- semfis - Mailing lists@ IFISC

Reminder: Talk, TODAY - Tuesday, Jun 28, 2022 at 12:00
by semfis＠ifisc.uib-csic.es 28 Jun '22

28 Jun '22

Talk on Tuesday Jun 28, 2022 at 12:00 Place: Zoom Seminar Title: Convex optimization for non-equilibrium steady states on a hybrid quantum processor Speaker: Jonathan W. Z. Lau, CQT Singapur Abstract: Topic: MdMQuantumMeeting Join Zoom Meeting: <a href="https://uibuniversitat.zoom.us/j/94232467915" target="_blank">https://uibuniversitat.zoom.us/j/94232467915</a> Abstract: Finding the transient and steady state properties of open quantum systems is a central problem in various fields of quantum technologies. Here, we present a quantum-assisted algorithm to determine the steady states of open system dynamics. By reformulating the problem of finding the fixed point of Lindblad dynamics as a feasibility semi-definite program, we bypass several well known issues with variational quantum approaches to solving for steady states. We demonstrate that our hybrid approach allows us to estimate the steady states of higher dimensional open quantum systems and discuss how our method can find multiple steady states for systems with symmetries. Url event:https://ifisc.uib-csic.es/en/events/seminars/convex-optimization-for-non-equilibrium-steady-sta/

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Reminder: Talk, TODAY - Tuesday, Jun 28, 2022 at 14:00
by semfis＠ifisc.uib-csic.es 28 Jun '22

28 Jun '22

Talk on Tuesday Jun 28, 2022 at 14:00 Place: IFISC Seminar Room Title: Identifiability and prediction in ecological interaction network models Speaker: Leonardo Aguirre, Eawag, ETH-Domain Abstract: Abstract:&nbsp; Many processes in ecology are fundamentally driven by known interactions between individuals. Meanwhile the pressing questions, such as species extinction, are naturally posed at the system level. Mapping a microscopic agent-based description to a mesoscopic aggregate model is of course a highly non-trivial matter and generally introduces noise as a result of observing only certain selected degrees of freedom. One approach is to frame the mesoscopic dynamics as a continuous-time Markov chain whose states are accounts of taxa abundances and whose transitions are interaction events. Such &#39;Markovian interaction networks&#39; have previously risen to fame in systems biology as biochemical reaction networks and have likewise been a subject of theoretical ecology for over half a century. However they are not as widely adopted in experimental ecology studies as their infinite-population ODE counterparts. After reviewing the basics of Markovian interaction networks I wil l focus on their prediction theory which involves stochastic filtering and give a glimpse into an ongoing software project of developing a general solution to integrate Markovian interaction networks into experimental design protocols and facilitate the discourse between theorists and experimentalists around that subject. zoom link:&nbsp;https://us06web.zoom.us/j/85744990492?pwd=U3l3YUh6ZmNVUjNVOVV4dldxdHdVQT09 Url event:https://ifisc.uib-csic.es/en/events/seminars/identifiability-and-prediction-in-ecological-inter/

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Talk on Tuesday, Jun 28, 2022 at 12:00
by semfis＠ifisc.uib-csic.es 27 Jun '22

27 Jun '22

Talk on Tuesday Jun 28, 2022 at 12:00 Place: Zoom Seminar Title: Convex optimization for non-equilibrium steady states on a hybrid quantum processor Speaker: Jonathan W. Z. Lau, CQT Singapur Abstract: Topic: MdMQuantumMeeting Join Zoom Meeting: <a href="https://uibuniversitat.zoom.us/j/94232467915" target="_blank">https://uibuniversitat.zoom.us/j/94232467915</a> Abstract: Finding the transient and steady state properties of open quantum systems is a central problem in various fields of quantum technologies. Here, we present a quantum-assisted algorithm to determine the steady states of open system dynamics. By reformulating the problem of finding the fixed point of Lindblad dynamics as a feasibility semi-definite program, we bypass several well known issues with variational quantum approaches to solving for steady states. We demonstrate that our hybrid approach allows us to estimate the steady states of higher dimensional open quantum systems and discuss how our method can find multiple steady states for systems with symmetries. Url event:https://ifisc.uib-csic.es/en/events/seminars/convex-optimization-for-non-equilibrium-steady-sta/

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Master Thesis on Thursday, Jun 30, 2022 at 12:00
by semfis＠ifisc.uib-csic.es 27 Jun '22

27 Jun '22

Master Thesis on Thursday Jun 30, 2022 at 12:00 Place: IFISC Seminar Room Title: Coevolution in Coordination Games Speaker: Miguel Angel Gonzalez, IFISC (UIB-CSIC) Abstract: &nbsp; Advisors: Maxi San Miguel and Anxo Sanchez (UC3M) Jury: Tobias Galla, Maxi San Miguel and Raul Toral The master Thesis defense will take place in IFISC Semianr room and it will be simultaneously broadcasted via Zoom: <a class="moz-txt-link-freetext" href="https://zoom.us/j/98286706234?pwd=bm1JUFVYcTJkaVl1VU55L0FiWDRIUT09">https://zoom.us/j/98286706234?pwd=bm1JUFVYcTJkaVl1VU55L0FiWDRIUT09</a> Url event:https://ifisc.uib-csic.es/en/events/seminars/coevolution-in-coordination-games/

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Talk on Tuesday, Jun 28, 2022 at 14:00
by semfis＠ifisc.uib-csic.es 24 Jun '22

24 Jun '22

Talk on Tuesday Jun 28, 2022 at 14:00 Place: IFISC Seminar Room Title: Identifiability and prediction in ecological interaction network models Speaker: Leonardo Aguirre, Eawag, ETH-Domain Abstract: Abstract:&nbsp; Many processes in ecology are fundamentally driven by known interactions between individuals. Meanwhile the pressing questions, such as species extinction, are naturally posed at the system level. Mapping a microscopic agent-based description to a mesoscopic aggregate model is of course a highly non-trivial matter and generally introduces noise as a result of observing only certain selected degrees of freedom. One approach is to frame the mesoscopic dynamics as a continuous-time Markov chain whose states are accounts of taxa abundances and whose transitions are interaction events. Such &#39;Markovian interaction networks&#39; have previously risen to fame in systems biology as biochemical reaction networks and have likewise been a subject of theoretical ecology for over half a century. However they are not as widely adopted in experimental ecology studies as their infinite-population ODE counterparts. After reviewing the basics of Markovian interaction networks I will focus on their prediction theory which involves stochastic filtering and give a glimpse into an ongoing software project of developing a general solution to integrate Markovian interaction networks into experimental design protocols and facilitate the discourse between theorists and experimentalists around that subject. Url event:https://ifisc.uib-csic.es/en/events/seminars/identifiability-and-prediction-in-ecological-inter/

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IFISC Colloquium on Wednesday, Jun 29, 2022 at 14:30
by semfis＠ifisc.uib-csic.es 24 Jun '22

24 Jun '22

IFISC Colloquium on Wednesday Jun 29, 2022 at 14:30 Place: IFISC Seminar Room Title: Resilience and transitions of global complex urban systems Speaker: Céline Rozenblat, University of Lausanne (UNIL), Switzerland Abstract: In the context of the climate change and energetic and political crises, new tendencies in the long/medium term evolution of urban systems, together with new data and methods, require that existing theoretical assumptions and conceptualizations be challenged as global urban hierarchies are reconfigured. The connection between urban systems at different levels of organization becomes more and more relevant for understanding urban systems and their transitions. But the current inter-urban perspective is not sufficient to encompass these dynamics. The evolution of power distributions inside and between cities reshapes the world organization of central/peripheral cities and the complexity of the global urban system. Actors as multinational firms, or high-level innovation centers, participate actively in these reconfigurations that concentrate wealth, control, innovation, and attractiveness in a few cities. In the complexity of this multi-level system, how is regionalization of the world reshaping in a multipolar urban world? How does the multi-level perspective highlight some resilience properties? The methodologies derived from complex systems sciences bring new forms of intelligibility to worldwide urban transitions. The colloquium is presential with parallel zoom stream: https://zoom.us/j/98286706234?pwd=bm1JUFVYcTJkaVl1VU55L0FiWDRIUT09 Url event:https://ifisc.uib-csic.es/en/events/seminars/resilience-and-transitions-of-global-complex-urban/

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Reminder: IFISC Seminar, TODAY - Wednesday, Jun 22, 2022 at 14:30
by semfis＠ifisc.uib-csic.es 22 Jun '22

22 Jun '22

IFISC Seminar on Wednesday Jun 22, 2022 at 14:30 Place: Zoom Seminar Title: The role of non-conservative interactions in non-equilibrium stochastic systems Speaker: Sarah Loos, DAMTP Cambridge, and ICTP Trieste Abstract: The world surrounding us, including all living matter and various artificial complex systems, mostly operates far from thermal equilibrium. Recently, lively effort is dedicated in the fields of stochastic thermodynamics and statistical physics to unravel the fundamental principles that govern the individual and collective dynamics of such nonequilibrium systems, like the swarming of fish or flocking of birds. However, so far, little attention has been paid to the implications of non-conservative interactions, like time-delayed or non-reciprocal interactions. Such interactions emerge commonly in biological, chemical and feedback systems, and are widespread in engineering and machine learning. In this talk, I will use simple models to discuss technical challenges and unexpected physical phenomena induced by non-reciprocity [1] and time delay [2]. [1] Loos, Klapp, NJP (2020) [2] Loos, Klapp, Sci. Rep. (2019); Holubec, Geiss, Loos, Kroy, Cichos, PRL (2021) https://zoom.us/j/98286706234?pwd=bm1JUFVYcTJkaVl1VU55L0FiWDRIUT09 Url event:https://ifisc.uib-csic.es/en/events/seminars/the-role-of-non-conservative-interactions-in-non-e/

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[SPAM]There is an overdue payment under your name. Please, settle your debts ASAP.
by semfis＠ifisc.uib-csic.es 21 Jun '22

21 Jun '22

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Here is my last advice to you... in future you better ensure you stay away from this kind of situations! My advice - don't forget to regularly update your passwords to feel completely secure.

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IFISC Seminar on Wednesday, Jun 22, 2022 at 14:30
by semfis＠ifisc.uib-csic.es 17 Jun '22

17 Jun '22

IFISC Seminar on Wednesday Jun 22, 2022 at 14:30 Place: Zoom Seminar Title: The role of non-conservative interactions in non-equilibrium stochastic systems Speaker: Sarah Loos, DAMTP Cambridge, and ICTP Trieste Abstract: The world surrounding us, including all living matter and various artificial complex systems, mostly operates far from thermal equilibrium. Recently, lively effort is dedicated in the fields of stochastic thermodynamics and statistical physics to unravel the fundamental principles that govern the individual and collective dynamics of such nonequilibrium systems, like the swarming of fish or flocking of birds. However, so far, little attention has been paid to the implications of non-conservative interactions, like time-delayed or non-reciprocal interactions. Such interactions emerge commonly in biological, chemical and feedback systems, and are widespread in engineering and machine learning. In this talk, I will use simple models to discuss technical challenges and unexpected physical phenomena induced by non-reciprocity [1] and time delay [2]. [1] Loos, Klapp, NJP (2020) [2] Loos, Klapp, Sci. Rep. (2019); Holubec, Geiss, Loos, Kroy, Cichos, PRL (2021) https://zoom.us/j/98286706234?pwd=bm1JUFVYcTJkaVl1VU55L0FiWDRIUT09 Url event:https://ifisc.uib-csic.es/en/events/seminars/the-role-of-non-conservative-interactions-in-non-e/

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Reminder: Talk, TODAY - Thursday, Jun 16, 2022 at 11:00
by semfis＠ifisc.uib-csic.es 16 Jun '22

16 Jun '22

Talk on Thursday Jun 16, 2022 at 11:00 Place: IFISC Seminar Room Title: Hubs-biased advection-diffusion on undirected graphs. Speaker: Manuel Miranda Barrado, IFISC (CSIC-UIB) Abstract: Abstract: In certain real-world scenarios it is important to account for the influence of nearest neighbors on the diffusion of a particle located at a node of an undirected graph. To capture this influence the so-called hubs-biased Laplacians were proposed. We investigated the self-adjoint of these operators and discovered that they correspond to operators describing advective processes, where a degree-based drift pulls the diffusive particle from/towards the hubs. Advection operators were previously defined only for digraphs, where the direction of the edges ruled the drift, but the new operators that we present here act on undirected graphs. In this talk, we will explain how this new advective operators in undirected graphs are constructed, which properties do they have and which is its final configuration. Moreover, we will construct an advection-diffusion equation in which both processes &ldquo;compete&rdquo; in a graph. showing the analytic expression of the steady state of these processes. Finally, we will study how advection-diffusion shapes movement of the species L. catta when the foraging occurs in a patched landscape network in Southern Madagascar. Url event:https://ifisc.uib-csic.es/en/events/seminars/hubs-biased-advection-diffusion-on-undirected-grap/

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