Treating the baryogenesis operator as part of the action yields modified Friedmann and Raychaudhuri equations with an effective Planck mass M_eff² = M_Pl² - 2λ ∇_μ J^μ for the vector-density realization of the current.
Uzan, Living Rev
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abstract
Fundamental constants are a cornerstone of our physical laws. Any constant varying in space and/or time would reflect the existence of an almost massless field that couples to matter. This will induce a violation of the universality of free fall. It is thus of utmost importance for our understanding of gravity and of the domain of validity of general relativity to test for their constancy. We thus detail the relations between the constants, the tests of the local position invariance and of the universality of free fall. We then review the main experimental and observational constraints that have been obtained from atomic clocks, the Oklo phenomenon, Solar system observations, meteorites dating, quasar absorption spectra, stellar physics, pulsar timing, the cosmic microwave background and big bang nucleosynthesis. At each step we describe the basics of each system, its dependence with respect to the constants, the known systematic effects and the most recent constraints that have been obtained. We then describe the main theoretical frameworks in which the low-energy constants may actually be varying and we focus on the unification mechanisms and the relations between the variation of different constants. To finish, we discuss the more speculative possibility of understanding their numerical values and the apparent fine-tuning that they confront us with.
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Ultralight dark matter exhibits recoherence due to the solar gravitational potential, yielding formally divergent coherence times at long timescales and enhanced search sensitivity.
In asymptotically safe gravity, dimension-five couplings of ultralight scalar dark matter to gauge field strengths vanish and are not generated perturbatively.
Cluster gas fractions and Pantheon+ supernovae support constant speed of light under CLASH and CCCP mass calibrations but indicate 2σ tension under Planck calibration.
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Gravitational baryogenesis beyond the spectator approximation
Treating the baryogenesis operator as part of the action yields modified Friedmann and Raychaudhuri equations with an effective Planck mass M_eff² = M_Pl² - 2λ ∇_μ J^μ for the vector-density realization of the current.
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Is the Conventional Picture of Coherence Time Complete? Dark Matter Recoherence
Ultralight dark matter exhibits recoherence due to the solar gravitational potential, yielding formally divergent coherence times at long timescales and enhanced search sensitivity.
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Towards theory constraints on ultralight dark matter from quantum gravity
In asymptotically safe gravity, dimension-five couplings of ultralight scalar dark matter to gauge field strengths vanish and are not generated perturbatively.
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Revisiting the Constancy of the Speed of Light: Galaxy Cluster Mass Bias Implications
Cluster gas fractions and Pantheon+ supernovae support constant speed of light under CLASH and CCCP mass calibrations but indicate 2σ tension under Planck calibration.