Galaxy rotation curves from General Relativity with Renormalization Group corrections

Details Galaxy rotation curves from General Relativity with Renormalization Group corrections Galaxy rotation curves from General Relativity with Renormalization Group corrections

2009-11-26

arxiv.org/abs/0911.4967v4

JCAP04(2010)020

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

35 pages, 12 PDF figures. v4: Version accepted in JCAP. Improved comments on the galactic gas effects to our model, stressed t

Scientific paper

10.1088/1475-7516/2010/04/020

We consider the application of quantum corrections computed using renormalization group arguments in the astrophysical domain and show that, for the most natural interpretation of the renormalization group scale parameter, a gravitational coupling parameter $G$ varying $10^{-7}$ of its value across a galaxy (which is roughly a variation of $10^{-12}$ per light-year) is sufficient to generate galaxy rotation curves in agreement with the observations. The quality of the resulting fit is similar to the Isothermal profile quality once both the shape of the rotation curve and the mass-to-light ratios are considered for evaluation. In order to perform the analysis, we use recent high quality data from nine regular disk galaxies. For the sake of comparison, the same set of data is modeled also for the Modified Newtonian Dynamics (MOND) and for the recently proposed Scalar Tensor Vector Gravity (STVG). At face value, the model based on quantum corrections clearly leads to better fits than these two alternative theories.

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