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Evolution of light domain walls interacting with dark matter, part 1The 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 (exp -2)(1+z)(exp -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(exp -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.
Document ID
19900014895
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Massarotti, Alessandro (Chicago Univ. Chicago, IL, United States)
Date Acquired
September 6, 2013
Publication Date
April 1, 1990
Subject Category
Astrophysics
Report/Patent Number
NASA-CR-181123
NAS 1.26:181123
FERMILAB-PUB-90/77-A
Accession Number
90N24211
Funding Number(s)
CONTRACT_GRANT: NAGW-1340
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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