November 2018 - Materia-seminarios

Recordatorio de Seminario: The statistical mechanics of cortical asynchronous states.
by Daniel Manzano 27 Nov '18

27 Nov '18

Desde el grupo de Física Estadística y de los Sistemas Complejos tenemos les invitamos a asistir a nuestro próximo seminario: Ponente: Pablo Villegas Góngora. Universidad de Granada. Título: The statistical mechanics of cortical asynchronous states Resumen: Cortical networks are shaped by the combined action of excitatory and inhibitory interactions. We elucidate a general noise-induced effect that we call “Jensen’s force” –stemming from the combined effect of excitation/inhibition balance and network sparsity– which is responsible for generating a phase of self-sustained low activity in excitation-inhibition networks. The uncovered phase reproduces all key empirically-observed features of cortical networks in the so-called asynchronous state, characterized by low, un-correlated and highly-irregular activity. Through a parsimonious model we resolve a number of long-standing issues, such as proving that activity can be arbitrarily low, but still self-sustained even in the complete absence of external stimuli or driving. This approach opens new avenues for theoretical and conceptual understanding of the phases and phase transitions of actual neural networks, from a broad statistical-mechanics perspective, with the aim to elucidate how the cortex processes information and computes. Lugar: Seminario de Física Computacional (aula F1). Departamento de Física de la Materia. Facultad de Ciencias. Fecha y hora: Jueves 29 de Noviembre. 12:00. Más información: https://ic1.ugr.es/eventos/wp/seminariosinternos16/ <https://ic1.ugr.es/eventos/wp/seminariosinternos16/> Atentamente, --------------------------------------------------------------------------------- Daniel Manzano Electromagnetism and Condensed Matter Department University of Granada Facultad de Ciencias, Av. Fuentenueva s/n Granada 18071, Spain Phone: +34 958241000 Ext: 20569 <tel:+34%20958241000;20569> http://ic1.ugr.es/manzano/ <http://ic1.ugr.es/manzano/>

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Seminario: The statistical mechanics of cortical asynchronous states
by Daniel Manzano 21 Nov '18

21 Nov '18

Desde el grupo de Física Estadística y de los Sistemas Complejos tenemos les invitamos a asistir a nuestro próximo seminario: Ponente: Pablo Villegas Góngora. Universidad de Granada. Título: The statistical mechanics of cortical asynchronous states Resumen: Cortical networks are shaped by the combined action of excitatory and inhibitory interactions. We elucidate a general noise-induced effect that we call “Jensen’s force” –stemming from the combined effect of excitation/inhibition balance and network sparsity– which is responsible for generating a phase of self-sustained low activity in excitation-inhibition networks. The uncovered phase reproduces all key empirically-observed features of cortical networks in the so-called asynchronous state, characterized by low, un-correlated and highly-irregular activity. Through a parsimonious model we resolve a number of long-standing issues, such as proving that activity can be arbitrarily low, but still self-sustained even in the complete absence of external stimuli or driving. This approach opens new avenues for theoretical and conceptual understanding of the phases and phase transitions of actual neural networks, from a broad statistical-mechanics perspective, with the aim to elucidate how the cortex processes information and computes. Lugar: Seminario de Física Computacional (aula F1). Departamento de Física de la Materia. Facultad de Ciencias. Fecha y hora: Jueves 29 de Noviembre. 12:00. Más información: https://ic1.ugr.es/eventos/wp/seminariosinternos16/ Atentamente, --------------------------------------------------------------------------------- Daniel Manzano Electromagnetism and Condensed Matter Department University of Granada Facultad de Ciencias, Av. Fuentenueva s/n Granada 18071, Spain Phone: +34 958241000 Ext: 20569 http://ic1.ugr.es/manzano/ <http://ic1.ugr.es/manzano/>

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Curso: Inference and learning: a statistical physics perspective
by Daniel Manzano 13 Nov '18

13 Nov '18

Desde el grupo de Física Estadística y de los Sistemas Complejos anunciamos el siguiente curso que se realizará en nuestro departamento: Inference and learning: a statistical physics perspective PROFESOR: Miguel Ibañez-Berganza. Universita di Roma “La Sapienza” FECHAS Y HORARIO : De lunes 19 de Noviembre a Jueves 22 de Noviembre de 15.00-17.00 LUGAR: Seminario Fisica Estadística, planta baja del edificio de Física. Atentamente, --------------------------------------------------------------------------------- Daniel Manzano Electromagnetism and Condensed Matter Department University of Granada Facultad de Ciencias, Av. Fuentenueva s/n Granada 18071, Spain Phone: +34 958241000 Ext: 20569 http://ic1.ugr.es/manzano/ <http://ic1.ugr.es/manzano/>

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Recordatorio de seminario: Anomalies, Rare Events, and Brownian Motion.
by Daniel Manzano 07 Nov '18

07 Nov '18

Desde el grupo de Física Estadística y de los Sistemas Complejos les invitamos a asistir al siguiente seminario: Ponente: Sándalo Roldán-Vargas. Max Planck Institute for the Physics of Complex Systems. Título: Anomalies, Rare Events, and Brownian Motion. Resumen: In one of his celebrated 1905 papers, Albert Einstein proposed for the first time a statistical interpretation of Robert Brown’s innocent observation based on the corpuscular constitution of matter. His theory stated that the long-time motion of a Brownian particle is diffusive whereas the probability distribution of the particle displacement is Gaussian. For more than one hundred years these predictions were systematically validated on real systems and the coexistence between Diffusivity and Gaussianity became a paradigm. However, recent experiments on mesoscopic particle systems have claimed the existence of a time regime where diffusion is not accompanied by a purely Gaussian distribution of displacements. In this talk I will discuss these recent observations as well as those minimal stochastic models proposed to rationalize the new intriguing experimental phenomenology. Using molecular dynamics simulations I will further discuss the emergence of the hypothetical diffusive yet non-Gaussian regime in glass- and gel-forming liquids. I will conclude my talk by exploring the connection between non-Gaussian dynamics and system topology. Lugar: Seminario de Física Computacional (aula F1). Departamento de Física de la Materia. Facultad de Ciencias. Fecha y hora: Jueves 8 de Noviembre. 12:00. Atentamente, --------------------------------------------------------------------------------- Daniel Manzano Electromagnetism and Condensed Matter Department University of Granada Facultad de Ciencias, Av. Fuentenueva s/n Granada 18071, Spain Phone: +34 958241000 Ext: 20569 http://ic1.ugr.es/manzano/ <http://ic1.ugr.es/manzano/>

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Seminario: Anomalies, Rare Events, and Brownian Motion
by Daniel Manzano 05 Nov '18

05 Nov '18

Desde el grupo de Física Estadística y de los Sistemas Complejos les invitamos a asistir al siguiente seminario: Ponente: Sándalo Roldán-Vargas. Max Planck Institute for the Physics of Complex Systems. Título: Anomalies, Rare Events, and Brownian Motion. Resumen: In one of his celebrated 1905 papers, Albert Einstein proposed for the first time a statistical interpretation of Robert Brown’s innocent observation based on the corpuscular constitution of matter. His theory stated that the long-time motion of a Brownian particle is diffusive whereas the probability distribution of the particle displacement is Gaussian. For more than one hundred years these predictions were systematically validated on real systems and the coexistence between Diffusivity and Gaussianity became a paradigm. However, recent experiments on mesoscopic particle systems have claimed the existence of a time regime where diffusion is not accompanied by a purely Gaussian distribution of displacements. In this talk I will discuss these recent observations as well as those minimal stochastic models proposed to rationalize the new intriguing experimental phenomenology. Using molecular dynamics simulations I will further discuss the emergence of the hypothetical diffusive yet non-Gaussian regime in glass- and gel-forming liquids. I will conclude my talk by exploring the connection between non-Gaussian dynamics and system topology. Lugar: Seminario de Física Computacional (aula F1). Departamento de Física de la Materia. Facultad de Ciencias. Fecha y hora: Jueves 8 de Noviembre. 12:00. Atentamente, --------------------------------------------------------------------------------- Daniel Manzano Electromagnetism and Condensed Matter Department University of Granada Facultad de Ciencias, Av. Fuentenueva s/n Granada 18071, Spain Phone: +34 958241000 Ext: 20569 http://ic1.ugr.es/manzano/ <http://ic1.ugr.es/manzano/>

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