Universality of energy-momentum response in kinetic theories
We study the response of the energy-momentum tensor in several kinetic theories, from the simple relaxation time approximation (RTA) to Quantum Chromodynamics (QCD). Irrespective of the differences in microscopic properties, we find a remarkable degree of universality in the response functions from...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-10-01
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| Series: | Physics Letters B |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269323004951 |
| _version_ | 1797676624995418112 |
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| author | Xiaojian Du Stephan Ochsenfeld Sören Schlichting |
| author_facet | Xiaojian Du Stephan Ochsenfeld Sören Schlichting |
| author_sort | Xiaojian Du |
| collection | DOAJ |
| description | We study the response of the energy-momentum tensor in several kinetic theories, from the simple relaxation time approximation (RTA) to Quantum Chromodynamics (QCD). Irrespective of the differences in microscopic properties, we find a remarkable degree of universality in the response functions from conformal theories. We find that the response to scalar perturbations in kinetic theory can be effectively described by a pair of one hydrodynamic sound mode and one non-hydrodynamic mode. We find that even beyond the range of validity of hydrodynamics, the energy-momentum response in position space can be effectively described by one single mode with non-trivial dispersion relation and residue. |
| first_indexed | 2024-03-11T22:31:56Z |
| format | Article |
| id | doaj.art-7c03cba109e74358bef7752f735bed5a |
| institution | Directory Open Access Journal |
| issn | 0370-2693 |
| language | English |
| last_indexed | 2024-03-11T22:31:56Z |
| publishDate | 2023-10-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics Letters B |
| spelling | doaj.art-7c03cba109e74358bef7752f735bed5a2023-09-23T05:10:31ZengElsevierPhysics Letters B0370-26932023-10-01845138161Universality of energy-momentum response in kinetic theoriesXiaojian Du0Stephan Ochsenfeld1Sören Schlichting2Instituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, E-15782 Galicia, Spain; Fakultät für Physik, Universität Bielefeld, D-33615 Bielefeld, Germany; Corresponding author.Fakultät für Physik, Universität Bielefeld, D-33615 Bielefeld, GermanyFakultät für Physik, Universität Bielefeld, D-33615 Bielefeld, GermanyWe study the response of the energy-momentum tensor in several kinetic theories, from the simple relaxation time approximation (RTA) to Quantum Chromodynamics (QCD). Irrespective of the differences in microscopic properties, we find a remarkable degree of universality in the response functions from conformal theories. We find that the response to scalar perturbations in kinetic theory can be effectively described by a pair of one hydrodynamic sound mode and one non-hydrodynamic mode. We find that even beyond the range of validity of hydrodynamics, the energy-momentum response in position space can be effectively described by one single mode with non-trivial dispersion relation and residue.http://www.sciencedirect.com/science/article/pii/S0370269323004951 |
| spellingShingle | Xiaojian Du Stephan Ochsenfeld Sören Schlichting Universality of energy-momentum response in kinetic theories Physics Letters B |
| title | Universality of energy-momentum response in kinetic theories |
| title_full | Universality of energy-momentum response in kinetic theories |
| title_fullStr | Universality of energy-momentum response in kinetic theories |
| title_full_unstemmed | Universality of energy-momentum response in kinetic theories |
| title_short | Universality of energy-momentum response in kinetic theories |
| title_sort | universality of energy momentum response in kinetic theories |
| url | http://www.sciencedirect.com/science/article/pii/S0370269323004951 |
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