Dear developers,

I'm using the dirloop_sse code to simulate the hardcore boson Hubbard model, I met some problems there:

(1) An error occors in many simulations, that is, Internal error: size of prob table is zero.

(2) In a ladder model, the stiffness I get from the sse code is much smaller (almost zero) than using other codes (not ALPS code). While in a square lattice, the sse code gives the same stiffness with other codes; BTW, does the definition of stiffness in the ALPS codes miss a factor of 2 in the denominator?

(3) When I input some values of chemical potential (mu), I can get the corresponding particle density (rho). When mu is close to zero, the data of rho are not good, while for other mu, the data are nice.

PS: I attach my parameter file below, do I make something wrong in the parameters?

LATTICE="ladder";

L=64;

MODEL="hardcore boson";

V = 0.0;

V' = 0.0;

t = 1.0;

t' = 1.0;

T = 0.03125;

SWEEPS=10000000;

THERMALIZATION=1000000;

{ mu=-0.1; }

Best,

TaoYing

Tao Ying,

Ph.D candidate,

Physics department

Harbin Institute of Technology