|Thursday 2 July 2020|
|Events for day: Wednesday 19 June 2019|
| 13:30 - 15:00 Weekly Seminar|
Relation between solar magnetic activity and the global warming
The solar activity influences the earth climate as has been witnessed during the past little ice age and beyond. The prolonged duration of the recent activity minimum alarmed the community that a Maunder minimum is on the way. In this talk, I present a brief review of our understanding of the solar activity cycle. Then we study impact of the solar magnetic activity on the earth magnetosphere. After that, we discuss the solar effects on the global warming and explain what would happen if we enter a period of quenched activity in the upcoming decades as predicted in a recent study. ...
14:00 - 15:30 Special Seminar
Condensed Matter and Statistical Physics Group
A Conversation with Prof. N. Nafari
On the history of Condensed Matter Physics in Iran and his scientific career
Organized by A. Naji and L. Javidpour (IPM)
Date: 19 June, 2019, Time: 14:00
Place: Farmanieh Conference Hall, first floor ...
15:00 - 16:00 Weekly Seminar
A Minimal System Including Weak Sphalerons for Investigating the Evolution of Matter Asymmetries and Hypermagnetic Fields
PARTICLES AND ACCELERATORS
Abstract: We study simultaneous evolution of large scale hypermagnetic ?elds and the asymmetries of quarks, leptons and Higgs boson, in the temperature range 100GeV? T ? 10TeV. Above 10TeV, we identify all of the major fast interactions and use the associated conservation laws as constraints on the initial conditions at 10TeV. Below 10TeV, we identify the major processes which fall out of equilibrium or emerge as non-negligible processes and derive the relevant evolution equations. These include the Abelian anomalies which violate fermion numbers, direct and inverse Higgs decays that change the chiralities of fermions, and weak sphalerons whi ...
16:30 - 17:30 Monthly Colloquium
Dzyaloshinskii-Moriya interaction and its application in antiferromagnetic spintronics
The antisymmetric exchange interaction has been introduced more than 50 years ago by Dzyaloshinskii and Moriya to describe the weak magnetism observed in a few antiferromagnetic materials. The Dzyaloshinskii-Moriya interaction (DMI) breaks the chiral symmetry in magnetically ordered systems and leads to some exotic phenomena. In this talk, first, we revisit DMI and show how we can create DMI and control its strength in different magnetic thin films. We then discuss about its application in antiferromagnetic spintronics.
Venue:Farmaniyeh Bldg. Conference Hall. ...