Constraints on a Vacuum Energy from Both SNIa and CMB Temperature Observations
Joint Authors
Nakamura, Riou
Ikeda, Mikio
Thushari, E. P. Berni Ann
Hashimoto, Masa-aki
Source
Issue
Vol. 2012, Issue 2012 (31 Dec. 2012), pp.1-6, 6 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2012-06-20
Country of Publication
Egypt
No. of Pages
6
Main Subjects
Abstract EN
We investigate the cosmic thermal evolution with a vacuum energy which decays into photon at the low redshift.
We assume that the vacuum energy is a function of the scale factor that increases toward the early universe.
We put on the constraints using recent observations of both type Ia supernovae (SNIa) by Union-2 compilation and the cosmic microwave background (CMB) temperature at the range of the redshift 0.01 From SNIa, we find that the effects of a decaying vacuum energy on the cosmic expansion rate should be very small but could be possible for z<1.5. On the other hand, we obtain the severe constraints for parameters from the CMB temperature observations. Although the temperature can be still lower than the case of the standard cosmological model, it should only affect the thermal evolution at the early epoch.
American Psychological Association (APA)
Nakamura, Riou& Thushari, E. P. Berni Ann& Ikeda, Mikio& Hashimoto, Masa-aki. 2012. Constraints on a Vacuum Energy from Both SNIa and CMB Temperature Observations. Advances in Astronomy،Vol. 2012, no. 2012, pp.1-6.
https://search.emarefa.net/detail/BIM-478868
Modern Language Association (MLA)
Nakamura, Riou…[et al.]. Constraints on a Vacuum Energy from Both SNIa and CMB Temperature Observations. Advances in Astronomy No. 2012 (2012), pp.1-6.
https://search.emarefa.net/detail/BIM-478868
American Medical Association (AMA)
Nakamura, Riou& Thushari, E. P. Berni Ann& Ikeda, Mikio& Hashimoto, Masa-aki. Constraints on a Vacuum Energy from Both SNIa and CMB Temperature Observations. Advances in Astronomy. 2012. Vol. 2012, no. 2012, pp.1-6.
https://search.emarefa.net/detail/BIM-478868
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-478868