IPM Calendar 
Sunday 15 December 2019   Today  
Events for day: Wednesday 04 December 2019    
           13:30 - 15:00     Weekly Seminar
Physical gauge transformations in gravity and gauge theories

School
ASTRONOMY

In this talk, I will give a pedagogical review on the topic of large gauge transformations. To this end, I start with the simple particle mechanics and construct the solution space and its symplectic structure. Then give a definition of symmetry which is completely universal and can be extended to field theories. We will then see that in field theory this leads to the resolution that some of the gauge transformations are not redundancies and are just physical and this is related to the presence of boundaries. I will finish up by trying to review some physics behind these physical gauge transformations in high energy physics and cosmology ...

           14:00 - 15:00     Weekly Seminar
Condensed Matter and Statistical Physics Group
Artificial Leaves for Solar Fuel Generation

School
PHYSICS

Seminar Room (classroom A), Farmanieh Building, IPM ...

           14:00 - 15:00     Weekly Seminar
Artificial Leaves for Solar Fuel Generation

School
NANO SCIENCES

Artificial Leaves for Solar Fuel Generation

Abstract:

Artificial leaf is a term coined for self-sustained devices that can generate fuel from energy of the sun. A process for this purpose is splitting water into hydrogen and oxygen where hydrogen can be used directly as fuel or can be converted into higher density fuels after reaction with CO2. Low-cost generation of hydrogen is the challenge. In IPM, we have developed a low-cost device based on standard silicon solar cell technology and earthabundant electrocatalysts that can split water with >11% solar to hydrogen conversion efficiency. This efficiency is ...

           14:00 - 15:00     Weekly Seminar
Combinatorics and Computing
Spectral gap and a conjecture by Aldous and Fill

School
MATHEMATICS

Spectral gap and a conjecture by Aldous and Fill ...

           15:00 - 16:00     Weekly Seminar
Beyond The Standard Model from Holography

School
PARTICLES AND ACCELERATORS

Abstract: We consider a SU(Nc) non-abelian gauge theory with Nf fermions in the fundamental representation and show that as Nf varies the theory can display IR conformal windows and walking couplings. We describe this exotic gauge dynamics with the holographic Dynamic AdS/QCD model. In addition Nambu
Jona-Lasinio (NJL) four quark interactions can be included using Witten
s multitrace prescription and their effect on the condensation will be described. Interestingly, one realizes a light Higgs-like state in ideal walking models where a combination of slowly running gauge dynamics and an NJL term trigger chiral symmetry breaking. ...