Constraints on the nature of cosmological constant - From big bang nucleosyntheis and CMB anisotropies

K. Ichiki, Masanobu Yahiro, T. Kajino, M. Orito, G. J. Mathews

研究成果: ジャーナルへの寄稿記事

抄録

Numerous recent observations strongly suggest that the expansion of the universe is now accelrating due to the effect of some unknown form of "dark energy" with negative pressure. The most physically plausible candidate for the dark energy is the quintessence scalar field, which tracks the evolution of the dominant energy component in the universe and acts like a cosmological constant only after the onset of the matter dominated epoch. A generic feature of such fields is the possibility of having a significant energy density throughout the thermal history of the universe, which can affect the cosmic expansion and physical processes in the early universe. These models can therefore be effectively constrained by using the well established theories of primordial nucleosynthesis (BBN) and the cosmic microwave background (CMB) anisotropies in comparison to the latest observations. In the present work we analyze some popular forms for the quintessence field and show that primordial 4 He and D abundances put one of the most stringent constraints on the field in the early universe while CMB anisotropies put constraints on its nature at later epochs. We find that the simplest quintessence models can be ruled out from current observations. We also deduce constraints on the epoch of matter creation at the end of quintessential inflation through the effects of gravitational waves on the CMB anisotropies.

元の言語英語
ジャーナルNuclear Physics A
723
発行部数1-2
DOI
出版物ステータス出版済み - 7 28 2003

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universe
microwaves
anisotropy
time measurement
dark energy
expansion
nuclear fusion
gravitational waves
flux density
histories
scalars
energy

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

これを引用

Constraints on the nature of cosmological constant - From big bang nucleosyntheis and CMB anisotropies. / Ichiki, K.; Yahiro, Masanobu; Kajino, T.; Orito, M.; Mathews, G. J.

:: Nuclear Physics A, 巻 723, 番号 1-2, 28.07.2003.

研究成果: ジャーナルへの寄稿記事

Ichiki, K. ; Yahiro, Masanobu ; Kajino, T. ; Orito, M. ; Mathews, G. J. / Constraints on the nature of cosmological constant - From big bang nucleosyntheis and CMB anisotropies. :: Nuclear Physics A. 2003 ; 巻 723, 番号 1-2.
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