Ackerman, Lotty and Carroll, Sean M. and Wise, Mark B. (2007) Imprints of a primordial preferred direction on the microwave background. Physical Review D, 75 (8). Art. No. 083502. ISSN 0556-2821 http://resolver.caltech.edu/CaltechAUTHORS:ACKprd07
See Usage Policy.
Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:ACKprd07
Rotational invariance is a well-established feature of low-energy physics. Violations of this symmetry must be extremely small today, but could have been larger in earlier epochs. In this paper we examine the consequences of a small breaking of rotational invariance during the inflationary era when the primordial density fluctuations were generated. Assuming that a fixed-norm vector picked out a preferred-direction during the inflationary era, we explore the imprint it would leave on the cosmic microwave background anisotropy, and provide explicit formulas for the expected amplitudes <almal[sup [prime]]m[sup [prime]]*> of the spherical-harmonic coefficients. We suggest that it is natural to expect that the imprint on the primordial power spectrum of a preferred spatial direction is approximately scale-invariant, and examine a simple model in which this is true.
|Additional Information:||©2007 The American Physical Society (Received 29 January 2007; published 5 April 2007) Dragan Huterer near its completion. This research was supported in part by the U.S. Department of Energy and by the David and Lucile Packard Foundation.|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Archive Administrator|
|Deposited On:||20 Aug 2007|
|Last Modified:||26 Dec 2012 09:40|
Repository Staff Only: item control page