Strengthening the bound on the mass of the lightest neutrino with terrestrial and cosmological experiments. (arXiv:2009.03287v1 [astro-ph.CO])
The <a href="http://arxiv.org/find/astro-ph/1/au:+Workgroup_G/0/1/0/all/0/1">GAMBIT Cosmology Workgroup</a>: <a href="http://arxiv.org/find/astro-ph/1/au:+Stocker_P/0/1/0/all/0/1">Patrick St&#xf6;cker</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Balazs_C/0/1/0/all/0/1">Csaba Bal&#xe1;zs</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bloor_S/0/1/0/all/0/1">Sanjay Bloor</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bringmann_T/0/1/0/all/0/1">Torsten Bringmann</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Gonzalo_T/0/1/0/all/0/1">Tom&#xe1;s E. Gonzalo</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Handley_W/0/1/0/all/0/1">Will Handley</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hotinli_S/0/1/0/all/0/1">Selim Hotinli</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Howlett_C/0/1/0/all/0/1">Cullan Howlett</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kahlhoefer_F/0/1/0/all/0/1">Felix Kahlhoefer</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Renk_J/0/1/0/all/0/1">Janina J. Renk</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Scott_P/0/1/0/all/0/1">Pat Scott</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Vincent_A/0/1/0/all/0/1">Aaron C. Vincent</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+White_M/0/1/0/all/0/1">Martin White</a>

We determine the upper limit on the mass of the lightest neutrino from the
most robust recent cosmological and terrestrial data. Marginalising over
possible effective relativistic degrees of freedom at early times
($N_mathrm{eff}$) and assuming normal mass ordering, the mass of the lightest
neutrino is less than 0.037 eV at 95% confidence; with inverted ordering, the
bound is 0.042 eV. This improves nearly 60% on other recent limits, bounding
the mass of the lightest neutrino to be barely larger than the largest mass
splitting. We show the impacts of realistic mass models, and different sources
of $N_mathrm{eff}$.

We determine the upper limit on the mass of the lightest neutrino from the
most robust recent cosmological and terrestrial data. Marginalising over
possible effective relativistic degrees of freedom at early times
($N_mathrm{eff}$) and assuming normal mass ordering, the mass of the lightest
neutrino is less than 0.037 eV at 95% confidence; with inverted ordering, the
bound is 0.042 eV. This improves nearly 60% on other recent limits, bounding
the mass of the lightest neutrino to be barely larger than the largest mass
splitting. We show the impacts of realistic mass models, and different sources
of $N_mathrm{eff}$.

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