New test on general relativity and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>f</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mi>T</mml:mi><mml:mo stretchy="false">)</mml:mo></mml:math> torsional gravity from galaxy-galaxy weak lensing surveys

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書誌事項

公開日
2020-11-16
権利情報
  • https://link.aps.org/licenses/aps-default-license
DOI
  • 10.1103/physrevd.102.104044
  • 10.48550/arxiv.1907.12225
公開者
American Physical Society (APS)

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説明

We use galaxy-galaxy weak lensing data to perform a novel test on general relativity (GR) and $f(T)$ torsional gravity. In particular, we impose strong constraints using the torsional (teleparallel) formulation of gravity in which the deviation from GR is quantified by a single parameter $��$, an approximation which is always valid at low-redshift Universe and weak gravitational fields. We calculate the difference in the deflection angle and eventually derive the modified excess surface density profile, which is mainly affected at small scales. Confronting the predictions with weak lensing data from the Sloan Digital Sky Survey Data Release 7, we obtain the upper bound on the deviation parameter, which, expressed via the dimensionless percentage in the Universe energy content, reads as ${\rm{log_{10}}}��_��\le -18.52_{-0.42}^{+0.80}$(stat)$_{-0.37}^{+1.50}$(sys)$ [R_c/0.015R_{200}]$ with systematics mainly arising from the modelling of astrophysics, upon a reasonable choice of cut-off radius for $f(T)$ gravity in form of $T + ��T^2$. To our knowledge, this is the first time that GR is verified at such an accuracy at the corresponding scales.

8 pages, 2 figures, comments are welcome. Updated with discussions on systematics to match the published version

収録刊行物

  • Physical Review D

    Physical Review D 102 (10), 104044-, 2020-11-16

    American Physical Society (APS)

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