Testing creation cold dark matter cosmology with the radiation temperature-redshift relation

Author(s)

Baranov, Iuri P. R. ^{[1, 2, 3]} ; Jesus, Jose F. ^{[4, 5]} ; Lima, Jose A. S. ^[1]

Affiliation

^[1] Univ Sao Paulo, Dept Astron, R Matao 1226, BR-05508900 Sao Paulo, SP - Brazil

^[2] Inst Fed Parana, R Felipe Tequinha 1400, BR-87703536 Paranavai, PR - Brazil

^[3] Inst Fed Educ Ciencia & Tecnol Bahia, Campus Simoes Filho, Via Univ S-N, BR-43700000 Simoes Filho, BA - Brazil

^[4] Univ Estadual Paulista Unesp, Campus Expt Itapeva, R Geraldo Alckmin 519, BR-18409010 Itapeva, SP - Brazil

^[5] Univ Estadual Paulista Unesp, Fac Engn Guaratingueta, Av Ariberto Pereira da Cunha 333, BR-12516410 Guaratingueta, SP - Brazil

• Document type: Journal article
• Source: GENERAL RELATIVITY AND GRAVITATION; v. 51, n. 2 FEB 2019.
• Web of Science Citations: 0

Abstract

The standard CDM model can be mimicked at the background and perturbative levels (linear and non-linear) by a class of gravitationally induced particle production cosmology dubbed CCDM cosmology. However, the radiation component in the CCDM model follows a slightly different temperature-redshift T(z)-law which depends on an extra parameter, r, describing the subdominant photon production rate. Here we perform a statistical analysis based on a compilation of 36 recent measurements of T(z) at low and intermediate redshifts. The likelihood of the production rate in CCDM cosmologies is constrained by r=0.024-0.024+0.026(1 sigma confidence level), thereby showing that CDM (r=0) is still compatible with the adopted data sample. Although being hardly differentiated in the dynamic sector (cosmic history and matter fluctuations), the so-called thermal sector (temperature law, abundances of thermal relics and CMB power spectrum) offers a clear possibility for crucial tests confronting CDM and CCDM cosmologies. (AU)

• FAPESP's process: 17/05859-0 - The accelerating universe: nature and tests of dark energy and dark matter
• Grantee: José Fernando de Jesus
• Support Opportunities: Regular Research Grants