Results 81 to 90 of about 1,581 (150)

Exact Monte Carlo time dynamics in many-body lattice quantum systems [PDF]

, 2004
On the base of a Feynman-Kac--type formula involving Poisson stochastic processes, recently a Monte Carlo algorithm has been introduced, which describes exactly the real- or imaginary-time evolution of many-body lattice quantum systems.
Assaraf R, Beccaria M, Carlo Presilla, Ceperley D M, De Angelis G F, De Angelis G F, Hetherington J H, Hubbard J, Massimo Ostilli, Matsubara T, Ostilli M, Sandvik A, Trivedi N   +12 more
core   +3 more sources

Climate Change, Wildfires and Fir Forests in Greece: Perceptions of Forest Managers

South-East European Forestry, 2015
Background and Purpose: The potential impact that climate change may have on fire regime in ecosystems that are not fire-dependent emerges from fires that are nowadays spreading over higher altitudes and northern latitudes. The effects of fire occurrence
Ioannis Mitsopoulos, Yannis Raftoyannis, Dimitrios Bakaloudis   +2 more
doaj   +1 more source

Concept for Integrated Fire Management on Terrain Contaminated by Radionuclides in the Chornobyl Exclusion Zone

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, Johann Georg Goldammer, Victor Myroniuk, Vasyl Gumeniuk, Olexandr Soshenskii, Petro Yavorovskii   +5 more
doaj   +1 more source

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, Capello, Manuela, Fabrizio, Michele, Sorella, Sandro   +3 more
core   +1 more source

Diffusion Monte Carlo study of two-dimensional liquid $^4$He

, 1995
The ground-state properties of two-dimensional liquid $^4$He at zero temperature are studied by means of a quadratic diffusion Monte Carlo method. As interatomic potential we use a revised version of the HFDHE2 Aziz potential which is expected to give a ...
B. E. Clements, B. E. Clements, B. E. Clements, B. M. Abraham, D. M. Ceperley, D. M. Ceperley, E. Cheng, E. Cheng, F. Dalfovo, J. Boronat, J. Boronat, J. Casulleras, J. Casulleras, M. Wagner, P. A. Whitlock, R. A. Aziz, R. A. Aziz, S. A. Chin, S. A. Chin, S. Giorgini, W. L. McMillan   +20 more
core   +2 more sources

Quantum simulations of the superfluid-insulator transition for two-dimensional, disordered, hard-core bosons

, 1994
We introduce two novel quantum Monte Carlo methods and employ them to study the superfluid-insulator transition in a two-dimensional system of hard-core bosons.
E. L. Pollack, E. S. Sørensen, G. T. Zimanyi, H. G. Evertz, J. Carlson, J. E. Gubernatis, K. J. Runge, K. J. Runge, M. H. Kalos, M. Makivic, M. P. A. Fisher, M. Wallin, N. Kawashima, N. Kawashima, N. Kawashima, N. Trivedi, Shiwei Zhang, T. Matsubara, Y.-H. Tu   +18 more
core   +1 more source

Identification of an RVB liquid phase in a quantum dimer model with competing kinetic terms

, 2006
Starting from the mean-field solution of a spin-orbital model of LiNiO$_2$, we derive an effective quantum dimer model (QDM) that lives on the triangular lattice and contains kinetic terms acting on 4-site plaquettes and 6-site loops.
Arnaud Ralko, Federico Becca, Francois Vernay, Frédéric Mila, K. I. Kugel   +4 more
core   +1 more source

Quantum Monte Carlo calculations of excited states in A = 6--8 nuclei

, 2004
A variational Monte Carlo method is used to generate sets of orthogonal trial functions, Psi_T(J^pi,T), for given quantum numbers in various light p-shell nuclei.
A. Bohr, J. Carlson, R. B. Wiringa, Steven C. Pieper   +3 more
core   +1 more source

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, Alessandra Feo, E. Witten, E. Witten, Gian Fabrizio De Angelis, H. Nishimori, H.A. Wischmann, J. de Boer, J. Ranft, J.E. Hirsch, M. Beccaria, M. Beccaria, M. Beccaria, M. Beccaria, M. Beccaria, Massimo Campostrini, Matteo Beccaria, P.W. Anderson, R. Tarrach, S. Elitzur, S. Elitzur, T. Wittmann, Z. Szabó   +22 more
core   +1 more source

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, J. Zinn-Justin, Leonardo Spanu, Sandro Sorella   +3 more
core   +1 more source