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Physics
High Energy, Nuclear, Particle Physics
New cosmological neutrino mass constraint: sum<0.09 eV at 95% CL
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[QUOTE="mfb, post: 6514574, member: 405866"] [B]TL;DR Summary:[/B] Updated cosmological neutrino mass constraints start disfavoring the inverted mass ordering arXiv: [url=https://arxiv.org/abs/2106.15267]On the most constraining cosmological neutrino mass bounds[/url] From neutrino mixing we know that an inverted order (two "heavy" neutrinos, one light neutrino) needs a sum of masses of at least ~0.09 eV, while the normal order (two light, one "heavy") can have a sum as low as ~0.05 eV. The measurement is not sensitive enough to clearly rule out the inverted order, but it's a contribution to the question. Other experiments tend to favor the normal order, too. As the name suggests it's the one we expect anyway, because it follows the pattern we see elsewhere. The best fit seems to be a sum of zero, or even negative values if they would be allowed, but the physical region is within the uncertainties. Their fit also produces a Hubble constant of 68.00 +- 0.88 km/(s\*Mpc), close to the Planck results - probably not surprising as they largely use the same data. [/QUOTE]
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Physics
High Energy, Nuclear, Particle Physics
New cosmological neutrino mass constraint: sum<0.09 eV at 95% CL
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