Non-Gaussian microwave background fluctuations from nonlinear gravitational effects

Details Non-Gaussian microwave background fluctuations from nonlinear gravitational effects Non-Gaussian microwave background fluctuations from nonlinear gravitational effects

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991stin...9131067s&link_type=abstract

Presented at the 4th Canadian Conference on General Relativity and Relativistic Astrophysics, Winnipeg, Manitoba, 16-18 May 1991

Astronomy and Astrophysics

Astrophysics

Anisotropy, Background Radiation, Gravitation Theory, Microwaves, Nonlinearity, Quantum Theory, Statistical Analysis, Temperature Effects, Astronomical Models, Cosmic Background Explorer Satellite, Gravitational Effects, Mathematical Models, Potential Fields, Random Processes, Relief Maps, Scalars, Temperature Distribution

Scientific paper

Whether the statistics of primordial fluctuations for structure formation are Gaussian or otherwise may be determined if the Cosmic Background Explorer (COBE) Satellite makes a detection of the cosmic microwave-background temperature anisotropy delta TCMB/TCMB. Non-Gaussian fluctuations may be generated in the chaotic inflationary model if two scalar fields interact nonlinearly with gravity. Theoretical contour maps are calculated for the resulting Sachs-Wolfe temperature fluctuations at large angular scales (greater than 3 degrees). In the long-wavelength approximation, one can confidently determine the nonlinear evolution of quantum noise with gravity during the inflationary epoch because: (1) different spatial points are no longer in causal contact; and (2) quantum gravity corrections are typically small-- it is sufficient to model the system using classical random fields. If the potential for two scalar fields V(phi1, phi2) possesses a sharp feature, then non-Gaussian fluctuations may arise. An explicit model is given where cold spots in delta TCMB/TCMB maps are suppressed as compared to the Gaussian case. The fluctuations are essentially scale-invariant.

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