The paper "Negative neutrino masses as a mirage of dark energy" by Willem Elbers, Carlos S. Frenk, Adrian Jenkins, Baojiu Li, and Silvia Pascoli explores the tension between cosmological constraints on neutrino masses and laboratory constraints. The authors introduce an effective neutrino mass parameter that can take negative values, allowing for a more comprehensive analysis of the data. They analyze data from Planck, ACT, and DESI, finding a 2.8 – 3.3σ tension with the constraints from oscillation experiments. Motivated by recent hints of evolving dark energy, they also examine the w0w2a and mirage dark energy models, which favor larger neutrino masses consistent with laboratory data. The results suggest that the tension can be resolved by adopting evolving dark energy models, which provide a better fit to both the CMB lensing data and the expansion history. The study highlights the importance of relaxing the physical constraint on neutrino masses and the potential of evolving dark energy models in addressing the cosmological constraints on neutrino masses.The paper "Negative neutrino masses as a mirage of dark energy" by Willem Elbers, Carlos S. Frenk, Adrian Jenkins, Baojiu Li, and Silvia Pascoli explores the tension between cosmological constraints on neutrino masses and laboratory constraints. The authors introduce an effective neutrino mass parameter that can take negative values, allowing for a more comprehensive analysis of the data. They analyze data from Planck, ACT, and DESI, finding a 2.8 – 3.3σ tension with the constraints from oscillation experiments. Motivated by recent hints of evolving dark energy, they also examine the w0w2a and mirage dark energy models, which favor larger neutrino masses consistent with laboratory data. The results suggest that the tension can be resolved by adopting evolving dark energy models, which provide a better fit to both the CMB lensing data and the expansion history. The study highlights the importance of relaxing the physical constraint on neutrino masses and the potential of evolving dark energy models in addressing the cosmological constraints on neutrino masses.