2026-06-27T22:46:28Zhttps://docta.ucm.es/rest/oai/requestoai:docta.ucm.es:20.500.14352/62672023-08-26T05:51:52Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense
author
Aparicio Resco, Miguel
author
López Maroto, Antonio
2023-06-16T15:18:16Z
2023-06-16T15:18:16Z
2020-02
1475-7516
10.1088/1475-7516/2020/02/013
https://hdl.handle.net/20.500.14352/6267
http://dx.doi.org/10.1088/1475-7516/2020/02/013
https://iopscience.iop.org/
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.
eng
Testing for gravitational preferred directions with galaxy and lensing surveys
journal article
URL
https://docta.ucm.es/bitstreams/9ff41544-6ef4-4822-858f-39e5a9ab7482/download
File
MD5
90851a5ba2762ae5ec7ad33e4cf3f310
722555
application/pdf
MarotoAL88preprint.pdf