Reionization and cosmic microwave background distortions: A complete treatment of second-order Compton scattering

1994 ◽  
Vol 49 (2) ◽  
pp. 648-670 ◽  
Author(s):  
Wayne Hu ◽  
Douglas Scott ◽  
Joseph Silk
Keyword(s):  
Cosmic Microwave Background ◽  
Compton Scattering ◽  
Second Order ◽  
Microwave Background ◽  
Complete Treatment

scholarly journals Non-Gaussianity and the Cosmic Microwave Background Anisotropies

2010 ◽  
Vol 2010 ◽  
pp. 1-68 ◽  
Author(s):  
N. Bartolo ◽  
S. Matarrese ◽  
A. Riotto
Keyword(s):  
Cosmic Microwave Background ◽  
Initial Conditions ◽  
Second Order ◽  
Basic Knowledge ◽  
Secondary Effects ◽  
Microwave Background ◽  
Numerical Examples ◽  
Many Sources ◽  
The Impact ◽  
Recombination Epoch

We review in a pedagogical way the present status of the impact of non-Gaussianity (NG) on the cosmic microwave background (CMB) anisotropies. We first show how to set the initial conditions at second order for the CMB anisotropies when some primordial NG is present. However, there are many sources of NG in CMB anisotropies, beyond the primordial one, which can contaminate the primordial signal. We mainly focus on the NG generated from the post inflationary evolution of the CMB anisotropies at second order in perturbation theory at large and small angular scales, such as the ones generated at the recombination epoch. We show how to derive the equations to study the second-order CMB anisotropies and provide analytical computations to evaluate their contamination to primordial NG (complemented with numerical examples). We also offer a brief summary of other secondary effects. This paper requires basic knowledge of the theory of cosmological perturbations at the linear level.

scholarly journals THE YUAN TSEH LEE AMiBA PROJECT

2008 ◽  
Vol 23 (17n20) ◽  
pp. 1243-1251 ◽  
Author(s):  
PAUL T. P. HO ◽  
PABLO ALTIMIRANO ◽  
MARK BIRKINSHAW ◽  
SU-WEI CHANG ◽  
CHA-HAO CHANG ◽  
...  
Keyword(s):  
Cosmic Microwave Background ◽  
Compton Scattering ◽  
Background Radiation ◽  
Clusters Of Galaxies ◽  
Microwave Background ◽  
Inverse Compton Scattering ◽  
Mauna Loa ◽  
Inverse Compton ◽  
Microwave Background Radiation ◽  
Sunyaev Zel'dovich Effect

The Array for Microwave Background Anisotropy is a 7-element interferometer sited on Mauna Loa, Hawaii. The seven 60cm telescopes are mounted on a 6-meter platform, and operates at 3mm wavelength. In October 2006, the telescope was officially dedicated and renamed as the Y. T. Lee AMiBA. During 2007, scientific operations have begun, after a long process of calibration and testing. At the time of this meeting, six clusters of galaxies have been detected and mapped via the inverse Compton scattering of the Cosmic Microwave Background radiation, also known as the Sunyaev-Zel'dovich Effect.

Generation of circular polarization of CMB from the Euler–Heisenberg Lagrangian

2018 ◽  
Vol 96 (8) ◽  
pp. 859-863
Author(s):  
Iman Motie
Keyword(s):  
Lower Bound ◽  
Cosmic Microwave Background ◽  
Circular Polarization ◽  
Compton Scattering ◽  
Time Evolution ◽  
Stokes Parameter ◽  
Microwave Background ◽  
Boltzman Equation ◽  
Effective Lagrangian ◽  
Linearly Polarized

It is known that the dominated contribution of primordial anisotropies of cosmic microwave background (CMB) are linearly polarized via Compton scattering. However, circular polarization of this anisotropy has not been observed up to now, but it has not been excluded in observational evidences. Here we show that the Euler–Heisenberg effective Lagrangian can generate circular polarization in CMB. This generation is calculated by using the quantum Boltzman equation for time evolution of the Stokes parameter. Also we estimate Faraday conversion phase on the order of 10−13 due to this Lagrangian, which gives a lower bound on circular polarization of CMB.

Polarization Signatures of Clusters in the Microwave Background

2005 ◽  
Vol 201 ◽  
pp. 445-446
Author(s):  
Anthony. Challinor
Keyword(s):  
Cosmic Microwave Background ◽  
Relativistic Electron ◽  
Compton Scattering ◽  
Galaxy Clusters ◽  
Frequency Spectrum ◽  
Velocity Dispersion ◽  
Electron Velocity ◽  
Line Of Sight ◽  
Microwave Background

Compton scattering of photons from ionised gas in galaxy clusters along the line of sight leaves an imprint in the polarization of the cosmic microwave background. We investigate this process taking account of the effects of relativistic electron velocity dispersion and primordial anisotropy on the frequency spectrum of the generated polarization. We also discuss the prospects of detecting such effects with the Planck survey.

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