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- W3039528083 abstract "When dark matter is a perfect fluid, using the equation of state can get the density profile in the static and spherically symmetric space-time. If the equation of state is independent of the scaling transformation, its lower order approximation can naturally lead to a special case, i.e. $p=zetarho+2epsilon V_{rot}^{2}rho$, where $p$ and $rho$ are the the pressure and density, $V_{rot}$ is the rotation velocity of galaxy, $zeta$ and $ epsilon$ are positive constants. Then we use this equation of state to derive the mass density profiles of dark matter halos. It can obtain a profile which is similar to the pseudo-isothermal halo model when $epsilon$ is around $0.15$. It can perfectly fit the observed rotation curves of low surface brightness (LSB) galaxies. When $zeta=0$, there exits a power law density in the very outer region which surround a black hole, and its power index is $-frac{1+4epsilon}{4epsilon}$. The term $zetarho$ can lead to a constant-density core. If the equation of state include the polytropic model, i.e. $p= frac{zeta}{rho_{0}^{s}}rho^{1+s}+ 2epsilon V_{rot}^{2}rho$, we can get other kinds of density profiles, such as the profile which is nearly same with the Burkert profile, where $s$ and $rho_{0}$ are positive constants." @default.
- W3039528083 created "2020-07-10" @default.
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- W3039528083 date "2020-07-07" @default.
- W3039528083 modified "2023-10-16" @default.
- W3039528083 title "Dark Matter as Perfect Fluid in Low Surface Brightness Galaxies" @default.
- W3039528083 hasPublicationYear "2020" @default.
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