Direct search for mass of neutrino and anomaly in the tritium beta-spectrum

Lobashev, V.M.; Асеев, В. А.; Belesev, A. I.; Berlëv, A. I.; Geraskin, E. V.; Голубев, А. А.; Kazachenko, O.; Kuznetsov, Yu. E.; Ostroumov, Roman; Rivkis, L. A.; Stern, B. E.; Titov, N.; Zadorozhny, S. V.; Zakharov, Yu. I.

doi:10.1016/s0370-2693(99)00781-9

Cited by 312 publications

(224 citation statements)

References 9 publications

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“…Direct observational bounds on neutrino masses, found kinematically, are: m ν e < 10 eV (Weinheimer et al 1999;Lobashev et al 1999;Particle Data Group 2000); m ν τ < 170 keV (Assmagan et al 1996); and m ν τ < 18 MeV (Buskulic et al 1995;Passalacqua 1997). In the absence of degeneracy, e-neutrinos decouple at K B T D (ν e ) ≈ 2.0 MeV, and μ and τ neutrinos at Freese et al 1983).…”

Section: Dependence On M Of the Degeneracy Of A Cosmological Backgroumentioning

confidence: 99%

Mass limits for dark clusters of degenerate fermions

Membrado

Pacheco

2013

A&A

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We calculate the range of possible masses for dark spheres of bound fully degenerate fermions as a function of the fermion mass. The cosmological constant is included in our calculations. We deduce that the minimum fermion mass that is able to give rise to degenerate fermion clusters is ∼0.02 g −1/4 eV, where g is the spin degeneracy parameter. We show that degenerate fermions of mc 2 ≈ (15−30) g −1/4 eV can build bound degenerate dark haloes that could reproduce the values of the rotation velocities of galaxies. The masses and radii derived for these degenerate dark haloes of typical galaxies, without considering any cosmological information, agree with the Jeans masses and radii of a cosmological background of ∼(20−30) g −1/4 eV degenerate fermions at redshift z ≈ 50. However, degenerate fermion objects of 10 15 M composed of these particles are too small to constitute the dark halo of galaxy clusters. We also derive degeneracy conditions for hot and cold dark matter fermions.

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Section: Dependence On M Of the Degeneracy Of A Cosmological Backgroumentioning

confidence: 99%

Mass limits for dark clusters of degenerate fermions

Membrado

Pacheco

2013

A&A

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“…If equation (52) and therefore also eq. (97) is valid, we see that the contribution of a pair of particles Ψ (n) ±,1 to the final baryon asymmetry is independent of their actual masses, since K (n) +,1 − K (n) −,1 = 2M 1 /M 1,n , which means the M 1,n in the denominator will cancel with the M 1,n in ε 1 .…”

Section: Leptogenesismentioning

confidence: 99%

“…[51][52][53]). In scenarios that evade the Davidson-Ibarra bound, the upper mass bound on the light neutrino masses can be relaxed even further.…”

Section: Upper Mass Bound For Mmentioning

confidence: 99%

Leptogenesis with many neutrinos

Eisele¹

2008

Phys. Rev. D

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We consider leptogenesis in scenarios with many neutrino singlets. We find that the lower bound for the reheating temperature can be significantly relaxed with respect to the hierarchical three neutrino case. We further argue that the upper bound for the neutrino mass scale from leptogenesis gets significantly lifted in these scenarios. As a specific realization, we then discuss an extra-dimensional model, where the large number of neutrinos is provided by Kaluza-Klein excitations. *

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“…The KATRIN experiment is based on technology developed by the Mainz and Troitsk tritium beta decay experiments [20,21]. These experiments used a MAC-E-Filter (Magnetic Adiabatic Collimation combined with an Electrostatic Filter) [22].…”

Section: Case 1: Large-scale System: the Katrin Focal Plane Detectormentioning

confidence: 99%

Solving for Micro- And Macro-Scale Electrostatic Configurations Using the Robin Hood Algorithm

Formaggio¹,

Lazić²,

Corona³

et al. 2012

PIER B

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Abstract-We present a novel technique by which highly-segmented electrostatic configurations can be solved. The Robin Hood method is a matrix-inversion algorithm optimized for solving high density boundary element method (BEM) problems.We illustrate the capabilities of this solver by studying two distinct geometry scales: (a) the electrostatic potential of a large volume beta-detector and (b) the field enhancement present at surface of electrode nano-structures. Geometries with elements numbering in the O(10 5 ) are easily modeled and solved without loss of accuracy. The technique has recently been expanded so as to include dielectrics and magnetic materials.

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Direct search for mass of neutrino and anomaly in the tritium beta-spectrum

Cited by 312 publications

References 9 publications

Mass limits for dark clusters of degenerate fermions

Mass limits for dark clusters of degenerate fermions

Leptogenesis with many neutrinos

Solving for Micro- And Macro-Scale Electrostatic Configurations Using the Robin Hood Algorithm

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