DeltaT/T limits from the UCSB South Pole degree-scale experiment and constraints on the large-scale deviations from the Hubble flow

Abstract

view Abstract Citations (22) References (20) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Delta T/T Limits from the UCSB South Pole Degree-Scale Experiment and Constraints on the Large-Scale Deviations from the Hubble Flow Gorski, Krzysztof M. Abstract The limits to the cosmic microwave background radiation (CBR) temperature anisotropy derived from the results of the University of California at Santa Barbara South Pole degree-scale experiment are translated into upper bounds on large-scale deviations from the Hubble flow. Calculations involve the Einstein-de Sitter, dark matter-dominated cosmology with standard thermal history (no early reheating) and . gravitationally formed large-scale structure, seeded by random, Gaussian distributed, adiabatic inhomogeneities. The results are independent of the Hubble constant, the composition of dark matter, and the power spectrum of primordial perturbations. The lack of measurable CBR anisotropy in this experiment implies very low upper bounds upon the rms amplitude V(R) of the streaming motion within a Gaussian window of radius R: V_max_(R > 4000 km s^-1^) < 200 km s^-1^, and V_max_(R > 7500 km s^- 1^) < 100 km s^-1^. Thus, the smoothness of the CBR at a θ ~1^deg^-2^deg^ and the apparent large-amplitude (~500 km s^-1^) deviations from pure Hubble flow at R >= 4000 km s^-1^ cannot be simultaneously explained in the framework of usual large-scale structure formation models based on the assumptions involved in this calculation. Publication: The Astrophysical Journal Pub Date: October 1992 DOI: 10.1086/186563 Bibcode: 1992ApJ...398L...5G Keywords: Anisotropy; Cosmology; Hubble Constant; Relic Radiation; Astronomical Maps; Astronomical Models; Astronomical Observatories; Computational Astrophysics; Red Shift; Astrophysics; COSMOLOGY: COSMIC MICROWAVE BACKGROUND full text sources ADS |