Possible Relations of Cosmic Microwave Background with Gravity and Fine-Structure Constant

Quintessence and variation of the fine structure constant in the cosmic microwave background radiation

Cosmic microwave background with Brans-Dicke Gravity: I. Covariant Formulation

In the covariant cosmological perturbation theory, a 1+3 decomposition ensures that all variables in the frame-independent equations are covariant, gauge-invariant and have clear physical interpretations. We develop this formalism in the case of BransDicke gravity, and apply this method to the calculation of cosmic microwave background (CMB) anisotropy and large scale structures (LSS). We modif...

23 . Cosmic microwave background 1 23 . COSMIC MICROWAVE BACKGROUND

The energy content in radiation from beyond our Galaxy is dominated by the Cosmic Microwave Background (CMB), discovered in 1965 [1]. The spectrum of the CMB is well described by a blackbody function with T = 2.725 K. This spectral form is one of the main pillars of the hot Big Bang model for the early Universe. The lack of any observed deviations from a blackbody spectrum constrains physical p...

Gravitational lensing on the Cosmic Microwave Background by gravity waves

We study the effect of a stochastic background of gravitational waves on the gravitational lensing of the Cosmic Microwave Background (CMB) radiation. It has been shown that matter density inhomogeneities produce a smoothing of the acoustic peaks in the angular power spectrum of the CMB anisotropies. A gravitational wave background gives rise to an additional smoothing of the spectrum. For the ...

Spatial variation of the fine-structure parameter and the cosmic microwave background

We study the effects on cosmic microwave background ~CMB! temperature and polarization anisotropies of spatial fluctuations of the fine-structure parameter between causally disconnected regions of the Universe at the time of recombination. Analogous to weak gravitational lensing, in addition to modifying the mean power spectra and inducing a curl component (B mode! to the polarization, spatial ...