20 NOV 2019
16:00 - 17:00

Farmanieh Conference Hall

20 NOV 2019
15:00 - 16:00

Abstract: I will review the recent progresses in counting AdS black holes microstates using supersymmetric localization and holography.


Larak Seminar Room

20 NOV 2019
14:00 - 15:00

Seminar Room (classroom A), Farmanieh Building, IPM

18 NOV 2019
11:00 - 12:00


Larak Seminar Room

14 NOV 2019
11:00 - 12:00

Abstract: We use the path integral optimization approach of Caputa, Kundu, Miyaji, Takayanagi and Watan-abe to find the time slice of geometries dual to vacuum, primary and thermal states in the TTde-formed two-dimensional CFTs. The obtained optimized geometries actually capture the entire bulk which fits well with the integrability and expected UV-completeness ofTT-deformed CFTs. When the deformation parameter is positive, these optimized solutions can be reinterpreted as geometries at finite bulk radius, in agreement with a previous proposal by McGough, Mezei, and Verlinde. We also calculate the holographic entanglement entropy and quantum state complexity for these solutions. We show that the complexity of formation for the thermofield double state in the deformed theory is UV finite and it depends on the temperature.


Larak Seminar Room

13 NOV 2019
16:00 - 17:00

Microfluidic Devices for 2D and 3D Cell Migration in Controllable Microenvironments

Abstract:

Microfluidic devices have received wide attention and shown great potential in the
field of tissue engineering and regenerative medicine. Investigating cell response to
various stimulations is much more accurate and comprehensive with the aid of
microfluidic devices. In this study, we introduce a microfluidic device by which the
matrix density as a mechanical property and the concentration profile of a
biochemical factor as a chemical property could be altered. Our microfluidic device
has a cell tank and a cell culture chamber to mimic both 2D to 3D and 3D to 3D
migration of three types of cells. Fluid shear stress is negligible on the cells and a
stable concentration gradient can be obtained by diffusion. The device was
designed by a numerical simulation so that the uniformity of the concentration
gradients throughout the cell culture chamber was obtained. Adult neural cells were
cultured within this device and they showed different branching and axonal
navigation phenotypes within varying nerve growth factor (NGF) concentration
profiles. Neural stem cells (NSCs) were also cultured within varying collagen matrix
densities while exposed to NGF concentrations and they experienced 3D to 3D
collective migration. By generating vascular endothelial growth factor (VEGF)
concentration gradients, adult human dermal microvascular endothelial cells
(HDMVECs) were also migrated in a 2D to 3D manner and formed a stable lumen
within a specific collagen matrix density. It was observed that a minimum absolute
concentration and concentration gradient was required to stimulate migration of all
types of the cells. This device has the advantage of changing multiple parameters
simultaneously and is expected to have wide applicability in cell studies.

13 NOV 2019
15:00 - 16:00

Abstract: After a brief introduction of stochastic inflation, I explain the concept of boundary crossing and some tools for its calculation. Then I will present some results including the critical dependence of boundary-crossing probability on the number of fields.


Larak Seminar Room

13 NOV 2019
14:00 - 15:00

The interaction of light and nanoparticles, quantum dots, and quantum rings
Abstract:

Many studies are devoted to the interaction of light and matter. First I remind some
basic points such as light scattering, optical activity, and optical properties of excitons.
Then I introduce recent works of our group on hybrid quantum dot-nanoparticle
systems, terahertz radiation, quantum rings, and magnetic hotspots.

13 NOV 2019
11:00 - 13:00

Venue:
School of Cognitive Sciences, Institute for Research in Fundamental Sciences (IPM),
Opposite the ARAJ, Artesh Highway, Tehran, Iran

Abstract:


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13 NOV 2019
14:00 - 15:00

Venue : Seminar Roo m (classroom A), Farmanieh Building, IPM
Organized by: School of Nano Science