Selected Honorable Mention EssaysNo Access

The redshift-dependence of radial acceleration: Modified gravity versus particle dark matter

Sabine Hossenfelder

http://orcid.org/0000-0002-2515-3842

Frankfurt Institute for Advanced Studies, Ruth-Moufang-Str. 1, D-60438 Frankfurt am Main, Germany

E-mail Address: sabine.hossenfelder@gmail.com

E-mail Address: hossi@fias.uni-frankfurt.de

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and

Tobias Mistele

Frankfurt Institute for Advanced Studies, Ruth-Moufang-Str. 1, D-60438 Frankfurt am Main, Germany

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https://doi.org/10.1142/S0218271818470107Cited by:12 (Source: Crossref)

This article is part of the issue:

SPECIAL ISSUE — Selected Essays from the Annual Essay Competition of the Gravity Research Foundation 2018 and Invited Papers; Editor: D. V. Ahluwalia

Abstract

Modified Newtonian Dynamics has one free parameter and requires an interpolation function to recover the normal Newtonian limit. We here show that this interpolation function is unnecessary in a recently proposed covariant completion of Erik Verlinde’s emergent gravity, and that Verlinde’s approach moreover fixes the function’s one free parameter. The so-derived correlation between the observed acceleration (inferred from rotation curves) and the gravitational acceleration due to merely the baryonic matter fits well with data. We then argue that the redshift-dependence of galactic rotation curves could offer a way to tell apart different versions of modified gravity from particle dark matter.

This essay received an Honorable Mention in the 2018 Essay Competition of the Gravity Research Foundation.

Keywords:

PACS: 04.50.Kd, 95.35.+d

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