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Are they pretty sure it’s different than antimatter? Last I heard we weren’t sure if it has negative gravity or not.
by mrfusion 8y ago
Are they pretty sure it’s different than antimatter? Last I heard we weren’t sure if it has negative gravity or not.
- shepardrtc 8y agoMatter-antimatter annihilation would produce gamma rays that are detectable. I believe there was a study that went looking for that but didn't find anything.
- AnimalMuppet 8y agoTo clarify (presuming I understand correctly): Antimatter might have negative gravity, but dark matter can't be antimatter, because we'd see the gamma rays from the collisions.
- mrfusion 8y agoBut if they’re repelling each other and for billions Of years. Why should there be any collisions?
- AnimalMuppet 8y agoBecause it's still in places where there's interstellar gas (if this theory is right). And repelling each other gravitationally doesn't work very well at the molecular level.
- DonHopkins 8y agoMaybe there's a matter/antimatter Leidenfrost effect? https://en.wikipedia.org/wiki/Leidenfrost_effect https://en.wikipedia.org/wiki/Leidenfrost_effect
- Pxtl 8y agoIf it's antimatter why isn't it coalesced into antigalaxies that we would be able to see visibly, and is instead diffused as a dark fluid?
- excalibur 8y agoIt is, we can't see them because they emit dark energy "light". /s
- garmaine 8y agoWe would see gamma radiation producing events at the interaction interface, even if it is just interstellar gas occasionally colliding. Not to mention the occasional universe bleaching bursts of energy that comes from an antimatter galaxy colliding with a regular matter galaxy.
- deleted 8y ago[deleted]
- delecti 8y agoI know you put the "/s", but in case anyone isn't aware, as far as we know the photon is its own anti-particle. So light from anti-matter stars would still just be light.
- Filligree 8y agoGiven the spacetime interval between photon creation and destruction is always zero, I'd find it moderately bizarre if there was an antimatter version of them.
- mrfusion 8y agoThey could repel each other gravitationally too. Seems like that’s how antigravity would would work. I don’t even think we know that about antimatter yet.
- d--b 8y agoThis is being tested at CERN: https://cerncourier.com/does-antimatter-fall-up/ https://cerncourier.com/does-antimatter-fall-up/