Browsing Department of Mathematics and Physics (TNIMF) by Issue Date
Now showing items 120 of 112

EPW Cubes
(Journal article; Peer reviewed, 201608)We construct a new 20dimensional family of projective sixdimensional irreducible holomorphic symplectic manifolds. The elements of this family are deformation equivalent with the Hilbert scheme of three points on a K3 ... 
Exact Solutions of the Field Equations for Empty Space in the Nash Gravitational Theory
(Journal article; Peer reviewed, 201702)John Nash has proposed a new theory of gravity. We define a Nashtensor equal to the curvature tensor appearing in the Nash field equations for empty space, and calculate its components for two cases: 1. A static, spherically ... 
On a class of integrable systems of MongeAmpère type
(Journal article; Peer reviewed, 201706)We investigate a class of multidimensional twocomponent systems of MongeAmpère type that can be viewed as generalisations of heavenly type equations appearing in a selfdual Ricciflat geometry. Based on the JordanKronecker ... 
Universal spacetimes in four dimensions
(Journal article; Peer reviewed, 201710)Universal spacetimes are exact solutions to all higherorder theories of gravity. We study these spacetimes in four dimensions and provide necessary and sufficient conditions for universality for all Petrov types except ... 
Anomalous lowtemperature thermodynamics of QCD in strong magnetic fields
(Journal article; Peer reviewed, 201711)The thermodynamics of quantum chromodynamics at low temperatures and in sufficiently strong magnetic fields is governed by neutral pions. We analyze the interacting system of neutral pions and photons at zero baryon chemical ... 
Value regions of univalent selfmaps with two boundary fixed points
(Journal article; Peer reviewed, 2018)In this paper we find the exact value region V(z0,T) of the point evaluation functional f → f(z0) over the class of all holomorphic injective selfmaps f : D → D of the unit disk D having a boundary regular fixed point at ... 
Scattering amplitudes of massive NambuGoldstone bosons
(Journal article; Peer reviewed, 201801)Massive NambuGoldstone (mNG) bosons are quasiparticles the gap of which is determined exactly by symmetry. They appear whenever a symmetry is broken spontaneously in the ground state of a quantum manybody system and at ... 
Chiral density wave versus pion condensation at finite density and zero temperature
(Journal article; Peer reviewed, 201804)The quarkmeson model is often used as a lowenergy effective model for QCD to study the chiral transition at finite temperature T, baryon chemical potential μB, and isospin chemical potential μI. We determine the parameters ... 
Lithiation of Silicon Carbide.
(Masteroppgave/UISTNIMF/2018;, Master thesis, 20180615)Nowadays, different material like: lithium, silicon, germanium and tin are under investigation as possible anode materials for Lithium ion batteries (LIBs.) The function of anode in LIB is to accommodate the lithium ion ... 
Atomic scattering factors and atomic crosssections in xray crystallography
(Masteroppgave/UISTNIMF/2018;, Master thesis, 20180615)Crystallographers as well as other scientists and engineers need reliable sets of physical data. Focus is here set upon the xray attenuation coefficients (the atomic photoeffect crosssection, and the incoherent (Compton) ... 
Charged FENEP nonnewtonian fluid model
(Masteroppgave/UISTNIMF/2018;, Master thesis, 20180615) 
Effect of additives, ball milling and isotopic exchange in porous magnesium borohydride
(Journal article; Peer reviewed, 201808)Magnesium borohydride (Mg(BH4)2) is a promising material for solid state hydrogen storage. However, the predicted reversible hydrogen sorption properties at moderate temperatures have not been reached due to sluggish ... 
Poncelet's Theorem
(Masteroppgave/UISTNIMF/2018;, Master thesis, 201810)This thesis will be concerned with different questions related to the theorem of Poncelet. We will study the historical background of the theorem and learn theory needed to understand two different proofs. 
Pion condensation and phase diagram in the Polyakovloop quarkmeson model
(Journal article; Peer reviewed, 201810)We use the Polyakovloop extended twoflavor quarkmeson model as a lowenergy effective model for QCD to study the phase diagram in the μI–T planewhere μI is the isospin chemical potential. In particular, we focus on the ... 
Nonperturbative analysis of the electroweak phase transition in the two Higgs doublet model
(Journal article; Peer reviewed, 201811)We perform a nonperturbative study of the electroweak phase transition (EWPT) in the two Higgs doublet model (2HDM) by deriving a dimensionally reduced hightemperature effective theory for the model, and matching to known ... 
Bottomonium suppression at RHIC and LHC
(Peer reviewed; Journal article, 201902)The strong suppression of heavy quarkonia is a good indicator that one has generated a quarkgluon plasma (QGP) in an ultrarelativistic heavy ion collision. Recent advancements in first principles calculations of the heavy ... 
Quantum dynamical dissociation of quarkonia by wave function decoherence in quarkgluon plasma
(Peer reviewed; Journal article, 201902)In this study, we investigate the realtime evolution of quarkonium bound states in a quarkgluon plasma in an improved QCD based stochastic potential model. This model describes the quarkonium dynamics in terms of a ... 
Matching the Nonequilibrium Initial Stage of Heavy Ion Collisions to Hydrodynamics with QCD Kinetic Theory
(Peer reviewed; Journal article, 201903)Highenergy nuclear collisions produce a nonequilibrium plasma of quarks and gluons which thermalizes and exhibits hydrodynamic flow. There are currently no practical frameworks to connect the early particle production in ... 
A Class of Tests for Trend in Time Censored Recurrent Event Data
(Journal article; Peer reviewed, 201904)Statistical tests for trend in recurrent event data not following a Poisson process are generally constructed for event censored data. However, time censored data are more frequently encountered in practice. In this paper ... 
Quarkonium phenomenology from a generalised Gauss law
(Peer reviewed; Journal article, 201905)We present an improved analytic parametrisation of the complex inmedium heavy quark potential derived rigorously from the generalised Gauss law. To this end we combine in a selfconsistent manner a nonperturbative vacuum ...