English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Use formulas to describe the monopole and dipole spectra of the CosmicMicrowave Background (CMB) radiation, the exact expressions for the temperaturedependences of the radiative and thermodynamic functions, such as the totalradiation power per unit area, total energy density, number density of photons,Helmholtz free energy density, entropy density, heat capacity at constantvolume, pressure, enthalpy density, and internal energy density in the finiterange of frequencies are obtained. Since the dependence of temperature upon theredshift z is known, the obtained expressions can be simply presented in zrepresentation. Utilizing experimental data for the monopole and dipole spectrameasured by the COBE FIRAS instrument in the 60 - 600 GHz frequency interval atthe temperature T = 2.728 K, the values of the radiative and thermodynamicfunctions, as well as the radiation density constant a and the Stefan-Boltzmannconstant are calculated. In the case of the dipole spectrum, the constants aand the Stefan-Boltzmann constant, and the radiative and thermodynamicproperties of the CMB radiation are obtained using the mean amplitude Tamp =3.369 m K. It is shown that the Doppler shift leads to a renormalization of theradiation density constant a, the Stefan-Boltzmann constant, and thecorresponding constants for the thermodynamic functions. The radiative andthermodynamic properties of the Cosmic Microwave Background radiation for themonopole and dipole spectra at the redshift z = 1089 are calculated.

On the radiative and thermodynamic properties of the Cosmic Microwave Background radiation using COBE FIRAS instrument data