Blar i Department of Mathematics and Physics (TN-IMF) på emneord "VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430"

Viser treff 41-60 av 89

    • Invariant characterization of Szekeres models with positive cosmological constant 

      McNutt, David Duncan; Coley, Alan; Layden, Nicolas (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 ...

    • An Invariant Characterization of the Levi-Civita Spacetimes 

      Watson, Cooper; Julius, William; Gorban, Matthew; McNutt, David Duncan; Davis, Eric; Cleaver, Gerald (Peer reviewed; Journal article, 2021-08)
      In the years 1917–1919 Tullio Levi-Civita published a number of papers presenting new solutions to Einstein’s equations. This work, while partially translated, remains largely inaccessible to English speaking researchers. ...

    • Lattice study of static quark-antiquark interactions in dense quark matter 

      Astrakhantsev, Nikita Yu.; Bornyakov, Vitaly G.; Braguta, Victor V.; Ilgenfritz, Ernst-Michael; Kotov, Andrey Yuryevich; Nikolaev, Alexander A.; Rothkopf, Alexander Karl (Peer reviewed; Journal article, 2019-05)
      In this paper we study the interactions among a static quark-antiquark pair in the presence of dense two-color quark matter with lattice simulation. To this end we compute Polyakov line correlation functions and determine ...

    • Matching the Nonequilibrium Initial Stage of Heavy Ion Collisions to Hydrodynamics with QCD Kinetic Theory 

      Kurkela, Aleksi; Mazeliauskas, Aleksas; Paquet, Jean-Francois; Schlichting, Sören; Teaney, Derek (Peer reviewed; Journal article, 2019-03)
      High-energy 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 mathematical approach to Wick rotations 

      Helleland, Christer (PhD thesis UiS;536, Doctoral thesis, 2020-09)
      In this thesis we define Wick-rotations mathematically using pseudo-Riemannian geometry, and relate Wick-rotations to real geometric invariant theory (GIT). We discover some new results concerning the existence of Wick ...

    • New benchmarks in the modelling of X-ray atomic form factors 

      Thorkildsen, Gunnar (Peer reviewed; Journal article, 2023)
      Analytical representations of X-ray atomic form factor data have been determined. The original data, f0(s;Z), are reproduced to a high degree of accuracy. The mean absolute errors calculated for all s = sin θ/λ and Z values ...

    • New G2-conifolds in M-theory and their field theory interpretation 

      Svanes, Eirik Eik; Acharya, Bobby S.; Foscolo, Lorenzo; Najjar, Marwan (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 ...

    • A new variational discretization technique for initial value problems bypassing governing equations 

      Rothkopf, Alexander Karl; Nordström, Jan (Peer reviewed; Journal article, 2023-03)
      Motivated by the fact that both the classical and quantum description of nature rest on causality and a variational principle, we develop a novel and highly versatile discretization prescription for classical initial value ...

    • Nil-Killing vector fields and Kundt structures 

      Aadne, Matthew Terje (PhD thesis UiS;529, Doctoral thesis, 2020-06)
      This thesis is based on three papers, for which two have been submitted for publication and one is published. A chapter presenting relevant background material is included giving convenient access to preliminary foreknowledge ...

    • No room to hide: implications of cosmic-ray upscattering for GeV-scale dark matter 

      Alvey, James; Bringmann, Torsten; Kolesova, Helena (Peer reviewed; Journal article, 2023)
      The irreducible upscattering of cold dark matter by cosmic rays opens up the intriguing possibility of detecting even light dark matter in conventional direct detection experiments or underground neutrino detectors. The ...

    • Non-equilibrium quantum field dynamics in the early Universe 

      Eriksson, Magdalena (PhD thesis UiS;, Doctoral thesis, 2023)
      Inflation is the leading paradigm of early Universe cosmology. It provides compelling explanations of the observed near-homogeneity of the cosmic microwave background (CMB) radiation, the spatial flatness of the Universe ...

    • Nonequilibrium attractor in high-temperature QCD plasmas 

      Almaalol, Dekrayat; Kurkela, Aleksi; Strickland, Michael (Peer reviewed; Journal article, 2020)
      We establish the existence of a far-from-equilibrium attractor in weakly coupled gauge theory undergoing one-dimensional Bjorken expansion. We demonstrate that the resulting far-from-equilibrium evolution is insensitive ...

    • On-shell recursion relations for nonrelativistic effective field theories 

      Mojahed, Martin Aria; Brauner, Tomas (Peer reviewed; Journal article, 2021-10)
      We derive on-shell recursion relations for nonrelativistic effective field theories (EFTs) with enhanced soft limits. The recursion relations are illustrated through analytic calculation of tree-level scattering amplitudes ...

    • Opacity dependence of elliptic flow in kinetic theory 

      Kurkela, Aleksi; Wiedemann, Urs Achim; Wu, Bin (Peer reviewed; Journal article, 2019-09)
      The observation of large azimuthal anisotropies vn in the particle spectra of proton–proton (pp) and proton–nucleus (pA) collisions challenges fluid dynamic interpretations of vn, as it remains unclear how small collision ...

    • Open-quantum-systems approach to in-medium heavy quarkonium dynamics 

      Rothkopf, Alexander Karl (Peer reviewed; Journal article, 2023)
      Heavy quarkonium continues to play a central role in the study of nuclear matter under extremes of temperature and density in relativistic heavy-ion collisions. In this talk I report on recent developments in the theoretical ...

    • Predicting parton energy loss in small collision systems 

      Huss, Alexander; Kurkela, Aleksi; Mazeliauskas, Aleksas; Paatelainen, Risto; van der Schee, Wilke; Wiedemann, Urs Achim (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 ...

    • Proper static potential in classical lattice gauge theory at finite T 

      Lehmann, Alexander; Rothkopf, Alexander Karl (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 ...

    • Pulsar timing array stochastic background from light Kaluza-Klein resonances 

      Megías, Eugenio; Nardini, Germano; Quirós, Mariano (Peer reviewed; Journal article, 2023-11)
      We investigate the potential of the warped extradimension framework as an explanation for the recently observed stochastic gravitational background at nHz frequencies in pulsar timing arrays (PTA). Our analysis reveals ...

    • Quantum dynamical dissociation of quarkonia by wave function decoherence in quark-gluon plasma 

      Kajimoto, Shiori; Akamatsu, Yukinao; Asakawa, Masayuki; Rothkopf, Alexander Karl (Peer reviewed; Journal article, 2019-02)
      In this study, we investigate the real-time evolution of quarkonium bound states in a quark-gluon plasma in an improved QCD based stochastic potential model. This model describes the quarkonium dynamics in terms of a ...

    • Quantum gravity phenomenology at the dawn of the multi-messenger era—A review 

      Addazi, A.; Alvarez-Muniz, J.; Alves Batista, Batista; Amelino-Camelia, G.; Antonelli, V.; Arzano, M.; Asorey, M.; Atteia, J.-L.; Bahamonde, S.; Bajardi, F.; Ballesteros, A.; Baret, B.; Barreiros, D.M.; Basilakos, S.; Benisty, D.; Birnholtz, O.; Blanco-Pillado, J.J.; Blas, D.; Bolmont, J.; Boncioli, D.; Bosso, P.; Calcagni, G.; Capozziello, S.; Carmona, J.M.; Cerci, S.; Chernyakova, M.; Clesse, S.; Coelho, J.A.B.; Colak, S.M.; Cortes, J.L.; Das, S.; D'Esposito, V.; Demirci, M.; Di Luca, Luca; di Matteo, Matteo; Dimitrijevic, D.; Djordjevic, G.; Prester, D. Dominis; Eichhorn, A.; Ellis, J.; Escamilla-Rivera, C.; Fabiano, G.; Franchino-Viñas, S.A.; Frassino, A.M.; Frattulillo, D.; Funk, S.; Fuster, A.; Gamboa, J.; Gent, A.; Gergely, L.A.; Giammarchi, M.; Giesel, K.; Glicenstein, J.-F.; Gracia-Bondía, J.; Gracia-Ruiz, R.; Gubitosi, G.; Guendelman, E.I.; Gutierrez-Sagredo, I.; Haegel, L.; Heefer, S.; Held, A.; Herranz, F.J.; Hinderer, T.; Illana, J.I.; Ioannisian, A.; Jetzer, P.; Joaquim, F.R.; Kampert, K.-H.; Uysal, A. Karasu; Katori, T.; Kazarian, N.; Kerszberg, D.; Kowalski-Glikman, J.; Kuroyanagi, S.; Lämmerzahl, C.; Said, J. Levi; Liberati, S.; Lim, E.; Lobo, I.P.; López-Moya, M.; Luciano, G.G.; Manganaro, M.; Marcianò, A.; Martín-Moruno, P.; Martinez, Manel; Martinez, Mario; Martínez-Huerta, H.; Martínez-Miravé, P.; Masip, M.; Mattingly, D.; Mavromatos, N.; Mazumdar, A.; Méndez, F.; Mercati, F.; Micanovic, S.; Mielczarek, J.; Miller, A.L.; Milosevic, M.; Minic, D.; Miramonti, L.; Mitsou, V.A.; Moniz, P.; Mukherjee, S.; Nardini, Germano; Navas, S.; Niechciol, M.; Nielsen, A.B.; Obers, N.A.; Oikonomou, Foteini; Oriti, D.; Paganini, C.F.; Palomares-Ruiz, S.; Pasechnik, R.; Pasic, V.; Pérez de los Heros, de; Pfeifer, C.; Pieroni, M.; Piran, T.; Platania, A.; Rastgoo, S.; Relancio, J.J.; Reyes, M.A.; Ricciardone, Angelo; Risse, M.; Frias, M.D. Rodriguez; Rosati, G.; Rubiera-Garcia, D.; Sahlmann, H.; Sakellariadou, M.; Salamida, F.; Saridakis, E.N.; Satunin, P.; Schiffer, M.; Schüssler, F.; Sigl, G.; Sitarek, J.; Peracaula, J. Solà; Sopuerta, C.F.; Sotiriou, T.P.; Spurio, M.; Staicova, D.; Stergioulas, N.; Stoica, S.; Strišković, J.; Stuttard, T.; Cerci, D. Sunar; Tavakoli, Y.; Ternes, C.A.; Terzić, T.; Thiemann, T.; Tinyakov, P.; Torri, M.D.C.; Tórtola, M.; Trimarelli, C.; Trześniewski, T.; Tureanu, A.; Urban, Federico; Vagenas, E.C.; Vernieri, D.; Vitagliano, V.; Wallet, J.-C.; Zornoza, J.D. (Peer reviewed; Journal article, 2022)
      The exploration of the universe has recently entered a new era thanks to the multi-messenger paradigm, characterized by a continuous increase in the quantity and quality of experimental data that is obtained by the detection ...