Could there exist my-leptons due some cosmic processes in very

If I consider elementary particle reaction:

Electron-neutrino + My-lepton_(-) - electron_(-) + My-lepton-neutrino

This could be reaction for absorption electron-neutrinos in those
cosmic voids?

(In this kind of reaction Electron-neutrino seems=20 to transform
to My-lepton-neutrino.)

(Similar (but not significant in case of these voids) reaction would
also be

My-lepton-neutrino + Tau-lepton_(-) - My-lepton_(-) + Tau-lepton-neutrino

(In this second kind of reaction My-lepton-neutrino seems=20 to
transform to Tau-lepton-neutrino.))

Best Regards,

Hannu Poropudas

Kolam=E4entie 9E
90900 Kiiminki
Finland

[[Mod. note -- Neutrinos will happily go right through an entire star
and out the other side, so I would expect only a *very* tiny fraction
of incident neutrinos to interact in such a manner when passing through
any cosmic region which we can see through (i.e., one through which we
can see "background" galaxies).
-- jt]]

[[Mod. note -- Neutrinos will happily go right through an entire star
and out the other side, so I would expect only a *very* tiny fraction
of incident neutrinos to interact in such a manner when passing through
any cosmic region which we can see through (i.e., one through which we
can see "background" galaxies).
-- jt]]

If a neutrino can change flavor between the sun and earth (inside
a gravity well) can you be so certain that a trip through a Void
wouldn't induce a change?

[[Mod. note -- The relevant physics (see
https://en.wikipedia.org/wiki/Mikhey...enstein_effect
for a brief introduction with references) requires matter to be present.
If you do the numbers, you need a fair bit of matter. "Void" (and the
fact that we can see background galaxies even when our line-of-sight
looks through a void) implies a very low matter density.
-- jt]]