# What made the scientists to think about Antimatter

1. Mar 11, 2006

### mubashirmansoor

I just want to know what made the scientists to think about Antimatter...
And whats the use of it????

2. Mar 11, 2006

### scott1

I'am not to sure there is a modifed veriosn of$E = m c^2$ with $E = - or + m c^2$ I think they created it in particle acceltor's.
There's currently no use for it other then research.It is very expensive and hard to produce and it hard to keep in container.It is possible to use it as power source but not yet if ever.

3. Mar 11, 2006

### AlphaNumeric

Read up on the ideas of Dirac. He's pretty much accrediated with the prediction of antimatter.

4. Mar 11, 2006

### MTyler8

From Wikipedia:

In 1928 Paul Dirac developed a relativistic equation for the electron, now known as the Dirac equation. Curiously, the equation was found to have negative energy solutions in addition to the normal positive ones. This presented a problem, as electrons tend toward the lowest possible energy level; energies of negative infinity are nonsensical. As a way of getting around this, Dirac proposed that the vacuum can be considered a "sea" of negative energy, the Dirac sea. Any electrons would therefore have to sit on top of the sea.

Thinking further, Dirac found that a "hole" in the sea would have a positive charge. At first he thought that this was the proton, but Hermann Weyl pointed out the hole should have the same mass as the electron. The existence of this particle, the positron, was confirmed experimentally in 1932 by Carl D. Anderson.

Today's standard model shows that every particle has an antiparticle, for which each additive quantum number has the negative of the value it has for the normal matter particle. The sign reversal applies only to quantum numbers (properties) which are additive, such as charge, but not to mass, for example. The positron has the opposite charge but the same mass as the electron. An atom of antihydrogen is composed of a negatively-charged antiproton being orbited by a positively-charged positron .

http://en.wikipedia.org/wiki/Antimatter

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