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Replies: 19   Last Post: Feb 11, 2003 9:59 AM

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Daniel Grubb

Posts: 526
Registered: 12/10/04
Posted: Apr 9, 2002 12:49 PM
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>What I'd really like to do is calculate the probability
>that NO particle or atom with a finite half-life would decay
>during the 15 billion years of our universe's time span. When
>you factor in all those elementary particles whose half-lives
>are on the order of 10^(-24) sec, I imagine this will produce
>produce a super-large-in-its-tinyness number. It might even go
>beyond my current record for something of physical significance,
>the 10^(10^166) count of the number of possible universes in an
>(oversimplified) many-universes framework. Does anyone have a
>suggestion on how to estimate something like this? This would
>be an "alternate history" in which there were no atomic bombs,
>no Carbon-14 dating, no (interesting) cloud chamber results,
>no radioactivity, etc. Of course, it's also very likely that
>there'd be no stars, no people, . . .
>Dave L. Renfro

First try:

Do a density calculation of the universe at, say 10^-10 seconds,
get the approximate radius from inflation, use this to estimate
the number of vector bosons (mass around 80GeV), then use the 10^-25
second half-life to estimate your result.

This actually does assume the decay of Higgs particles, as well as some
supersymmetric particles, but it should give an amusing number.

Not much would exist in such a universe--just a mass of undecayed

--Dan Grubb

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