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70 papers · 1 filter
Quantal Two-Centre Coulomb Problem treated by means of the Phase-Integral Method II. Quantization Conditions in the Symmetric Case Expressed in Terms of Complete Elliptic Integrals. Numerical Illustration
N. Athavan, N. Fröman, M. Lakshmanan
The contour integrals, occurring in the arbitrary-order phase-integral quantization conditions given in a previous paper, are in the first- and third-order approximations expressed…
Quantal Two-Centre Coulomb Problem treated by means of the Phase-Integral Method III. Quantization Conditions in the General Case Expressed in Terms of Complete Elliptic Integrals. Numerical Illustration
N. Athavan, N. Fröman, M. Lakshmanan
In this paper we take up the quantal two-centre problem where the Coulomb centres have arbitrary positive charges. In analogy with the symmetric case, treated in the second paper o…
Quantal Two-Centre Coulomb Problem treated by means of the Phase-Integral Method I. General Theory
N. Athavan, P. O. Fröman, N. Fröman +1
The present paper concerns the derivation of phase-integral quantization conditions for the two-centre Coulomb problem under the assumption that the two Coulomb centres are fixed.…
Harmonic Twistor Formalism and Transgression on Hyperkähler manifolds
A. Gerasimov, A. Kotov
In this paper we continue our study of the fourth order transgression on hyperähler manifolds introduced in the previous paper. We give a local construction for the fourth-order tr…
Searching for physics beyond the Standard Model in the decay B+ -> K+K+pi-
J. Damet, P. Eerola, A. Manara +1
The observation potential of the decay B+ -> K+K+pi- with the ATLAS detector at LHC is described in this paper. In the Standard Model this decay mode is highly suppressed, while in…
Linearization of Poisson actions and singular values of matrix products
Anton Alekseev, Eckhard Meinrenken, Chris Woodward
We prove that the linearization functor from the category of Hamiltonian K-actions with group-valued moment maps in the sense of Lu, to the category of ordinary Hamiltonian K-actio…
The photon structure and exclusive production of vector mesons in gamma-gamma collisions
L. Motyka, B. Ziaja
The process of exclusive vector meson production (gamma gamma to J/psi rho^0) is studied for almost real photons. This process may be reduced to photoproduction of J/psi off the rh…
Aging Effect in Ceramic Superconductors
Mai Suan Li, Per Nordblad, Hikaru Kawamura
A three-dimensional lattice of the Josephson junctions with a finite self-conductance is employed to model ceramic superconductors. Using Monte Carlo simulations it is shown that t…
The Core-Wing Anomaly of Cool Ap Stars: Abnormal Balmer Profiles
Charles R. Cowley, S. Hubrig, T. A. Ryabchikova +3
Paper by Cowley et al. The Core-Wing Anomaly Etc. The profiles of H in a number of cool Ap stars are anomalous. Broad wings, indicative of temperatures in the range 7000-8000K e…
Gauge Fields and Fermions in Tachyon Effective Field Theories
Joseph A. Minahan, Barton Zwiebach
In this paper we incorporate gauge fields into the tachyon field theory models for unstable D-branes in bosonic and in Type II string theories. The chosen couplings yield massless…
Theory of Strongly Correlated Electron Systems. III. Including Correlation Effects into Electronic Structure Calculations
U. Lundin, I. Sandalov, O. Eriksson
In previous papers we showed that a division of the f-shell into two subsystems gives a better understanding of cohesive properties as well the general behavior of lanthanide syste…
Theory of strongly correlated f and d-electron systems. I. Exact Hamiltonian, Hubbard-Anderson models and perturbation theory near atomic limit within non-orthogonal basis set
Igor Sandalov, Borje Johansson, Olle Eriksson
The theory of correlated electron systems is formulated in a form which allows to use as a reference point an ab initio band structure theory (AIBST). The theory is constructed in…
The boron absorption line at 2089.6 AA in HD 140283 ?
P. Thoren, B. Edvardsson
We have observed the B I line at 2089.6 AA in the metal poor star HD 140283 with HST/STIS. The observation was an attempt to confirm the B abundances derived from the 2497 AA B I l…
Wound String Scattering in NCOS Theory
Fredric Kristiansson, Peter Rajan
We calculate the amplitude for a non-excited closed string with nonzero winding number to scatter from a D-string with a near critical E field. We go to the NCOS limit and observe…
Self-broadening in Balmer line wing formation in stellar atmospheres
P. S. Barklem, N. Piskunov, B. J. O'Mara
Details of a theory of self-broadening of hydrogen lines are presented. The main features of the new theory are that the dispersive-inductive components of the interaction (van der…
Theoretical description of the total gamma*gamma* cross-section and its confrontation with the LEP data on doubly tagged e+e- events
J. Kwiecinski, L. Motyka
We perform a detailed analysis of the total inelastic cross-section for gamma*gamma* collisions. Different contributions coming from the quark box diagram, reggeons, the soft and h…
Chemical abundances in cool metal rich disk dwarf stars
P. Thoren, S. Feltzing
The present study of spectra of twelve metal-rich cool dwarf stars, carefully selected in order to cover a range of temperatures (~4400 - 6000 K), is a follow up on Feltzing & Gust…
Production of isoscalar pion pairs in the pd -> 3He pi pi reaction near threshold
G. Faldt, A. Gardestig, C. Wilkin
The production near threshold of isoscalar pion pairs in the pd -> 3He(pi pi)^0 reaction is estimated in a two-step model which successfully describes the production of eta, omega…
Critical dynamics of an interacting magnetic nanoparticle system
M. F. Hansen, P. Jönsson, P. Nordblad +1
Effects of dipole-dipole interactions on the magnetic relaxation have been investigated for three Fe-C nanoparticle samples with volume concentrations of 0.06, 5 and 17 vol%. While…
Thermodynamics of Crossover from Weak- to Strong-Coupling Superconductivity
Egor Babaev
In this paper we study an evolution of low-temperature thermodynamical quantities for an electron gas with a -function attraction as the system crosses over from weak-coupling…
Effective Tachyon Dynamics in Superstring Theory
Joseph A. Minahan, Barton Zwiebach
A recently proposed \ell=\infty field theory model of tachyon dynamics for unstable bosonic D-branes has been shown to arise as the two-derivative truncation of (boundary)-string f…
The beryllium abundance in the very metal-poor halo star G 64-12 from VLT/UVES observations
F. Primas, M. Asplund, P. E. Nissen +1
We report on a new spectroscopic analysis of the very metal deficient star G 64-12 ([Fe/H]=-3.3), aimed at determining, for the first time, its Be content. The spectra were observe…
IIA/B, Wound and Wrapped
Ulf H. Danielsson, Alberto Guijosa, Martin Kruczenski
We examine the T-duality relation between 1+1 NCOS and the DLCQ limit of type IIA string theory. We show that, as long as there is a compact dimension, one can meaningfully define…
Shafranov's virial theorem and magnetic plasma confinement
Ludvig Faddeev, Lisa Freyhult, Antti J. Niemi +1
Shafranov's virial theorem implies that nontrivial magnetohydrodynamical equilibrium configurations must be supported by externally supplied currents. Here we extend the virial the…