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The Redshift Evolution of the Tully-Fisher Relation as a Test of Modified Gravity | | Christopher Limbach
; Dimitrios Psaltis
; Feryal Ozel
; | | Date: |
17 Sep 2008 | | Abstract: | The redshift evolution of the Tully-Fisher Relation probes gravitational
dynamics that must be consistent with any modified gravity theory seeking to
explain the galactic rotation curves without the need for dark matter. Within
the context of non-relativistic Modified Newtonian Dynamics (MOND), the
characteristic acceleration scale of the theory appears to be related to the
current value of either the Hubble constant, i.e., alpha ~ cH_0, or the dark
energy density, i.e., alpha (8 pi G rho_lambda/3)^{1/2}. If these relations are
the manifestation of a fundamental coupling of a_0 to either of the two
cosmological parameters, the cosmological evolution would then dictate a
particular dependence of the MOND acceleration scale with redshift that can be
tested with Tully-Fisher relations of high-redshift galaxies. We compare this
prediction to two sets of Tully-Fisher data with redshifts up to z=1.2. We find
that both couplings are excluded within the formal uncertainties. However, when
we take into account the potential systematic uncertainties in the data, we
find that they marginally favor the coupling of the MOND acceleration scale to
the density of dark energy. | | Source: | arXiv, 0809.2790 | | Services: | Forum | Review | PDF | Favorites | |
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