Dear Nils,

For now, please look atthe data in Figure 3 of the attached paper
for U=10 and U=12.  This gives the local moment, from which of course you
can extract D via D = (1-m^2)/2.  I will try to find the data, but measuring off the graph with a ruler I see quite close to your
claimed 50% increase in D.  I would say, however, that the smallest
D occurs at a T/t  closer to 0.5 than 0.4.  the value, again just judging
from the graph, seems to be quite close to your 0.025.

A warning is that the data is for 6x6 lattices.  We expect finite size
effects to be small, especially as U increases, but yu can see
what their size is for U=4 in Figure 2.

We'll see what Thereza comes up with.  I may try to do a few runs
on different lattice sizes and with different Trotter step sizes for
U=10 so that we can get a number for you which is corrected both
for finite size error and for the discretization of imaginary time.

Richard Scalettar
Professor and Vice Chairman, Physics Department
University of California, Davis 95616
phone 530-554-1605
fax   530-752-4717
email scalettar@physics.ucdavis.edu
http://leopard.physics.ucdavis.edu/rts/