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keepit
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What are the current theories as to the source of the new space that accounts for dark energy?
keepit said:What are the current theories as to the source of the new space that accounts for dark energy?
keepit said:By "new space" i guess i mean the changes in distances that are occurring.
I understand that decrease in the rate of expansion but it is also true that a distant galaxy's distance from us is not as different last year as it will be this year. I assume that can be called acceleration.
What are the current theories as to the source of the new space that accounts for dark energy?
In general relativity, the evolution of the expansion rate is parameterized by the cosmological equation of state (the relationship between temperature, pressure, and combined matter, energy, and vacuum energy density for any region of space). Measuring the equation of state for dark energy is one of the biggest efforts in observational cosmology today.
...Independently from its actual nature, dark energy would need to have a strong negative pressure (acting repulsively) in order to explain the observed acceleration in the expansion rate of the universe...
Quote by Phantom13
4.) How do scientists observe the effects of dark energy other than seeing that the expansion of the universe is accelerating?
A smaller but still noticeable effect is on the rate of formation of galaxy clusters. Dark energy tends to make such clusters form more slowly. This effect can be seen in the CMB with what is known as the Integrated Sachs-Wolfe effect, and there are also other studies directly measuring the formation of structure in the universe (such as weak lensing surveys) that are investigating this.
keepit said:Considering the pictures describing the warping of pace in that space seems to go out of existence in locations of high gravity (motion is altered or made to seem like there is less distance than would have been expected between objects). Where does this space go to and when there is little gravity, where does this expanding space come from. Sorry but i know I'm ignoring your explanation of the geometry for the moment.
I'm trying to get my mind around the thought that it is only geometric change. It may take a while.
...which would actually be composed of many little new distances that would add up to the new distance...
'new little distances" would only come in when gravity is weak such between galxies but not within galaxies?
...Accelerated expansion due to dark energy causes even strong large-scale potential wells (superclusters) and hills (voids) to decay over the time it takes a photon to travel through them. A photon gets a kick of energy going into a potential well (a supercluster), and it keeps some of that energy after it exits, after the well has been stretched out and shallowed...
In either view, as the inflationary field slowly relaxes[why?] to the vacuum, the cosmological constant goes to zero, and space begins to expand normally.
Space is not a "thing".
...Einstein started with a Machian point of view where space and time are not physical entities but all what counts are relations (signals, interactions, ...) of physical entities (bodies, fields, ...). But as we know Einstein did not "succeed"; the story GR tells us about spacetime is different. Here spacetime seems to be a physical entity which can exist w/o objects or relation between objects (it cannot be 'observed' w/o test particles, but that's a different story).
keepit said:"in what sense do you think of space as a thing that comes into existence?"
I'm going to try to give a thought that will be pummeled but I'm here to learn.
Could space be like a blob of something that can be stretched or compressed? When it is stretched could space from the other dimensions (Calabai yau) move to fill the less dense space and vice versa could space from our dimensions be compressed into the Calabai Yau spaces. Could gravitons be the mediator of this stretching and compressing?
Contrary to popular belief, science does not deal in causes, in the everyday sense of that term. Physicists sometimes talk about 'causality' but that usually means something quite different from the everyday meaning. What science does is find mathematical laws that describe how systems evolve. Einstein's GR equation is an example of that. Einstein didn't say anything about 'why' spacetime obeys that equation. He just hypothesised that it does, then did some calculations that enabled us to experimentally test whether it does, and it did.keepit said:As i understand it, mathematics sometimes only describes relationships and changes but sometimes not the causes of the changes. If that is true, could you apply that reasoning to the cause of the geometric changes? I apologize if this is too philosophical.
New space refers to the concept of expanding the known universe beyond the observable universe. This expansion is believed to be driven by dark energy, a mysterious force that makes up about 68% of the universe's total energy. New space theories attempt to explain how dark energy influences the expansion of the universe.
Dark energy and dark matter are two separate but often confused concepts. Dark matter is a hypothetical form of matter that does not interact with light, but has been observed through its gravitational effects on visible matter. On the other hand, dark energy is a form of energy that is thought to permeate all of space and is responsible for the acceleration of the universe's expansion.
The existence of dark energy is supported by several lines of evidence, including observations of the accelerating expansion of the universe from type Ia supernovae, the cosmic microwave background radiation, and the distribution of galaxies. These observations all suggest that the expansion of the universe is accelerating, which can be explained by the presence of dark energy.
Scientists use various methods to study and measure dark energy. One approach is through observations of distant supernovae, which can provide information about the rate of the universe's expansion. Another method is through the study of the large-scale structure of the universe, which can reveal the distribution of matter and energy. Scientists also use powerful telescopes and instruments, such as the Dark Energy Camera and the Dark Energy Spectroscopic Instrument, to gather data and make measurements related to dark energy.
Understanding dark energy could have significant implications for our understanding of the universe and its ultimate fate. If we can better understand the nature of dark energy, we may be able to predict the future expansion of the universe and gain insight into the fundamental laws of physics. Additionally, understanding dark energy could potentially lead to new technologies and advancements in our understanding of the universe's origins and evolution.