For a scalar field coupled to radiation, the paper derives a modified CMB temperature law T(z) = T0(1+z)^(1-ε/4) and argues that positive ε shifts acoustic peaks to larger scales, claiming this eases the Hubble tension.
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Probing Scalar-Photon Coupling in the Early Universe: Implications for CMB Temperature and Anisotropies
For a scalar field coupled to radiation, the paper derives a modified CMB temperature law T(z) = T0(1+z)^(1-ε/4) and argues that positive ε shifts acoustic peaks to larger scales, claiming this eases the Hubble tension.