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Seminars

Initial Conditions for Inflation

Thursday, 13.02.2020 16:00

Paolo Creminelli (ICTP, Trieste)

Abstract: Cosmic inflation makes the universe flat and homogeneous, but under which conditions inflation will start? I will discuss some analytical results that show, with very weak assumptions, that inflation starts somewhere and some (partial) results about a de Sitter ho-hair theorem.

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Chirally coupled nanomagnets

Monday, 17.02.2020 11:00

Aleš Hrabec (ETH Zurich & Paul Scherrer Institut, Switzerland)

Magnetically coupled nanomagnets have many potential applications. In order to realize functional two-dimensional networks of coupled nanoscale magnetic elements, it is desirable to engineer effective lateral magnetic couplings in a controllable way. I will show that we are able to develop a method to control the lateral coupling between adjacent magnetic nanostructures based on the interfacial Dzyaloshinskii-Moriya interaction (DMI). We have patterned regions with in-plane (IP) and out-of-plane (OOP) magnetic anisotropy in a magnetic element using selective oxidation of Pt/Co/Al films, and the magnetization in the OOP and IP parts of the islands are coupled via DMI arising from the Pt underlayer. This results in chirally coupled magnetization. We have exploited this concept for various applications.

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Model agnostic approaches to cosmology

Thursday, 20.02.2020 16:00

Georgios Loukes-Gerakopoulos (Astronomical Institute of the Czech Academy of Sciences, Prague)

Abstract: In this talk three different studies we have undertaken to address cosmological issues, like dark energy, will be presented and their results will be discussed. In these studies we have tried to remain model agnostic as much as possible. In particular, our first study (arxiv:1902.11051) concerns a cosmic fluid obeying rest-mass conservation of unspecified equation of state (EoS) in an unspecified background assuming just that the fluid's speed of sound is positive and less than the speed of light. Our second study (arXiv:2001.00825) performs a dynamical analysis of a barotropic...

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Past seminars

Soutik Betal Magnetoelectric Nanorobot – A revolutionary nanoscale device for targeted treatment 04.02.2020 10:00
Yang Zhang Switchable magnetic bulk photovoltaic effect in the two-dimensional antiferromagnet CrI<sub>3</sub> 31.01.2020 14:00
Tomáš Ledvinka Dynamic vacuum spacetimes in a computer 30.01.2020 16:00
Harold Erbin Machine learning for QFT 29.01.2020 14:00
John Mangeri Advances in hierarchical materials property prediction of multiferroic compounds 28.01.2020 10:00
Christopher Clarkson Seminar Cancelled: General relativity in the era of large scale surveys 23.01.2020 16:00
Sang Hyun Park Developments of long term reliable high temperature thermoelectric devices 21.01.2020 14:00
Associate Professor Vadym Mochalin Nanodiamond: Synthesis, Properties, and Applications 16.01.2020 11:00
Associate Professor Vadym Mochalin 2D Transition Metal Carbides (MXenes): Synthesis, Properties, and Applications 16.01.2020 10:00
Pavel Baláž Static properties and current-induced magnetization dynamics of pinned 90° domain wall 14.01.2020 10:30

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