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- W3007874776 abstract "Abstract We calculate the shear ( $$eta $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mi>η</mml:mi> </mml:math> ) and bulk viscosity ( $$zeta $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mi>ζ</mml:mi> </mml:math> ) of Self Interacting Dark Matter (SIDM) fluid using the kinetic theory formalism. Using the astrophysical constraints on dark matter self-interaction cross section over mass $$ sigma /m $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mi>σ</mml:mi> <mml:mo>/</mml:mo> <mml:mi>m</mml:mi> </mml:mrow> </mml:math> , we demonstrate that viscous SIDM fluid violates the lower bound on the ratio of shear viscosity to its entropy density, $$eta /mathfrak {s}=frac{1}{4pi }$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mi>η</mml:mi> <mml:mo>/</mml:mo> <mml:mi>s</mml:mi> <mml:mo>=</mml:mo> <mml:mfrac> <mml:mn>1</mml:mn> <mml:mrow> <mml:mn>4</mml:mn> <mml:mi>π</mml:mi> </mml:mrow> </mml:mfrac> </mml:mrow> </mml:math> . Then, considering the $$eta /mathfrak {s}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mi>η</mml:mi> <mml:mo>/</mml:mo> <mml:mi>s</mml:mi> </mml:mrow> </mml:math> bound as universal, we derive a theoretical upper limit on the ratio of velocity average dark matter self interaction cross-section to its mass and also estimate an upper limit on SIDM mass. We report that mass of the SIDM particle should be sub-GeV scale. Furthermore, with the assumption of a power-law form of $$eta $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mi>η</mml:mi> </mml:math> and $$zeta $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mi>ζ</mml:mi> </mml:math> , we study its evolution in the light of low redshift observations. We show that at the large redshift, the SIDM viscosity is small, but at the small redshift, it becomes sufficiently large and contributes significantly to cosmic dissipation. As a consequence, viscous SIDM can explain the low redshift observations and also consistent with the standard cosmological prediction." @default.
- W3007874776 created "2020-03-06" @default.
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- W3007874776 date "2022-11-24" @default.
- W3007874776 modified "2023-10-18" @default.
- W3007874776 title "Exploring the self interacting dark matter properties from low redshift observations" @default.
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- W3007874776 doi "https://doi.org/10.1140/epjc/s10052-022-10907-8" @default.
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