

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