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Author (up) Bertolez-Martinez, T.; Esteban, I.; Hajjar, R.; Mena, O.; Salvado, J. url  doi
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  Title Origin of cosmological neutrino mass bounds: background versus perturbations Type Journal Article
  Year 2025 Publication Journal of Cosmology and Astroparticle Physics Abbreviated Journal J. Cosmol. Astropart. Phys.  
  Volume 06 Issue 6 Pages 058 - 37pp  
  Keywords cosmological neutrinos; cosmological parameters from CMBR; neutrino masses from cosmology; neutrino properties  
  Abstract The cosmological upper bound on the total neutrino mass is the dominant limit on this fundamental parameter. Recent observations soon to be improved have strongly tightened it, approaching the lower limit set by oscillation data. Understanding its physical origin, robustness, and model-independence becomes pressing. Here, we explicitly separate for the first time the two distinct cosmological neutrino-mass effects: the impact on background evolution, related to the energy in neutrino masses; and the “kinematic” impact on perturbations, related to neutrino free-streaming. We scrutinize how they affect CMB anisotropies, introducing two effective masses enclosing background ( mBackg. nu ) and perturbations ( mPert. nu) effects. We analyze CMB data, finding that the neutrino-mass bound is mostly a background measurement, i.e., how the neutrino energy density evolves with time. The bound on the “kinematic” variable mPert. nu is largely relaxed, mPert. nu <0.8 eV. This work thus adds clarity to the physical origin of the cosmological neutrino-mass bound, which is mostly a measurement of the neutrino equation of state, providing also hints to evade such a bound.  
  Address [Bertolez-Martinez, Toni; Salvado, Jordi] Univ Barcelona, Dept Fis Quant & Astrofis, Diagonal 647, E-08028 Barcelona, Spain, Email: antoni.bertolez@fqa.ub.edu;  
  Corporate Author Thesis  
  Publisher IOP Publishing Ltd Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1475-7516 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:001522131000002 Approved no  
  Is ISI yes International Collaboration no  
  Call Number IFIC @ pastor @ Serial 6737  
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