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- W1818205983 abstract "With the advent of large scale galaxy surveys, constraints on primordial non-Gaussianity (PNG) are expected to reach ${cal O}(f_text{NL}) sim 1$. In order to fully exploit the potential of these future surveys, a deep theoretical understanding of the signatures imprinted by PNG on the large scale structure of the Universe is necessary. In this paper, we explore the effect of a stochastic moving barrier on the amplitude of the non-Gaussian bias induced by local quadratic PNG. We show that, in the peak approach to halo clustering, the amplitude of the non-Gaussian bias will generally differ from the peak-background split prediction unless the barrier is flat and deterministic. For excursion set peaks with a square-root barrier, which reproduce reasonably well the linear bias $b_1$ and mass function $bar{n}_text{h}$ of SO haloes, the non-Gaussian bias amplitude is $sim 40$% larger than the peak-background split expectation $dlnbar{n}_text{h}/dlnsigma_8$ for haloes of mass $sim 10^{13} {it h}^{-1}M_odot$ at $z=0$. Furthermore, we argue that the effect of PNG on squeezed configurations of the halo bispectrum differs significantly from that predicted by standard local bias approaches. Our predictions can be easily confirmed, or invalidated, with N-body simulations." @default.
- W1818205983 created "2016-06-24" @default.
- W1818205983 creator A5033636191 @default.
- W1818205983 creator A5071903163 @default.
- W1818205983 date "2015-06-29" @default.
- W1818205983 modified "2023-09-23" @default.
- W1818205983 title "Scale-dependent bias from an inflationary bispectrum: the effect of a stochastic moving barrier" @default.
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- W1818205983 doi "https://doi.org/10.1093/mnras/stv1174" @default.
- W1818205983 hasPublicationYear "2015" @default.
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