Dear, Is there a method for the simulation of the system with competing interactions e.g dipolar r^{-3} and quadrupolar r^{-5} distance dependence? From the paper Fukui and Todo it is not clear for me. Best regards, Tadeusz On Sat, 22 Aug 2009 12:00:03 +0200, comp-phys-alps-users-request wrote

...

Message: 1 Date: Fri, 21 Aug 2009 19:07:39 +0900 From: Synge Todo <wistaria@comp-phys.org> Subject: Re: [ALPS-users] inverse-sqare 1d ising chain To: Andrea Taroni <andrea.taroni@fysik.uu.se>, comp-phys-alps-users@phys.ethz.ch Message-ID: <EDEE50B2-E084-4602-B562-AA97D75E62B3@comp-phys.org> Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes

Dear Andrea,

Currently, ALPS lattice and model libraries do not support long- range interactions, though you can simulate such models by specifying a graph with N(N-1)/ 2 bonds with different bond types for different bond lengths (and it will take O(N^2) CPU time).

Or, I can send you our QMC code used in Fukui and Todo (2009) if you want.

Best, Synge

On 2009/08/21, at 17:45, Andrea Taroni wrote:

...

Dear All,

Is there a straightforward way to simulate the classical inverse- square Ising model using ALPS? By straightforward, I mean using the kind of recipe that is described in the tutorials section of the APLS applications website.

I am interested in comparing any eventual results with those presented by Fukui and Todo J. Comp. Phys. 228, 2629 (2009), using a novel order-N cluster MC method.

Thanks in advance!

Andrea

End of Comp-phys-alps-users Digest, Vol 41, Issue 3 ***************************************************

Prof. dr hab. Tadeusz Wasiutynski H. Niewodniczanski Institute of Nuclear Physics PAN tel. +48(12)6628251 fax: +48(12)6628251 e-mail: tadeusz.wasiutynski@ifj.edu.pl