507 citations · 2.7k across the 62 of their papers we have counts for
62 papers
On the rotator Hamiltonian for the SUSU sigma-model in the delta-regime
J. Balog, F. Niedermayer, P. Weisz
We investigate some properties of the standard rotator approximation of the SUSU sigma-model in the delta-regime. In particular we show that the isospin susceptib…
Finite volume mass gap and free energy of the SU(N)xSU(N) chiral sigma model
Ferenc Niedermayer, Peter Weisz
We compute the free energy in the presence of a chemical potential coupled to a conserved charge in the effective SU(N)xSU(N) scalar field theory to third order for asymmetric volu…
Casimir squared correction to the standard rotator Hamiltonian for the O() sigma-model in the delta-regime
Ferenc Niedermayer, Peter Weisz
In a previous paper we found that the isospin susceptibility of the O() sigma-model calculated in the standard rotator approximation differs from the next-to-next to leading ord…
Isospin susceptibility in the O() sigma-model in the delta-regime
Ferenc Niedermayer, Peter Weisz
We compute the isospin susceptibility in an effective O() scalar field theory (in dimensions), to third order in chiral perturbation theory (PT) in the delta--regime us…
O(3) model with Nienhuis action
Ferenc Niedermayer, Ulli Wolff
We study the O(3) sigma model in on the lattice with a Boltzmann weight linearized in on each link. While the spin formulation now suffers from a sign-problem the equival…
Comparison of algorithms for solving the sign problem in the O(3) model in 1+1 dimensions at finite chemical potential
Sandor D. Katz, Ferenc Niedermayer, Daniel Nogradi +1
We study three possible ways to circumvent the sign problem in the O(3) nonlinear sigma model in 1+1 dimensions. We compare the results of the worm algorithm to complex Langevin an…