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Hittade 11 dokument
A Wideband QuadRidge Flared Horn Feed Design for the Square Kilometre Array Band 1
Flygare, Jonas
Examensarbete på avancerad nivå, 2016 (MSc  Fundamental Physics)
The vast and unimaginable greatness of the universe will never stop to amaze ushumans. A strive to know, explore or just to grasp the concept of space will alwaysdrive us, both philosophically and technically. As a result of this, the visions andadvances in radio astronomy for the foreseeable future are very optimistic and a significantpart of this will be r...
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Neutron detection with the Miniball germanium array
Andersson, Daniel
Examensarbete på avancerad nivå, 2015 (MSc  Fundamental Physics)
In experiment IS430 at RexIsolde, Cern, transfer reactions of neutronrich beryllium isotopes on deuterated targets were studied with the segmented germanium detector arrayMiniball, detecting electromagnetic radiation, and the siliconbased TRex detector for charged particles. This thesis investigates signals in Miniball following inelastic scattering of n...
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A Tensor Formalism for Exceptional Geometry
Edlund, Joakim
Examensarbete på avancerad nivå, 2014 (MSc  Fundamental Physics)
Toroidal compactification of Mtheory and its low energy limit, elevendimensional supergravity, possess hidden symmetries giving fields additional degrees of freedom. Byextending the spacetime to accomodate these extra degrees of freedom and constructing a generalised geometry on this space, the Uduality symmetry can be made manifest. The local diffeomorp...
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Eisenstein Series and Instantons in String Theory
Gustafsson, Henrik P. A.
Examensarbete på avancerad nivå, 2013 (MSc  Fundamental Physics)
In this thesis we review Uduality constraints on corrections to the type IIB supergravityeffective action on torus compactifications. The Uduality invariant corrections are described by automorphic forms whose construction and Fourier expansion we explain. The latter enables us to extract physical information about instanton states in the theory. In partic...
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Optimised Use of Detector Systems for Relativistic Radioactive Beams
Lindberg, Simon
Examensarbete på avancerad nivå, 2013 (MSc  Fundamental Physics)
Ever since the discovery of the atomic nucleus, the exploration and understanding of its properties has been a frontier of physics research. Such investigations are still ongoing at different research facilities around the world. One of these places is the GSI accelerator laboratory where experiments with unstable heavy ions are performed. To obtain highqua...
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Supersymmetric Gauge Theory, WallCrossing and Hyperkähler Geometry
Till, Oskar
Examensarbete på avancerad nivå, 2013 (MSc  Fundamental Physics)
In this thesis we study moduli spaces of fourdimensional N = 2 supersymmetric gauge theories. We focus on the vector multiplet moduli space and describe how the rigid special geometry of the Coulomb branch determines the couplings in the effective Lagrangian. Compactication to three dimensions gives rise to an N = 4 theory whose moduli space is hyperkähler....
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Data Analysis of Resonant Proton Scattering in Inverse Kinematics
Strannerdahl, Fredrik
Examensarbete på avancerad nivå, 2013 (MSc  Fundamental Physics)
This thesis aims to study a resonant proton scattering experiment performed at CERNISOLDE,Geneva, during the summer of 2012. The main focus is detector calibration,data analysis and interpretation of the experimental data.A radioactive beam of 21Na at 3 MeV/u was impinging on a 5.6 mg/cm2 polyethylene,(CH2)n, target in vacuum. Ejectile protons from nuclear r...
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Holographic Superconductivity
Wenger, Tobias
Examensarbete på avancerad nivå, 2012 (MSc  Fundamental Physics)
In this thesis we apply the AdS/CFT conjecture to condensed matter physics and more specifically we consider the application to layered superconductors. In this thesis we apply the AdS/CFT conjecture to condensed matter physics and more specifically we consider the application to layered superconductors. We start by analysing the "ordinary" 2+1 dimensional h...
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Chiral Perturbation Theory,Weak Interactions and the Nuclear Twobody Axial Vector Current
Karlsson, Jonathan
Examensarbete på avancerad nivå, 2012 (MSc  Fundamental Physics)
In this thesis I give a practical introduction to chiral perturbation theory. This is an effective field theory of pions and nucleons. It is governed by the chiral symmetry stemming from the lightness of the up and down quarks in quantum chromodynamics. The validity region comprises energies up to the rho meson mass. The theory is expressed as an infinite s...
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Majorana Fermions in Topological Quantum Matter
Laurell, Pontus
Examensarbete på avancerad nivå, 2012 (MSc  Fundamental Physics)
Twodimensional topological insulators coupled to swave superconductors and external magnetic fields have been predicted to support Majorana edge states. The stability of these states against electronelectron interactions and spinorbit interactions of Rashba and Dresselhaus type are studied using bosonization and renormalization group analysis.To extend a...
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The Similarity Renormalization Group for three bosons in a momentumspace partialwave basis
Carlsson, Boris
Examensarbete på avancerad nivå, 2012 (MSc  Fundamental Physics)
The Similarity Renormalization Group (SRG) flow equation is explored for systems of two and three spinless bosons in a momentumspace partialwave basis. The two and threebody binding energies as well as the phaseshifts are used to gauge that the transformation is unitary and to study how well the SRG decouples high and lowenergy physics. I consider four...
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