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enricfemi
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it seems the big bang can't explain it
enricfemi said:thank you,keinve.it's really more conciser,but seems havn't explained the acceleration.
pixel01 said:As I have read several articles recently about dark matter. Instead of attracting, the dark matter repels. And darkmatter occupy about 85% of all matter, so it accelarate the expanding of the universe.
keinve said:i could rant for hours on end about this. but i'll put it into a couple lines.
the matter in the universe in not dense enough to at least slow down the universe temporarily. hence, it simply follows the laws of physics, and gets bigger. there's nothing stopping it.
keinve said:i could rant for hours on end about this. but i'll put it into a couple lines.
the matter in the universe in not dense enough to at least slow down the universe temporarily. hence, it simply follows the laws of physics, and gets bigger. there's nothing stopping it.
pixel01 said:As I have read several articles recently about dark matter. Instead of attracting, the dark matter repels. And darkmatter occupy about 85% of all matter, so it accelarate the expanding of the universe.
n4nova said:as far as i know... this expansion of the universe is the result of the big bang explosion.at the beginning , the the explosion occurred & the universe started to xpand from the zero state(ie.infinitely large density n infinitely small volume).till now the universe is xpanding & now the xpansion rate is growing higher and higher...coz..the repulsion force between the elements (ie. stars, planets..etc..) is growing higher. and i should mention here that this repulsion force between them is directly proportional to the distances between them.and now if u r asking the question..."mention the time till when the the universe... will expand..".then i will answer u..."as the universe is xpanding...the density is decreasing...n goinh almost near to 1..when it will reach 1 ,the universe will collapse to a point with an infinite density & after that moment another big bang will occur and a new universe will be created. this process is eternal."...
and at last of all...i want to tell u that... these all theories (given by different scientists) may be proved wrong in futute...coz...no one can say that...this or that theory is completely right,,,, they may change in future.
pixel01 said:Those articles are on space.com about a month or so ago. Even scientists are confused dark matter and dark energy, the two things are linked and influence each other.
Garth said:The cosmological constant, [itex]\Lambda[/itex], acts like a negative pressure with p < [itex] - \rho c^2[/itex].
Distant SNe Ia are fainter than previously expected, which, if they are standard candles, is interpreted as them being further away than expected because the universe's expansion has accelerated.
Therefore it seems this mysterious negative pressure dominates the universe and it has been given the title Dark Energy.
I hope this helps.
Garth
notknowing said:I would like to make a remark about making predictions about the consequence of a cosmological constant on the evolution of the universe, as based on the Einstein field equations. If [itex]\Lambda[/itex] is related to quantum fluctuations (as is often assumed), how can we then rely on predictions using the Einstein field equations when we don't have a satisfactory theory for quantum gravity ? Why should the field equations give the correct answer for an entity for which it was never conceived ?
Rudi Van Nieuwenhove
Garth said:The Cosmological Constant ([itex]\Lambda[/itex]) is a possible component of Einstein's field equation. It serves the function of an integration constant in that its presence does not violate the conservation properties of the Einsteinian tensor with respect to covariant differentiation. It need have no counterpart in quantum physics, it is simply part of how gravity on its own might behave.
[itex]\Lambda[/itex] represents a repulsive force that becomes significant only at large ranges, whereas the normal Newtonian force becomes increasingly significant at shorter ranges. If weak enough [itex]\Lambda[/itex] would be undetectable in the solar system yet dominant at cosmological ranges.
Cosmic acceleration may be evidence of [itex]\Lambda[/itex] having a non-null value.
The zero point energy field, detected only as the weakest of forces, the Casimir force, is something different; although it should behave gravitationally identically to [itex]\Lambda[/itex] and is often confused with it.
Theoretically ZPE is of huge energy density and if it affected gravitational fields it would totally dominate over all else, being OOM 10120 times larger than [itex]\Lambda[/itex].
As you indicate the resolution of this enigma awaits a full quantum gravity theory.
Garth
Probably not with dark matter. Depending on what you mean by "aether" it could have something to do with dark energy. Please define what you mean by aether first.aman malik said:has ether has to do something with dark matter or dark energy??
Hal King said:All normal for human nature. And cosmologists have to recognize that they are human too.
Hal King said:But one must always remember that 'consensus' is NOT the goal -- the science is.
If full consensus were ever reach, scientific investigation would come to a halt.
Hal King said:I guess my problem is the 'labels' people put on the problems in a model. Such as 'dark matter' or 'dark energy'. Such labels carry mental baggage implying that they are a known commodity of existence. In fact, in both cases they are used to describe collections of problems that have been lumped together. Sometimes the only reason for their groupage is that the problems were enountered in a similar timeframe.
Hal King said:This results in any solution not only having to address one problem -- but many others that may be completely unrelated -- even the 'unrelation' has to be 'proved'.
Hal King said:This system of thinking is slowing progress and diverting efforts.
mark2929 said:Dark matter is not understood and like God is used as a fixit for whas unknown What we do know is the universe is expanding faster and the likliest cause is new matter is entering so
1) The big bang is ongoing and creating new matter well time hasnt stopped so it must be.
2) Matter is coming through from another dimension maybe that's what dark matter is? The result of another dimensions black hole coming out this side?
3) We are being pulled towards an outer edge and as we get nearer so its gravity pulls us faster.
4) The equipment for measuring time is faulty or something missed.