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

Sigurdson, Kris and Kurylov, Andriy and Kamionkowski, Marc (2003) Spatial variation of the fine-structure parameter and the cosmic microwave background. Physical Review D, 68 (10). Art. No. 103509. ISSN 0556-2821. http://resolver.caltech.edu/CaltechAUTHORS:SIGprd03

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Abstract

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 fluctuations of the fine-structure parameter induce higher-order (non-Gaussian) temperature and polarization correlations in the CMB. We calculate these effects for the general case of arbitrary correlation between temperature fluctuations and fine-structure parameter fluctuations, and show the results for a model where these two types of fluctuations are uncorrelated. The formalism we present here may also be applied to other modifications of recombination physics that do not significantly alter the evolution of the dominant density perturbations. We discuss the constraints on the effective Lagrangian for the variable fine-structure parameter necessary to realize this scenario.


Item Type:Article
Additional Information:©2003 The American Physical Society. Received 19 June 2003; published 19 November 2003. We thank A. Cooray and M. Wise for useful discussions, and A. Cooray and M. Kesden for providing the results of their weak-lensing kurtosis calculations for comparison. K.S. acknowledges the support of the Canadian NSERC. This work was supported in part by NASA NAG5-9821, DOE DE-FG03-92-ER40701 and DE-FG03-02ER41215, and NSF PHY00-71856.
Subject Keywords:radiofrequency cosmic radiation; gravitational lenses; perturbation theory; causality
Record Number:CaltechAUTHORS:SIGprd03
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:SIGprd03
Alternative URL:http://dx.doi.org/10.1103/PhysRevD.68.103509
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:5530
Collection:CaltechAUTHORS
Deposited By: Lindsay Cleary
Deposited On:24 Oct 2006
Last Modified:26 Dec 2012 09:13

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