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Cited by 3Cosmology and Gravitation TheoriesNoncommutative and Quantum Gravity TheoriesBlack Holes and Theoretical Physics

Tunneling-induced cosmic bounce in the presence of anisotropies

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Alexandre, Jean, Clough, Katy, Pla, Silvia·2023·Physical Review D
DOI 10.1103/physrevd.108.103515
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Abstract

If we imagine rewinding the universe to early times, the scale factor shrinks and the existence of a finite spatial volume may play a role in quantum tunneling effects in a closed universe. It has recently been shown that such finite volume effects dynamically generate an effective equation of state that could support a cosmological bounce. In this work we extend the analysis to the case in which a (homogeneous) anisotropy is present, and identify a criteria for a successful bounce in terms of the size of the closed universe and the properties of the quantum field.

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  • In the simplified model analysed in Refs. [21, 22], where E_cas^(3)=0 and E_inst=E_inst^(hom), it was found L_bounce ≃ 10^-5 metres for U0=κ^-1Λ=10^-122 l_p^-4, m=10^-3 eV and λ∼1.

    “For example, in the simplified model analysed in Refs. [21, 22], where E (3) cas = 0 and E inst = E (hom) inst with E (hom) inst given in Eq. (4.31), it was found L bounce ≃ 10 -5 metres for U 0 = κ -1 Λ = 10 -122 ℓ -4 p , m = 10 -3 eV and λ ∼ 1.”

    From Double-well instantons in finite volume (2024) · cites this paper as [22]

    Section C, “Size of the Universe at the bounce” (page unavailable), relates bounce size to field parameters and assumes a self-coupling of order one. But its numerical example is a bounce at about 1 metre with a mass of about 10^-7 eV and Λ of about 10^-140 ℓp^-2; it does not report the claimed 10^-5-metre result for the specified parameters. The Discussion distinguishes tunnelling from the Casimir effect, but does not state the cited sentence’s exact energy-term assumptions. (LLM, conf=0.84)

    Experimental — accuracy not yet measured

  • The violation of the NEC could induce a cosmic bounce.

    “The violation of the NEC could induce a cosmic bounce [22].”

    From Double-well instantons in finite volume (2024) · cites this paper as [22]

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Cited by

Sorted by citations

Authors
Alexandre, J., Clough, K., & Pla, S.
Affiliations
  • King's College London (GB)
  • Queen Mary University of London (GB)
ORCID
Venue
Physical Review D
Publisher
American Physical Society (APS)
Published
2023-11-14
Volume
108
Issue
10
ISSN
  • 2470-0010 (ISSN-L)
  • 2470-0029
DOI
10.1103/physrevd.108.103515
OpenAlex
W4388672544
Cited by
3
References
3
Citations by year
2025: 1 · 2024: 2
FWCI
0.35
Type
journal article
Language
en
Open access
Licence
Locations
  • Physical review. D/Physical review. D. (publishedVersion)
  • arXiv (Cornell University) (submittedVersion, cc-by)
  • Research Portal (King's College London) (submittedVersion, cc-by)
  • Queen Mary Research Online (Queen Mary University of London) (submittedVersion, cc-by)
  • arXiv (Cornell University) (cc-by)
Funders
  • Leverhulme Trust (RPG-2021-299)
  • Science and Technology Facilities Council (STFC-ST/T000759/1, ST/V003240/1)
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Cosmology and Gravitation Theories
  • Physical Sciences › Physics and Astronomy › Statistical and Nonlinear Physics › Noncommutative and Quantum Gravity Theories
  • Physical Sciences › Physics and Astronomy › Nuclear and High Energy Physics › Black Holes and Theoretical Physics
Keywords
bounce cosmology, quantum tunneling, anisotropic cosmology, closed universe, finite volume effects, effective equation of state, quantum field theory in curved spacetime

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