witam
On Wed, 4 Jan 2006, Andrzej Marecki wrote:
Better late than never... Only now I have spotted this:
Hmmm, looks like both sides of the road in Pune - TIFR (radio) and IUCAA (optical) are working together to test the claims of fine structure constant evolution...
The most recent claim i see is:
http://de.arxiv.org/abs/astro-ph/0310318 Murphy, Flaumbaum, Webb et al claim dalpha/alpha= (-0.57 +/- 0.11)x10^{-5} = -(6 \pm 1) *10^-6
0510760 is Nissim Kanekar (TIFR graduate) et al. getting an upper limit on (Delta alpha)/alpha < 6.7 \times 10^{-6}
while more than a year earlier, Srianand (IUCAA) et al. got : http://arxiv.org/abs/astro-ph/0402177 over 0.4<z<2.3 : \Delta\alpha/\alpha = (-0.06+/-0.06) x 10^{-5} = -(6 \pm 6) * 10^-7
Well, IMHO -6e-6 < + 6.7e-6 so if the signs are correct, then the OH constraints (Nissim Kanekar et al.) certainly don't rule out the detection claim. And if the sign convention is wrong, then we still have 6e-6 < 6.7e-6, which is still consistent.
On the other hand, Srianand et al. get one order of magnitude better:
-(6 \pm 6) * 10^-7
Figure 3 of Srianand et al. 0402177 is fairly clear and it looks like the statistics against the claimed Murphy et al. result are quite robust.
pozdr boud