Linked Questions

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0answers
54 views

Unified theory of gravity [duplicate]

I have heard that a lot of times, but I have never completely understood what is a force theory unified with quantum mechanics, and also, why do we need this kind of gravitational theory to fully ...
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0answers
38 views

Quantum gravity: How do we know gravity operates at quantum scales? [duplicate]

Edit: An alternate angle on the original question I asked below: Would general relativity still create singularities in special cases (center of black holes) if we assumed that gravity had a lower ...
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1answer
107 views

What if quantum mechanics and general relativity are not connected? [duplicate]

The main objective in modern physics research is to find a way to unify quantum mechanics and general relativity thorugh a series of theoretical approaches called "quantum gravity theories" But what ...
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2answers
113 views

What is the motivation for developing a “theory of everything”?

What is the reason physicists are working so hard looking for a "theory of everything" and trying to unify gravity with quantum mechanics? Historically, new theories were always developed to explain ...
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0answers
93 views

Does the existence of graviton contradict gravity being spacetime curvature? [duplicate]

Is gravity a property-curvature of space-time it's self as descriped in GR? Or the notion of 'graviton' is necessary in order to embed the 'classical GR theory' to the quantum's mechanics 'world' ...
2
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1answer
105 views

Can Bohr-Kramers-Slater (BKS) theory examples be generalized to prove that classical gravity is futile?

In the comment in What are the reasons to expect that gravity should be quantized? by Ron Maimon, it is mentioned that taking analogy from classical electromagnetic wave to classical grvational wave, ...
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1answer
239 views

If gravity arises from the curvature of spacetime, why is there a need for gravitons? [duplicate]

If gravity arises from the curvature of space time, why is there a need for gravitons? If someone could explain this to me I would be very thankful. I dont understand why.
10
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2answers
862 views

Why does gravity need a graviton? [duplicate]

Einstein theorized that gravity is a phenomena manifested by the curvature of spacetime, in effect it IS the curvature of spacetime. If this is so, why do we need a graviton to convey the force of ...
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3answers
451 views

Why to unify gravity with the other forces if gravity isn't really a force?

As I understand, the Theory of General Relativity says that the force of gravity doesn't exist. The planets move in elliptical orbits because the spacetime is curved by the mass of the sun, not ...
3
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0answers
166 views

Why Shy away from non-local nature of gravitational energy/momentum?

Feel free to tear me a new one, This is something that has been bothering me a while. The very nature of attempting to write gravitational energy/momentum (called the stress energy pseudotensor), ...
1
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0answers
96 views

Gravity and graviton [duplicate]

If gravity is merely a consequence of massive bodies and the curvature of spacetime, why do we believe a graviton should exist in order to transmit gravitational forces.
2
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1answer
474 views

Why are gravitons needed to explain gravitational attraction in quantum gravity? [duplicate]

I've read and heard multiple times that gravity can't be explained by the current understandings of quantum physics. Wikipedia's Gravity entry briefly explains the incompatibility between general ...
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0answers
95 views

I wondered what proof exist for the existence of gravitons?

It seems from my perspective that gravity is an indirect trait of matter; meaning that gravity is a trait of spacetime itself and that when matter interacts with spacetime, a bend occurs producing ...
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0answers
61 views

What´s the physical foundation of the assumption that the curvature of spacetime can be quantised? [duplicate]

At the moment different paths (by percentual very few people in the world) are taken to arrive (that is, if an arrival exists) at a theory that can quantise the curvature of spacetime. Considering the ...
1
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2answers
148 views

Why do black holes need a quantum mechanical description?

I read about black holes, about the Schwarzschild metric, Einstein field equations and their solution in the vacuum for a spherical body. I understood black holes are object whose gravity is enormous,...

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