Testing for gravitational preferred directions with galaxy and lensing surveys



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Aparicio Resco, Miguel and López Maroto, Antonio (2020) Testing for gravitational preferred directions with galaxy and lensing surveys. Journal of cosmology and astroparticle physics (2). ISSN 1475-7516

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Official URL: http://dx.doi.org/10.1088/1475-7516/2020/02/013


We analyze the sensitivity of galaxy and weak-lensing surveys to detect preferred directions in the gravitational interaction. We consider general theories of gravity involving additional vector degrees of freedom with non-vanishing spatial components in the background. We use a model-independent parametrization of the perturbations equations in terms of four effective parameters, namely, the standard effective Newton constant G(eff) and slip parameter gamma for scalar modes and two new parameters mu(Q) and mu(h) for vector and tensor modes respectively, which are required when preferred directions are present. We obtain the expressions for the multipole galaxy power spectrum in redshift space and for the weak-lensing shear, convergence and rotation spectra in the presence of preferred directions. By performing a Fisher matrix forecast analysis, we estimate the sensitivity of a future Euclid-like survey to detect this kind of modification of gravity. We finally compare with the effects induced by violations of statistical isotropy in the primordial power spectrum and identify the observables which could discriminate between them.

Item Type:Article
Additional Information:

© 2020 Iop Publishing.
M.A.R acknowledges support from UCM predoctoral grant. This work has been supported by the MINECO (Spain) project FIS2016-78859-P(AEI/FEDER, UE).

Uncontrolled Keywords:Power spectrum; Dark energy; Weak.
Subjects:Sciences > Physics
ID Code:60595
Deposited On:21 May 2020 16:52
Last Modified:21 May 2020 16:52

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