Re: A little matter of anti-matter
Does anti matter exist in nature?
@Southie, don’t know if the other cheese is anti cheese or not, but both will eventually end up being the same thing at the end.
@chapter_2, come again!
@Iconoclast, good question. Theoretically, there should be, but no one has observed it yet. In fact there is another theory which talks about why we don’t have anti matter in nature present. More on that later, just because it’s going to be a long answer and I am using phone app which is pretty irritating when it comes to long posts
Re: A little matter of anti-matter
May have been addressed before - but memory fails me. Is anti matter same as dark matter. I would think not. Since most of universe is dark matter?
Re: A little matter of anti-matter
Southie, anti-matter is not dark matter. Dark matter is supposedly regular matter, but it does not interact with anything, and light does not bounce off it, hence undetectable. Only way it could be detected is if hits another particle, in which case, a photon would emit, making the presence of the dark matter particle known.
The best contestant of dark matter is neutrino. Neutrinos are subatomic particles, and have no charge. Because of that, they can travel through solid bodies without any interaction. To put it in perspective, every second, trillions of neutrinos are passing through your body.
Re: A little matter of anti-matter
So neutrinos are the closest to dark matter?
Re: A little matter of anti-matter
Yes, they are the best candidate, though its not proven yet that they are indeed the cause of galaxies bonded together in cluster form, or not. Dark matter is the one responsible for the bond that galaxies have between them in a cluster.
Re: A little matter of anti-matter
Dark matter includes things like black holes and other massive entities that do not give off electromagnetic energy - they may have gravitation and their effects are observed by studying the behaviour of non-dark matter to account for peculiarities of their observed effects.
I find it interesting how in modern science particle physics is being used to attempt explain phenomena that exists several orders of magnitude larger ... cluster level physics and subatomic physics are at the extreme opposite ends of natural phenomena.
But anyway ... I believe neutrinos were a candidates for dark matter in the 80's, but that is discredited due to their travelling fast making them hot ... which would imply even spread not the clustering we observe and the sluggish dark matter out there ... rather we should not conflate or confuse the neutrino with the conceptual neutralino ... the latter has not been observed, but the former has been observed. Neutralinos are super symmetry necessities and it is they that latest theory states are one of that major constituents of dark matter.
Anti-matter does exist in nature ... e.g. beta decay ... either (electron plus electron antineutrino) or (positron plus electron neutrino), called negative or positive decay respectively. Talking cosmologically ... stable antimatter in large amounts is what has not been observed yet
^ I think I seriously need to catch up on my reading. I did not know that neutrinos are no longer a candidate is dark matter 
Re: A little matter of anti-matter
Why should I come again? :)