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The Planck Length is equal to $1.616199 \times 10^{-35}$m which is roughly $100$ billion billionth of the diameter of a proton. It is a base unit defined in terms of the five physical constants $G, \hbar, c, (4 \pi \varepsilon_{0})^{-1}$ and $\kappa_{B}$. No areas of current research (that I know of) question the idea of the Planck length or indeed any of ...


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"What is spacetime at Planck length? Once we understand that we will be able to formulate the theory of Quantum Gravity..." This is from Zizzy's Spacetime at the Planck Scale: The Quantum Computer View. So to get an answer one has to pick one of the current contenders, string theory, loop quantum gravity, or lesser known non-commutative geometry, causal set ...


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I think it is best to answer the question "What are gravitons?" to find out what they do. In quantum field theory, one constructs fields from representations of the Poincare group. The Poincare group has a rotation subgroup, so the fields have certain transformation properties under rotations, which we refer loosely to as the particle's spin. From this ...


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Yes, I know gravitons are 'just a theory', but I'm wondering how they theoretically act. To echo Anna's answer, but putting it more bluntly: they don't. And see how John Rennie mentioned Matt Strassler's article? See this line from it: "A virtual particle is not a particle at all". Electrons and protons don't throw photons at one another. Hydrogen atoms ...


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From the analogue of simple quantum mechanics Feynman diagrams, the graviton is what is being exchanged for two particles to feel an attractive force. Analogous to the exchange of a photon for the electron to interact with another electron. first order feynman diagram electron electron interaction The analogous diagram for the gravitational ...


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Imagine you are sitting a rowing boat on a lake. Stern-to-stern is another boat with an accomplice in it. You are both sitting facing each other (and the stern of your boat). The lake is still, there is no wind. You have a brick on your lap. You take the brick and gently lob it to your accomplice who catches it. What happens? By conservation of momentum, ...


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The acceleration of gravity is that itself. The bigger the mass the more gravity pulls on the object. Especially with a force. This could be simplified into an equation we learned in Intro-Physics, F=ma or f=mg



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