1997/06/30 by Neil Turok, Ue-Li Pen, Ue‐Li Pen +2 · 60 citations
Mathematics · Physics and Astronomy · #Anisotropy #Cauchy stress tensor #Classical mechanics #Cosmic microwave background #Cosmology and Gravitation Theories #Exact solutions in general relativity #Geometry #Ionosphere and magnetosphere dynamics #Isotropy #Mathematics #Physics #Quantum mechanics #Radio Astronomy Observations and Technology #Scalar (mathematics) #Scaling #Statistical physics #Tensor (intrinsic definition) #Tensor field #Theoretical physics #astro-ph
paper · pdf · doi:10.1103/physrevd.58.023506
published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 58(2) (American Physical Society) · 13 pages, compressed and uuencoded RevTex file and postscript figures. Minor typographical changes
arxiv created 1997/07/01 · openalex publication_date 1998/06/24 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Recent work has emphasised the importance of vector and tensor contributions to the large scale microwave anisotropy fluctuations produced by cosmic defects. In this paper we provide a general discussion of these contributions, and how their magnitude is constrained by the fundamental assumptions of causality, scaling, and statistical isotropy. We discuss an analytic model which illustrates and explains how the ratios of isotropic and anisotropic scalar, vector and tensor stress-energy sources are determined. This provides a check of the results from large scale numerical simulations, confirming the numerical finding that vector and tensor modes provide substantial contributions to the large angle anisotropies. We show that the qualitative features of the stress-energy tensor carry over to the microwave background anisotropies. This leads to a suppression of the scalar normalization and consequently of the Doppler peaks.