H0 tension, phantom dark energy, and cosmological parameter degeneracies

@article{Alestas2020H0T,
  title={H0
 tension, phantom dark energy, and cosmological parameter degeneracies},
  author={George Alestas and Lavrentios Kazantzidis and Leandros Perivolaropoulos},
  journal={Physical Review D},
  year={2020},
  volume={101},
  pages={123516}
}
Phantom dark energy (w<-1) can produce amplified cosmic acceleration at late times, thus increasing the value of H0 favored by CMB data and releasing the tension with local measurements of H0. We show that the best fit value of H0 in the context of the CMB power spectrum is degenerate with a constant equation-of-state parameter w, in accordance with the approximate effective linear equation H0+30.93w-36.47=0 (H0 in km sec-1 Mpc-1). This equation is derived by assuming that both Ω0mh2 and dA… 

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