What is Dark Energy

[Time_Travel]

Possibly there is no dark energy?

 

Three cosmic enigmas, one audacious answer - physics-math - 09 March 2006 - New Scientist

 

If there is no dark energy what is causing the expansion accelerate?

 

 

 

Light bends if it travels in the vicinity of massive object in space.

Doesn't it take more time to reach us since it has to bend around the object and then reach us? Or is LIGHT STILL CONSTANTLY TRAVELLING at 300,000 Km/hr? If the former is true then there would be no dark energy . And if the latter is true then......?

Am i missing something?

[Time_Travel]

Does Universe Expand at the same rate everywhere

[gubbyrichie]

As I understand it, from a lecture at the Cheltenham Science Festival, the stars and galaxies we see make up about 4% of the matter that calculations show should make up our universe. The speed at which galaxies revolve around their own axes should mean that stars at the out edge should be thrown out of the galaxy but something is preventing that. That is dark matter which exists around galaxies. The rate at which galaxies are moving apart and therefore the rate at which the universe is expanding is accelerating, dark energy is the force between galaxies that makes that happen. The mysterious thing is that this energy can be measured, by what unit I have forgotten, but whatever it is it remains constant. One might think that as the universe expands it would increase. Does this make any sense to anyone, am I on the right track? gubbyrichie

[Time_Travel]

If dark energy is expanding the Universe, what is giving the dark energy the energy to do that?

[Time_Travel]

Dark energy is the least understood cosmological energy.

If dark energy is expanding and accelerating the universe what is gives the dark energy the energy to do so? It simply can't expand without converting some other form energy to dark energy. Or is Dark Energy violating the first law of thermodynamics::"Energy can be neither created nor destroyed. It only changes form".

If it is not violating the first law of Thermodynamics then from what form it changes to Dark energy, it simply can't expand without converting some sort of energy to expand.

[gubbyrichie]

The replies you have received already are a lot more informed than my offering. I went to a presentation on Dark Matter and Dark Energy at a science fair recently. I was fascinated by two things about Dark Energy, one is that it is measurable, and I have forgotten what the unit of measurement is, second is that it is apparently the force that makes the universe expand while at the same time remains a constant. I assume that the measurement remains the same. It is not understood. According to the presenter, "visible" matter in the universe only accounts for about 4% of the total matter in it, dark matter, which surrounds galaxies, accounts for, I guess, about 25% and dark energy for 70%. So we don't know what comprises most of our universe. I understood that some from of string theory is seen to offer the most promising avenue for understanding what it is. Given that this kind of thing postulates the existence of other universes, I find that quite exciting. Apologies if there are errors in this but I expect someone will point them out.

[Time_Travel]

The replies you have received already are a lot more informed than my offering.....

 

May be you are right. Nobody knows the answers for this question and that was one of the answer posted previously.

Should not have asked about it again.

 

one is that it is measurable, and I have forgotten what the unit of measurement is....

 

Well i remember the physical measurement :: Dark Energy is having a density 10^(-29) grams per cubic centimeter .

Edited August 9, 2010 by Time_Travel

[Rade]

If gravity is the condition where objects attract, then antigravity is the condition where objects repel. If matter is the positive energy solution of the Dirac equation, then antimatter is the negative energy solution. Thus, if you combine the contrary concepts of gravity and antigravity (which associate with spacetime) with the contrary concepts of positive energy and negative energy (which associate with matter), it is my hypothesis that you will find the solution to the question "what is dark energy". I mean, if we use the term "dark energy" for a concept, logically this must be the contrary of another term we can label "light energy" for a mirror concept.

 

So, let us assume "light" energy (what we observe directly in the universe) follows laws of gravity and positive energy solution of the Dirac equation, and "dark" energy (what we cannot observe directly) follows laws of antigravity and negative energy solution of the Dirac equation. Then, the universe we observe could be a stable superposition of the two types of energy (light & dark) such that the dark energy is in a form of hidden or virtual reality of the stable superposition. This is how I see it, please let me know where I error in my thinking.

[enorbet2]

If dark energy is expanding the Universe, what is giving the dark energy the energy to do that?

 

Obviously this is a highly speculative area since the one area where there is agreement is that this quantifiable "something" exists. I seem to recall some proposing that DE is not separate but a fundamental property of spacetime itself. This way no separate thing is giving Dark Energy the energy since it is and always has been here just in different form under different conditions.

 

Gravity and Planck Scale energies are likely involved here. Gravity is a hotly contested area right now with the various Quantum Gravity flavors and proponents and only recently has experimentation even begun to extend into Planck Scale, it is probably going to take CERN LHC or FermiLab results to make any real headway that is based in experiment rather than pure mathematics like the String/M-Theory boys.

 

Those guys seem to think that this is merely a cyclical natural process where Big Bangs expand until Universes flatten into membranes, ultimately striking other membranes, creating newer Big Bangs, wash, rinse and repeat. That's too speculative for me but then my Math skills fall short of M-Theory.

 

If you'd enjoy some essays on such matters here are three arranged from light to heavy.

 

 

Toward Quantum Gravity? Discrete Space, Dark Energy And the Real Line : 13.7: Cosmos And Culture : NPR

 

planck

 

and the heavier but more to the point

 

Dark Energy and the Preposterous Universe - S.M. Carroll

 

It's way too soon for deep conclusions but it surely is fascinating to ponder! It should be stimulating to realize that a scientist paralleled eight PS-3 gaming consoles at a cost of around $300 US each creating a supercomputer capable of calculating gravity waves around Black Holes. Just five years ago that level of computing power would have cost in excess of $25,000.00. Such ability to crunch such massive amounts of data at such a low cost is an absolute breakthrough, a quantum leap, if you will in the ability to resolve some of these questions.

 

What a great time to be alive!

[Time_Travel]

If gravity is the condition where objects attract, then antigravity is the condition where objects repel. If matter is the positive energy solution of the Dirac equation, then antimatter is the negative energy solution. Thus, if you combine the contrary concepts of gravity and antigravity (which associate with spacetime) with the contrary concepts of positive energy and negative energy (which associate with matter), it is my hypothesis that you will find the solution to the question "what is dark energy". I mean, if we use the term "dark energy" for a concept, logically this must be the contrary of another term we can label "light energy" for a mirror concept.

 

So, let us assume "light" energy (what we observe directly in the universe) follows laws of gravity and positive energy solution of the Dirac equation, and "dark" energy (what we cannot observe directly) follows laws of antigravity and negative energy solution of the Dirac equation. Then, the universe we observe could be a stable superposition of the two types of energy (light & dark) such that the dark energy is in a form of hidden or virtual reality of the stable superposition. This is how I see it, please let me know where I error in my thinking.

 

Dirac's Equation applies specifically for elementary 1/2 spin particles such as electrons. Don't think they apply to dark energy .

[Rade]

Dirac's Equation applies specifically for elementary 1/2 spin particles such as electrons. Don't think they apply to dark energy .

OK, thanks, but, other 1/2 spin particles such as protons and neutrons can be applied to the Dirac equation, in modified form.

 

Also, has this paper been discussed yet ?---it relates dark energy to bosons such as photons:

 

http://arxiv.org/PS_cache/astro-ph/pdf/0703/0703364v2.pdf

[Atlas shrugged]

Multiple Universes may exist in different ways and have been called Parrallel Universes in other types of situations.

 

My question though is, let's say there are mundane neighboring garden variety universes for disscusion sake ,

They would have influences on each other just as inside our Universe the different bodies IE: galaxies , black holes ,stars, planets, have effect on each other.

 

Could those neighboring universes be what, where, dark matter and dark energy is coming from ?

 

And our attempts to find a new particle to explain it may never be possible.

It may only be invisible because we cannot see beyond our own Universe.

[modest]

Multiple Universes may exist in different ways and have been called Parrallel Universes in other types of situations.

 

My question though is, let's say there are mundane neighboring garden variety universes for disscusion sake ,

They would have influences on each other just as inside our Universe the different bodies IE: galaxies , black holes ,stars, planets, have effect on each other.

 

Could those neighboring universes be what, where, dark matter and dark energy is coming from ?

 

And our attempts to find a new particle to explain it may never be possible.

It may only be invisible because we cannot see beyond our own Universe.

 

Dark matter must be lumped around regular matter (for example: dark matter halos around galaxies). It is therefore not something that can neighbor our universe (whatever that might mean), but must be something in our universe—sprinkled throughout it.

 

~modest

[Atlas shrugged]

Well just that as we did not recognize until just recently that we are in one galaxy out of billions , we are probably in one Universe out of billions as well.

It only stands to reason when you use the examples all around us.

 

It has been on my mind for years as I have read about the nessecity of dark matter and now dark energy.

 

Black holes have been said to possibly link to other universes.

Maybe there is a great mass lurking beyond our Universe that is connected to these phenomenon.

[C. michael Turner]

What exactly is the nature of Dark Energy(DE).

 

Is it the derivative of the 4 known fundamental forces namely Strong Nuclear,Weak Nuclear,Gravity,Electromagnetism.

 

Or is it a totally Different Energy?

Science says we have 4 fundamental forces but consider the actions of gravity, the weakest force as a different force completely.

Current physics has no clue and makes assumptions which lead to a locked in inability to comprehend reality. If gravity can be considered as a unique operating system and shown to work differently than we currently understand then dark energy is easy to understand. Dark Energy is the term used say that the universe is increasingly accelerating and as and example of the absurdness of that look at throwing a tennis ball up and it not only never slows but increasingly accelerates out if the bounds of gravity, well that is what the universe appears to be doing and the powers that be have coined the phrase dark energy. If gravity pulls then something must be pushing, right?

Here is the bait and switch that has everyone fooled. Gravity doesn't pull, there is a step, an intermediate step that explains everything. At the big bang, space via the critical mass explosion from mass to space, the lowest form of energy conversion was released, the gravitational wave yet unconverted gravitational energy is still bound as mass and energy itself and is slowly converting into space itself. So all matter naturally decays into a gravitational field and when two fields collide there is a wavefront formed which leads to a wavefront backaction tension that is relieved by the matter generating the waves decreasing distance between them. This is the operating system of gravity. So on Earth, when you throw a tennis ball up, wave synchronization between big Earth and little tennis ball creates a backaction tension that is relieved by the tennis ball slowing down and aligning with the earth, touching it as the path if least tension. Now since the big bang nothing is there at the center of where the big back happened to align slow matter down. And since mass is shrinking becoming space, measuring the change momentum requires a constant force moment to moment . So as Force, momentum, is constant and mass is deceasing then the effect us that the decreasing mass increasingly accelerates. It is essentially F=M x A. The way gravity works is different that current science assumes. This explanation tells a different story than the higher ups want you to understand because their grants, money, are based on keeping you in the dark! In this case, dark energy.

Good luck,

Michael Turner

[kvraghavaiah]

What exactly is the nature of Dark Energy(DE).

Is it the derivative of the 4 known fundamental forces namely Strong Nuclear,Weak Nuclear,Gravity,Electromagnetism.

Or is it a totally Different Energy?

 

What exactly is an electric field, magnetic field, gravitational field?; what is the building block of dark matter?

In my view, it is not possible to know answers for these; except explaining one object in terms of another unknown object.

 

At high level, yes we can say that a molecule is made of atoms, an atom is made of subatomic particles.

 

The very root is unknown.

 

However, i tried to unify these multiple unknown questions in to fewer, by identifying the still minute facts of the universe/creation.

I will post them in this forum after a few weeks(max 3 months).

[Time_Travel]

What exactly is an electric field, magnetic field, gravitational field?; what is the building block of dark matter?

In my view, it is not possible to know answers for these; except explaining one object in terms of another unknown object.

 

At high level, yes we can say that a molecule is made of atoms, an atom is made of subatomic particles.

 

The very root is unknown.

 

However, i tried to unify these multiple unknown questions in to fewer, by identifying the still minute facts of the universe/creation.

I will post them in this forum after a few weeks(max 3 months).

 

 

Best of luck in unifying these theories.

 

May be you will succeed where Einstein and likes of Stephen hawking,Roger penrose etc etc failed :D :lol:

 

PS:: some of them are still searching for unification.