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We examine the effect of excited neutrinos on the annihilation of relicneutrinos with ultra high energy cosmic neutrinos for the $\nu \bar{\nu}\to\gamma\gamma$ process. The contribution of the excited neutrinos to theneutrino-photon decoupling temperature are calculated. We see thatphoton-neutrino decoupling temperature can be significantly reduced below theobtained value of the Standard Model with the impact of excited neutrinos.

The impact of excited neutrinos on $\nu \bar{\nu}\to \gamma\gamma$ process