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- From: mcirvin@husc8.harvard.edu (Matt McIrvin)
- Newsgroups: sci.physics
- Subject: Re: Simple Universe Question
- Message-ID: <mcirvin.726859260@husc.harvard.edu>
- Date: 12 Jan 93 17:21:00 GMT
- Article-I.D.: husc.mcirvin.726859260
- References: <12950102@hpspdla.spd.HP.COM> <6690@pdxgate.UUCP>
- Lines: 15
- Nntp-Posting-Host: husc8.harvard.edu
-
- gbshaw@rigel.cs.pdx.edu (Bert Shaw) writes:
-
- ><re "Simple Universe" with only a particle and an anti-particle>
-
- >As I recall, there's no way to have an electron-positron annhilation without a
- >third body to carry off some momentum & energy. (Can't balance all conserved
- >quantities without it.) Isn't that right?
-
- That's right if you want *one* photon at the end of the day-- it can't
- happen unless there's some other body to interact with. An electron and
- a positron can annihilate into two or more photons in free space, however.
-
- --
- Matt McIrvin I read Usenet just for the tab damage!
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