skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Constraining inflation with future galaxy redshift surveys

Abstract

With future galaxy surveys, a huge number of Fourier modes of the distribution of the large scale structures in the Universe will become available. These modes are complementary to those of the CMB and can be used to set constraints on models of the early universe, such as inflation. Using a MCMC analysis, we compare the power of the CMB with that of the combination of CMB and galaxy survey data, to constrain the power spectrum of primordial fluctuations generated during inflation. We base our analysis on the Planck satellite and a spectroscopic redshift survey with configuration parameters close to those of the Euclid mission as examples. We first consider models of slow-roll inflation, and show that the inclusion of large scale structure data improves the constraints by nearly halving the error bars on the scalar spectral index and its running. If we attempt to reconstruct the inflationary single-field potential, a similar conclusion can be reached on the parameters characterizing the potential. We then study models with features in the power spectrum. In particular, we consider ringing features produced by a break in the potential and oscillations such as in axion monodromy. Adding large scale structures improves the constraints onmore » features by more than a factor of two. In axion monodromy we show that there are oscillations with small amplitude and frequency in momentum space that are undetected by CMB alone but can be measured by including galaxy surveys in the analysis.« less

Authors:
;  [1];  [2]
  1. CEA, Institut de Physique Théorique, 91191 Gif-sur-Yvette cédex (France)
  2. Institute of Sciences of the Cosmos (ICCUB), University of Barcelona, Marti i Franques 1, Barcelona 08024 (Spain)
Publication Date:
OSTI Identifier:
22280108
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2012; Journal Issue: 04; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTROPHYSICS; COMPARATIVE EVALUATIONS; COSMOLOGY; FLUCTUATIONS; GALAXIES; INFLATIONARY UNIVERSE; MONTE CARLO METHOD; OSCILLATIONS; POTENTIALS; RED SHIFT; RELICT RADIATION; SCALARS; SPACE; UNIVERSE

Citation Formats

Huang, Zhiqi, Vernizzi, Filippo, and Verde, Licia. Constraining inflation with future galaxy redshift surveys. United States: N. p., 2012. Web. doi:10.1088/1475-7516/2012/04/005.
Huang, Zhiqi, Vernizzi, Filippo, & Verde, Licia. Constraining inflation with future galaxy redshift surveys. United States. doi:10.1088/1475-7516/2012/04/005.
Huang, Zhiqi, Vernizzi, Filippo, and Verde, Licia. Sun . "Constraining inflation with future galaxy redshift surveys". United States. doi:10.1088/1475-7516/2012/04/005.
@article{osti_22280108,
title = {Constraining inflation with future galaxy redshift surveys},
author = {Huang, Zhiqi and Vernizzi, Filippo and Verde, Licia},
abstractNote = {With future galaxy surveys, a huge number of Fourier modes of the distribution of the large scale structures in the Universe will become available. These modes are complementary to those of the CMB and can be used to set constraints on models of the early universe, such as inflation. Using a MCMC analysis, we compare the power of the CMB with that of the combination of CMB and galaxy survey data, to constrain the power spectrum of primordial fluctuations generated during inflation. We base our analysis on the Planck satellite and a spectroscopic redshift survey with configuration parameters close to those of the Euclid mission as examples. We first consider models of slow-roll inflation, and show that the inclusion of large scale structure data improves the constraints by nearly halving the error bars on the scalar spectral index and its running. If we attempt to reconstruct the inflationary single-field potential, a similar conclusion can be reached on the parameters characterizing the potential. We then study models with features in the power spectrum. In particular, we consider ringing features produced by a break in the potential and oscillations such as in axion monodromy. Adding large scale structures improves the constraints on features by more than a factor of two. In axion monodromy we show that there are oscillations with small amplitude and frequency in momentum space that are undetected by CMB alone but can be measured by including galaxy surveys in the analysis.},
doi = {10.1088/1475-7516/2012/04/005},
journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 04,
volume = 2012,
place = {United States},
year = {2012},
month = {4}
}