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Science-Related Homework Help Physics Topic started by: datadisha on Jan 1, 2013



Title: Why is a quantum theory of gravity necessary to explain the origins of the universe?
Post by: datadisha on Jan 1, 2013
Did gravity even exist in those first few (mili)seconds after the Big Bang?


Title: Why is a quantum theory of gravity necessary to explain the origins of the universe?
Post by: Tonjia on Jan 1, 2013
yes, gravity was the first of the four forces to separate from the others.


Title: Why is a quantum theory of gravity necessary to explain the origins of the universe?
Post by: datasian on Jan 1, 2013
we have some idea of how gravity behaves Newtons laws

a fanciful explanation of what gravity "really is" einstein's General Relativity but it is very incomplete

In short NOBODY HAS THE FAINTEST IDEA

the best current physics sees four fundamental forces or interactions in the Universe

Electrical, magnetic, Weak Nuclear ( allows radioactive) and Strong Nuclear ( holds atoms together, and gravity

there is a dream of a single unified idea that explains all

so fare we have combined Electrical and magnetic  into electromagnetism, + WEAK so we now have electro- weak. not sure if Strong is understood but gravity just does not fit at all.


Title: Why is a quantum theory of gravity necessary to explain the origins of the universe?
Post by: Dat Ass on Jan 1, 2013
Because, for the present at least, this is the simplest way to explain all the observed facts and fit in with all the verified calculations.

Like all theories, this doesn't mean it's absolute fact, but simply the best and simplest model that fits all the facts.


Title: Why is a quantum theory of gravity necessary to explain the origins of the universe?
Post by: tony12 on Jan 1, 2013
The origin of the universe has been so diluted by perpetual multiplication and division of time, size and space it only exists in the theory of everything.


Title: Why is a quantum theory of gravity necessary to explain the origins of the universe?
Post by: tonio on Jan 1, 2013
Who claims that it IS necessary to explain the origins of the Universe? The Big  Bang theory says NOTHING specifically about gravity.


Title: Why is a quantum theory of gravity necessary to explain the origins of the universe?
Post by: nursing on Jan 1, 2013
Figuring out exactly how gravity is one of the big pieces needed for a theory of everything, which will supposedly greatly benefit mankind and lead to great advancements in science, and so could help answer the question about the origins, evolution and fate of the universe.


Title: Why is a quantum theory of gravity necessary to explain the origins of the universe?
Post by: tony51092 on Jan 1, 2013
Gravity as explained by relativity governs very big stuff. Galaxies, stars, planets etc. and quantum mechanics governs the very small stuff. But you can only ever use one or the other you can't use both it just doesn't work. The thing about the early universe is that you have all the stuff in a very small space, it's combined the two which means in order to understand it, we have to combine them too. Obviously I'm over simplifying this but you get the idea. In those very first few nanoseconds neither one works, but a unified theory would.


Title: Why is a quantum theory of gravity necessary to explain the origins of the universe?
Post by: smokin7acehole on Jan 1, 2013
In the first moment of Creatiion, only EMR of light existed. A photon of light does NOT have gravity so there was no gravity at that time.
Light moves in straight lines, but bends or refracts due to increase in flux density or optical density.
Light undergoes Total Internal Reflection when it enters a region of high flux density at a critical angle.
Thus, the formation of the Black hole, worded in the Genesis as "He separated Darkness from the light" did NOT need gravity to occur. Gravity existed only after this moment.