scholarly journals Toward a more stringent test of gravity with the redshift space power spectrum: Simultaneous probe of growth and amplitude of large-scale structure

2021 ◽  
Vol 104 (4) ◽  
Author(s):  
Yong-Seon Song ◽  
Yi Zheng ◽  
Atsushi Taruya
Keyword(s):  
Power Spectrum ◽  
Large Scale ◽  
Large Scale Structure ◽  
Scale Structure ◽  
Stringent Test

scholarly journals Using the Marked Power Spectrum to Detect the Signature of Neutrinos in Large-Scale Structure

2021 ◽  
Vol 126 (1) ◽  
Author(s):  
Elena Massara ◽  
Francisco Villaescusa-Navarro ◽  
Shirley Ho ◽  
Neal Dalal ◽  
David N. Spergel
Keyword(s):  
Power Spectrum ◽  
Large Scale ◽  
Large Scale Structure ◽  
Scale Structure

scholarly journals Anti-symmetric clustering signals in the observed power spectrum

2021 ◽  
Vol 2021 (12) ◽  
pp. 003
Author(s):  
José Fonseca ◽  
Chris Clarkson
Keyword(s):  
Dark Matter ◽  
Power Spectrum ◽  
Euler Equation ◽  
Large Scale ◽  
Signal To Noise Ratio ◽  
Power Spectra ◽  
Large Scale Structure ◽  
Scale Structure ◽  
Signal To Noise ◽  
Peculiar Velocities

Abstract In this paper, we study how to directly measure the effect of peculiar velocities in the observed angular power spectra. We do this by constructing a new anti-symmetric estimator of Large Scale Structure using different dark matter tracers. We show that the Doppler term is the major component of our estimator and we show that we can measure it with a signal-to-noise ratio up to ∼ 50 using a futuristic SKAO HI galaxy survey. We demonstrate the utility of this estimator by using it to provide constraints on the Euler equation.

scholarly journals Estimates for the impact of ultraviolet background fluctuations on galaxy clustering measurements

2019 ◽  
Vol 485 (4) ◽  
pp. 5059-5072 ◽  
Author(s):  
Phoebe Upton Sanderbeck ◽  
Vid Iršič ◽  
Matthew McQuinn ◽  
Avery Meiksin
Keyword(s):  
Power Spectrum ◽  
Large Scale ◽  
Large Scale Structure ◽  
Scale Structure ◽  
Galaxy Surveys ◽  
Intensity Mapping ◽  
Redshift Galaxy ◽  
Halo Gas ◽  
The Cost ◽  
The Impact

ABSTRACT Spatial fluctuations in ultraviolet backgrounds can subtly modulate the distribution of extragalactic sources, a potential signal and systematic for large-scale structure surveys. While this modulation has been shown to be significant for 3D Ly α forest surveys, its relevance for other large-scale structure probes has been hardly explored, despite being the only astrophysical process that likely can affect clustering measurements on the scales of ≳Mpc. We estimate that the background fluctuations, modulating the amount of H i, have a fractional effect of (0.03–0.3) × (k/[10−2 Mpc−1])−1 on the power spectrum of 21 cm intensity maps at z = 1–3. We find a smaller effect for H α and Ly α intensity mapping surveys of (0.001–0.1) × (k/[10−2 Mpc−1])−1 and even smaller effect for more traditional surveys that correlate the positions of individual H α or Ly α emitters. We also estimate the effect of backgrounds on low-redshift galaxy surveys in general based on a simple model in which background fluctuations modulate the rate halo gas cools, modulating star formation: We estimate a maximum fractional effect on the power of ∼0.01 (k/[10−2 Mpc−1])−1 at z = 1. We compare sizes of these imprints to cosmological parameter benchmarks for the next generation of redshift surveys: We find that ionizing backgrounds could result in a bias on the squeezed triangle non-Gaussianity parameter fNL that can be larger than unity for power spectrum measurements with a SPHEREx-like galaxy survey, and typical values of intensity bias. Marginalizing over a shape of the form k−1PL, where PL is the linear matter power spectrum, removes much of this bias at the cost of ${\approx } 40{{\ \rm per\ cent}}$ larger statistical errors.

scholarly journals Power spectrum response of large-scale structure in 1D and in 3D: tests of prescriptions for post-collapse dynamics

2020 ◽  
Vol 499 (2) ◽  
pp. 1769-1787
Author(s):  
Anaëlle Halle ◽  
Takahiro Nishimichi ◽  
Atsushi Taruya ◽  
Stéphane Colombi ◽  
Francis Bernardeau
Keyword(s):  
Power Spectrum ◽  
Response Function ◽  
Large Scale ◽  
Initial Conditions ◽  
Large Scale Structure ◽  
Scale Structure ◽  
Adaptive Smoothing ◽  
Single Stream ◽  
Non Linear ◽  
Spectrum Response

ABSTRACT The power spectrum response function of the large-scale structure of the Universe describes how the evolved power spectrum is modified by a small change in initial power through non-linear mode coupling of gravitational evolution. It was previously found that the response function for the coupling from small to large scales is strongly suppressed in amplitude, especially at late times, compared to predictions from perturbation theory (PT) based on the single-stream approximation. One obvious explanation for this is that PT fails to describe the dynamics beyond shell crossing. We test this idea by comparing measurements in N-body simulations to prescriptions based on PT but augmented with adaptive smoothing to account for the formation of non-linear structures of various sizes in the multistream regime. We first start with one-dimensional (1D) cosmology, where the Zel’dovich approximation provides the exact solution in the single-stream regime. Similarly to the three-dimensional (3D) case, the response function of the large-scale modes exhibits a strong suppression in amplitude at small scales that cannot be explained by the Zel’dovich solution alone. However, by performing adaptive smoothing of initial conditions to identify haloes of different sizes and solving approximately post-collapse dynamics in the three-stream regime, agreement between theory and simulations drastically improves. We extend our analyses to the 3D case using the pinocchio algorithm, in which similar adaptive smoothing is implemented on the Lagrangian PT fields to identify haloes and is combined with a spherical halo prescription to account for post-collapse dynamics. Again, a suppression is found in the coupling between small- and large-scale modes and the agreement with simulations is improved.

scholarly journals Possible Detection of Baryonic Fluctuations in the Large‐Scale Structure Power Spectrum

2001 ◽  
Vol 555 (1) ◽  
pp. 68-73 ◽  
Author(s):  
Christopher J. Miller ◽  
Robert C. Nichol ◽  
David J. Batuski
Keyword(s):  
Power Spectrum ◽  
Large Scale ◽  
Large Scale Structure ◽  
Scale Structure

scholarly journals Observing trans-Planckian ripples in the primordial power spectrum with future large scale structure probes

2008 ◽  
Vol 2008 (09) ◽  
pp. 015 ◽  
Author(s):  
Jan Hamann ◽  
Steen Hannestad ◽  
Martin S Sloth ◽  
Yvonne Y Y Wong
Keyword(s):  
Power Spectrum ◽  
Large Scale ◽  
Large Scale Structure ◽  
Scale Structure ◽  
Primordial Power Spectrum

scholarly journals Dynamical critical phenomena and large-scale structure of the Universe: The power spectrum for density fluctuations

1997 ◽  
Vol 38 (8) ◽  
pp. 637-642 ◽  
Author(s):  
J. F. Barbero G. ◽  
A Dominguez ◽  
T Goldman ◽  
J Pérez-Mercader
Keyword(s):  
Power Spectrum ◽  
Critical Phenomena ◽  
Large Scale ◽  
Large Scale Structure ◽  
Density Fluctuations ◽  
Scale Structure ◽  
Dynamical Critical Phenomena ◽  
The Universe

scholarly journals Red, Straight, no bends: primordial power spectrum reconstruction from CMB and large-scale structure

2016 ◽  
Vol 2016 (08) ◽  
pp. 028-028 ◽  
Author(s):  
Andrea Ravenni ◽  
Licia Verde ◽  
Antonio J. Cuesta
Keyword(s):  
Power Spectrum ◽  
Large Scale ◽  
Large Scale Structure ◽  
Scale Structure ◽  
Spectrum Reconstruction ◽  
Primordial Power Spectrum

scholarly journals Impact of bias and redshift-space modelling for the halo power spectrum: testing the effective field theory of large-scale structure

2020 ◽  
Vol 2020 (07) ◽  
pp. 011-011 ◽  
Author(s):  
Lucía Fonseca de la Bella ◽  
Donough Regan ◽  
David Seery ◽  
David Parkinson
Keyword(s):  
Field Theory ◽  
Power Spectrum ◽  
Effective Field Theory ◽  
Large Scale ◽  
Large Scale Structure ◽  
Effective Field ◽  
Scale Structure
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