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Friedmann equations and cosmic bounce in a modified cosmological scenario

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F23%3A10464118" target="_blank" >RIV/00216208:11320/23:10464118 - isvavai.cz</a>

  • Result on the web

    <a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=OvL0OgDqC0" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=OvL0OgDqC0</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.1016/j.physletb.2023.137827" target="_blank" >10.1016/j.physletb.2023.137827</a>

Alternative languages

  • Result language

    angličtina

  • Original language name

    Friedmann equations and cosmic bounce in a modified cosmological scenario

  • Original language description

    In this work we present a derivation of modified Raychaudhuri and Friedmann equations from a phenomenological model of quantum gravity based on the thermodynamics of spacetime. Starting from general gravitational equations of motion which encode low-energy quantum gravity effects, we found its particular solution for homogeneous and isotropic universes with standard matter content, obtaining a modified Raychaudhuri equation. Then, we imposed local energy conservation and used a perturbative treatment to derive a modified Friedmann equation. The modified evolution in the early universe we obtained suggests a replacement of the Big Bang singularity by a regular bounce. Lastly, we also briefly discuss the range of validity of the perturbative approach and its results.(c) 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons .org /licenses /by /4 .0/). Funded by SCOAP3.

  • Czech name

  • Czech description

Classification

  • Type

    J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database

  • CEP classification

  • OECD FORD branch

    10300 - Physical sciences

Result continuities

  • Project

  • Continuities

    S - Specificky vyzkum na vysokych skolach

Others

  • Publication year

    2023

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

  • ISSN

    0370-2693

  • e-ISSN

    1873-2445

  • Volume of the periodical

    839

  • Issue of the periodical within the volume

    10

  • Country of publishing house

    NL - THE KINGDOM OF THE NETHERLANDS

  • Number of pages

    7

  • Pages from-to

    137827

  • UT code for WoS article

    000954997400001

  • EID of the result in the Scopus database

    2-s2.0-85150823964