Yes, there is a prefactor. What is called "stiffness" should better be called winding number. You have to multiply it with the right power of the system size depending on the dimension of your lattice.

Matthias

On Dec 14, 2010, at 12:43 PM, Xiao Quan Yu wrote:

Dear all,

   I am now studying the 3D bose glass model. By using SSE, I got the

stiffness is 2.2427 from the following setting:

LATTICE_LIBRARY="lattices.xml"; LATTICE="inhomogeneous simple cubic lattice"; L=5; MODEL_LIBRARY="models.xml"; MODEL="hardcore boson"; t = 1.0; T = 0.1; delta=10.0; SWEEPS=500000; THERMALIZATION=10000; EPSILON=0.25; { DISORDERSEED = 34275; mu=delta*2*(random()-0.5); }

My question is: why this stiffness is larger than one? Is there some scaling prefactor in front? Thank you in advance!

Best, Xiaoquan

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