Other Models for varying Lambda
There is a prediction of (stochastically) varying Lambda from Causal Sets. See http://arxiv.org/abs/0710.1675 and http://arxiv.org/abs/astro-ph/0209274.
(In fact I should add that the model also predicted a non-zero cosmological constant of the right order of...
For the measure, you prove it by noting that
\int d^4p \delta(p^2)
is a lorentz invariant and by the properties of the dirac delta function this reduces to the given measure over three momentum. I don't see how there would be an analog in the case of 'errors'
Hi,
In the derivation of scattering amplitudes (e.g. page 94 in http://kcl.ac.uk/content/1/c6/06/20/94/LecturesSM2010.pdf ) does anyone have a clue as to how to prove that the momentum uncertainty element
(\delta p)^3/E
is Lorentz invariant? I know how to do it for the measure d^3p/E...
Can anybody tell me why atomic decays are usually only through electric dipole transitions, while nuclear decay often shows many different multipoles? i think that the transition rate for electric dipole transitions is much larger than for magnetic ones, but that doesn't really explain it. would...