Derivative couplings of a k-essence dark-energy scalar to a 2HDM+a pseudoscalar make the mediator’s invisible width and kinematics depend on the dark-energy sound speed c_s².
Berbig, JCAP03, 015, arXiv:2412.07418 [astro- ph.CO]
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Extended analysis constrains pseudo-scalar dark energy potentials using expansion history and cosmic birefringence, finding quadratic, linear, and Ratra-Peebles forms viable near GUT scale while axion-like requires large anomaly coefficient.
Two three-parameter extensions of the mAH dark energy parametrization are compared to LambdaCDM, wCDM, CPL and others using CMB, DESI BAO, H(z), RSD and three SNIa samples, yielding Delta chi-squared improvements of 6-38 and 2-5 sigma tensions with LambdaCDM.
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Derivative couplings of a k-essence dark-energy scalar to a 2HDM+a pseudoscalar make the mediator’s invisible width and kinematics depend on the dark-energy sound speed c_s².
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Extended analysis constrains pseudo-scalar dark energy potentials using expansion history and cosmic birefringence, finding quadratic, linear, and Ratra-Peebles forms viable near GUT scale while axion-like requires large anomaly coefficient.
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Beyond CPL: Evidence for dynamical dark energy in three-parameter models
Two three-parameter extensions of the mAH dark energy parametrization are compared to LambdaCDM, wCDM, CPL and others using CMB, DESI BAO, H(z), RSD and three SNIa samples, yielding Delta chi-squared improvements of 6-38 and 2-5 sigma tensions with LambdaCDM.