- Materia-seminarios

Recordatorio de Seminario
by Daniel Manzano 21 Feb '19

21 Feb '19

El grupo de Física Estadística y de los Sistemas Complejos les invita a asistir al siguiente seminario. Título: Quantum transport on lattices Ponente: Daniel Manzano. Resumen: Quantum transport in lattices is a major field of study nowadays. It has been probed that a lattice composed by harmonic oscillators connected to two thermal baths at different temperatures behaves ballistically in any dimension [1]. On the other hand, if the lattice is composed by spins it is ballistic only in the one-dimensional case [2, 3]. In the simplest two-dimensional spin lattice, a ladder, it has been numerically probed the existence of both ballistic and non-ballistic channels [4]. In this talk, I will show that both fermionic and bosonic uniform d-dimensional lattices can be reduced to a set of independent one-dimensional chains [5]. This reduction leads to the expression for ballistic energy fluxes in uniform fermionic and bosonic lattices. By the use of the Jordan-Wigner transformation, we can extend our analysis to spin lattices, proving the coexistence of both ballistic and non-ballistic subspaces in any dimension and for any system size. We then relate the nature of transport to the number of excitations in the homogeneous spin lattice, indicating that a single excitation always propagates ballistically and that the non-ballistic behaviour of uniform spin lattices is a consequence of the interaction between different excitations. References: [1] A. Asadian, D. Manzano, M. Tiersch, and H.J. Briegel. Phys. Rev. E 87, 012109 (2013) [2] M. Znidaric. Phys. Rev. E 83, 011108 (2011). [3] D. Manzano, M. Tiersch, A. Asadian, and H.J. Briegel. Phys. Rev. E 86, 061118 (2012). [4] M. Znidaric. Phys. Rev. Lett. 110, 070602 (2013). [5] D. Manzano, C. Chuang, and J. Cao. New J. Phys. 18, 043044 (2016). Día y hora: Viernes 22 de Febrero a las 12:00 Lugar: Aula de informática. Departamento de Física de la Materia. Planta baja del edificio de Física. Facultad de Ciencias. https://ic1.ugr.es/eventos/wp/seminariosinternos16/2019/02/13/quantum-trans… <https://ic1.ugr.es/eventos/wp/seminariosinternos16/2019/02/13/quantum-trans…> --------------------------------------------------------------------------------- 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: "Quantum transport on lattices"
by Daniel Manzano 13 Feb '19

13 Feb '19

Día y hora: Viernes 22 de Febrero a las 12:00 Lugar: Aula de informática. Departamento de Física de la Materia. Planta baja del edificio de Física. Facultad de Ciencias. Ponente: Daniel Manzano. Título: Quantum transport on lattices Abstract: Quantum transport in lattices is a major field of study nowadays. It has been probed that a lattice composed by harmonic oscillators connected to two thermal baths at different temperatures behaves ballistically in any dimension [1]. On the other hand, if the lattice is composed by spins it is ballistic only in the one-dimensional case [2, 3]. In the simplest two-dimensional spin lattice, a ladder, it has been numerically probed the existence of both ballistic and non-ballistic channels [4]. In this talk, I will show that both fermionic and bosonic uniform d-dimensional lattices can be reduced to a set of independent one-dimensional chains [5]. This reduction leads to the expression for ballistic energy fluxes in uniform fermionic and bosonic lattices. By the use of the Jordan-Wigner transformation, we can extend our analysis to spin lattices, proving the coexistence of both ballistic and non-ballistic subspaces in any dimension and for any system size. We then relate the nature of transport to the number of excitations in the homogeneous spin lattice, indicating that a single excitation always propagates ballistically and that the non-ballistic behaviour of uniform spin lattices is a consequence of the interaction between different excitations. References: [1] A. Asadian, D. Manzano, M. Tiersch, and H.J. Briegel. Phys. Rev. E 87, 012109 (2013) [2] M. Znidaric. Phys. Rev. E 83, 011108 (2011). [3] D. Manzano, M. Tiersch, A. Asadian, and H.J. Briegel. Phys. Rev. E 86, 061118 (2012). [4] M. Znidaric. Phys. Rev. Lett. 110, 070602 (2013). [5] D. Manzano, C. Chuang, and J. Cao. New J. Phys. 18, 043044 (2016). Un saludo, --------------------------------------------------------------------------------- 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: "Evolution in host-pathogen systems: emergent trade-offs and self-evolved criticality"
by Daniel Manzano 17 Dec '18

17 Dec '18

El grupo de Física Estadística y de los Sistemas Complejos les invita al siguiente seminario: Ponente: Víctor Buendía. Título: Evolution in host-pathogen systems: emergent trade-offs and self-evolved criticality. Resumen: Understanding how evolution works is an open question in ecological systems. In the last years there has been an effort to understand host-parasite systems. Despite the advances in the field of computational epidemiology, there are many features of the observed viral strains that we cannot understand yet: why are most viruses mild? How does natural selection operate in these systems? How does co-evolution with host emerges? In this talk, I will review a stochastic evolutionary model that displays an emergent trade-off between transmission and virulence by a self-organization mechanism, called "self-evolved criticality". I will show how this self-evolved criticality regulates the virulence of the epidemy, making it mild, and how extensions of this model can give new insights into the field of evolutionary biology. Fecha y hora: Martes 18 de Diciembre, 12:00 horas. Lugar: Seminario de Física estadística. Planta baja del edificio de Física. Facultad de Ciencias. Más información: https://ic1.ugr.es/eventos/wp/seminariosinternos16/2018/12/11/evolution-in-… 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 Martes 18 de Diciembre.
by Daniel Manzano 11 Dec '18

11 Dec '18

Hola a todos, os informo del próximo seminario del departamento, que será el último del año 2018 (Atentos al cambio de día). Ponente: Víctor Buendía. Título: Evolution in host-pathogen systems: emergent trade-offs and self-evolved criticality. Resumen: Understanding how evolution works is an open question in ecological systems. In the last years there has been an effort to understand host-parasite systems. Despite the advances in the field of computational epidemiology, there are many features of the observed viral strains that we cannot understand yet: why are most viruses mild? How does natural selection operate in these systems? How does co-evolution with host emerges? In this talk, I will review a stochastic evolutionary model that displays an emergent trade-off between transmission and virulence by a self-organization mechanism, called "self-evolved criticality". I will show how this self-evolved criticality regulates the virulence of the epidemy, making it mild, and how extensions of this model can give new insights into the field of evolutionary biology. Fecha y hora: Martes 18 de Diciembre, 12:00 horas. Un saludo, --------------------------------------------------------------------------------- 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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Charla IC1. Daniel Manzano
by Daniel Manzano 05 Dec '18

05 Dec '18

Hola, os recuerdo que la semana que viene no habrá seminario. En su lugar yo daré una charla en el ciclo del IC1 el viernes a las 12:30. Un saludo, --------------------------------------------------------------------------------- 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: 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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