Graviton Definition and 162 Threads

Hi, Could u advise me please some references where the Feynman rules for graviton are derived I mean graviton-scalar graviton-graviton scattering ... in general graviton vertecies ... Thank you

if gravity is a a sheet of space and time how is it also a graviton particle as in string theory

Hey, guys. I'm going to start off by saying I know near nothing regarding physics and don't claim to be more than completely ignorant in anything passed the fields considered pre-calculus. I have a huge interest in particle physics, though—and have decided to take a more academically rigerous...

I am new at this so I hope you all will excuse me if I am stupid. But I got this idea about the graviton. If it is a wave then it should display some sort of doppler shift when it moves with respect to the observer. So there it is , somebody tell me why I am dumb.

is graviton does really exist?

Hi, i read a few books (pop ones) and one thing that left me thoroughly confused was the relation between graviton and space curvature, is there any relation between the two... if we find a graviton then does it mean that space is not curved? regards Monty

thanks

Hello there. I have a question, or better yet, a proposition on the higgs boson/graviton: would it be possible for these to be one in the same? What I mean by this is that under the assumption that higgs boson does exist (which I agree with) that gravity is then propagated from the boson...

Hello PF community! While reciently reading another thread this paper was posted as a link: http://arxiv.org/ftp/cond-mat/papers/0602/0602591.pdf now about 5 pages in it stated that the authors found a wave length and mass for a graviton? I did not even know they were proven to be...

consider deep inelastic scattering of e-p.assuming that a graviton acts as a propogater in this interaction how would it effect the structure functions of the proton.now we have a spin 2(graviton) instead of the usual spin 1(photon).basically what is the effect of this spin change on the...

Based on the following excerpt, I'd appreciate any general comments/observations and then follow with a specific question. Leonard Susskind says in THE BLACK HOLE WAR, 2008, PG 347 : #: my parenthetical comment I knew physics was crazy, but that just seems "over the horizon" crazy...

Hi, Does graviton scatter and what is the implication? Thanks!

Hi I’m a student, and I started reading Zwiebach’s First Course in String Theory, but I still haven’t learned general relativity, only special relativity, and so I’m having some difficulties in understanding the polarization tensor for the perturbation of the Minkowski metric leading to the...

Is it true that spin 2 graviton will appear to us as spin 0,1 or 2, since it has a momentum component in the bulk? How about fermions and other spin bosons ?

Hi, Could you pls advise me why in on-shell case graviton has two degrees of freedom? and in general how do I calculate bosonic or fermionic degrees of freedom of any particle? I was reading some books about supersummetry and stuck when they said gravitopn has two degrees of freedom and...

is a graviton some kind of energy quantum? how does that reconcile with gravity as the geometry of curved spacetime? Is it energy with little quantum packets? or is it geometry? or is it somehow both? or is it neither and that's just the way we describe it's effects?

Perhaps this is a bit of a naive question, but I'm having trouble with the following issue. It is easy to describe the motion of a test particle near a black hole using classical general relativity. The underlying assumption is that gravity is a geometric manifestation, and the orbits are...

What is the difference between the "God Particle" and the Graviton? I understand that they are looking for, and are hopefully close to finding the Higgs Boson, either with the Tevatron or with the LHC, whichever finds evidence for it first, and that the Higgs supposedly generates a field which...

If I understand things correctly, GR says that gravity isn't really a force at all, gravity is just particles moving in the geometry of spacetime. Given this, I don't understand the role of the graviton. I thought that gauge bosons were force mediators, that they somehow communicated and...

Suppose you have a fine layer of dust facing perpendicular to a strong gravitational body. If gravitons are point particles then could you expect to observe the gravitons pulling at the dust particles one by one as they come into contact with the dust or would the dust move uniformly closer to...

how can people predict that the graviton is a particle of spin 2?

Hopefully I can get some knowledgeable help on this question. I'm not a physicist but I am an electrical engineer (by education anyway) and a database architect by avocation. I'm a bit of a physics junkie and some of my self study leads to this problem. I see a lot of mention of searching...

Hi, I was thinking about the graviton ride at amusement parks - the one that sort of simulates the feeling of gravity by spinning. I was wondering if the pressure between two objects (such as your head and the surface when spinning around) is potentially useful in terms of power generation, via...

Can graviton possible act like gluon ball? Why not?

When Einstein specifically showed there was no gravitational 'force', rather a repulsion of curved space. Is there something wrong with his theory that we must throw it all out the window and replace it with another meaningless hypothetical particle scenario?

Does anyone know if the LHC could detect the graviton thx

GR predicts gravitational waves, and QM says all waves are also particles. But does the particle of gravity have to be a spin-2 graviton? could the particle of gravity be, for example, a quanta of space-time curvature?

On page 36 of QFT in a nutshell, Zee sets an exercise to find the propagator for a massive spin 2 particle by assuming that it is a linear combination of terms such as G_{\mu\nu}G_{\lambda\sigma}. The only method I can think up for doing this is to write down all 36 products of...

From the Not Even Wrong thread on Garrett Lisi's E8 theory: I had some questions in response to this; Woit complained (quite correctly) that my post didn't have anything to do with E8 or Woit's blog and requested the discussion not continue there. So I'm posting it here instead. My response...

With the help of harmonic gauge condition, graviton propagator can be obtained by weak field expansion around the flat Minkowski metric (assuming cosmological constant is zero). Gravitation theory can also be written in the first order (Palatini) formalism. In stead of the metric, the basic...

What proof do we have that the graviton actually exists? Quote from http://hyperphysics.phy-astr.gsu.edu/hbase/particles/expar.html" "The graviton is the exchange particle for the gravity force. Although it has not been directly observed, a number of its properties can be implied from the...

They say that light cannot escape gravitational pull of black holes, and also that gravitation is due to exchange of graviton particles, how can thy photons give out thy graviton, black holes don't exist

Well, not really, but I am really struggling with understanding the motivation for its inclusion in the Standard Model; I'm hoping someone here might provide some guidance. My understanding of General Relativity is that gravitation is a purely local phenomenon; i.e. two massive entities in...

Are the Higgs and the Graviton supposed to interact or are they two different particles from two different theories?

I have finished a quick first reading of the rovelli at all paper ingraviton propagator http://arxiv.org/gr-qc/0604044 I couldn´t dive too much into the details because spin foams was a prerequisite and i only could do an equally fast reading of the alejandro perez review of the subjecto...

If Spin is 'moment of inertia' (I) x 'angular frequency' (w), what does it mean when we say a particle has spin = 1 or spin =2 like in the theoretical Graviton's case?

Hey, Do physicists have any idea about any of the theorized 'graviton's' properties? spin charge rest mass wave length anything? As far I know (which is very little) the only thing we know is Gravity's strength relative to the other 3 forces. P.S. Why was LISA's three arms set...

The graviton has a spin of 2. So, that means the graviton can take possible spins: -2, -1, 0, 1, 2 ? Just want to make sure since, for a photon, even if it's spin 1, it can only take two possibilities, i.e. -1 and +1. 0 is not allowed.

What is the solution for a static graviton flux monopole through a closed surface? :rolleyes: Sphere surface area: dA = 4 \pi r^2 \Phi_G = \oint G_g \cdot dA = \oint G_g \cdot (4 \pi r^2)

We have for Quantum gravity the equation: H|\Psi>=0 as you can see this is time-independent partial differential equation, my question is if we could construct a functional differential equation in the form: \alpha{d\Psi/dt}+\Beta{H_1}=0 where the H1 would have the derivatives respect to...

How do we know that a graviton has to be spin 2?

Would a graviton theory replace the curved geometry of general relativity? If gravitons are the cause of the gravitational force, does that mean space and time aren't really curved as Einstein thought?.. :confused: And maybe an unrelated question, is it better to think of curved space-time...

Is the idea of a graviton reconcilable with general relativity? Is that already quantum gravity or something that works perfectly with existing gr?

Hi. I hope I'm posting in the right place. I was just wondering, what is the difference between the graviton and the higgs boson. I'm not quite sure, I think I sort of understand it... but not really. Also, since I don't want to make a new thread for such a small question, is there...

gravitons ?? is the inertial mass proportinal to the gravitational mass in the graviton theory of gravitation ? I ask this because I can see easily how GR imply that the two masses must be equal since spacetime curvature acts at everypoint in the body. But with gravitons I can't understand how...

an underlying fabric that permeates even a vacuum space and displays liquid like characteristics (most evident on a macro and micro cosmic scale ie wave particle duality, dark energy) the energy of this fabric is known as c, the speed of light which is the manifestation of the expansion...

I was wondering if anyone has any insights or can guide me to some decent literature of the coupling of the graviton to mass. I became intrigued about this when thinking about presenting the gravitational interaction in a Feynman diagram. If anyone has any ideas or knows I would greatly...

I posted this in general physics, but I didn't get an answer, so I'll try again here: Einstein's theory of general relativity was motivated by his equivalence principle, that no experiment can distinguish between an accelerated frame and a still frame under the influence of gravity. But if...

Hello everyone! How does the effects of gravitons work in different media? I know it expands with the speed of light, but since light has different speeds in different media, does gravitons aswell? I'd appreciate any answers.

Alejandro recently submitted a post at SPS which engaged the active attention of Lubos Motl. So much so that unless one has sharp eyes one cannot see Alejandro's original post-----there are so many "moderator notes" inserted by Lubos. this means Alejandro's original post probably has some...