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teddd
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Hi everyone!
Could you explain me how is the dark energy related to the expansion of the universe??
Thanks!
Could you explain me how is the dark energy related to the expansion of the universe??
Thanks!
teddd said:But why the problem of the accelerating universe is addressing to some missing mass? how can we state that? From the einstein field equation?
DaveC426913 said:We don't really know what it is; what we do know is what we observe: that the universe is expanding and accelerating.
Even without knowing anything more about what is causing this expansion, we know it will require energy to do so. Whatever form it takes, we call it Dark Energy.
That's pretty much what I am saying.Dotini said:I'm going to respectfully ask if it isn't just a bit bold to claim that "we know...the universe is expanding and accelerating".
Wouldn't it be wiser and safer to say:
We observe the angular rotation of galaxies and currently prefer dark matter as an explanation.
We observe the redshift of quasars and currently prefer an accelerating universe/dark energy as an explanation.
Whateverworks said:Dark matter and dark energy is something that is completely unaccounted for. As some of you pointed out we can measure that the universe is expanding, and we're pretty sure it's correct, I think it was Edwin Hubble who discovered that galaxy's was moving away from us (our horizon in space is centered on Earth) and galaxy's further away is moving faster away from us while nearby galaxy's is moving with a lesser speed which is very similar to an explosion in this case the big bang. It requires energy for an accelerating expanding universe and we don't understand what it is = dark energy. When we talk about dark matter it is another "thing" where we are completely ignorant of what accounts for it. We don't know if its matter, we know its there because we feel its gravitation so dark gravity might be the right placeholder term until we figure out what it is. Until then dark energy and dark matter could be called Christian and Martin - we have no idea what they are.
/WeW
ibysaiyan said:Dark gravity?
The thing which separates any normal-baryonic matter to dark matter is the fact that 'dark matter' as the name suggests does not influence Electromagnetic radiation at all,gravitation however does influence it. Numerous categories of candidates have been theorized however WIMPS have come out as notable candidates in recent studies.
-ibysaiyan
Dark energy is a hypothetical form of energy that is believed to permeate all of space and contribute to the accelerating expansion of the universe.
The existence of dark energy was first proposed in 1998 when astronomers observed that the expansion of the universe was accelerating rather than slowing down as expected.
Dark energy is thought to be the driving force behind the expansion of the universe. It is believed to counteract the gravitational pull of matter, causing the universe to expand at an accelerating rate.
Dark energy and dark matter are two separate and distinct concepts. Dark matter is believed to be a type of matter that does not emit or absorb light, while dark energy is a form of energy that is responsible for the expansion of the universe.
If dark energy continues to accelerate the expansion of the universe, it is likely that the universe will eventually reach a state of "heat death" where all matter and energy are evenly distributed and there is no more potential for work or life to exist.