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Title

Bias deconstructed: unravelling the scale dependence of halo bias using real-space measurements

Authors
Paranjape, Aseem
Sefusatti, Emiliano
Monaco, Pierluigi
Sheth, Ravi K.
Published in Monthly Notices of the Royal Astronomical Society. 2013, vol. 436, no. 1, p. 449-459
Abstract We explore the scale dependence of halo bias using real-space cross-correlation measurements in N-body simulations and in PINOCCHIO, an algorithm based on Lagrangian Perturbation Theory. Recent work has shown how to interpret such real-space measurements in terms of k-dependent bias in Fourier space, and how to remove the k-dependence to reconstruct the k-independent peak-background split halo bias parameters. We compare our reconstruction of the linear bias, which requires no free parameters, with previous estimates from N-body simulations which were obtained directly in Fourier space at large scales, and find very good agreement. Our reconstruction of the quadratic bias is similarly parameter-free, although in this case there are no previous Fourier space measurements to compare with. Our analysis of N-body simulations explicitly tests the predictions of the excursion set peaks (ESP) formalism of Paranjape et al. for the scale dependence of bias; we find that the ESP predictions accurately describe our measurements. In addition, our measurements in PINOCCHIO serve as a useful, successful consistency check between PINOCCHIO and N-body simulations that is not accessible to traditional measurements.
Keywords Large-scale structure of Universe
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PARANJAPE, Aseem et al. Bias deconstructed: unravelling the scale dependence of halo bias using real-space measurements. In: Monthly Notices of the Royal Astronomical Society, 2013, vol. 436, n° 1, p. 449-459. https://archive-ouverte.unige.ch/unige:35144

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Deposited on : 2014-03-31

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