Viscosity in cosmic fluids

Show simple item record Natwariya, Pravin Kumar Bhatt, Jitesh R. Pandey, Arun Kumar 2020-09-03T06:25:09Z 2020-09-03T06:25:09Z 2020-08
dc.identifier.citation Natwariya, Pravin Kumar; Bhatt, Jitesh R. and Pandey, Arun Kumar, "Viscosity in cosmic fluids", The European Physical Journal C, DOI: 10.1140/epjc/s10052-020-8341-8, vol. 80, no. 8, Aug. 2020. en_US
dc.identifier.issn 1434-6044
dc.identifier.issn 1434-6052
dc.description.abstract The effective theory of large-scale structure formation based on CDM paradigm predicts finite dissipative effects in the resulting fluid equations. In this work, we study how viscous effect that could arise if one includes self-interaction among the dark-matter particles combines with the effective theory. It is shown that these two possible sources of dissipation can operate together in a cosmic fluid and the interplay between them can play an important role in determining dynamics of the cosmic fluid. In particular, we demonstrate that the viscosity coefficient due to self-interaction is added inversely with the viscosity calculated using effective theory of CDM model. Thus the larger viscosity has less significant contribution in the effective viscosity. Using the known bounds on for self-interacting darkmatter, where and m are the cross-section and mass of the dark-matter particles respectively, we discuss role of the effective viscosity in various cosmological scenarios.
dc.description.statementofresponsibility by Pravin Kumar Natwariya, Jitesh R. Bhatt and Arun Kumar Pandey
dc.language.iso en_US en_US
dc.publisher Springer en_US
dc.title Viscosity in cosmic fluids en_US
dc.type Article en_US
dc.relation.journal The European Physical Journal C

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