Testing gravity at large scales with H i intensity mapping

Alkistis Pourtsidou

doi:10.1093/mnras/stw1406

Testing gravity at large scales with H i intensity mapping

Alkistis Pourtsidou

Institute of Cosmology & Gravitation

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Abstract

We investigate the possibility of testing Einstein's general theory of relativity (GR) and the standard cosmological model via the E_G statistic using neutral hydrogen (H i) intensity mapping. We generalize the Fourier space estimator for E_G to include H i as a biased tracer of matter and forecast statistical errors using H i clustering and lensing surveys that can be performed in the near future, in combination with ongoing and forthcoming optical galaxy and cosmic microwave background (CMB) surveys. We find that fractional errors <1 per cent in the E_G measurement can be achieved in a number of cases and compare the ability of various survey combinations to differentiate between GR and specific modified gravity models. Measuring E_G with intensity mapping and the Square Kilometre Array can provide exquisite tests of gravity at cosmological scales

Original language	English
Pages (from-to)	1457-1464
Number of pages	8
Journal	Monthly Notices of the Royal Astronomical Society
Volume	461
Issue number	2
Early online date	14 Jun 2016
DOIs	https://doi.org/10.1093/mnras/stw1406
Publication status	Published - 11 Sept 2016

Keywords

astro-ph.CO
cosmology
theory
large-scale structure of the universe
gravitational lensing: weak
cosmology: observations
cosmology: theory

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10.1093/mnras/stw1406

Testing gravity at large scales with H i intensity mapping
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
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title = "Testing gravity at large scales with H i intensity mapping",

abstract = "We investigate the possibility of testing Einstein's general theory of relativity (GR) and the standard cosmological model via the EG statistic using neutral hydrogen (H i) intensity mapping. We generalize the Fourier space estimator for EG to include H i as a biased tracer of matter and forecast statistical errors using H i clustering and lensing surveys that can be performed in the near future, in combination with ongoing and forthcoming optical galaxy and cosmic microwave background (CMB) surveys. We find that fractional errors <1 per cent in the EG measurement can be achieved in a number of cases and compare the ability of various survey combinations to differentiate between GR and specific modified gravity models. Measuring EG with intensity mapping and the Square Kilometre Array can provide exquisite tests of gravity at cosmological scales",

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author = "Alkistis Pourtsidou",

note = "9 pages, 4 figures, 1 table; typo in Table 1 corrected, discussion added; version accepted for publication in MNRAS",

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doi = "10.1093/mnras/stw1406",

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AU - Pourtsidou, Alkistis

N1 - 9 pages, 4 figures, 1 table; typo in Table 1 corrected, discussion added; version accepted for publication in MNRAS

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Y1 - 2016/9/11

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AB - We investigate the possibility of testing Einstein's general theory of relativity (GR) and the standard cosmological model via the EG statistic using neutral hydrogen (H i) intensity mapping. We generalize the Fourier space estimator for EG to include H i as a biased tracer of matter and forecast statistical errors using H i clustering and lensing surveys that can be performed in the near future, in combination with ongoing and forthcoming optical galaxy and cosmic microwave background (CMB) surveys. We find that fractional errors <1 per cent in the EG measurement can be achieved in a number of cases and compare the ability of various survey combinations to differentiate between GR and specific modified gravity models. Measuring EG with intensity mapping and the Square Kilometre Array can provide exquisite tests of gravity at cosmological scales

KW - astro-ph.CO

KW - cosmology

KW - theory

KW - large-scale structure of the universe

KW - gravitational lensing: weak

KW - cosmology: observations

KW - cosmology: theory

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DO - 10.1093/mnras/stw1406

M3 - Article

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JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

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Testing gravity at large scales with H i intensity mapping

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