Is this you? As a journalist, you can create a free Muck Rack account to customize your profile, list your contact preferences, and upload a portfolio of your best work.
Claim your profile
Articles by Urs Achim
Physics Briefing Book: Input for the 2026 update of the European Strategy for Particle Physics
de Blas, J. et al. (2025) Physics Briefing Book: Input for the 2026 update of the European Strategy for Particle Physics. Series: CERN yellow reports: monographs. CERN. ISBN 9789290837107 Text 377692.pdf - Published Version Available under License Creative Commons Attribution. 48MB Abstract The CERN Council established the European Strategy Group (ESG), which is responsible for submitting final recommendations to the Council for approval in early 2026.
Dynamics of Heavy Quarks in Strongly Coupled $\mathcal{N}=4$ SYM Plasma
Home > Dynamics of Heavy Quarks in Strongly Coupled $\mathcal{N}=4$ SYM Plasma Report number CERN-TH-2025-008 ; MIT-CTP/5822 ; arXiv:2501.06289 Title Dynamics of Heavy Quarks in Strongly Coupled $\mathcal{N}=4$ SYM Plasma If you experience any problem watching the video, click the download button below Author(s) Rajagopal, Krishna (MIT, Cambridge, CTP) ; Scheihing-Hitschfeld, Bruno (MIT, Cambridge, CTP ; Santa Barbara, KITP) ; Wiedemann, Urs Achim (CERN) Document contact Contact: arXiv...
CERN Document Server
Report number CERN-TH-2024-110 ; arXiv:2407.07484 Title A Decade of Collectivity in Small Systems If you experience any problem watching the video, click the download button below Author(s) Grosse-Oetringhaus, Jan Fiete (CERN) ; Wiedemann, Urs Achim (CERN) Document contact Contact: arXiv Imprint 2024-07-10. - 81 p.
The medium-modified $$ g\to c\overline{c} $$ splitting function in the BDMPS-Z formalism
Journal of High Energy Physics, Jan 2023 This is a preview of a remote PDF: https://link.springer.com/content/pdf/10.1007/JHEP01(2023)080.pdf Attems, Maximilian, Brewer, Jasmine, Innocenti, Gian Michele, Mazeliauskas, Aleksas, Park, Sohyun, van der Schee, Wilke, Wiedemann, Urs Achim. , Journal of High Energy Physics, 2023, pp. 1-60, Volume 2023, Issue 1, DOI: 10.1007/JHEP01(2023)080
CERN Document Server
Report number arXiv:2106.10184 ; CERN-TH-2021-095 Title Backreaction from inhomogeneous matter fields during large-scale structure formation Author(s) Floerchinger, Stefan (U. Heidelberg, ITP) ; Tetradis, Nikolaos (Athens U.) ; Wiedemann, Urs Achim (CERN) Imprint 2021-06-18. - 11 p.
HIP and HEP
Report number arXiv:2101.01971 ; CERN-TH-2021-006 Title HIP and HEP Author(s) Wiedemann, Urs Achim Imprint 2021-01-06. - 10 p. Note 10 pages, 7 figures Subject category hep-ph ; Particle Physics - Phenomenology Abstract This write-up of the ICHEP plenary "Heavy Ions - theory" focusses on some recent LHC discoveries and future opportunities in heavy ion physics (HIP) that are at the intersection with high energy physics (HEP).
CERN Document Server
Report number arXiv:2007.13754 ; CERN-TH-2020-126 Title Discovering partonic rescattering in light nucleus collisions If you experience any problem watching the video, click the download button below Download Embed Viewed by - users Author(s) Huss, Alexander ; Kurkela, Aleksi ; Mazeliauskas, Aleksas ; Paatelainen, Risto ; van der Schee, Wilke ; Wiedemann, Urs Achim Imprint 2020-07-27. - 8 p.
Hydrodynamization in systems with detailed transverse profiles
Report number CERN-TH-2020-118 ; arXiv:2007.06851 Title Hydrodynamization in systems with detailed transverse profiles If you experience any problem watching the video, click the download button below Download Embed Viewed by - users Author(s) Kurkela, Aleksi ; Taghavi, Seyed Farid ; Wiedemann, Urs Achim ; Wu, Bin Imprint 2020-07-14 Subject category nucl-th ; Nuclear Physics - Theory ; hep-ph ; Particle Physics - Phenomenology Abstract The observation of fluid-like behavior in...
CERN Document Server
Report number arXiv:1907.10729 ; CERN-TH-2019-122 ; TUM-HEP-1215/19 Title The dark matter bispectrum from effective viscosity and one-particle irreducible vertices Download Embed Viewed by 12 users Author(s) Floerchinger, Stefan ; Garny, Mathias ; Katsis, Aris ; Tetradis, Nikolaos ; Wiedemann, Urs Achim Imprint 2019-07-24. - 24 p.
What attracts to attractors?
Report number CERN-TH-2019-120 ; arXiv:1907.08101 Title What attracts to attractors?
Flow in AA and pA as an interplay of fluid-like and non-fluid like excitations
Report number arXiv:1905.05139 ; CERN-TH-2019-066 Title Flow in AA and pA as an interplay of fluid-like and non-fluid like excitations Download Embed Viewed by 15 users Author(s) Kurkela, Aleksi ; Wiedemann, Urs Achim ; Wu, Bin Imprint 2019-05-13. - 28 p.
Thermal width of the Higgs boson in hot QCD matter
Report number CERN-TH-2019-003 ; arXiv:1901.04503 Title Thermal width of the Higgs boson in hot QCD matter Download Embed Viewed by 13 users Author(s) Ghiglieri, Jacopo ; Wiedemann, Urs Achim Imprint 2019-01-14. - 5 p.
CERN Document Server
Preprint Report number arXiv:1812.04113 ; CERN-TH-2018-270 Title Collectivity in pp from resummed interference effects? Author(s) Blok, Boris ; Wiedemann, Urs Achim Imprint 2018-12-10. - 8 p.
CERN Document Server
The azimuthal anisotropies $v_n$ of particle spectra measured in proton-nucleus (pA) and nucleus-nucleus (AA) collisions play a key role in constraining QCD matter properties like the shear viscosity over entropy density ratio $\eta/s$. Here, we compare calculations of $v_n$'s from viscous fluid dynamics and from kinetic transport which start both from the same initial conditions and which implement the same matter properties.
CERN Document Server
We discuss two aspects of the scenario in which dark matter possesses (fundamental or effective) viscosity: a) Large shear viscosity can induce the acceleration of the average expansion through the backreaction of fluctuations. b) Treating dark matter at large scales as an effectively viscous fluid provides an improved framework for the calculation of the matter power spectrum.
Nearly isentropic flow at sizeable $\eta/s$
Non-linearities in the harmonic spectra of hadron-nucleus and nucleus-nucleus collisions provide evidence for the dynamical response to azimuthal spatial eccentricities. Here, we demonstrate within the framework of transport theory that even the mildest interaction correction to a picture of free-streaming particle distributions, namely the inclusion of one perturbatively weak interaction ("one-hit dynamics"), will generically give rise to all observed linear and non-linear structures.
Analytic structure of nonhydrodynamic modes in kinetic theory : arXiv
How physical systems approach hydrodynamic behavior is governed by the decay of nonhydrodynamic modes. Here, we start from a relativistic kinetic theory that encodes relaxation mechanisms governed by different timescales thus sharing essential features of generic weakly coupled nonequilib- rium systems.
Collectivity from interference : arXiv
In hadronic collisions, interference between different production channels affects momentum distributions of multi-particle final states. As this QCD interference does not depend on the strong coupling constant, it is part of the no-interaction baseline that needs to be controlled prior to searching for other manifestations of collective dynamics.
Sensitivity of jet substructure to jet-induced medium response : arXiv
Jet quenching in heavy ion collisions is expected to be accompanied by recoil effects, but unambiguous signals for the induced medium response have been difficult to identify so far. Here, we argue that modern jet substructure measurements can improve this situation qualitatively since they are sensitive to the momentum distribution inside the jet.
Show More
loading
Actions
Is this you?
As a journalist, you can create a free Muck Rack account to customize your profile, list your contact preferences, and upload a portfolio of your best work.Get in touch with Urs
Contact Urs, search articles and posts on X, monitor coverage, and track replies from one place.
Learn more about Muck Rack