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.
A search for chameleon particles using a photon regeneration technique
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We report the first results from the GammeV search for chameleon particles, which may be created via photon-photon interactions within a strong magnetic field. Chameleons are hypothesized scalar fields that could explain the dark energy problem. We implement a novel technique to create and trap the reflective particles within a jar and to detect them later via their afterglow as they slowly convert back into photons. These measurements provide the first experimental constraints on the couplings of chameleons to photons.
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A comprehensive review of modified gravity theories and their cosmological consequences, including a parameterized post-Friedmannian formalism for constraining deviations from General Relativity.
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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.
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Modified Gravity and Cosmology
A comprehensive review of modified gravity theories and their cosmological consequences, including a parameterized post-Friedmannian formalism for constraining deviations from General Relativity.