Uppsala University

researchers with a paper here

Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.

collaborating institutions

Showing 2002Show all

111 papers · 1 filter

cond-mat.mtrl-sci2002★ 38 cited

Effect of annealing on carrier density and Curie temperature in epitaxial (Ga,Mn)As thin films

B. Sorensen, J. Sadowski, R. Mathieu +2

We report a clear correspondence between changes in the Curie temperature and carrier density upon annealing in epitaxially grown (Ga,Mn)As layers with thicknesses in the range bet…

astro-ph2002★ 9 cited

Constraining the Cosmological Density of Compact Objects with the Long-Term Variability of Quasars

Erik Zackrisson, Nils Bergvall

By comparing the results from numerical microlensing simulations to the observed long-term variability of quasars, strong upper limits on the cosmological density of compact object…

hep-th2002★ 3 cited

Chirality and fermion number in a knotted soliton background

Lisa Freyhult, Antti J. Niemi

We consider the coupling of a single Dirac fermion to the three component unit vector field which appears as an order parameter in the Faddeev model. Classically, the coupling is d…

quant-ph2002★ 64 cited

Parity Effects in Spin Decoherence

A. Melikidze, V. V. Dobrovitski, H. A. De Raedt +2

We demonstrate that decoherence of many-spin systems can drastically differ from decoherence of single-spin systems. The difference originates at the most basic level, being determ…

hep-th2002★ 36 cited

Comparing strings in AdS(5)xS(5) to planar diagrams: an example

V. Pestun, K. Zarembo

The correlator of a Wilson loop with a local operator in N=4 SYM theory can be represented by a string amplitude in AdS(5)xS(5). This amplitude describes an overlap of the boundary…

hep-th2002★ 1.5k cited

The Bethe-Ansatz for N=4 Super Yang-Mills

J. A. Minahan, K. Zarembo

We derive the one loop mixing matrix for anomalous dimensions in N=4 Super Yang-Mills. We show that this matrix can be identified with the Hamiltonian of an integrable SO(6) spin c…

hep-th2002★ 33 cited

D-branes in N=2 WZW models

Ulf Lindstrom, Maxim Zabzine

We briefly review the construction of N=2 WZW models in terms of Manin triples. We analyse the restrictions which should be imposed on the gluing conditions of the affine currents…

hep-ph2002★ 12 cited

Diffractive Higgs bosons and prompt photons at hadron colliders

R. Enberg, G. Ingelman, N. Timneanu

Models for soft color interactions have been successful in describing and predicting diffractive hard scattering processes in ep collisions at DESY HERA and ppbar at the Fermilab T…

astro-ph2002★ 4 cited

Physics and Operation of the AMANDA-II High Energy Neutrino Telescope

Steven W. Barwick

This paper briefly describes the principle of operation and science goals of the AMANDA high energy neutrino telescope located at the South Pole, Antarctica. Results from an earlie…

hep-th2002★ 29 cited

Superspace Formulation of 4D Higher Spin Gauge Theory

J. Engquist, E. Sezgin, P. Sundell

Interacting AdS_4 higher spin gauge theories with N \geq 1 supersymmetry so far have been formulated as constrained systems of differential forms living in a twistor extension of 4…

astro-ph2002★ 22 cited

Three-component modeling of C-rich AGB star winds I. Method and first results

C. Sandin, S. Hoefner

Radiative acceleration of newly-formed dust grains and transfer of momentum from the dust to the gas plays an important role for driving winds of AGB stars. Therefore a detailed de…

astro-ph2002★ 134 cited

Stellar Archaeology: a Keck Pilot Program on Extremely Metal- Poor Stars From the Hamburg/ESO Survey. III. The Lead (Pb) Star HE 0024-2523

Sara Lucatello, Raffaele Gratton, Judith G. Cohen +4

We present a detailed abundance analysis, including spectral syntheses, of a very metal-poor ([Fe/H]= -2.7), peculiar main sequence star, HE0024-2523 detected during the course of…

quant-ph2002★ 25 cited

Uhlmann's geometric phase in presence of isotropic decoherence

Jonas Tidström, Erik Sjöqvist

Uhlmann's mixed state geometric phase [Rep. Math. Phys. {\bf 24}, 229 (1986)] is analyzed in the case of a qubit affected by isotropic decoherence treated in the Markovian approxim…

hep-th2002★ 71 cited

Can MAP and Planck map Planck physics?

L. Bergstrom, U. H. Danielsson

We investigate whether a recently proposed modulation of the power spectrum of primordial density fluctuations generated through transplankian (maybe stringy) effects during inflat…

astro-ph2002★ 34 cited

Andreev-Bashkin effect and knot solitons in interacting mixture of a charged and a neutral superfuids with possible releveance for neutron stars

Egor Babaev

We discuss a mixture of interacting a neutral and a charged Bose condensates, which is supposed being realized in interior of neutron stars in form of coexistent neutron superfluid…

cond-mat.supr-con2002★ 49 cited

First-principles Calculation of Superconductivity in Hole-doped LiBC: $T_{c} = 65$ K

J. K. Dewhurst, S. Sharma, C. Ambrosch-Draxl +1

The lattice dynamical properties of Li $_{x}$ BC are calculated for several values of $x$ using density functional perturbation theory. We find that the electron-phonon coupling parame…

cond-mat.mtrl-sci2002★ 57 cited

Effect of the Surface on the Electron Quantum Size Levels and Electron g-Factor in Spherical Semiconductor Nanocrystals

A. V. Rodina, Al. L. Efros, A. Yu. Alekseev

The structure of the electron quantum size levels in spherical nanocrystals is studied in the framework of an eight--band effective mass model at zero and weak magnetic fields. The…

cond-mat.mtrl-sci2002★ 66 cited

First-principles calculations of spin spirals in Ni2MnGa and Ni2MnAl

J. Enkovaara, A. Ayuela, J. Jalkanen +2

We report here non-collinear magnetic configurations in the Heusler alloys Ni2MnGa and Ni2MnAl which are interesting in the context of the magnetic shape memory effect. The total e…

hep-th2002★ 32 cited

Miracles and complementarity in de Sitter space

Ulf H. Danielsson, Daniel Domert, Martin Olsson

In this paper we consider a scenario, consisting of a de Sitter phase followed by a phase described by a scale factor $a (t) \sim t^{q}$ , where $1/3 < q < 1$ , which can be viewed as an i…

hep-th2002★ 103 cited

On the consistency of de Sitter vacua

Ulf H. Danielsson

In this paper the consistency of the de Sitter invariant $α$ -vacua, which have been introduced as simple tools to study the effects of transplanckian physics, is investigated. In p…

hep-th2002★ 52 cited

Open string fluctuations in AdS_5xS^5 and operators with large R-charge

K. Zarembo

A semiclassical string description is given for correlators of Wilson loops with local operators in N=4 SYM theory in the regime when operators carry parametrically large R-charge.…

cond-mat.supr-con2002★ 2 cited

The microscopic theory of superfluid $^{4}$ He

J. X. Zheng-Johansson, B. Johansson, P-I. Johansson

We present a microscopic theory of superfluid $^{4}$ He, formulated using the overall experimental observations as input information. With the theory of a consistent basis, we answer…

quant-ph2002★ 1 cited

Precession and interference in the Aharonov-Casher and scalar Aharonov-Bohm effect

Philipp Hyllus, Erik Sjöqvist

The ideal scalar Aharonov-Bohm (SAB) and Aharonov-Casher (AC) effect involve a magnetic dipole pointing in a certain fixed direction: along a purely time dependent magnetic field i…