3.1k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- University of OsloNO153 papers
- Centre National de la Recherche ScientifiqueFR139 papers
- KTH Royal Institute of TechnologySE92 papers
- SINTEFNO92 papers
- Johannes Gutenberg University MainzDE57 papers
- Delft University of TechnologyNL56 papers
- University of CopenhagenDK55 papers
- ETH ZurichCH46 papers
- Tomsk State Pedagogical UniversityRU44 papers
- University of CambridgeGB41 papers
- Stockholm UniversitySE40 papers
- Eindhoven University of TechnologyNL38 papers
20 papers · 1 filter
Epsilon-expansion in quantum field theory in curved spacetime
I. H. Brevik, H. Ocampo, S. D. Odintsov
We discuss epsilon-expansion in curved spacetime for asymptotically free and asymptotically non-free theories. The esistence of stable and unstable fixed points is investigated for…
Phase-coherence and the boson-analogy of vortex liquids
A. K. Nguyen, A. Sudbø
The statistical mechanics of the flux-line lattice in extreme type-II super- conductors is studied within the framework of the uniformly frustrated anisotropic 3D XY-model. A finit…
Zeta-function regularization and the thermodynamic potential for quantum fields in symmetric spaces
I. Brevik, A. A. Bytsenko, A. E. Goncalves +1
We calculate a temperature dependent part of the one-loop thermodynamic potential (and the free energy) for charged massive fields in a general class of irreducible rank 1 symmetri…
The fourth virial coefficient of anyons
Anders Kristoffersen, Stefan Mashkevich, Jan Myrheim +1
We have computed by a Monte Carlo method the fourth virial coefficient of free anyons, as a function of the statistics angle theta. It can be fitted by a four term Fourier series,…
Direct mode summation for the Casimir energy of a solid ball
I. H. Brevik, V. V. Nesterenko, I. G. Pirozhenko
The Casimir energy of a solid ball placed in an infinite medium is calculated by a direct frequency summation using the contour integration. It is assumed that the permittivity and…
Thermodynamics of superconducting lattice fermions
E. Otnes, A. Sudbø
We consider the Cooper-problem on a lattice model including onsite and near-neighbor interactions. Expanding the interaction in basis functions for the irreducible representation f…
Fracture in Three-Dimensional Fuse Networks
G. George Batrouni, Alex Hansen
We report on large scale numerical simulations of fracture surfaces using random fuse networks for two very different disorders. There are some properties and exponents that are di…
Averaged Green function and density of states for electrons in a high magnetic field and random potential
A. Kristoffersen, K. Olaussen
We consider a model for 2D electrons in a very strong magnetic field (i.e. projected onto a single Landau level) and a random potential . The computation of the averaged Green f…
Determination of the Hurst Exponent by Use of Wavelet Transforms
Ingve Simonsen, Alex Hansen, Olav Magnar Nes
We propose a new method for (global) Hurst exponent determination based on wavelets. Using this method, we analyze synthetic data with predefined Hurst exponents, fracture surfaces…
Band Formation during Gaseous Diffusion in Aerogels
M. A. Einarsrud, F. A. Maao, A. Hansen +2
We study experimentally how gaseous HCl and NH_3 diffuse from opposite sides of and react in silica aerogel rods with porosity of 92 % and average pore size of about 50 nm. The rea…
A two-dimensional network simulator for two-phase flow in porous media
Eyvind Aker, Knut Jorgen Maloy, Alex Hansen +1
We investigate a two-dimensional network simulator capable of modeling different time dependencies in two-phase drainage displacements. In particular, we focus on the temporal evol…
Onsager Loop-Transition and First Order Flux-Line Lattice Melting in High- Superconductors
A. K. Nguyen, A. Sudbø
Monte-Carlo simulations in conjunction with finite-size scaling analysis are used to investigate the -phase diagram in uniaxial anisotropic high- superconductors, both…
On the Casimir energy for a 2N-piece relativistic string
I. Brevik, R. Sollie
The Casimir energy for the transverse oscillations of a piecewise uniform closed string is calculated. The string consists of 2N pieces of equal length, of alternating type I and t…
Burst avalanches in solvable models of fibrous materials
M. Kloster, A. Hansen, P. C. Hemmer
We review limiting models for fracture in bundles of fibers, with statistically distributed thresholds for breakdown of individual fibers. During the breakdown process, avalanches…
Light scattering from a periodically modulated two dimensional electron gas with partially filled Landau levels
Arne Brataas, C. Zhang, K. A. Chao
We study light scattering from a periodically modulated two dimensional electron gas in a perpendicular magnetic field. If a subband is partially filled, the imaginary part of the…
Acoustoelectric effects in quantum constrictions
Frank A. Maao, Y. Galperin
A dc current induced in a quantum constriction by a traveling acoustic wave (or by non-equilibrium ballistic phonons) is considered. We show that in many important situations the e…
Criticality in the Integer Quantum Hall Effect
Alex Hansen, E. H. Hauge, Joakim Hove +1
We review some elementary aspects of the critical properties of the series of metal-insulator transitions that constitute the integer quantum Hall effect. Numerical work has proven…
Thermodynamic Properties of the Piecewise Uniform String
I. Brevik, A. A. Bytsenko, H. B. Nielsen
The thermodynamic free energy F is calculated for a gas whose particles are the quantum excitations of a piecewise uniform bosonic string. The string consists of two parts of lengt…
Spin-density and charge-density excitations in quantum wires
Arne Brataas, A. G. Mal'hukov, Christoph Steinebach +2
We study an interacting electron gas in a quantum wire within the Hartree-Fock random phase approximation. Vertex corrections to the electron spin polarizability due to the electro…
Algebra of Observables for Identical Particles in One Dimension
Serguei B. Isakov, Jon Magne Leinaas, Jan Myrheim +2
The algebra of observables for identical particles on a line is formulated starting from postulated basic commutation relations. A realization of this algebra in the Calogero model…