Linked Questions

4 votes
1 answer
538 views

What is the problem with quantizing GR in the Effective Field Theory approach?

In the modern view due to Wilson, the cut-off $\Lambda$ is an intrinsic property of a theory and renormalization just means that the theory is invariant under scale transformations below $\Lambda$. ...
user avatar
3 votes
3 answers
323 views

How does string theory relate superposition and general relativity?

So I know that in general relativity, superposition cannot be true. However, since string theory supposedly connects quantum mechanics and gravity, how does it relate superposition and gravity?
Jungwoon Song's user avatar
7 votes
2 answers
1k views

From Quantum Mechanics to Quantum field theory to String theory?

Today during a very "unique" study session, I might have internalized why Quantum mechanics was not enough, and Quantum field theory makes sense. It seems the reasons are that When a potential is ...
user avatar
3 votes
2 answers
377 views

GR says that time and space are aspects of the same thing, yet there is no observable for time in QM

I understand that the topic of a time operator in quantum mechanics has come up more than a few times so forgive me if this is a repeat question but I couldn't find anything specific to my question. ...
JeneralJames's user avatar
5 votes
1 answer
606 views

Can Newtonian gravity be quantized?

Today, nobody knows how GR is truly supposed to be married with QFT. As a result, the standard model as it is typically presented does not include gravity. Could it be modified to include Newtonian ...
Display Name's user avatar
3 votes
2 answers
604 views

Quantum mechanics + General relativity =?

I have learned (the basics) of how one can incorporate the principles of special relativity to quantum mechanics to obtain quantum field theory. Can the same be done with GR and QM to obtain a new ...
TROLLHUNTER's user avatar
  • 5,172
4 votes
2 answers
335 views

How to fuse quantum mechanics and general relativity?

I am very new to this topic but I have started reading Kevin Wray's lecture notes about string theory (PDF) and in the introduction he says: "Sometimes it is said that we don’t understand how to ...
Quasar's user avatar
  • 415
1 vote
2 answers
402 views

How are scalar fields = particles?

Two such particles I'm thinking of are the inflaton & the Higgs. They are both scalar fields, but they're also both particles with well-defined masses. How is it that scalar fields correspond to ...
Allure's user avatar
  • 20.5k
1 vote
1 answer
480 views

In the Standard Model of particle physics, why we ignore the gravitation force?

In the Standard Model of particle physics, we consider only three forces, my question is about the gravitation force why we ignore?
Nassrine's user avatar
0 votes
1 answer
202 views

Does free-fall imply that it is impossible to quantize gravity? [closed]

I will start by stating that I realise that there already exist questions on the compatibility of GR and QM (e.g. here) but my question is different. In this essay the following argument is made (pg ...
user1887919's user avatar
  • 1,709
1 vote
1 answer
395 views

Programs trying unifying QM and GR instead of QFT and GR?

Is there any program which attempts at unifying quantum mechanics and gravity rather than unifying quantum field theory and gravity? Motivation We use the heisenberg picture to define velocity $\hat ...
drewdles's user avatar
  • 1,177
2 votes
1 answer
210 views

Has QFT successfully mediated between QM and Special Relativity?

I understand that QFT is the theoretical framework for combining QM and Special Relativity, but as I understand it, though even without proof or experimental confirmations; has QFT managed to "behind ...
GammaRay's user avatar
  • 177
0 votes
1 answer
252 views

What are details of this claim of Penrose about gravity and QFT being at odds with each other?

Question Can someone flesh out the details of the argument Roger Penrose makes in this video of a lecture he gave on twistors (starting around 1:25:15) or recommend me the appropriate literature (...
More Anonymous's user avatar
1 vote
2 answers
248 views

Is there is a concensus among physicists if spacetime actually curves and if so what is it?

Going off from what others have told me on here, and based on the Wikipedia page for Quantum Gravity, General Relativity can be described mathematically in a way different than the geometrical curved ...
Thatpotatoisaspy's user avatar
0 votes
2 answers
318 views

Why is time explained differently?

In quantum mechanics time is a classical background parameter and the flow of time is universal and absolute. In general relativity time is one component of four-dimensional spacetime, and the flow of ...
Dipson Khadka's user avatar

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