Effects on the temperatures of a variable cosmological term after recombination

K. Kimura, M. Hashimoto, K. Sakoda, K. Arai

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


The thermal evolution of the universe with a variable cosmological term λ = λ10 + λ20a-m is investigated, where a is the scale factor. Energy densities of the radiation and matter are included to examine numerically the thermal evolution from the primordial nucleosynthesis to the matter-dominant era. It is found that the radiation temperature predicted from the variable λ models is lowered significantly compared with the constant λ model if λ20 ≳ 0.0002 and z ≲ 104, which implies that the matter temperature decreases drastically. We stress that the strong decreases in both the radiation temperature and matter temperature affect the formation of the first objects at 10 ≲ z ≲ 1000.

Original languageEnglish
Pages (from-to)L19-L22
JournalAstrophysical Journal
Issue number1 PART 2
Publication statusPublished - Nov 1 2001

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


Dive into the research topics of 'Effects on the temperatures of a variable cosmological term after recombination'. Together they form a unique fingerprint.

Cite this