# Why is the graviton non-renormalizable?

1. Jul 2, 2010

### cuallito

Okay, I've taken relativistic E&M and the first semester of quantum mech.

Why is the graviton non-renormalizable? As I understand it, renormalization means that you can apply a "weight" to the feynman diagrams of an interaction to make it come out right (is that correct?) Why can you not do this for gravitons?

2. Jul 2, 2010

### sheaf

Here are a couple of introductory papers on renormalisation:
http://arxiv.org/abs/0812.3578" [Broken]

and

http://arxiv.org/abs/hep-th/0212049" [Broken]

Part of the renormalization procedure involves adding counterterms to the Lagrangian. The problem with the conventional approach to quantizing gravity, as I understand it, is that the number of counterterms required grows with each order of the perturbation expansion.

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