The two-component virial theorem and the acceleration-discrepancy relation

We revisit the "two-component virial theorem" (2VT) in the light of recent theoretical and observational results related to the "dark matter"(DM) problem. This modification of the virial theorem offers a physically meaningful framework to investigate possible dynamical couplings...

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Bibliographic Details
Published in:arXiv.org 2017-10
Main Authors: Dantas, Christine C, Ribeiro, Andre L B, Capelato, Hugo V
Format: Article
Language:English
Subjects:
Acceleration
Couplings
Dark matter
Virial theorem
Online Access:Get full text
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Summary:We revisit the "two-component virial theorem" (2VT) in the light of recent theoretical and observational results related to the "dark matter"(DM) problem. This modification of the virial theorem offers a physically meaningful framework to investigate possible dynamical couplings between the baryonic and DM components of extragalactic systems. In particular, we examine the predictions of the 2VT with respect to the "acceleration-discrepancy relation" (ADR). Considering the combined data (composed of systems supported by rotation and by velocity dispersion), we find that: (i) the overall behavior of the 2VT is consistent with the ADR; and (ii) the 2VT predicts a nearly constant behavior in the lower acceleration regime, as suggested in recent data on dwarf spheroidals. We also briefly comment on possible differentiations between the 2VT and some modified gravity theories.
ISSN:2331-8422
DOI:10.48550/arxiv.1705.02918