International Journal of Theoretical Physics

, Volume 57, Issue 5, pp 1417–1424 | Cite as

Ideal Gas with a Varying (Negative Absolute) Temperature: an Alternative to Dark Energy?

  • Subhajit Saha
  • Anindita Mondal
  • Christian Corda


The present work is an attempt to investigate whether the evolutionary history of the Universe from the offset of inflation can be described by assuming the cosmic fluid to be an ideal gas with a specific gas constant but a varying negative absolute temperature (NAT). The motivation of this work is to search for an alternative to the “exotic” and “supernatural” dark energy (DE). In fact, the NAT works as an “effective quintessence” and there is need to deal neither with exotic matter like DE nor with modified gravity theories. For the sake of completeness, we release some clarifications on NATs in Section 3 of the paper.


Negative absolute temperature Cosmic acceleration Ideal gas law Dark energy 



Subhajit Saha was partially supported by SERB, Govt. of India under National Post-doctoral Fellowship Scheme [File No. PDF/2015/000906]. Anindita Mondal is thankful to DST, Govt. of India for providing Senior Research Fellowship. Christian Corda is supported financially by the Research Institute for Astronomy and Astrophysics of Maragha (RIAAM), Project No. 1/4717-16.

The authors thank two unknown Reviewers for useful comments and advices.


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Authors and Affiliations

  1. 1.Department of MathematicsPanihati MahavidyalayaKolkataIndia
  2. 2.Department of Astrophysics and CosmologyS. N. Bose National Center for Basic SciencesSalt Lake CityIndia
  3. 3.Research Institute for Astronomy and Astrophysics of Maragha (RIAAM)MaraghaIran

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