Date: Fri, 2 Dec 2005 14:21:24 -0000 X-Mailer: YahELite Content-Type: text/plain; charset=ISO-8859-1
Are there any blue shifting phenomena out there?
ejected gas from quasars are believed to be blue shifted because it approches us at a very high speed.
There are two known reasons for the blue color observed in energetic objects in space: an high electrical stress, and a speed movement in our direction caused by doppler effect.
I am wondering how it could be possible with peedee to make a simulation of our universe model.
patco.
Actually, my approach to the expansion of the universe is very simple:
[metro 1000] | [bang]
[metro 1010] | [bang]
and you have infinite expansion.
On 3.12.2005, at 23:31, a wrote:
megalegoland@yahoo.fr said :
I am wondering how it could be possible with peedee to make a
simulation of our universe model.[bang( | [print]
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On Fri, 2 Dec 2005, megalegoland@yahoo.fr wrote:
There are two known reasons for the blue color observed in energetic objects in space: an high electrical stress, and a speed movement in our direction caused by doppler effect.
Well, I don't know about the electrical stress, but... there's another (major) source of blue: very-high-temperature objects, such as big young stars, have an incandescence spectrum centred in the blue shades.
I am wondering how it could be possible with peedee to make a simulation of our universe model.
Depends to which degree of precision you want to do it, and especially, which aspects of it you want to reproduce and emphasize, and then, how you would visualise or sonorise it. Any ideas?
If you're into physical particle systems, Cyrille & Damien Henry have a
mass/spring plugin, which was called PMPD when I saw their performance.
Else, GridFlow could do things like that too, but it can also do density
models, which are more like "we have the space and then there's matter in
it" whereas particle systems are more like "we have matter and then it's
somewhere in space".
Mathieu Bouchard - tél:+1.514.383.3801 - http://artengine.ca/matju Freelance Digital Arts Engineer, Montréal QC Canada
If you're into physical particle systems, Cyrille & Damien Henry have a
mass/spring plugin, which was called PMPD when I saw their performance.
Else, GridFlow could do things like that too, but it can also do density
models, which are more like "we have the space and then there's matter in
it" whereas particle systems are more like "we have matter and then it's
somewhere in space".
PMPD would be a good tool for exploring gravity - but you would have to explore the escape velocity scenario, where links (springs) are broken if an object attains a certain angular momentum, and a different (repulsive) mechanism comes into effect (and what about dark matter/energy or as it should be termed, the foo fudge factor (FooFF)).
Also - how fast is your computer? They normally use supercomputers to do this, I think you may have problems on a standard machine. Modelling aspects of the universe such as doppler shift would be easy, but it's a problem of scale...perhaps you ahould start with a solar system?
Best, Ed
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On Sun, 4 Dec 2005, Ed Kelly wrote:
PMPD would be a good tool for exploring gravity - but you would have to explore the escape velocity scenario, where links (springs) are broken if an object attains a certain angular momentum, and a different (repulsive) mechanism comes into effect
It wouldn't be a good model because the ideal spring force is proportional to distance, whereas gravitational force is inversely proportional to the square of the distance when assuming pointlike masses.
The only case where gravitational force is sort of (sort of!) like spring force is if you go inside a large object of uniform density. obviously you don't have orbits inside there.
Going over escape velocity does not change the nature of gravitation and doesn't cause repulsion. Escape velocity is a natural consequence of the inverse-square force (gravity or electricity).
The repulsion you are thinking of may be caused by centrifugal force, which only appears when the observer (the referential) is rotating.
Gravity works beyond escape velocity. It's just that beyond escape velocity, it isn't dominant anymore. To compute gravity, you need to take *all* of the possible particle pairs into account, so for N masses you need N*(N-1)/2 springs, all of the time.
_ _ __ ___ _____ ________ _____________ _____________________ ... | Mathieu Bouchard - tél:+1.514.383.3801 - http://artengine.ca/matju | Freelance Digital Arts Engineer, Montréal QC Canada
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Ed Kelly -
Mathieu Bouchard -
megalegoland＠yahoo.fr -
Pall Thayer