000136364 001__ 136364 000136364 005__ 20240731105612.0 000136364 0247_ $$2doi$$a10.1103/PhysRevD.110.023510 000136364 0248_ $$2sideral$$a139270 000136364 037__ $$aART-2024-139270 000136364 041__ $$aeng 000136364 100__ $$aCarenza, Pierluca 000136364 245__ $$aStrong cosmological constraints on the neutrino magnetic moment 000136364 260__ $$c2024 000136364 5060_ $$aAccess copy available to the general public$$fUnrestricted 000136364 5203_ $$aA sizable magnetic moment for neutrinos would be evidence of exotic physics. In the early Universe, left-handed neutrinos with a magnetic moment would interact with electromagnetic fields in the primordial plasma, flipping their helicity and producing a population of right-handed (RH) neutrinos. In this work, we present a new calculation of the production rate of RH neutrinos in a multicomponent primordial plasma and quantify their contribution to the total energy density of relativistic species at early times, stressing the implications of the dependence on the initial time for production. We find that current cosmological data exclude values of the magnetic moment μ≳1.6×10−11μB, while future cosmological experiments will be able to probe nonthermal production of RH neutrinos, becoming competitive with stellar limits. 000136364 540__ $$9info:eu-repo/semantics/openAccess$$aAll rights reserved$$uhttp://www.europeana.eu/rights/rr-f/ 000136364 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion 000136364 700__ $$aLucente, Giuseppe 000136364 700__ $$aGerbino, Martina 000136364 700__ $$aGiannotti, Maurizio$$uUniversidad de Zaragoza 000136364 700__ $$aLattanzi, Massimiliano 000136364 7102_ $$12004$$2038$$aUniversidad de Zaragoza$$bDpto. Física Teórica$$cÁrea Astronomía y Astrofísica 000136364 773__ $$g110, 2 (2024), 023510 [11 pp.]$$pPhys. rev. D$$tPhysical Review D$$x2470-0010 000136364 8564_ $$s858598$$uhttps://zaguan.unizar.es/record/136364/files/texto_completo.pdf$$yVersión publicada 000136364 8564_ $$s2591782$$uhttps://zaguan.unizar.es/record/136364/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada 000136364 909CO $$ooai:zaguan.unizar.es:136364$$particulos$$pdriver 000136364 951__ $$a2024-07-31-09:23:46 000136364 980__ $$aARTICLE