Striking nonlinear mode coupling in the CMBR

Details Striking nonlinear mode coupling in the CMBR Striking nonlinear mode coupling in the CMBR

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998tx19.confe.579s&link_type=abstract

Abstracts of the 19th Texas Symposium on Relativistic Astrophysics and Cosmology, held in Paris, France, Dec. 14-18, 1998. Eds.:

Astronomy and Astrophysics

Astrophysics

Scientific paper

Fluctuations in the early universe are routinely treated within the linear approximation. We examine this linear hypothesis and its validity by adding the force that large wavelength perturbations exert on short wavelength waves during the time of recombination. We find that the large scale shears between the matter and radiation make the very short isothermal waves unstable. Moreover, the amplitude of the large scale fluctuations expected from typical cosmological models is on the limit between having a negligible effect and having nonlinear small scale structure form at recombination. Under certain circumstances, it can even affect the large, horizon size scales as well.

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