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Testing the cosmic conservation of photon number with type Ia supernovae and ages of old objects
- Source :
- Scopus, Repositório Institucional da UNESP, Universidade Estadual Paulista (UNESP), instacron:UNESP
- Publication Year :
- 2017
-
Abstract
- In this paper, we obtain luminosity distances by using ages of 32 old passive galaxies distributed over the redshift interval $0.11 < z < 1.84$ and test the cosmic conservation of photon number by comparing them with 580 distance moduli of type Ia supernovae (SNe Ia) from the so-called Union 2.1 compilation. Our analyses are based on the fact that the method of obtaining ages of galaxies relies on the detailed shape of galaxy spectra but not on galaxy luminosity. Possible departures from cosmic conservation of photon number is parametrized by $\tau(z) = 2 \epsilon z$ and $\tau(z) = \epsilon z/(1+z)$ (for $\epsilon =0$ the conservation of photon number is recovered). We find $\epsilon=0.016^{+0.078}_{-0.075}$ from the first parametrization and $\epsilon=-0.18^{+0.25}_{-0.24}$ from the second parametrization, both limits at 95\% c.l. In this way, no significant departure from cosmic conservation of photon number is verified. In addition, by considering the total age as inferred from Planck (2015) analysis, we find the incubation time $t_{inc}=1.66\pm0.29$ Gyr and $t_{inc}=1.23\pm0.27$ Gyr at 68\% c.l. for each parametrization, respectively.}<br />Comment: 13 pages, GRG in Press
- Subjects :
- Cosmology and Nongalactic Astrophysics (astro-ph.CO)
Photon
Physics and Astronomy (miscellaneous)
Astrophysics::High Energy Astrophysical Phenomena
FOS: Physical sciences
Astrophysics::Cosmology and Extragalactic Astrophysics
Astrophysics
Type (model theory)
01 natural sciences
Luminosity
symbols.namesake
Type Ia Supernovae
0103 physical sciences
Planck
010303 astronomy & astrophysics
Astrophysics::Galaxy Astrophysics
Scale distance
Physics
010308 nuclear & particles physics
Galaxy ages
Redshift
Galaxy
Supernova
symbols
Cosmic opacity
Parametrization
Astrophysics - Cosmology and Nongalactic Astrophysics
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Scopus, Repositório Institucional da UNESP, Universidade Estadual Paulista (UNESP), instacron:UNESP
- Accession number :
- edsair.doi.dedup.....d5d5efb09c55c7c279dd7759db5ebef7