Scalar fields in scalar-tensor gravity produce EM radiation through φFμνFμν coupling with resonance amplification that differs from ALP φFμν~Fμν signals, enabling potential distinction and modified gravity tests.
Radial acceleration relation from symmetron fifth forces
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abstract
We show that the radial acceleration relation for rotationally-supported galaxies may be explained, in the absence of cold dark matter, by a non-minimally coupled scalar field, whose fifth forces are partially screened on galactic scales by the symmetron mechanism. In addition, we show that sufficient energy is stored in the symmetron field to explain the dynamic stability of galactic disks.
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Scalar-Induced Electromagnetic Radiation: Comparison with Axion-Like Particles and Implications for Modified Gravity
Scalar fields in scalar-tensor gravity produce EM radiation through φFμνFμν coupling with resonance amplification that differs from ALP φFμν~Fμν signals, enabling potential distinction and modified gravity tests.