Antimatter Definition and 286 Threads

I've been reading posts (already existing) about antimatter and someone wrote "Matter/antimatter collisions, appear to me, to violate the Law of conservation of matter and energy". I've learned from the answers and understand - its not true. I think now,that antimatter may be considered as...

Prodution and storage of antimatter seems to be a hard task. The latter is of course because antimatter is annihilated when it makes contact with regular matter. Still, wouldn't it be possible to create \overline{^3He}^- ions and store these in a metal container which has a lot of negative...

In http://arxiv.org/abs/0908.1803v1" , 2003, Robert Frisbee offers some ideas on the design of an antimatter rocket. Crane and Westmoreland concentrate more on the possibility of a black hole starship, rather than the size or shape of the craft. I'm wondering, how many of the constraints that...

what is the difference between antimatter sun and a matter one, thanks.

Hey all, First post so I should introduce myself. I'm a freshman physics+math major at Virginia Tech, probably headed towards particle physics. I do some undergrad research w/ one of my professors, pretty lame though as I only build photomultipliers, but nontheless my foot's in the door...

In penning traps ,the small quantities of antimatter that has been synthesized on earth, is suspended by magnetism and optical "tweezers", i have read that there are two radiation belts ,possibly 3, that surround Earth (the Van allen belts), I'm wondering to if antimatter can be suspended in...

the idea for an Antimatter catalyst engine is probably my favorite idea of any propulsion that can be easily attained by a type I civilization. We're a type 0.78 civilization and to build an antimatter beam core engine (an antimatter engine that has a 1:1 matter/antimatter anhialation drive)...

I'm watching a video on Youtube entitled "Angels and Demons - The Science Revealed" in which the topic of discussion is antimatter. During this video, the lecturer (from Berkeley) mentions that there are some who believe that antimatter would be repelled by the gravity produced by matter (in the...

12 August 2009 My question relates to the search for antimatter in the cosmic space. As far as many laymen know, the composition of the material ingredients of galaxies is detected through spectroscopic analysis (i.e. through the analysis of the electromagnetic waves emitted). Considering...

How does antimatter interact with massive matter through gravity. Does it still attract? I know most antiparticles are stored using electromagnetic fields so we wouldn't see the effect of gravity, but have we ever just let one loose and seen if it falls to the earth?

2 photons with energies of at least 0.511 MeV are crossing the same spot at the same time - there is 1.22 MeV energy in a point, enough to create electron and positron pair. Will it happen? If yes, isn't it a nice way to create antimatter, or at least anti-electrons? If it doesn't, then...

what happens to anti matter traveling the speed of light?

We know it is implausible that the local observable universe contains a near-balanced distribution of matter and antimatter because we fail to observe predicted anomalies of high-energy radiation brought about by spontaneous annihilation from matter-antimatter collisions on the borders of such...

In many websites I read that antimatter has antigravity properties. Does negative mass exist. Does antimatter react differently with gravity.

As matter & antimatter are equally created in the early universe , then why matter dominated over antimatter. Please suggest any possible answer

Can there be stars and planets made out of antimatter?

My friend sent me a picture of an equation that has something to do with antimatter. http://static1.web.cern.ch/static1/ad/images/antimatter/dirac_equation.jpg Can someone please tell me what the equation and everything in it means? Thank you very much!

wats the cause of the slight preponderance of matter on antimatter at the beginning of times,(big bang primordial soup) any relevant theory or explications? thanks

Hey. I was wondering, can we 'see' antimatter? By this, I mean, does a positron ever emit photons, or can we shine a light on antimatter and see what it gives off? Are we limited to 'seeing' antimatter by other means, such as annhilation, or charge? From my understanding, antimatter...

Hi. I was wondering, as I never really knew for certain, does antimatter have positive or negative relativistic energy?

Antimatter excotic particle or another reality? Is it a mirror of matter or just another form of matter?

anyone know what research is being done in CP symmetry violations and Matter Antimatter Asymmetry currently?

Well, it has been ~ four years ago now I request help with this question in another thread, long dead, so I thought I would bring it to forum again in updated form: So, my question is: Does anyone know the mathematics that would explain the quantum dynamics of how a matter helium-3...

In Antimatter production in a labratory, does anyone know the principle element used to generate antimatter such as anti-protons?

I posted this question in the general physics section and the physics part has been answered somewhat. However the cosmological components remain un-answered. Would someone be kind enough to comment on those aspects please? Here is the question; Matter and Antimatter, I have always...

Matter and Antimatter, I have always wondered what happens with regard to the gravitational field when matter and antimatter annihilate each other. Consensus among physicists is that matter and antimatter behave the same as far as gravitational potential is concerned, i.e., both will...

This is hypothetical because I know that we do not have the ability to create or store antimatter. The tsar Bomb had a yeild of 50 megatons is it true that a bomb made of 1 kg of antimatter and 1kg of matter could yeild around the same (42 Mt)? If this could be achieved would this be...

If photons are their own antimatter, then why don't they just annihilate? Also, do neutrons have antimatter, or is it themselves?

Hi, I don't think I understand why antimatter annihilates when it touches matter, should I picture has it as if it was a wave that canceled an other one? Or is it something else entirely? Thanks.

I've written a SF story where a twenty million ton metallic asteroid is moved by antimatter propulsion. Apparently antimatter engines emit gamma rays. At the moment I'm planning to stick to pure antiproton annihilation 'cause it's easier to explain (so not a hybrid engine). For plot purposes...

Today my physics teacher said that "A matter particle going forwards in time is sort of like an antimatter particle going backwards in time." What did he mean by "sort of"?

As I understand it, a beamed core antimatter drive would produce thrust by annihilating matter and antimatter and ejecting the results of the annihliation via a magnetic nozzle. The usable results would be charged pions, which would decay into muons, correct? So my question is, if a...

From what I've seen, the possibility of matter-antimatter to mutually repel each other is ruled out, but, can the following hypothesis be ruled out? : Gravity --> A property of matter & antimatter (not of mass) Matter gravity --> A "force" that pulls "everything" Antimatter gravity --> A...

One of us, Oldman, had a suggestion recently that relates to the puzzle about the scarcity of antimatter. He mentioned the book by Helen Quinn and Yossi Nir. I haven't read this book so I can't recommend it, but I will pass along the tip. It is a popular-written book. Witty title, cute...

I have recently been reading Moment of Creation by James Trefil, and I have stumbled upon the question, where has all the antimatter gone? I asked myself, what if micro black holes produced by the tremendous energy at the big bang are the answer? If you have an understanding in hawking radiation...

I have recently been reading Moment of Creation by James Trefil, and I have stumbled upon the question, where has all the antimatter gone? I asked myself, what if micro black holes produced by the tremendous energy at the big bang are the answer? If you have an understanding in hawking radiation...

if an electron going forwards in time generates/is equivalent to a positron going backwards in time, would matter going backwards in time leave antimatter in its place (going forwards in time)? thanks

Is antimatter a theory or does it exist?? Does antimatter really exist?? if so, what is it made of, if not matter?? and is it subject to the same laws as normal matter?? i personally can't see how it is possible. in another thread i read that in a void where there is nothing it is possible for...

How would the higgs field affect antimatter as appose to matter. Would it give antimatter mass in the same way as it does to matter, or in a different way? Could this "different way" explain why antiparticles and particles annihilate when they meet? Thanks, Jamie

Can someone please explain me with what and how antimatter is created. thanks!

Do black holes convert matter to antimatter? How does antimatter come into 'existence' within a particle accelerator?

i wat to pursue a career in research about antimatter. i am in second year of high school.

I heard once somewhere that in the early days of the universe there was equal amounts of what we call matter and antimatter. What confuses me a lot is how come pair annihilation didn't occur between all the matter and antimatter to produce a universe just filled with gamma rays? And how come...

Can anyone point to the current state of research about the relationship between antimatter clouds and gamma rays, specifically gamma ray bursts? There was a science.com article quoted in a Yahoo news story. If anyone has read the article, does it say anything pertinent on this question?

SPACE.com: "Source of Mysterious Antimatter Found" http://news.yahoo.com/s/space/20080111/sc_space/sourceofmysteriousantimatterfound

I know that we can only create small amounts of antimatter. But, suppose that we could create lots and lots of antimatter and we kept sending it into space to some empty place far away from our solar system. We keep sending antimatter to the same spot until the mass is enough for it to collapse...

Hello, assuming we can detect antimatter with some telescopic technique just like we can detect matter, is there any way to tell them apart? How would this be done?

opposites.. Matter/ Antimatter proton/ positron electron/photon is that right? So can you tell me there properties? ' thanks

What percent of baryonic matter is antimatter? I am well aware that DM accounts for most "matter" and that there was baryon number violation and cp violation to explain the presence of matter over antimatter, but based on theory and observation, what percent of visible matter is predicted or...

I am having some trouble on the following problem, can someone help me? Any help is greatly appreciated!:smile: 1) A spaceship has a mass of 20000kg. It has a matter-anti-matter engine which can transform the annihilation energy into kinetic energy of the spaceship with an efficiency of...