论文标题
在存在辐射的情况下，依赖比例依赖性的光环偏置和挤压限制双光谱
Scale-dependent halo bias and the squeezed limit bispectrum in the presence of radiation
论文作者
论文摘要
我们研究了大规模辐射扰动对小规模结构形成的重力作用。除了使物质扰动量表的生长取决于辐射量表之外，辐射的自由流还会影响小规模和大尺度上结构形成之间的耦合。我们使用单独的宇宙n体模拟来研究这一点，以计算（各向同性）挤压限制物质双光谱和线性光环偏置。我们的结果表明，由辐射引起的长波长物质扰动的生长的量表依赖性转化为这些数量，从而获得了$ k \ lyssim 0.05 $ mpc $^{ - 1} $的非平凡规模依赖性。 In a universe with radiation composed of cosmic microwave background photons and three species of massless neutrinos, the bias of halos with $b = 2$ at high $k$ will decrease by $0.29\%,\ 0.45\%$ and $0.8\%$ between $k = 0.05$ Mpc$^{-1}$ and $k = 0.0005$ Mpc$^{-1}$ at RedShifts $ z = 0，\ 1 $和$ 3 $。对于具有$ b \ gg1 $的对象，这些差异方法分别为0.43 \％，\ 0.68 \％$和$ 1.2 \％$。
We investigate the gravitational effect of large-scale radiation perturbations on small-scale structure formation. In addition to making the growth of matter perturbations scale dependent, the free-streaming of radiation also affects the coupling between structure formation at small and large scales. We study this using Separate Universe N-body simulations to compute the (isotropized) squeezed-limit matter bispectrum and the linear halo bias. Our results show that the scale dependence in the growth of long-wavelength matter perturbations, caused by radiation, translates into these quantities acquiring a non-trivial scale-dependence at $k\lesssim 0.05$ Mpc$^{-1}$. In a universe with radiation composed of cosmic microwave background photons and three species of massless neutrinos, the bias of halos with $b = 2$ at high $k$ will decrease by $0.29\%,\ 0.45\%$ and $0.8\%$ between $k = 0.05$ Mpc$^{-1}$ and $k = 0.0005$ Mpc$^{-1}$ at redshifts $z=0,\ 1$, and $3$ respectively. For objects with $b\gg1$, these differences approach $0.43\%,\ 0.68\%$ and $1.2\%$ respectively.
