Is the radiation temperature-redshift relation of the standard cosmology in accordance with the data?

Lima, J. A. S.; Silva, A. I.; Viegas, S. M.

doi:10.1046/j.1365-8711.2000.03172.x

Cited by 115 publications

(145 citation statements)

References 34 publications

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“…Fitting the measurements from different techniques with the expression T CMB (z) = T 0 CMB ×(1+z) 1−β (Lima et al 2000), we get the constraints on β summarised in Table 2. We note that combining CO measurements of T CMB (z) with those obtained from other techniques improves the precision of the β-measurement by more than a factor of two.…”

Section: Resultsmentioning

confidence: 99%

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The evolution of the cosmic microwave background temperature

Noterdaeme

Petitjean

Srianand

et al. 2011

A&A

165

164

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A milestone of modern cosmology was the prediction and serendipitous discovery of the cosmic microwave background (CMB), the radiation leftover after decoupling from matter in the early evolutionary stages of the Universe. A prediction of the standard hot Big-Bang model is the linear increase with redshift of the black-body temperature of the CMB (T CMB ). This radiation excites the rotational levels of some interstellar molecules, including carbon monoxide (CO), which can serve as cosmic thermometers. Using three new and two previously reported CO absorption-line systems detected in quasar spectra during a systematic survey carried out using VLT/UVES, we constrain the evolution of T CMB to z ∼ 3. Combining our precise measurements with previous constraints, we obtain T CMB (z) = (2.725 ± 0.002) × (1 + z) 1−β K with β = −0.007 ± 0.027, a more than two-fold improvement in precision. The measurements are consistent with the standard (i.e. adiabatic, β = 0) Big-Bang model and provide a strong constraint on the effective equation of state of decaying dark energy (i.e. w eff = −0.996 ± 0.025).

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Section: Resultsmentioning

confidence: 99%

“…The dotted line represents the adiabatic evolution of T CMB as expected in standard hot Big-Bang models. The solid line with shadowed errors is the fit using all the data and the alternative scaling of T CMB (z) (Lima et al 2000) yielding β = −0.007 ± 0.027. The red dashed curve (resp.…”

Section: Resultsmentioning

confidence: 99%

The evolution of the cosmic microwave background temperature

Noterdaeme

Petitjean

Srianand

et al. 2011

A&A

165

164

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“…In addition, like the bulk viscosity, we are aware that that the creation pressure is also negative for an expanding Universe (see Eq. (25). However, we recall that unlike the energy density there is no constraint conditions to the kinetic pressure for states out of equilibrium [27].…”

Section: Adiabatic Particle Production: Kinetic Formulationmentioning

confidence: 99%

Gravitationally induced particle production: Thermodynamics and kinetic theory

2014

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A relativistic kinetic description for the irreversible thermodynamic process of gravitationally induced particle production is proposed in the context of an expanding Friedmann-Robertson-Walker (FRW) geometry. We show that the covariant thermodynamic treatment referred to as "adiabatic" particle production provoked by the cosmic time-varying gravitational field has a consistent kinetic counterpart. The variation of the distribution function is associated to a non-collisional kinetic term of quantum-gravitational origin which is proportional to the ratio Γ/H, where Γ is the gravitational particle production rate and H is the Hubble parameter. For Γ << H the process is negligible and as should be expected it also vanishes (regardless of the value of Γ) in the absence of gravitation. The resulting non-equilibrium distribution function has the same functional form of equilibrium with the evolution laws corrected by the particle production process. The macroscopic temperature evolution law is also kinetically derived for massive and massless particles. The present approach points to the possibility of an exact (semi-classical) quantum-gravitational kinetic treatment by incorporating back-reaction effects in the cosmic background.PACS numbers: 98.80.-k, 95.36.+x

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“…The Planckian form of the spectrum is preserved if photon creation is adiabatic, that is, if the entropy per photon remains constant. Lima et al [10,11] have studied this in the context of decaying vacuum cosmologies; here we review some of their formalism.…”

Section: Adiabatic Photon Injectionmentioning

confidence: 99%

Constraints on the CMB temperature-redshift dependence from SZ and distance measurements

Avgoustidis

Luzzi

Martins

et al. 2012

J. Cosmol. Astropart. Phys.

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Abstract. The relation between redshift and the CMB temperature, T CMB (z) = T 0 (1 + z) is a key prediction of standard cosmology, but is violated in many nonstandard models. Constraining possible deviations to this law is an effective way to test the ΛCDM paradigm and search for hints of new physics. We present state-ofthe-art constraints, using both direct and indirect measurements. In particular, we point out that in models where photons can be created or destroyed, not only does the temperature-redshift relation change, but so does the distance duality relation, and these departures from the standard behaviour are related, providing us with an opportunity to improve constraints. We show that current datasets limit possible deviations of the form T CMB (z) = T 0 (1 + z) 1−β to be β = 0.004 ± 0.016 up to a redshift z ∼ 3. We also discuss how, with the next generation of space and ground-based experiments, these constraints can be improved by more than one order of magnitude.

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Is the radiation temperature-redshift relation of the standard cosmology in accordance with the data?

Cited by 115 publications

References 34 publications

The evolution of the cosmic microwave background temperature

The evolution of the cosmic microwave background temperature

Gravitationally induced particle production: Thermodynamics and kinetic theory

Constraints on the CMB temperature-redshift dependence from SZ and distance measurements

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