Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

Few is different : deciphering many-body dynamics in mesoscopic quantum gases

Berges, Juergen ; Brandstetter, Sandra ; Brewer, Jasmine ; Bruun, Georg ; Enss, Tilman ; Floerchinger, Stefan ; Fujii, Keisuke ; Gałka, Maciej ; Giacalone, Giuliano and Guan, Qingze , et al. (2026) In European Physical Journal A 62(6).
Abstract

Emergent macroscopic descriptions of matter, such as hydrodynamics, are central to our description of complex physical systems across a wide spectrum of energy scales. The conventional understanding of these many-body phenomena has recently been shaken by a number of experimental findings. Collective behavior of matter has been observed in mesoscopic systems, such as high-energy hadron–hadron collisions, or ultracold gases with only a few strongly interacting fermions. In such systems, the separation of scales between macroscopic and microscopic dynamics (at the heart of any effective theory) is inapplicable. To address the conceptual challenges that arise from these observations and explore the universality of emergent descriptions of... (More)

Emergent macroscopic descriptions of matter, such as hydrodynamics, are central to our description of complex physical systems across a wide spectrum of energy scales. The conventional understanding of these many-body phenomena has recently been shaken by a number of experimental findings. Collective behavior of matter has been observed in mesoscopic systems, such as high-energy hadron–hadron collisions, or ultracold gases with only a few strongly interacting fermions. In such systems, the separation of scales between macroscopic and microscopic dynamics (at the heart of any effective theory) is inapplicable. To address the conceptual challenges that arise from these observations and explore the universality of emergent descriptions of matter, the EMMI Rapid Reaction Task Force was assembled. This document summarizes the RRTF discussions on recent theoretical and experimental advances in this rapidly developing field. Leveraging technological breakthroughs in the control of quantum systems, we can now quantitatively explore what it means for a system to exhibit behavior beyond the sum of its individual parts. In particular, the report highlights how the (in)applicability of hydrodynamics and other effective theories can be probed across three principal frontiers: the size frontier, the equilibrium frontier, and the interaction frontier.

(Less)
Please use this url to cite or link to this publication:
author
; ; ; ; ; ; ; ; and , et al. (More)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; and (Less)
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
European Physical Journal A
volume
62
issue
6
article number
115
publisher
Springer
external identifiers
  • scopus:105041611262
ISSN
1434-6001
DOI
10.1140/epja/s10050-026-01843-2
language
English
LU publication?
yes
id
96c9992a-7952-4e2a-918d-62ab85ef6b50
date added to LUP
2026-08-13 07:34:30
date last changed
2026-08-13 07:34:50
@article{96c9992a-7952-4e2a-918d-62ab85ef6b50,
  abstract     = {{<p>Emergent macroscopic descriptions of matter, such as hydrodynamics, are central to our description of complex physical systems across a wide spectrum of energy scales. The conventional understanding of these many-body phenomena has recently been shaken by a number of experimental findings. Collective behavior of matter has been observed in mesoscopic systems, such as high-energy hadron–hadron collisions, or ultracold gases with only a few strongly interacting fermions. In such systems, the separation of scales between macroscopic and microscopic dynamics (at the heart of any effective theory) is inapplicable. To address the conceptual challenges that arise from these observations and explore the universality of emergent descriptions of matter, the EMMI Rapid Reaction Task Force was assembled. This document summarizes the RRTF discussions on recent theoretical and experimental advances in this rapidly developing field. Leveraging technological breakthroughs in the control of quantum systems, we can now quantitatively explore what it means for a system to exhibit behavior beyond the sum of its individual parts. In particular, the report highlights how the (in)applicability of hydrodynamics and other effective theories can be probed across three principal frontiers: the size frontier, the equilibrium frontier, and the interaction frontier.</p>}},
  author       = {{Berges, Juergen and Brandstetter, Sandra and Brewer, Jasmine and Bruun, Georg and Enss, Tilman and Floerchinger, Stefan and Fujii, Keisuke and Gałka, Maciej and Giacalone, Giuliano and Guan, Qingze and Heintze, Carl and Heyen, Lars H. and Selyuzhenkov, Ilya and Jochim, Selim and Levinsen, Jesper and Lunt, Philipp and Masciocchi, Silvia and Mazeliauskas, Aleksas and Navon, Nir and Ohlson, Alice and Parish, Meera and Reimann, Stephanie M. and Scazza, Francesco and Schäfer, Thomas and Teaney, Derek and Thywissen, Joseph and Venugopalan, Raju and Yan, Yangqian and Zaccanti, Matteo and Zache, Torsten V.}},
  issn         = {{1434-6001}},
  language     = {{eng}},
  number       = {{6}},
  publisher    = {{Springer}},
  series       = {{European Physical Journal A}},
  title        = {{Few is different : deciphering many-body dynamics in mesoscopic quantum gases}},
  url          = {{http://dx.doi.org/10.1140/epja/s10050-026-01843-2}},
  doi          = {{10.1140/epja/s10050-026-01843-2}},
  volume       = {{62}},
  year         = {{2026}},
}