A semianalytic ΛCDM cluster model with angular momentum, dynamical friction, and external pressure produces a mass-temperature relation that mimics f(R) and symmetron predictions, weakening the MTR as a gravity probe.
Gravitational waves in bimetric MOND
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abstract
I consider the weak field limit (WFL) of bimetric MOND (BIMOND): the lowest order in the small departures Hmn and H'mn from double Minkowski space-time. In particular, I look at propagating solutions, for a favorite subclass of BIMOND. The WFL splits into two sectors for two linear combinations, Hmn+ and Hmn-, of Hmn and H'mn. The Hmn+ sector is equivalent to the WFL of general relativity (GR), with its gauge freedom, and has the same vacuum gravitational waves. The Hmn- sector is fully nonlinear even for the weakest Hmn-, and inherits none of the coordinate gauge freedom. The equations of motion are scale invariant in the deep-MOND limit of purely gravitational systems. In these last two regards, the BIMOND WFL is greatly different from that of other bimetric theories studied to date. Despite the strong nonlinearity, an arbitrary pair of harmonic GR wave packets of Hmn and H'mn moving in the same direction, is a solution of the (vacuum) BIMOND WFL.
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astro-ph.CO 1years
2019 1verdicts
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Mass-Temperature relation in $\Lambda$CDM and modified gravity
A semianalytic ΛCDM cluster model with angular momentum, dynamical friction, and external pressure produces a mass-temperature relation that mimics f(R) and symmetron predictions, weakening the MTR as a gravity probe.