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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Testing the cosmic conservation of photon number with type Ia supernovae and ages of old objects

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Jesus, J. F. [1, 2] ; Holanda, R. F. L. [3, 4, 5] ; Dantas, M. A. [6]
Total Authors: 3
[1] Univ Estadual Paulista, UNESP, Campus Expt Itapeva, BR-18409010 Itapeva, SP - Brazil
[2] Univ Estadual Paulista, UNESP, Fac Engn, BR-12516410 Guaratingueta, SP - Brazil
[3] Univ Fed Sergipe, Dept Fis, BR-49100000 Sao Cristovao, SE - Brazil
[4] Univ Fed Campina Grande, Dept Fis, BR-58429900 Campina Grande, PB - Brazil
[5] Univ Fed Rio Grande do Norte, Dept Fis, BR-59300000 Natal, RN - Brazil
[6] Univ Estado Rio Grande do Norte, Dept Fis, BR-59625620 Mossoro, RN - Brazil
Total Affiliations: 6
Document type: Journal article
Web of Science Citations: 5

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 e = 0 the conservation of photon number is recovered). We find epsilon = 0.016(-0.075)(+0.078) from the first parametrization and epsilon = -0.18(-0.24)(+0.25) 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 +/- 0.29 Gyr and t(inc) = 1.23 +/- 0.27 Gyr at 68% c.l. for each parametrization, respectively. (AU)

FAPESP's process: 13/26258-4 - Superdense matter in the universe
Grantee:Manuel Máximo Bastos Malheiro de Oliveira
Support type: Research Projects - Thematic Grants
FAPESP's process: 17/05859-0 - The accelerating universe: nature and tests of dark energy and dark matter
Grantee:José Fernando de Jesus
Support type: Regular Research Grants