141 events in 2021
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Seminar
Time-dependent driven quantum critical systems in (1+1) dimension
January 18 (Mon) at 10:00 - 11:15, 2021
Xueda Wen (Postdocs, Physics Department, Harvard University, USA)
10:00am ~ 11:15am on Jan. 18th, 2021 (JST) 8:00pm ~ 9:15pm on Jan. 17th, 2021 (EST) I will introduce an analytically solvable setup for time-dependent driven quantum critical systems in (1+1)D, whose low-energy physics are described by conformal field theories. In general, one may observe two different phases (heating and non-heating), where the correlation functions such as the entanglement entropy and energy-momentum density can be analytically solved. The dependence of phase diagrams on (i) the types of driving Hamiltonians and (ii) the types of driving sequences (such as periodic, quasi-periodic and random drivings) will be discussed.
Venue: via Zoom
Event Official Language: English
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Seminar
What are genes and how can we find them?
January 14 (Thu) at 10:00 - 11:00, 2021
Jeffrey Fawcett (Senior Research Scientist, iTHEMS)
Although 'gene' is a word that is used frequently in the society, most people probably do not know what genes actually are. In fact, its definition is not so straightforward. In this talk, I will first give a historical perspective and our current understanding of what genes are and what they look like. Then, I will talk about 'gene prediction'. Once we obtain the DNA (genome) sequence data of a given species, we must 'find' the genes within the genome. This involves computational prediction utilizing probabilistic models and various sources of external evidence. I will briefly explain how this is done.
Venue: via Zoom
Event Official Language: English
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Seminar
Accelerated equilibration in classical stochastic systems
January 13 (Wed) at 13:00 - 14:00, 2021
Kyosuke Adachi (Special Postdoctoral Researcher, iTHEMS / Special Postdoctoral Researcher, Nonequilibrium Physics of Living Matter RIKEN Hakubi Research Team, RIKEN Center for Biosystems Dynamics Research (BDR))
Shortcuts to adiabaticity (STA) [1] are processes that make a given quantum state evolve into a target state in a fast manner, which can be useful to avoid decoherence in quantum experiments. In this journal club, I will concisely review the concept of STA, and then focus on the recently proposed classical counterparts of STA, sometimes called engineered swift equilibration, in Brownian particle systems [2] and evolutionary systems [3].
Venue: via Zoom
Event Official Language: English
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Seminar
From local resynchronization to global pattern recovery in the zebrafish segmentation clock
January 7 (Thu) at 10:00 - 11:00, 2021
Koichiro Uriu (Assistant Professor, College of Science and Engineering, Kanazawa University)
Tissue-scale developmental patterns are often generated by local cellular interactions and global tissue deformation. An example is gene expression rhythms in vertebrate, termed the segmentation clock. The oscillatory spatial pattern of the segmentation clock across a tissue determines the timing of body segment formation. In this seminar, we discuss pattern recovery in the zebrafish segmentation clock after perturbation in oscillator coupling. To predict pattern recovery in embryos, we develop a physical model that describes both cell mechanics and genetic oscillations. We show that the physical model explains experimentally observed intermingled segmental defects, and their axial distributions in different embryonic developmental stages. Our analysis suggests that pattern recovery in developing tissues occurs at two scales; local pattern formation and transport of these patterns through tissue morphogenesis.
Venue: via Zoom
Event Official Language: English
141 events in 2021