Testing CCDM Cosmology with the Radiation Temperature-Redshift Relation

Abstract

The standard $\Lambda$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, ${\nu }_r$, 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 ${\nu }_r=0.024_{-0.024}^{+0.026}$ ($1\sigma$ confidence level), thereby showing that $\Lambda$CDM (${\nu }_r=0$) 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 $\Lambda$CDM and CCDM cosmologies.

20 pages, 3 figures. Statistical analysis corrected and updated. Main conclusions were not changed

References in corpus (6)

• Scalar-field-dominated cosmology with a transient accelerating phase
• Covariantizing the interaction between dark energy and dark matter
• Constraining $f(R)$ gravity by the Large Scale Structure
• Measurement of the $T_{\mathrm{CMB}}$ evolution from the Sunyaev-Zel'dovich effect
• A third alternative to explain recent observations: Future deceleration
• Degeneracy between CCDM and $\Lambda$CDM cosmologies

Cited by in corpus (3)

• Gravitationally induced particle production in scalar-tensor $f(R,T)$ gravity
• Observational constraints on the interacting dark energy - dark matter (IDM) cosmological models
• Gravitational Matter Creation, Multi-fluid Cosmology and Kinetic Theory