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6 results on '"Burkhard Kämpfer"'

1. Towards a Warm Holographic Equation of State by an Einstein–Maxwell-Dilaton Model

Author

Rico Zöllner and Burkhard Kämpfer

Subjects
holographic Einstein–Maxwell-dilaton model, critical end point, equation of state, Mathematics, QA1-939
Abstract

The holographic Einstein–Maxwell-dilaton model is employed to map state-of-the-art lattice QCD thermodynamics data from the temperature (T) axis towards the baryon–chemical potential (μB) axis and aims to gain a warm equation of state (EoS) of deconfined QCD matter which can be supplemented with a cool and confined part suitable for subsequent compact (neutron) star (merger) investigations. The model exhibits a critical end point (CEP) at TCEP=O(100) MeV and μBCEP=500…700 MeV with an emerging first-order phase transition (FOPT) curve which extends to large values of μB without approaching the μB axis. We consider the impact and peculiarities of the related phase structure on the EoS for the employed dilaton potential and dynamical coupling parameterizations. These seem to prevent the design of an overall trustable EoS without recourse to hybrid constructions.

Published
2024
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2. Masses of Compact (Neutron) Stars with Distinguished Cores

Author

Rico Zöllner, Minghui Ding, and Burkhard Kämpfer

Subjects
compact stars, core-corona decomposition, impact of core mass, Dark-Matter admixture, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

In this paper, the impact of core mass on the compact/neutron-star mass-radius relation is studied. Besides the mass, the core is parameterized by its radius and surface pressure, which supports the outside one-component Standard Model (SM) matter. The core may accommodate SM matter with unspecified (or poorly known) equation-of-state or several components, e.g., consisting of admixtures of Dark Matter and/or Mirror World matter etc. beyond the SM. Thus, the admissible range of masses and radii of compact stars can be considerably extended.

Published
2023
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3. Quarkonia Formation in a Holographic Gravity–Dilaton Background Describing QCD Thermodynamics

Author

Rico Zöllner and Burkhard Kämpfer

Subjects
AdS/CFT correspondence, QCD phenomenology, meson spectral functions, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

A holographic model of probe quarkonia is presented, where the dynamical gravity–dilaton background was adjusted to the thermodynamics of 2 + 1 flavor QCD with physical quark masses. The quarkonia action was modified to account for the systematic study of the heavy-quark mass dependence. We focused on the J/ψ and Υ spectral functions and related our model to heavy quarkonia formation as a special aspect of hadron phenomenology in heavy-ion collisions at LHC.

Published
2021
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4. New results on light nuclei, hyperons and hypernuclei from HADES (HADES collaboration)

Author

Rayane Abou Yassine, Jörn Adamczewski-Musch, Marten Becker, Philip Bergmann, Alberto Blanco, Christoph Blume, Lukas Chlad, Petr Chudoba, Izabela Ciepał, Malte Cordts, Jörn Dreyer, Waleed Ahmed Esmail, Miroslaw Firlej, Tomasz Fiutowski, Henrik Floersheimer, Paulo Fonte, Jürgen Friese, Ingo Fröhlich, Jörg Förtsch, Tetyana Galatyuk, Tomasz Gniazdowski, Robert Greifenhagen, Mateusz Grunwald, Dieter Grzonka, Malgorzata Gumberidze, Szymon Harabasz, Thorsten Heinz, Claudia Höhne, Fatima Hojeij, Romain Holzmann, Holger Huck, Marek Idzik, Burkhard Kämpfer, Karl-Heinz Kampert, Behruz Kardan, Vadym Kedych, Ilse Koenig, Wolfgang Koenig, Marvin Kohls, Jedrzej Kolas, Grzegorz Korcyl, Georgy Kornakov, Frederic Kornas, Roland Kotte, Wilhelm Krueger, Andrej Kugler, Pawel Kulessa, Rafal Lalik, Semen Lebedev, Sergey Linev, Luís Lopes, Manuel Lorenz, Akshay Malige, Jochen Markert, Tomasz Matulewicz, Johan Messchendorp, Volker Metag, Jan Michel, Aleksandra Molenda, Jakub Moron, Christian Müntz, Marvin Nabroth, Lothar Naumann, Jan Orliński, Jan-Hendrik Otto, Yannis Parpottas, Mirco Parschau, Christian Pauly, Vladimir Pechenov, Olga Pechenova, Gabriela Perez Andrade, Dennis Pfeifer, Krzysztof Piasecki, Jerzy Pietraszko, Tetiana Povar, Alexandr Prozorov, Witold Przygoda, Krzysztof Pysz, Béatrice Ramstein, Narendra Rathod, James Ritman, Adrian Rost, Anar Rustamov, Piotr Salabura, Joao Saraiva, Susan Schadmand, Niklas Schild, Erwin Schwab, Florian Seck, Ilya Selyuzhenkov, Udai Singh, Leon Skorpil, Jerzy Smyrski, Manfred Sobiella, Stefano Spataro, Simon Spies, Maria Stefaniak, Herbert Ströbele, Joachim Stroth, Konrad Sumara, Ondřej Svoboda, Krzysztof Swientek, Melanie Szala, Pavel Tlusty, Michael Traxler, Haralabos Tsertos, Vladimir Wagner, Mateusz Wasiluk, Adrian Amatus Weber, Christian Wendisch, Peter Wintz, Hanna Zbroszczyk, Elizaveta Zherebtsova, Marcin Zielinski, and Peter Zumbruch

Abstract

In March 2019 the HADES experiment recorded 14 billion Ag+Ag collisions at √sNN = 2.55 GeV as a part of the FAIR phase-0 physics program. In this contribution, we present and investigate our capabilities to reconstruct and analyze weakly decaying strange hadrons and hypernuclei emerging from these collisions. The focus is put on measuring the mean lifetimes of these particles.

Published
2022
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5. Dynamical freeze-out phenomena: The case of $K^\pm, ��$ transverse momentum spectra in collisions of Au(1.23 A GeV) + Au

Author

Burkhard Kämpfer and Benjamin Rabe

Subjects
Physics, 010308 nuclear & particles physics, Nuclear Theory, Strangeness production, FOS: Physical sciences, heavy-ion collisions, Kinetic energy, 01 natural sciences, Spectral line, Nuclear physics, Nuclear Theory (nucl-th), subthreshold strangeness production, 0103 physical sciences, Transverse momentum, freeze-out, Absorption (chemistry), 010306 general physics, Nuclear Experiment
Abstract

We argue for a continuous (dynamical) kinetic freeze-out of K &plusmn, ϕ observed at midrapidity in collisions of Au(1.23 A GeV) + Au. The simulations, by means of a transport model of Boltzmann-&Uuml, hling-Uhlenbeck (BUU) type, point to time independent transverse momentum slope parameters after 20 fm/c. The complex interplay of expansion dynamics and strangeness production/exchange/absorption as well as elastic scatterings involved in the reaction network does not support the previous interpretation of a late freeze-out of K &minus, due to larger cross sections.

Published
2019
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