quantumdream Posted September 19, 2002 Share Posted September 19, 2002 In a statistically mechanical intergalactic space with (noninteracting) hydrogen atoms of average density 10^-5 atom/cm^3, with age 10^17 seconds, radius 10^28 cm, and temperature 3 K, what is the maximum radius void of matter to have existed given those spacetime parameters? That is, create a random walk model to describe the maximal absolute void volume that classical intergalactic spacetime has ever allowed. Link to comment Share on other sites More sharing options...
fafalone Posted September 20, 2002 Share Posted September 20, 2002 Let me consult with a physics professor and get back to ya on that one Link to comment Share on other sites More sharing options...
Radical Edward Posted September 20, 2002 Share Posted September 20, 2002 (4/3) x pi x (10^26)^3 Link to comment Share on other sites More sharing options...
blike Posted September 20, 2002 Share Posted September 20, 2002 Hrm, I'm wondering if you just baffled me with bs. Link to comment Share on other sites More sharing options...
quantumdream Posted September 20, 2002 Author Share Posted September 20, 2002 Radical, my guess is more on the scale of ~centimeter or ~meter. Link to comment Share on other sites More sharing options...
aman Posted September 20, 2002 Share Posted September 20, 2002 Is this a statistical avg. ans.? I never was good at statistics and since I like Las Vegas, I guess I don't believe in them. Just aman Link to comment Share on other sites More sharing options...
quantumdream Posted September 20, 2002 Author Share Posted September 20, 2002 Yes, averaged over the given age and radius. Link to comment Share on other sites More sharing options...
dragoon Posted September 23, 2002 Share Posted September 23, 2002 You are asking what the maximum is, but you are saying thats what the they have to be... why dont you just take the radius and develope it into a spherical shape (??).... something like radical edward did. or am i looking at all this the wrong way. Link to comment Share on other sites More sharing options...
Radical Edward Posted September 26, 2002 Share Posted September 26, 2002 Originally posted by quantumdream Radical, my guess is more on the scale of ~centimeter or ~meter. they might have all decayed into energy. leaving absolutely no atoms. you never know. Link to comment Share on other sites More sharing options...
quantumdream Posted September 26, 2002 Author Share Posted September 26, 2002 When was the last time that the Earth's atmophere (even a few atoms of it) decayed into energy? Proton (hydrogen ion) halflife is greater than 1000 times the age of the universe! Link to comment Share on other sites More sharing options...
fafalone Posted September 26, 2002 Share Posted September 26, 2002 matter anti-matter collisions. Link to comment Share on other sites More sharing options...
Radical Edward Posted September 27, 2002 Share Posted September 27, 2002 the half life is only a statistical thing though. Every uranium atom on the planet could simultaneously decay tomorrow at 2:55pm. The probability of it happening is vanishingly small, but still finite. Link to comment Share on other sites More sharing options...
aman Posted September 28, 2002 Share Posted September 28, 2002 Even if you calculate a number of hydrogen atoms over an area at a temperature, it's a moot calculation since physics seems to point to a Higgs boson particle or field that is in all space. That is what CERN is looking for now. There is no true void according to physics right now. Something gives particles mass and something keeps the space we experience stable. A void would have to be a lot smaller than the universe of the Higgs boson. Just aman Link to comment Share on other sites More sharing options...
quantumdream Posted October 1, 2002 Author Share Posted October 1, 2002 I should have said "void of baryonic matter" (not to consider neutrinos, other WIMPs, or exotic particles). By classical, I mean non-virtual as well. The percentage of hydrogen decaying in intergalactic space is negligible for this problem. Link to comment Share on other sites More sharing options...
Radical Edward Posted October 1, 2002 Share Posted October 1, 2002 okay, well they could all get to the same place, giving the same answer if they're non-interacting. Though the probability would be negligably small, as is the probability of them all decaying, the proability is still finite. Link to comment Share on other sites More sharing options...
quantumdream Posted October 1, 2002 Author Share Posted October 1, 2002 One more time, create a random walk model to describe the maximal absolute void volume that classical intergalactic spacetime has ever allowed.Brush up on your random walk! Link to comment Share on other sites More sharing options...
fafalone Posted October 2, 2002 Share Posted October 2, 2002 Why would there be a limit, if you consider the area the lies beyond the fartest point matter created in the big bang has moved from the point of origin? Link to comment Share on other sites More sharing options...
quantumdream Posted October 3, 2002 Author Share Posted October 3, 2002 The parameters I gave define the observable universe, whose age, dimensions and temperature closely outline current hydrogen populated intergalactic space. Link to comment Share on other sites More sharing options...
quantumdream Posted October 3, 2002 Author Share Posted October 3, 2002 The parameters I gave define the observable universe, whose age and dimensions closely outline current hydrogen populated intergalactic space. Link to comment Share on other sites More sharing options...
Radical Edward Posted October 3, 2002 Share Posted October 3, 2002 Originally posted by quantumdream One more time, Brush up on your random walk! what's the point? it would just spit out the same answer I gave. If you're looking for an average on the other hand..... Link to comment Share on other sites More sharing options...
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