1604.05099.pdf (734.96 kB)
Cosmology with negative absolute temperatures
journal contribution
posted on 2023-06-09, 02:48 authored by J P P Vieira, Christian ByrnesChristian Byrnes, Antony LewisAntony LewisNegative absolute temperatures (NAT) are an exotic thermodynamical consequence of quantum physics which has been known since the 1950’s (having been achieved in the lab on a number of occasions). Recently, the work of Braun et al [1] has rekindled interest in negative temperatures and hinted at a possibility of using NAT systems in the lab as dark energy analogues. This paper goes one step further, looking into the cosmological consequences of the existence of a NAT component in the Universe. NAT-dominated expanding Universes experience a borderline phantom expansion (w < -1) with no Big Rip, and their contracting counterparts are forced to bounce after the energy density becomes sufficiently large. Both scenarios might be used to solve horizon and flatness problems analogously to standard inflation and bouncing cosmologies. We discuss the difficulties in obtaining and ending a NAT-dominated epoch, and possible ways of obtaining density perturbations with an acceptable spectrum.
History
Publication status
- Published
File Version
- Accepted version
Journal
Journal of Cosmology and Astroparticle PhysicsISSN
1475-7516Publisher
IOP PublishingExternal DOI
Issue
08Volume
1608Page range
060Department affiliated with
- Physics and Astronomy Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2016-09-12First Open Access (FOA) Date
2017-08-26First Compliant Deposit (FCD) Date
2016-09-12Usage metrics
Categories
No categories selectedKeywords
Licence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC