Results 81 to 90 of about 1,573 (148)
Mott transition in bosonic systems: Insights from the variational approach
, 2008 We study the Mott transition occurring for bosonic Hubbard models in one, two, and three spatial dimensions, by means of a variational wave function benchmarked by Green's function Monte Carlo calculations.
Becca, Federico +3 more
core +1 more source
Biodiversidade Brasileira, 2019 A concept for Integrated Fire Management (IFM) on terrain contaminated by radionuclides in the Chornobyl Exclusion Zone (CEZ) was developed within cooperative efforts of the U.S.
Sergiy Zibtsev +5 more
doaj +1 more source
Evolution of Nuclear Spectra with Nuclear Forces [PDF]
, 2002 We first define a series of NN interaction models ranging from very simple to fully realistic. We then present Green's function Monte Carlo calculations of light nuclei to show how nuclear spectra evolve as the nuclear forces are made increasingly ...
A. Bohr +8 more
core +2 more sources
Theoretical constraints for the magnetic-dimer transition in two-dimensional spin models
, 2005 From general arguments, that are valid for spin models with sufficiently short-range interactions, we derive strong constraints on the excitation spectrum across a continuous phase transition at zero temperature between a magnetic and a dimerized phase ...
Federico Becca +3 more
core +1 more source
Pauli-Potential and Green Function Monte-Carlo Method for Many-Fermion Systems [PDF]
, 1995 The time evolution of a many-fermion system can be described by a Green's function corresponding to an effective potential, which takes anti-symmetrization of the wave function into account, called the Pauli-potential.
Bakker, B. L. G. +2 more
core +4 more sources
Doping quantum dimer models on the square lattice
, 2006 A family of models is proposed to describe the motion of holes in a fluctuating quantum dimer background on the square lattice. Following Castelnovo et al. [Ann. Phys. (NY) 318, 316 (2005)], a generalized Rokhsar-Kivelson Hamiltonian at **finite doping**
Arnaud Ralko +7 more
core +3 more sources
Phase diagram of the lattice Wess-Zumino model from rigorous lower bounds on the energy
, 2004 We study the lattice N=1 Wess-Zumino model in two dimensions and we construct a sequence $\rho^{(L)}$ of exact lower bounds on its ground state energy density $\rho$, converging to $\rho$ in the limit $L\to\infty$. The bounds $\rho^{(L)}$ can be computed
A. Feo +22 more
core +1 more source
, 2016 A quantitative understanding of neutrino-nucleus interactions is demanded to achieve precise measurement of neutrino oscillations, and hence the determination of their masses.
Lovato, Alessandro
core +1 more source
A Constrained Path Quantum Monte Carlo Method for Fermion Ground States
, 1995 We propose a new quantum Monte Carlo algorithm to compute fermion ground-state properties. The ground state is projected from an initial wavefunction by a branching random walk in an over-complete basis space of Slater determinants.
A. Parola +17 more
core +1 more source
iForest - Biogeosciences and Forestry, 2016 This study proposes and evaluates a relatively new concept for fire occurrence zoning based on documented historical fire records. The proposed method creates continuous kernel density surfaces based on wildland fire ignition observations.
Koutsias N +5 more
doaj +1 more source