Department of Mathematics and Physics (TN-IMF): Nye registreringer
Viser treff 61-80 av 294
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A study of inhomogeneous massless scalar gauge fields in cosmology
(Peer reviewed; Journal article, 2022)Why is the Universe so homogeneous and isotropic? We summarize a general study of a γ-law perfect fluid alongside an inhomogeneous, massless scalar gauge field (with homogeneous gradient) in anisotropic spaces with General ... -
Skeletons, Object Shape, Statistics
(Peer reviewed; Journal article, 2022)Objects and object complexes in 3D, as well as those in 2D, have many possible representations. Among them skeletal representations have special advantages and some limitations. For the special form of skeletal representation ... -
In-medium kinetic theory of D mesons and heavy-flavor transport coefficients
(Peer reviewed; Journal article, 2022)We extend the kinetic theory of D mesons to accommodate thermal and off-shell effects due to the medium modification of the heavy-meson spectral functions. From the Kadanoff-Baym approach we derive the off-shell Fokker-Planck ... -
Functorially finite hearts, simple-minded systems in negative cluster categories, and noncrossing partitions
(Peer reviewed; Journal article, 2022)Let Q be an acyclic quiver and w 1 be an integer. Let C−w(kQ) be the (−w)-cluster category of kQ. We show that there is a bijection between simple-minded collections in Db(kQ) lying in a fundamental domain of C−w(kQ) and ... -
Towards dielectric relaxation at a single molecule scale
(Peer reviewed; Journal article, 2022)Dielectric relaxation lies at the heart of well-established techniques of dielectric spectroscopy essential to diverse fields of research and technology. We report an experimental route for increasing the sensitivity of ... -
Bridgeland Stability Conditions and the Hilbert Scheme of Skew Lines in Projective Space
(PhD thesis UiS;, Doctoral thesis, 2023-03)Bridgeland stability conditions are powerful tools for studying derived categories, with several applications to algebraic geometry. They were introduced by Bridgeland in 2002 [Bri07], who was motivated by Douglas’ work ... -
Cold quark matter at N3LO: Soft contributions
(Peer reviewed; Journal article, 2021)High-order perturbative calculations for thermodynamic quantities in QCD are complicated by the physics of dynamical screening that affects the soft, long-wavelength modes of the system. Here, we provide details for the ... -
Heterotic quantum cohomology
(Peer reviewed; Journal article, 2022-11)It is believed, but not demonstrated, that the large radius massless spectrum of a heterotic string theory compactified to four-dimensional Minkowski space should obey equations that split into ‘F-terms’ and ‘D-terms’ in ... -
Second-Order PDEs in 3D with Einstein–Weyl Conformal Structure
(Peer reviewed; Journal article, 2021)Einstein–Weyl geometry is a triple (D,g,ω) where D is a symmetric connection, [g] is a conformal structure and ω is a covector such that ∙ connection D preserves the conformal class [g], that is, Dg=ωg ; ∙ trace-free part ... -
Properties of Paley–Wiener spaces: sampling sets, contractions, and geometry of the unit ball
(PhD thesis UiS;, Doctoral thesis, 2023-03)This Thesis is based on five papers, four of which are published and one has been submitted for publication. For convenience of the reader, we also include one chapter that contains a brief overview of the results, some ... -
Porous flow with diffuse interfaces
(Chapter, 2021)This chapter presents a model developed by the author, in publications dated from 2002 to 2016, on flow in porous media assuming diffuse interfaces. It contains five sections. Section 1 is an Introduction, tracing the ... -
Complex Analysis the Hard Way: a Measure Theoretical Approach
(Master thesis, 2023)In this thesis we present a sophisticated, non-standard treatment of complex analysis using modern tools from measure theory and advanced analysis. This approach opens the path to deep and powerful results, including the ... -
Estimating the Competitive Storage Model with Stochastic Trends in Commodity Prices
(Peer reviewed; Journal article, 2021)We propose a State-Space Model (SSM) for commodity prices that combines the competitive storage model with a stochastic trend. This approach fits into the economic rationality of storage decisions and adds to previous ... -
Predicting parton energy loss in small collision systems
(Peer reviewed; Journal article, 2021)Medium induced parton energy loss is not conclusively established either in very peripheral heavy-ion collisions or in proton-ion collisions. However, the standard interpretation of azimuthal momentum anisotropies in these ... -
New G2-conifolds in M-theory and their field theory interpretation
(Peer reviewed; Journal article, 2021)A recent theorem of Foscolo-Haskins-Nordström [1] which constructs complete G2-holonomy orbifolds from circle bundles over Calabi-Yau cones can be utilised to construct and investigate a large class of generalisations of ... -
Proper static potential in classical lattice gauge theory at finite T
(Peer reviewed; Journal article, 2021)We compute the proper real-time interaction potential between a static quark and antiquark in classical lattice gauge theory at finite temperature. Our central result is the determination of the screened real-part of this ... -
Geometric surfaces: An invariant characterization of spherically symmetric black hole horizons and wormhole throats
(Peer reviewed; Journal article, 2021)We consider a spherically symmetric line element which admits either a black hole geometry or a wormhole geometry and show that in both cases the apparent horizon or the wormhole throat is partially characterized by the ... -
Invariant characterization of Szekeres models with positive cosmological constant
(Peer reviewed; Journal article, 2022-07)We present an invariant characterization of black holes in the Szekeres spacetime with positive cosmological constant. In the formation of the black holes, we locate geometric horizons, and show that they coincide with the ... -
Symmetric teleparallel geometries
(Peer reviewed; Journal article, 2022)In teleparallel gravity and, in particular, in F(T) teleparallel gravity, there is a challenge in determining an appropriate (co-)frame and its corresponding spin connection to describe the geometry. Very often, the ‘proper’ ... -
Quantum corrections to slow-roll inflation: scalar and tensor modes
(Peer reviewed; Journal article, 2021)Inflation is often described through the dynamics of a scalar field, slow-rolling in a suitable potential. Ultimately, this inflaton must be identified with the expectation value of a quantum field, evolving in a quantum ...