On the universality of MOG weak field approximation at galaxy cluster scale

  • In its weak field limit, Scalar-tensor-vector gravity theory introduces a Yukawa-correction to the gravitational potential. Such a correction depends on the two parameters, α which accounts for the modification of the gravitational constant, and μ∗−1 wwhich represents the scale length on which the scalar field propagates. These parameters were found to be universal when the modified gravitational potential was used to fit the galaxy rotation curves and the mass profiles of galaxy clusters, both without Dark Matter. We test the universality of these parameters using the temperature anisotropies due to the thermal Sunyaev–Zeldovich effect. In our model the intra-cluster gas is in hydrostatic equilibrium within the modified gravitational potential well and it is described by a polytropic equation of state. We predict the thermal Sunyaev–Zeldovich temperature anisotropies produced by Coma cluster, and we compare them with those obtained using the Planck 2013 Nominal maps. In our analysis, we find α and the scale length, respectively, to be consistent and to depart from their universal values. Our analysis points out that the assumption of the universality of the Yukawa-correction to the gravitational potential is ruled out at more than 3.5σ at galaxy clusters scale, while demonstrating that such a theory of gravity is capable to fit the cluster profile if the scale dependence of the gravitational potential is restored.

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Author:Ivan De MartinoORCiD, Mariafelicia De LaurentisORCiD
URN:urn:nbn:de:hebis:30:3-450526
DOI:https://doi.org/10.1016/j.physletb.2017.05.012
ISSN:0370-2693
ArXiv Id:http://arxiv.org/abs/1705.02366
Parent Title (English):Physics letters. B
Publisher:North-Holland Publ.
Place of publication:Amsterdam
Contributor(s):Scott Dodelson
Document Type:Article
Language:English
Date of Publication (online):2017/11/14
Date of first Publication:2017/05/10
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2017/11/14
Volume:770
Page Number:5
First Page:440
Last Page:444
Note:
© 2017 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
HeBIS-PPN:425328899
Institutes:Physik / Physik
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Sammlungen:Universitätspublikationen
Licence (German):License LogoCreative Commons - Namensnennung 4.0