Probing f(R) gravity with PLANCK data on cluster pressure profiles

Spanish Relativity Meeting: almost 100 years after Einstein's revolution

De Martino, I.^1,4 ; De Laurentis, M.^2,3,4 ; Atrio-Barandela, F.^1 ; Capozziello, S.^3,4

Física Teórica, Universidad de Salamanca, Salamanca

37008, Spain^1

Department of Theoretical Physics, Tomsk State Pedagogical University (TSPU), pr. Komsomolsky, 75, Tomsk

634041, Russia^2

Dipartimento di Fisica, Università di Napoli Federico II, Italy^3

INFN Sez. di Napoli Compl., Univ. di Monte S. Angelo, Edificio G, Via Cinthia, Napoli

I-80126, Italy^4

关键词: Cluster of galaxies;    Cluster scale;    Galaxy clusters;    Gravitational potential;    Hydrostatic equilibrium;    Potential wells;    Pressure profiles;    Self-gravitating systems;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/600/1/012048/pdf
DOI  :  10.1088/1742-6596/600/1/012048

来源: IOP

【 摘 要 】

Analytical f(R)-gravity models introduce Yukawa-like corrections to the Newtonian potential in the weak field limit. These models can explain the dynamics of galaxies and cluster of galaxies without requiring dark matter. To test the model, we have computed the pressure profile of 579 X-ray galaxy clusters assuming the gas is in hydrostatic equilibrium within the potential well of the modified gravitational potential. We have compared those profiles with the ones measured in the foreground cleaned SMICA released by the Planck Collaboration. Our results show that Extended Theories of Gravity explain the dynamics of self-gravitating systems at cluster scales and represent an alternative to dark matter haloes.