Zobrazeno 1 - 10
of 190
pro vyhledávání: '"Samuelsson Lars"'
Publikováno v:
Nordicom Review, Vol 41, Iss 2, Pp 179-193 (2020)
Users of digital media leave traces that corporations and authorities can harvest, systematise, and analyse; on the societal level, an overall result is the emergence of a surveillance culture. In this study, we examine how people handle the dilemma
Externí odkaz:
https://doaj.org/article/ea9d2761dfc84fd4a8896837b1eba6d4
Autor:
Samuelsson, Lars, Andersson, Nils
Publikováno v:
Class.Quant.Grav.26:155016,2009
We present the results of the first study of global oscillations of relativistic stars with both elastic crusts and interpenetrating superfluid components. For simplicity, we focus on the axial quasi-normal modes. Our results demonstrate that the tor
Externí odkaz:
http://arxiv.org/abs/0903.2437
Publikováno v:
Int.J.Mod.Phys.D18:429-434,2009
A new formulation of Carter's constant for geodesic motion in Kerr black holes is given. It is shown that Carter's constant corresponds to the total angular momentum plus a precisely defined part which is quadratic in the linear momenta. The characte
Externí odkaz:
http://arxiv.org/abs/0710.4260
Publikováno v:
Class.Quant.Grav.24:4147-4160,2007
In this paper we discuss a new approach to the quasinormal-mode problem in general relativity. By combining a characteristic formulation of the perturbation equations with the integration of a suitable phase-function for a complex valued radial coord
Externí odkaz:
http://arxiv.org/abs/0705.4585
Autor:
Karlovini, Max, Samuelsson, Lars
Publikováno v:
Class.Quant.Grav.24:3171-3190,2007
This is the fourth paper in a series that attempt to put forward a consistent framework for modelling solid regions in neutron stars. Here we turn our attention to axial perturbations of spherically symmetric spacetimes using a gauge invariant approa
Externí odkaz:
http://arxiv.org/abs/gr-qc/0703001
Autor:
Samuelsson, Lars, Andersson, Nils
Publikováno v:
Mon.Not.Roy.Astron.Soc.374:256-268,2007
Recent observations of quasi-periodic oscillations in the aftermath of giant flares in soft gamma-ray repeaters suggest a close coupling between the seismic motion of the crust after a major quake and the modes of oscillations in a magnetar. In this
Externí odkaz:
http://arxiv.org/abs/astro-ph/0609265
Publikováno v:
Mon.Not.Roy.Astron.Soc.Lett. 371 (2006) L74-L77
We use a simple toy-model to discuss global MHD modes of a neutron star, taking into account the magnetic coupling between the elastic crust and the fluid core. Our results suggest that the notion of pure torsional crust modes is not useful for the c
Externí odkaz:
http://arxiv.org/abs/astro-ph/0605461
Autor:
Carter, Brandon, Samuelsson, Lars
Publikováno v:
Class.Quant.Grav. 23 (2006) 5367-5388
At densities below the neutron drip threshold, a purely elastic solid model (including, if necessary, a frozen-in magnetic field) can provide an adequate description of a neutron star crust, but at higher densities it will be necessary to allow for t
Externí odkaz:
http://arxiv.org/abs/gr-qc/0605024
Autor:
Karlovini, Max, Samuelsson, Lars
Publikováno v:
Class.Quant.Grav. 21 (2004) 4531-4548
We present an equation of state for elastic matter which allows for purely longitudinal elastic waves in all propagation directions, not just principal directions. The speed of these waves is equal to the speed of light whereas the transversal type s
Externí odkaz:
http://arxiv.org/abs/gr-qc/0401115
Publikováno v:
Class.Quant.Grav. 21 (2004) 1559-1581
We study radial perturbations of general relativistic stars with elastic matter sources. We find that these perturbations are governed by a second order differential equation which, along with the boundary conditions, defines a Sturm-Liouville type p
Externí odkaz:
http://arxiv.org/abs/gr-qc/0309056