Environmental cosmic acceleration from a phase transition in the dark sector
Abstract A new degravitation mechanism within the framework of scalar tensor gravity is postulated and included by prescription. The mechanism eliminates all constant contributions from the potential to the Friedmann equation, leaving only the kinematic and the dynamic terms of the potential to drive cosmic acceleration. We explore a scenario involving a density-triggered phase transition in the late-time universe, and argue that the resulting effective energy density and equation of state parameter can explain late-time cosmology when extrapolated to a region of the parameter space.
Authors
- Øyvind Christiansen (ORCID: https://orcid.org/0000-0003-1658-5114)
- Farbod Hassani (ORCID: https://orcid.org/0000-0003-2640-4460)
- David F. Mota (ORCID: https://orcid.org/0000-0003-3141-142X)
Institutions
- University of Oslo (NO)
- Czech Academy of Sciences (CZ)
- Institute of Physics of the Slovak Academy of Sciences (SK)
Publication Details
- Journal
- Journal of Cosmology and Astroparticle Physics
- Published
- 2025-01-01
- DOI
- https://doi.org/10.1088/1475-7516/2025/01/043
- Citations
- 2
- Primary Topic
- Cosmology and Gravitation Theories
- Type
- article
- Field-Weighted Citation Impact
- 2.31
Funders
- European Commission
- Norges Forskningsråd
- Forskningsrådet om Hälsa, Arbetsliv och Välfärd
- Centro Svizzero di Calcolo Scientifico
- National Supercomputing Centre Singapore