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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

Miniworkshop Physics of Matter

Barcelona Aula Magna Enric Cassasas 19/07/2022

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On 19th of July 2022, Dr. Pietro Tierno (UBICS member) has organized a Miniworkshop of Physics of Matter at Aula Magna Enric Cassasas, Physics Faculty, UB.

PROGRAM: 

9:00 - 9:15                     Welcome words: A. Diaz
9:15 – 9:40                    M. Carmen Miguel
9:45 – 10:10                  Eduard Vives
10:15 – 10:40                Sergi Granados Leyva
10:45 – 11:10                Jordi Ortín
Coffee break + discussions (20 min)  
11:30 – 11:55                  Levis Demian
12:00 – 12:25                  Pietro Tierno
12:30 – 12:55                  Alexis de la Cotte 
13:00 – 13:25                  Ramon Planet
13:25 - 13:30                   Closing remarks
Lunch  

Chair: Pietro Tierno

You can see the abstracts of the talks here.

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UBICS Day 2022

Barcelona Edifici Històric 08/09/2022

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On 8th September 2022, UBICS will celebrat its annual UBICS Day 2021, with talks by international researchers and networking activities.

Place: Aula Magna, Edifici Històric (Carrer d'Aribau, 2, 08011 Barcelona)

PROGRAM:

09.30h-10.00h Opening and Welcome
Dr. Albert Diaz-Guilera (UBICS director) and Dr. Joan Guardia (rector UB and UBICS member) 

10.00h-11.00h Talk

Dr. Jürgen Kurths (Potsdam Institute for Climate Impact Research) 

"Climate Meets Complex Systems: Exploring Predictability of Extreme Climate Events via a

Complex Network Approach"

11.00h-11.30h Coffee Break

11.30h-12.30h Talk 

Dra. Ulrike Feudel (ICBM, University of Oldenburg)

12:30-13:30h Talk

Dr. Dan Dediu (UBICS member, Facultat de Filologia i Comunicació)

13.30h-15.30h Lunch

15.30h-16.30h Three thesis minutes competition

PhDs UBICS members

16.30h-17.30h  Talk

Dra. Chantal Valeriani (UCM)

"The role played by interactions in the assembly of active colloids: discovering dynamic laws from observations."

20.00h Dinner

Fábrica Moritz Barcelona (Ronda de Sant Antoni, 41, 08011 Barcelona)

You can do the registration here. 

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recent news

Descrits per primera vegada els senyals mecànics implicats en el desenvolupament primerenc del còrtex del ratolí

IBEC papers 03/06/2022

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Un estudi publicat a la revista Frontiers in Cell and Developmental Biology ha constatat els senyals mecànics i les forces de tracció involucrades en la migració de les cèl·lules de Cajal-Retzius, un grup de neurones amb un important paper en el desenvolupament de l’escorça cerebral. El treball, realitzat en ratolins, l’ha dut a terme un equip liderat pel catedràtic José Antonio del Río, de la Facultat de Biologia i l’Institut de Neurociències (UBNeuro) de la UB, l’Institut de Bioenginyeria de Catalunya (IBEC) —amb seu al Parc Científic de Barcelona— i el Centre d’Investigació Biomèdica en Xarxa sobre Malalties Neurodegeneratives (CIBERNED).  També hi participen equips de la Facultat de Física, la Facultat de Medicina i Ciències de la Salut, l’Institut de Sistemes Complexos (UBICS) de la UB i l’IDIBAPS, entre altres. 

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Què ens podria dir l’oxitocina sobre l’evolució de la conducta prosocial?

UB papers 02/06/2022

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Els humans moderns es caracteritzen per la prosocialitat, un terme ampli que inclou l’empatia intraespecífica, la tolerància social, la cooperació i l’altruisme. Aquestes facetes de la cognició social s’han associat a variacions en els gens de l’oxitocina i la vasotocina (OT i VT) i els seus receptors (OTR-VTR). Per esbrinar les bases genètiques d’aquest comportament, científics de la Universitat de Barcelona (UB) i de la Universitat Rockefeller han desenvolupat un nou estudi en què han comparat les seqüències genòmiques disponibles d’aquests gens entre els humans moderns, les espècies de primats no humans (com el ximpanzé, el bonobo i el macaco) i, per primera vegada, els humans arcaics; per aconseguir-ho, s’han fet servir tots els genomes disponibles de neandertals i denisovans.

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Annual Report 2021 available

UBICS products 16/05/2022

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Annual Report 2021 available: - PDF format - ISSUU viewer

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latest publications

Optimal cost tuning of frustration: Achieving desired states in the Kuramoto-Sakaguchi model

Rosell-Tarrago, Gemma; Diaz-Guilera, Albert
Physical review. E 103 012216 (2021)
abstract

There are numerous examples of studied real-world systems that can be described as dynamical systems characterized by individual phases and coupled in a networklike structure. Within the framework of oscillatory models, much attention has been devoted to the Kuramoto model, which considers a collection of oscillators interacting through a sinus function of the phase differences. In this paper, we draw on an extension of the Kuramoto model, called the Kuramoto-Sakaguchi model, which adds a phase lag parameter to each node. We construct a general formalism that allows us to compute the set of lag parameters that may lead to any phase configuration within a linear approximation. In particular, we devote special attention to the cases of full synchronization and symmetric configurations. We show that the set of natural frequencies, phase lag parameters, and phases at the steady state is coupled by an equation and a continuous spectra of solutions is feasible. In order to quantify the system's strain to achieve that particular configuration, we define a cost function and compute the optimal set of parameters that minimizes it. Despite considering a linear approximation of the model, we show that the obtained tuned parameters for the case of full synchronization enhance frequency synchronization in the nonlinear model as well.

doi

Resting-state default mode network connectivity in young individuals with Down syndrome

Figueroa-Jimenez M.D., Cañete-Massé C., Carbó-Carreté M., Zarabozo-Hurtado D., Peró-Cebollero M., Salazar-Estrada J.G., Guàrdia-Olmos J.
Brain and Behavior 11 1 (2021)
abstract

Down syndrome (DS) is a chromosomal disorder that causes intellectual disability. Few studies have been conducted on functional connectivity using resting-state fMRI (functional magnetic resonance imaging) signals or more specifically, on the relevant structure and density of the default mode network (DMN). Although data on this issue have been reported in adult DS individuals (age: >45 years), the DMN properties in young DS individuals have not been studied. The aim of this study was to describe the density and structure of the DMN network from fMRI signals in young DS (age: <36 years).

doi

Network geometry

Marián Boguñá, Ivan Bonamassa, Manlio De Domenico, Shlomo Havlin, Dmitri Krioukov & M. Ángeles Serrano
Nature Reviews Physics 3 114 135 (2021)
abstract

Networks are finite metric spaces, with distances defined by the shortest paths between nodes. However, this is not the only form of network geometry: two others are the geometry of latent spaces underlying many networks and the effective geometry induced by dynamical processes in networks. These three approaches to network geometry are intimately related, and all three of them have been found to be exceptionally efficient in discovering fractality, scale invariance, self-similarity and other forms of fundamental symmetries in networks. Network geometry is also of great use in a variety of practical applications, from understanding how the brain works to routing in the Internet. We review the most important theoretical and practical developments dealing with these approaches to network geometry and offer perspectives on future research directions and challenges in this frontier in the study of complexity.

doi
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