Evolution of light domain walls interacting with dark matter, part 1

Details Evolution of light domain walls interacting with dark matter, part 1 Evolution of light domain walls interacting with dark matter, part 1

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990stin...9024211m&link_type=abstract

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Mathematics

Logic

Cosmology, Dark Matter, Domain Wall, Microwaves, Reflectance, Universe, Background Radiation, Distortion, Friction, Horizon, Phase Transformations

Scientific paper

The evolution of domain walls generated in the early Universe is discussed considering an interaction between the walls and a major gaseous component of the dark matter. The walls are supposed able to reflect the particles elastically and with a reflection coefficient of unity. A toy Lagrangian that could give rise to such a phenomenon is discussed. In the simple model studied, highly non-relativistic and slowly varying speeds are obtained for the domain walls (approximately 10 -2(1+z)-1) and negligible distortions of the microwave background. In addition, these topological defects may provide a mechanism of forming the large scale structure of the Universe, by creating fluctuations in the dark matter (delta rho/rho approximately O(1)) on a scale comparable with the distance the walls move from the formation (in the model d less than 20 h-1 Mpc). The characteristic scale of the wall separation can be easily chosen to be of the order of 100 Mpc instead of being restricted to the horizon scale, as usually obtained.

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