Results 1  10
of
586
COMMUNICATIONS Vibrational gd dielectric properties of CeO from densityfunctional perturbation theory
"... The vibrational frequencies and electric polarizability of the C6a molecule, both in the gaseous and in the solid phases, are calculated from first principles ,using densityfunctional perturbation theory. This method also allows us to obtain the infrared and Raman activities which had never been c ..."
Abstract
 Add to MetaCart
The vibrational frequencies and electric polarizability of the C6a molecule, both in the gaseous and in the solid phases, are calculated from first principles ,using densityfunctional perturbation theory. This method also allows us to obtain the infrared and Raman activities which had never been
Densityfunctional calculation for K lattices in condensed phase and quantumchemical model for the cohesive energy of heavy alkali metals
"... Following a summary of deductions from experiment on the bonding of Rb and Cs in very different liquid and solid environments, energy calculations based on densityfunctional theory ͑DFT͒ are presented on ordered chains of K as a function of nearestneighbor distances. At a given bond length, and s ..."
Abstract
 Add to MetaCart
Following a summary of deductions from experiment on the bonding of Rb and Cs in very different liquid and solid environments, energy calculations based on densityfunctional theory ͑DFT͒ are presented on ordered chains of K as a function of nearestneighbor distances. At a given bond length
Coil sensitivity encoding for fast MRI. In:
 Proceedings of the ISMRM 6th Annual Meeting,
, 1998
"... New theoretical and practical concepts are presented for considerably enhancing the performance of magnetic resonance imaging (MRI) by means of arrays of multiple receiver coils. Sensitivity encoding (SENSE) is based on the fact that receiver sensitivity generally has an encoding effect complementa ..."
Abstract

Cited by 193 (3 self)
 Add to MetaCart
configurations and kspace sampling patterns. Special attention is given to the currently most practical case, namely, sampling a common Cartesian grid with reduced density. For this case the feasibility of the proposed methods was verified both in vitro and in vivo. Scan time was reduced to onehalf using a two
RealTime Dynamics with Fermions on a Lattice
, 2008
"... The 1 + 1 dimensional abelian Higgs model with fermions is a toy model for the theory of electroweak baryogenesis. We study the dynamics of the model with axially coupled fermions in realtime. The model is defined on a spacetime lattice to preserve gauge invariance and to obtain numerical stability ..."
Abstract
 Add to MetaCart
The 1 + 1 dimensional abelian Higgs model with fermions is a toy model for the theory of electroweak baryogenesis. We study the dynamics of the model with axially coupled fermions in realtime. The model is defined on a spacetime lattice to preserve gauge invariance and to obtain numerical
Perturbation theory reloaded: analytical calculation of nonlinearity in baryonic oscillations in the real space matter power spectrum, Astrophys.J. 651
, 2006
"... We compare the nonlinear matter power spectrum in real space calculated analytically from thirdorder perturbation theory with Nbody simulations at 1 < z < 6. We find that the perturbation theory prediction agrees with the simulations to better than 1 % accuracy in the weakly nonlinear regime ..."
Abstract

Cited by 15 (0 self)
 Add to MetaCart
the conventional approaches based on empirical fitting functions to simulations. Future work should include perturbation theory calculations of nonlinearity in redshiftspace distortion and halo biasing in the weakly nonlinear regime. Subject headinggs: cosmology: theory — largescale structure of universe Online
Accurate ionic forces and geometry optimization in linearscaling densityfunctional theory with local orbitals
, 2011
"... Linear scaling methods for densityfunctional theory (DFT) simulations are formulated in terms of localized orbitals in real space, rather than the delocalized eigenstates of conventional approaches. In localorbital methods, relative to conventional DFT, desirable properties can be lost to some ex ..."
Abstract
 Add to MetaCart
Linear scaling methods for densityfunctional theory (DFT) simulations are formulated in terms of localized orbitals in real space, rather than the delocalized eigenstates of conventional approaches. In localorbital methods, relative to conventional DFT, desirable properties can be lost to some
Nf = 2 Lattice QCD and Chiral Perturbation Theory
, 2005
"... By employing a twisted mass term, we compare recent results from lattice calculations of Nf = 2 dynamical Wilson fermions with Wilson Chiral Perturbation Theory (WChPT). The final goal is to determine some combinations of GasserLeutwyler Low Energy Constants (LECs). A wide set of data with differen ..."
Abstract
 Add to MetaCart
By employing a twisted mass term, we compare recent results from lattice calculations of Nf = 2 dynamical Wilson fermions with Wilson Chiral Perturbation Theory (WChPT). The final goal is to determine some combinations of GasserLeutwyler Low Energy Constants (LECs). A wide set of data
Convergence of chiral perturbation theory in dynamical lattice QCD with exact chiral symmetry
, 2009
"... We present our recent lattice calculation with dynamical quarks using the overlap fermion formulation, which has exact chiral symmetry. It is possible to compare our data of meson mass and decay constant with the prediction from the chiral perturbation theory. From such comparison, we investigate th ..."
Abstract
 Add to MetaCart
We present our recent lattice calculation with dynamical quarks using the overlap fermion formulation, which has exact chiral symmetry. It is possible to compare our data of meson mass and decay constant with the prediction from the chiral perturbation theory. From such comparison, we investigate
Diagrammatic perturbation theory and the pseudogap
, 2003
"... We study a model of quasiparticles on a twodimensional square lattice coupled to Gaussian distributed dynamical molecular fields. We consider two types of such fields, a vector molecular field that couples to the quasiparticle spindensity and a scalar field coupled to the quasiparticle number dens ..."
Abstract
 Add to MetaCart
density. The model describes quasiparticles coupled to spin or charge fluctuations, and is solved by a Monte Carlo sampling of the molecular field distributions. The nonperturbative solution is compared to various approximations based on diagrammatic perturbation theory. When the molecular field
Numerical aspects of realspace approaches to strong eld electron dynamics
"... Numerical methods for calculating strongeld, nonperturbative electron dynamics are investigated. Two dierent quantummechanical approaches are discussed: the timedependent Schrodinger equation and timedependent density functional theory. We show that when solving the timedependent Schrodinger e ..."
Abstract
 Add to MetaCart
Numerical methods for calculating strongeld, nonperturbative electron dynamics are investigated. Two dierent quantummechanical approaches are discussed: the timedependent Schrodinger equation and timedependent density functional theory. We show that when solving the timedependent Schrodinger
Results 1  10
of
586