The Microwave Background Bispectrum, Paper II: A Probe of the Low Redshift Universe

Abstract

Gravitational fluctuations along the line-of-sight from the surface of last scatter to the observer distort the microwave background in several related ways: The fluctuations deflect the photon path (gravitational lensing), the decay of the gravitational potential produces additional fluctuations (ISW effect) and scattering off of hot gas in clusters produce additional fluctuations (Sunyaev-Zel'dovich effect). Even if the initial fluctuations generated at the surface of last scatter were Gaussian, the combination of these effects produce non-Gaussian features in the microwave sky. We discuss the microwave bispectrum as a tool for measuring a studying this signal. For MAP, we estimate that these measurements will enable us to determine the fraction of ionized gas and to probe the time evolution of the gravitational potential.

15 Pages, 5 Postscript Figures; Minor Changes in Response to Referee's report

References in corpus (4)

• The Cosmic Baryon Budget
• The Microwave Background Bispectrum, Paper I: Basic Formalism
• Correlations Between the Cosmic X-ray and Microwave Backgrounds: Constraints on a Cosmological Constant
• Cross-Correlating Cosmic Microwave Background Radiation Fluctuations with Redshift Surveys: Detecting the Signature of Gravitational Lensing

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