Quantum gravity

[saturno2]

Quantum mechanics explains the forces of Nature as
a quantum field where particles interact and transport
small amounts of. Energy - quanta -
Quantum mechanics explains the electromagnetism;
strong nuclear force; weak nuclear force. But fails
with the gravity
In the gravity proposes a particle - graviton - that
transport quanta of gravity - small amounts of
gtravity-
But the graviton has not been found

[saturno2]

I think that gravity is a "field" exerted by an astronómical
object and that behaves as a centripetal or atraction
force towards its center of mass
But this "gravitacional field" is of a different nature that
the quantum field of the Quantum Mechanics.
This gravitacional field does not have particles that
transport quanta of gravity ( small amounts of gravity)

[Ann]

I think that gravity is a "field" exerted by an astronómical
object and that behaves as a centripetal or atraction
force towards its center of mass
But this "gravitacional field" is of a different nature that
the quantum field of the Quantum Mechanics.
This gravitacional field does not have particles that
transport quanta of gravity ( small amounts of gravity)

No one has replied to you, Saturno. I'm lousy at math, so I'm the wrong person to answer you. Still, the question of whether gravity is quantum or not is hugely interesting. Everything in nature appears to be quantum except gravity, and and Einstein's theory of relativity and quantum mechanics have so far proved impossible to reconcile with one another. It is as if nature works according to two different models on two different scales, one that describes nature at the smallest scales and one that describes it at the largest scales. How can they be made to fit together?

Most attempts so far have tried to quantize gravity, to make it compatible with quantum mechanics. String theory is the best-known of these attempts. But string theory has never had a big breakthrough or been accepted by most astronomers, mathematicians and physicists.

Now there is a new suggestion, that gravity is indeed "classical" and not quantum in nature. But to make classical gravity work with quantum mechanics, gravity has to have a component of "stochasity" or randomness in it. Only then can it work together with the little "quanta" of quantum mechanics.

The person behind the new hypothesis is Jonathan Oppenheim. One of his arguments against gravity being quantum is that gravity is directly linked to the passage of time. This means that it gravity is quantum, and comes in little packages, then time must "stop" in the spaces between the little packages of gravity. That does not make sense, says Oppenheim.

Click to play embedded YouTube video.

Ann

[saturno2]

Thanks Ann
Very interesting your explanation

[saturno2]

I think that gravity is a "field" exerted by an astronómical
object and that behaves as a centripetal or atraction
force towards its center of mass
But this "gravitacional field" is of a different nature that
the quantum field of the Quantum Mechanics.
This gravitacional field does not have particles that
transport quanta of gravity ( small amounts of gravity)

I think that in this gravitational field (non quantum)
there are 2 extreme possibilities
1- more mass concentración more gravity
Black holes supermassive that are at the center of
some galaxias they have a large concentración of
mass on the orden of million of solar masses and
generate a very high gravity
2 - More density more gravity
A neutron star has high density and has high gravity
A black holes of stellar mass has high density
( Density taken to the maximum limit) and generates
very high gravity