Blar i Department of Mathematics and Physics (TN-IMF) på emneord "VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430"
Viser treff 61-80 av 89
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Quantum tunnelling, real-time dynamics and Picard-Lefschetz thimbles
(Peer reviewed; Journal article, 2019-11)We follow up the work, where in light of the Picard-Lefschetz thimble approach, we split up the real-time path integral into two parts: the initial density matrix part which can be represented via an ensemble of initial ... -
Quarkonium phenomenology from a generalised Gauss law
(Peer reviewed; Journal article, 2019-05)We present an improved analytic parametrisation of the complex in-medium heavy quark potential derived rigorously from the generalised Gauss law. To this end we combine in a self-consistent manner a non-perturbative vacuum ... -
Real-Time Complex Langevin - A Differential Programming Perspective
(PhD thesis UiS;, Doctoral thesis, 2023)In this thesis, I aim to find solutions to the NP-hard sign-problem that arises when modeling strongly correlated systems in real-time. I will use the complex Langevin (CLE) method, and address its problem of runaway ... -
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 ... -
Signal analysis in gravitational wave data
(PhD thesis UiS;, Doctoral thesis, 2024)In this thesis, I study the gravitational wave signals coming from compact objects on both present-stage, and future gravitational wave detectors. The thesis is based on 3 articles, which will be presented after two brief ... -
Simulations of a bubble wall interacting with an electroweak plasma
(Peer reviewed; Journal article, 2021-02)We perform large-scale real-time simulations of a bubble wall sweeping through an out-of-equilibrium plasma. The scenario we have in mind is the electroweak phase transition, which may be first order in extensions of the ... -
Soft Interactions in Cold Quark Matter
(Peer reviewed; Journal article, 2021-10)Accurate knowledge of the thermodynamic properties of zero-temperature, high-density quark matter plays an integral role in attempts to constrain the behavior of the dense QCD matter found inside neutron-star cores, ... -
Soft photon propagation in a hot and dense medium to next-to-leading order
(Peer reviewed; Journal article, 2023)We present the first complete calculation of the soft photon self-energy to the next-to-leading order in a hot and/or dense ultrarelativistic plasma in QED. The calculation is performed within the real-time formalism ... -
Stable solvers for real-time Complex Langevin
(Peer reviewed; Journal article, 2021-08)This study explores the potential of modern implicit solvers for stochastic partial differential equations in the simulation of real-time complex Langevin dynamics. Not only do these methods offer asymptotic stability, ... -
Statistics on Lefschetz thimbles: Bell/Leggett-Garg inequalities and the classical-statistical approximation
(Peer reviewed; Journal article, 2021)Inspired by Lefschetz thimble theory, we treat Quantum Field Theory as a statistical theory with a complex Probability Distribution Function (PDF). Such complex-valued PDFs permit the violation of Bell-type inequalities, ... -
Stochastic gravitational wave background from stellar origin binary black holes in LISA
(Peer reviewed; Journal article, 2023)We use the latest constraints on the population of stellar origin binary black holes (SOBBH) from LIGO/Virgo/KAGRA (LVK) observations, to estimate the stochastic gravitational wave background (SGWB) they generate in the ... -
Stochastic inflation from quantum field theory and the parametric dependence of the effective noise amplitude
(Peer reviewed; Journal article, 2022-02)The non-linear dynamics of long-wavelength cosmological fluctuations may be phrased in terms of an effective classical, but stochastic evolution equation. The stochastic noise represents short-wavelength modes that continually ... -
Symmetry and Equivalence in Teleparallel Gravity
(Peer reviewed; Journal article, 2020-07)In theories such as teleparallel gravity and its extensions, the frame basis replaces the metric tensor as the primary object of study. A choice of coordinate system, frame basis, and spin-connection must be made to obtain ... -
T3-invariant heterotic Hull-Strominger solutions
(Peer reviewed; Journal article, 2021-01)We consider the heterotic string on Calabi-Yau manifolds admitting a Strominger-Yau-Zaslow fibration. Upon reducing the system in the T3-directions, the Hermitian Yang-Mills conditions can then be reinterpreted as a complex ... -
Tales from Wonderland
(Doctoral thesis, 2020-06)Knowing that the Universe is quite isotropic, one may, as already discussed in Chapter 1, wonder how likely such a Universe is. We take the following research question. Question 1. Is the asymptotic future of a cosmology ... -
Thermalization and dynamical spectral properties in the quark-meson model
(Peer reviewed; Journal article, 2020-07)We investigate the nonequilibrium evolution of the quark-meson model using two-particle irreducible effective action techniques. Our numerical simulations, which include the full dynamics of the order parameter of chiral ... -
Thermalization of weakly coupled non-Abelian plasmas at next-to-leading order
(Peer reviewed; Journal article, 2023)We employ the QCD kinetic theory, including next-to-leading(NLO) order corrections in coupling constant, to study the evolution of weakly coupled non-Abelian plasmas towards thermal equilibrium. For two characteristic ... -
Thermodynamics of antiferromagnetic solids in magnetic fields
(Peer reviewed; Journal article, 2020)We analyze the thermodynamic properties of antiferromagnetic solids subjected to a combination of mutually orthogonal uniform magnetic and staggered fields. Low- temperature series for the pressure, order parameter and ... -
Thoughts about the utility of perturbative QCD in the cores of neutron stars – contribution to a roundtable discussion on neutron stars and QCD
(Peer reviewed; Journal article, 2022)In this contribution, I discuss the utility that perturbative QCD offers in studying the matter in the cores of neutron stars. I discuss the reasons why perturbative QCD can constrain the equation of state at densities far ... -
Topological G2 and Spin(7) strings at 1-loop from double complexes
(Peer reviewed; Journal article, 2022)We study the topological G2 and Spin(7) strings at 1-loop. We define new double complexes for supersymmetric NSNS backgrounds of string theory using generalised geometry. The 1-loop partition function then has a target-space ...