2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/47618In the framework of the supersymmetric theories with R-parity violation we consider the process $γγ\to ν_i \bar{ν_j}$ and its contribution into energy loss from the stars.Under some conditions the studied contribution exceeds the standard model contribution to the same process.5 pages, LaTeX file, using eps.sty, 1 ps figures includedHigh Energy Physics - Phenomenologytext