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dsaun777

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dsaun777

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PeterDonis

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dsaun777

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Would that include massless particles?

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PeterDonis

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Would that include massless particles?

As long as they aren't gravitons, yes.

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haushofer

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Yes. Or, for instance, an electromagnetic field. Not mass, but energy-momentum sources gravity.Would that include massless particles?

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The gravitons would be described by the part of the Lagrangian involving only the metric and its derivatives. In standard GR it'sAs long as they aren't gravitons, yes.

$$\mathcal{L}=\sqrt{-g} R.$$

This includes also interaction terms of the gravitons, as to be expected from a non-Abelian gauge theory. Gravitons as particles would be defined as the asymptotic free states.

The only trouble is that this doesn't work out as it does for the other interactions, and that's why the quantization of the gravitational field is not yet brought into a satisfactory state :-(.

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PeterDonis

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The gravitons would be described by the part of the Lagrangian involving only the metric and its derivatives.

Yes, that's why I said, in response to the OP, that "matter" includes massless particles

- #8

dsaun777

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?The gravitons would be described by the part of the Lagrangian involving only the metric and its derivatives. In standard GR it's

$$\mathcal{L}=\sqrt{-g} R.$$

This includes also interaction terms of the gravitons, as to be expected from a non-Abelian gauge theory. Gravitons as particles would be defined as the asymptotic free states.

The only trouble is that this doesn't work out as it does for the other interactions, and that's why the quantization of the gravitational field is not yet brought into a satisfactory state :-(.

Do you know of any relatively light, no pun intended, material about gravitons?

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No. The problem is nobody has found a satisfactory description of gravitons yet.

- #10

haushofer

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These notes of Hinterbichler about massive gravity,?

Do you know of any relatively light, no pun intended, material about gravitons?

https://arxiv.org/abs/1105.3735

are great imo.

- #11

PeterDonis

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massive gravity

Note that, as the introduction of the notes you reference explains, massive gravity is

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