Treating longitudinal and transverse polarizations of light Z' bosons independently modifies the SN1987A bounds on their parameter space in the Lμ-Lτ model.
Neff at CMB challenges U(1)X light gauge boson scenarios,
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Gravity-mediated production of scalar and vector dark radiation yields Planck 2018 constraints on reheating temperature T_RH and background equation of state w_Φ, with comparisons to right-handed neutrinos, ALPs, and a generic spin-2 mediator.
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SN1987A Constraints of Light $\boldsymbol{Z'}$ with Non-Mixing Polarisations
Treating longitudinal and transverse polarizations of light Z' bosons independently modifies the SN1987A bounds on their parameter space in the Lμ-Lτ model.
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CMB signatures of gravity-mediated dark radiation in $\mathbf{\Delta N_{\rm eff}}$
Gravity-mediated production of scalar and vector dark radiation yields Planck 2018 constraints on reheating temperature T_RH and background equation of state w_Φ, with comparisons to right-handed neutrinos, ALPs, and a generic spin-2 mediator.