Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 15 of 15 for “"Jastrow"”.
-
Variational theory of quantum fluids
… other many-body theories including the simpler Jastrow variational method. Differential equations are derived to calculate the correlation operator and the related Jastrow correlation"" function. A comparison of results in several Bose systems with various methods is given. The Fermi hypernetted …
-
Improved wave functions for quantum Monte Carlo
… and fits to this form are performed. Typical Jastrow factors used in quantum Monte Carlo calculations comprise electron-electron, electron-nucleus and electron-electron-nucleus terms. A general Jastrow factor capable of correlating an arbitrary of number of electrons and nuclei, and including …
-
A quantum Monte Carlo study of the two-dimensional electron gas
… and fixed-node energies over the Slater-Jastrow results which consider only two-body correlations. It is found that the backflow effect is dominant over the three-body effect at high density ($r\sb{s} \sim 1)$ while they are of equal importance at the lowest density considered $(r\sb{s} …
-
Quantum Monte Carlo Study of Hydrogen Adsorption on Carbon and Transition Metal Systems
… has already been published, tests the Slater-Jastrow (SJ) trial function against a more highly correlated Geminal trial function. The Slater-Jastrow form used here is shown to perform equivalently in measuring the small energy differences associated with physisorption. A series of tests is …
-
A calculation of the ground-state energy of liquid Helium II
… The trial wave function was assumed to be of the Jastrow type with two parameters. The value of one of the parameters was chosen to satisfy a liquid-structure-factor consistency condition. The expectation value for the ground state energy is expressed in terms of a generalized normalization …
-
Theory of Alpha-Nucleus Collisions at High Energies
… correlations in nuclear scattering. The Jastrow method is used to model the two-particle density for <sup>4</sup>He and to construct one and two particle form factors. Excellent agreement with experimental data for angular distributions, and total and reaction cross sections is found. The …
-
A study to discover color preference in preschool children
… in part and disagree entirely at some points. Jastrow found that boys preferred blue and girls preferred red, whereas Grath states almost the reverse, that boys preferred red more than girls, and that girls preferred orange more than boys. Fiege reports that boys preferred black and brown more …
-
A variational theory of nuclear matter
… with the choice of wave function. A generalized Jastrow product of two-body correlation functions containing central, spin, isospin, tensor, and spin-orbit operators is used. The correlation function is generated by a series of two-body Schrodinger equations with boundary conditions which require …
-
Lie algebraic similarity transformations: improving wavefunctions for weak and strong correlations
… The Hausdorff series generated by these Jastrow factors can be summed exactly without truncation resulting in a set of equations with polynomial computational cost. The correlators include the density-density, collinear spin-spin, spin-density cross terms, and on-site double occupancy …
-
Interacting Fermi Gases
… atomic gas experiments, and a new form of Jastrow correlation factor that interpolates between the radial symmetry of the inter-electron Coulomb potential at short inter-particle distances, and the symmetry of the numerical simulation cell at large separation. These methods are designed …
-
Spin Polarization of Ground State Electron Gas at Low Densities
… Random Phase Approximation to derive two-body Jastrow correlation functions. We also include backflow and threebody correlations in the wavefunction, to get a better upper bound for the ground state energies at both variational and fixed-phase level. In order to reduce the finite size effect at …
-
Excited states and transition metal compounds with quantum Monte Carlo
… of the BP86/SB type, and optimization of Jastrow parameters in the framework of VMC variance minimization to obtain a suitable guide wave function. A careful adjustment of the pseudopotential evaluation and of the time steps was done to obtain reliable FN-DMC results that proved at least …
-
Properties of rotating ultracold bosonic quantum gases
… trap can be described in terms of bosonic Jastrow correlations. We then generalize this result to study the effects of such correlations on a mean-field vortex lattice state and show that the included correlations lower the energy below that of the mean-field state. Although the reduction …
-
AB-INITIO DYNAMICS IN STRONGLY INTERACTING MANY-BODY SYSTEMS
… ones yielded by other popular Ansatzë, like the Jastrow wave function or the restricted Boltzmann machine (RBM), the latter being a particular case of NNQS. We find that the BSWF achieves a description of the one-dimensional (1D) TFI ground state which is competitive with the …
-
Quantum Monte Carlo Calculations of the Electronic excitations of GE atoms, molecules and Nanoclusters Using Core-polarization Potentials
Made available in DSpace on 2012-11-11T17:34:22Z (GMT). No. of bitstreams: 1 Vincent_Jordan.pdf: 1813578 bytes, checksum: 000c75ebbdce02ae4ef0a1b33bfd67e6 (MD5) Previous issue date: 2001