Testing gravity with E{sub G}: mapping theory onto observations

Journal Article · Tue Dec 01 00:00:00 EST 2015 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2015/12/051· OSTI ID:22525097

Leonard, C. Danielle; Ferreira, Pedro G. ^[1]; Heymans, Catherine ^[2]

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1. Astrophysics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford, OX1 3RH U.K. (United Kingdom)
2. Institute for Astronomy, University of Edinburgh, Blackford Hill, Edinburgh, EH9 3HJ U.K. (United Kingdom)

We present a complete derivation of the observationally motivated definition of the modified gravity statistic E{sub G}. Using this expression, we investigate how variations to theory and survey parameters may introduce uncertainty in the general relativistic prediction of E{sub G}. We forecast errors on E{sub G} for measurements using two combinations of upcoming surveys, and find that theoretical uncertainties may dominate for a futuristic measurement. Finally, we compute predictions of E{sub G} under modifications to general relativity in the quasistatic regime, and comment on the pros and cons of using E{sub G} to test gravity with future surveys.

• OSTI ID: 22525097
• Journal Information: Journal of Cosmology and Astroparticle Physics, Vol. 2015, Issue 12; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
COSMOLOGY
ERRORS
GENERAL RELATIVITY THEORY
GRAVITATION
MAPPING
MODIFICATIONS
RELATIVISTIC RANGE
VARIATIONS