# Talk:Conformal symmetry

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Field: Geometry

## Conventions

Where do the forms of the generators come from? According to me they aren't the conventional forms. It should rather be:

$M_{\mu\nu}\equiv i(x_\mu\partial_\nu-x_\nu\partial_\mu),$
$P_\mu\equiv-i\partial_\mu,$
$D\equiv-ix_\mu\partial^\mu,$
$K_\mu\equiv i(x^2\partial_\mu-2x_\mu x_\nu\partial^\nu),$

For example if we take a function $f(x_\mu)$ and we dilate it, we get

$f((1+\epsilon)x_\mu) \approx f(x_\mu) + \epsilon x_\mu\partial^\mu f(x_\mu)$

which should be the same as

$e^{i\epsilon D} f(x_\mu) \approx f(x_\mu) + i\epsilon D f(x_\mu)$

Greets, David 08:39, 8 June 2007 (UTC)

I've cleaned it all up myself. MuDavid (talk) 12:22, 13 October 2009 (UTC)

## Errors in commutation relations

The definition of P is wrong, should be

$P_\mu=i\partial_\mu$

See L.H. Ryder, "Quantum Field Theory", 2nd ed. Antimatter33 (talk) 03:35, 25 December 2010 (UTC)