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Universitat de Barcelona Institute of Complex Systems

Complex systems are characterized by their emergent behavior as a non-trivial result of the evolution of a considerable number of microscopic units that interact with each other. Expressed in other words: the study of complex systems seeks to understand the behavior and properties of the whole system that can not be derived directly from the study of the properties of its parts in isolation.

This is the essence of the research of complex systems, where the nature of the units is irrelevant. Associated strategies to address the study of a specific phenomenon, then, may be widely shared by a large number of phenomena characteristic of various disciplines. Even we can say that the complexity of the science itself is the result of the fusion of different disciplines and approaches on the same challenge. Therefore, the study of complex systems integrates problems and merges methodologies that can have very different origins.

The creation of the UBICS will join efforts of several groups of related research that will:

  • Access to funding sources not accessible to the research groups separately
  • A greater capacity for dialogue between disciplines
  • Promoting synergies between researchers from different fields
  • Improve the quality of research Increasing scientific production in the border areas of research areas that make up the UBICS 
  • Substantially increase the innovative capacity and transfer knowledge to society
  • Consolidate and promote joint activities already developed new Increasing the visibility of social research on complex systems

The research at the Institute is structured along four major pillars. Together, they combine the exploration of new concepts in the field of Complex Systems and their application in different scientific and social disciplines.

RESEARCH LINES:

Foundations Science of Matter Life Sciences Social Sciences
Statistical Physics  Soft Matter Molecular Biophysics Psychology and Behavior
Networks  Complex Flows and Complex Fluids  Cell and Multicellular Biology  Economy and Finance 
Dynamical systems  Active Matter  Systems Biology  Linguistics
Data Science  Smart Materials Neuroscience  History 

upcoming events

Avalanches 2024, Finland (Helsinki)

Helsinki (Finland) 19/06/2023

Overview

The meeting is proposed to be organized in June, 2024 in Helsinki, the capital of Finland. The period is not without some interest due to the Northern sun and long days and it should be acceptable as it is in a teaching-light month for most countries. We have in a preliminary manner chosen the conference center of Hanasaari (hanaholmen.fi) in a very beautiful location, and close to a) Helsinki city center, b) a metro station, and c) Aalto University. The site offers conference facilities, a hotel, and an excellent restaurant and is within easy access from the Helsinki airport. The invited speakers would be accommodated at Hanasaari, and the location makes it so that various options are available to other participants.

Our intention is to find a program that reflects the local organizers’ interest, novel developments, and suggestions from the Advisory Committee. We are going to be looking for local sources of funding, but we expect to be able to offer accommodation as usual for the invited speakers, plus local meals, and to offer a very reasonable participant package covering lunches and the conference dinner. If funds are raised to a sufficient degree, a few student grants covering local costs is not excluded.

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recent news

Oferta de feina

albert grants 28/02/2023

news picture no: 52

OFERTA FEINA Tècnic de suport al @UB_ICS

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Minicurs Física de la complexitat en la matèria activa

UBICS projects 22/02/2023

news picture no: 21

Minicurs de Física de la complexitat en la matèria activ​​​​​​​a per alumnes de Grau i Master (preferentment). La materia activa es una classe de sistemes de matèria condensada composats per unitats, o partícules, que s'autopropulsen i que operen fora de l'equilibri termodinàmic. Els sistemes vius en son un exemple representatiu. Aquestes partícules actives posseeixen graus de llibertat interns que les capaciten per poder moure's extraient energia de l'ambient i dissipant-la al moure's en qualsevol direcció. La materia activa ens obre noves vies d'estudi per esbrinar quins mecanismes físics son responsables dels comportaments emergents dels sistemes vius. PROGRAMA DEL CURS: Dia: 22 de febrer (13:15-14:30h) Professor: Ignacio Pagonabarraga. Una introducció a la física de sistemes de partícules actives. Dia: 28 de febrer (13:15-14:30h) Professor: Alberto Fernandez-Nieves. Soft, partially ordered, granular and active – Experimental findings in active liquid crystals and fire-ant collectives Dia: 8 de març (13:15-14:30h) Professora: M.Carmen Miguel Presa de decisions i moviment col·lectiu en la dinàmica d'animals socials i eixams de robots. Dia: 15 de març (13:15-14:30h) Professor: Matteo Paoluzzi Critical dynamics with persistent noise Inscripció i més informació del curs: http://ubics.ub.edu/materiactiva.html

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Dia de la Dona i la Nena a la Ciència - Café amb científiques

UB projects 17/02/2023

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Aquest divendres, 17 de Febrer, es celebra el Dia Internacional de la Dona i la Nena a la Ciència a la UB. Un any més l'UBICS ha col·laborat en l'organització de l'acte "Cafè amb científiques" on membres de l'UBICS hi participen. Data: 17 Febrer 2023 Hora: 14:00-15:00h Lloc: Eduard Fontseré i retransmisió en directe: https://ub-edu.zoom.us/j/95396799068?pwd=a3RHUGhqNGo2aUlNVjhWYTJvQmJoUT09#success Descripció: Has pensat mai a fer carrera científica? No estàs gaire segura de com és? En aquesta activitat convidem a tothom, especialment dones del món de la ciència, a compartir un espai amb científiques per posar en comú diferents aspectes de la carrera científica sent dona. Farem un col·loqui amb les participants i també gaudirem d’un cafè per fomentar un espai de trobada entre dones científiques. Participen les investigadores de la UB: 1) Irene Ferri: investigadora predoctoral, UBICS 2) Ana Climent: estudiant de doctorat, ICCUB 3) Elena Xuriguera: professora agregada, Facultat de Química, grup DIOPMA. 4) Núria López: IdRA, Margarita Salas Postdoc. 5) Júlia Molins i Vigatà: estudiant de doctorat, Institut de Geomodels. 6) Alba Espargaró Colomé: professora lectora, IN2UB 7) Creu Palacín Cabañas: professora titutar, grup IRBIO Acte organitzat per: Institut de Ciències del Cosmos (ICCUB); Institut de Recerca en Sistemes Complexos (UBICS); Institut de Nanociència i Nanotecnologia (IN2UB); Institut de Recerca de l'Aigua (IdRA); Institut de Recerca GEOMODELS; Institut de Química Teòrica i Computacional (IQTCUB): Facultat de Biologia; Facultat de Ciències de la Terra; Facultat de Farmàcia; Facultat de Física; Facultat de Ciències de la Terra ; Facultat de Química. Coffee break inclós! Tens tota la informació a: http://ubics.ub.edu/news.php T'animem a participar i a que en facis difusió! Moltes gràcies! https://www.ub.edu/activitats/dia-dona-nena-ciencia

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latest publications

Collective motion of run-And-Tumble repulsive and attractive particles in one-dimensional systems

Gutiérrez, C. Miguel Barriuso ;Vanhille-Campos, Christian ;Alarcón, Francisco ;Pagonabarraga, Ignacio ;Brito, Ricardo ;Valeriani, Chantal
SOFT MATTER 1744683X (2022)
abstract

Active matter deals with systems whose particles consume energy at the individual level in order to move. To unravel features such as the emergence of collective structures, several models have been suggested, such as the on-lattice model of run-And-Tumble particles implemented via the persistent exclusion process (PEP). In our work, we study a one-dimensional system of run-And-Tumble repulsive or attractive particles, both on-lattice and off-lattice. Additionally, we implement cluster motility dynamics in the on-lattice case (since in the off-lattice case, cluster motility arises from the individual particle dynamics). While we observe important differences between discrete and continuous dynamics, few common features are of particular importance. Increasing particle density drives aggregation across all different systems explored. For non-Attractive particles, the effects of particle activity on aggregation are largely independent of the details of the dynamics. In contrast, once attractive interactions are introduced, the steady-state, which is completely determined by the interplay between these and the particles' activity, becomes highly dependent on the details of the dynamics. 

doi

Scale-free behavioral cascades and effective leadership in schooling fish

Múgica, Julia;Torrents, Jordi ; Cristín, Javier ;Puy, Andreu; Miguel, M. Carmen,; Pastor-Satorras, Romualdo
Scientific Reports 20452322 (2022)
abstract

Behavioral contagion and the presence of behavioral cascades are natural features in groups of animals showing collective motion, such as schooling fish or grazing herbivores. Here we study empirical behavioral cascades observed in fish schools defined as avalanches of consecutive large changes in the heading direction of the trajectory of fish. In terms of a minimum turning angle introduced to define a large change, avalanches are characterized by distributions of size and duration showing scale-free signatures, reminiscent of self-organized critical behavior. We observe that avalanches are generally triggered by a small number of fish, which act as effective leaders that induce large rearrangements of the group’s trajectory. This observation motivates the proposal of a simple model, based in the classical Vicsek model of collective motion, in which a given individual acts as a leader subject to random heading reorientations. The model reproduces qualitatively the empirical avalanche behavior observed in real schools, and hints towards a connection between effective leadership, long range interactions and avalanche behavior in collective movement. 

doi

Temporal mapping of derived high-frequency gene variants supports the mosaic nature of the evolution of Homo sapiens

Andirkó, Alejandro, Moriano, Juan ; Vitriolo, Alessandro, ;Kuhlwilm, Martinf, ;Testa, Giuseppe, ; Boeckx, Cedric
Scientific Reports 20452322 (2022)
abstract

Large-scale estimations of the time of emergence of variants are essential to examine hypotheses concerning human evolution with precision. Using an open repository of genetic variant age estimations, we offer here a temporal evaluation of various evolutionarily relevant datasets, such as Homo sapiens-specific variants, high-frequency variants found in genetic windows under positive selection, introgressed variants from extinct human species, as well as putative regulatory variants specific to various brain regions. We find a recurrent bimodal distribution of high-frequency variants, but also evidence for specific enrichments of gene categories in distinct time windows, pointing to different periods of phenotypic changes, resulting in a mosaic. With a temporal classification of genetic mutations in hand, we then applied a machine learning tool to predict what genes have changed more in certain time windows, and which tissues these genes may have impacted more. Overall, we provide a fine-grained temporal mapping of derived variants in Homo sapiens that helps to illuminate the intricate evolutionary history of our species. 

doi
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