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Message: <blockquote data-quote="freyar" data-source="post: 6688909" data-attributes="member: 40227">Yes, though right now we don't know if sterile neutrinos exist. <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f609.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=";)" title="Wink    ;)"  data-smilie="2"data-shortname=";)" />Not FTL --- neutinos travel at light speed --- but for SETI a neutrino telescope has an advantage that one detector can see in all directions, since neutrinos pass right through the earth.  Or an advanced civilization could use a neutrino beam to communicate through a nebula or something.  The real advantage of neutrino communication is that they can pass through matter, so you could for example communicate with Australia or China from the US without bouncing the signal off a satellite.  I looked into it, and people seem a bit excited about the possibility for communication with submarines. It would be very low bandwidth, but submarines already have low bandwidth communications since they have to use extremely low frequency electromagnetic waves that can't be modulated quickly (radio waves can't penetrate water).Remember that antimatter particles interact the same was as the corresponding matter particles but with opposite charge.  So positrons -- anti-electrons -- interact by electromagnetism just as strongly as electrons do.  Also, I might have been a bit confusing in my first post: sterile neutrinos would be some whole new type of particle, not antineutrinos (the antiparticles of neutrinos).  We have lots of observations of antineutrinos.  You also seem to be thinking about why sterile neutrinos don't feel the electromagnetic, strong, or weak forces.  One answer is that they just don't.  Of course, there are highly speculative theories that give reasons, like maybe most matter is at one place in extra dimensions and sterile neutrinos are somewhere else.  It's not "quantum phase" like sometimes messes up people in Star Trek, but it is kind of out there.What Umbran said. <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f600.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":D" title="Big grin    :D"  data-smilie="8"data-shortname=":D" /></blockquote>

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