IJS KOLOKVIJ, sreda, 29. 1. 2019, ob 13.00 uri, prof. dr. Nicola Spaldin

[natasa.gosevac at ijs.si]

Vabimo vas na 7. predavanje iz sklopa "Kolokviji na IJS" v letu 2019/20, ki bo v sredo, 29. januarja 2019, ob 13. uri v Veliki predavalnici Instituta »Jožef Stefan«  na Jamovi cesti 39 v Ljubljani. Napovednik predavanja najdete tudi na naslovu  <http://www.ijs.si/ijsw/Koledar_prireditev> http://www.ijs.si/ijsw/Koledar_prireditev, posnetke preteklih predavanj pa na  <http://videolectures.net/kolokviji_ijs> http://videolectures.net/kolokviji_ijs. 

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prof. dr. Nicola Spaldin

ETH Zurich, Zurich, Švica 

 

Od materialov do kozmologije: Raziskovati zgodnje vesolje z mikroskopom

Razkrivanje obnašanja zgodnjega vesolja kmalu po Velikem poku je vznemirljivo temeljno vprašanje, ki je izjemno zahtevno zaradi nepremostljivih težav, povezanih s rekonstrukcijo Velikega poka v laboratoriju. Ena od poti do odgovora – ki leži na križišču kozmologije in vede o materialih – se opira na laboratorijske materiale, s katerimi bi preskusili zakone nastanka defektov v zgodnjem vesolju, kakršne so kozmične strune. V predavanju bomo pokazali, da je heksagonalni itrijev manganit – priljubljeni multiferoični material, v katerem koeksistirajo magnetni, feroelektrični in struktrurni fazni prehodi – generira kristalografski ekvivalent kozmičnih strun. Opisali bomo, kako je mogoče s preprosto rešitvijo Schrödingerjeve enačbe za itrijev manganit identificirati in izmeriti pomembne značilnosti obnašanja tega materiala, ter predstavili eksperimentalne rezultate, ki so izgleda prva nedvoumna demonstracija pričakovanih kozmoloških skalirnih zakonov v dejanskem materialu. Zaključili bomo s prošnjo za pomoč pri slikanju multiferoičnih “kozmičnih strun” in predstavili nekaj zelo nedavnih podatkov, ki nakazujejo, da so stvari manj nedvoumne, kot se zdi.

Predavanje bo v angleščini.

Lepo vabljeni!

 

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We invite you to the 7th Institute colloquium in the academic year 2019/20. The colloquium will be held on Wednesday January 29, 2019 at 1 PM in the main Institute lecture hall, Jamova 39, Ljubljana. To read the abstract click   <http://www.ijs.si/ijsw/Koledar_prireditev> http://www.ijs.si/ijsw/Koledar_prireditev. Past colloquia are posted on   <http://videolectures.net/kolokviji_ijs> http://videolectures.net/kolokviji_ijs.

 

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prof. dr. Nicola Spaldin

ETH Zurich, Zurich, Switzerland

 

>From materials to cosmology: Studying the early universe under the microscope

 

Uncovering the behavior of the early universe just after the Big Bang is an intriguing fundamental activity that is extraordinarily difficult because of insurmountable issues associated with replaying the Big Bang in the laboratory.  One route to the answer – which lies at the intersection between cosmology and materials science – is to use laboratory materials to test the laws proposed for the formation of defects such as cosmic strings in the early universe. Here we will show that a popular multiferroic material, hexagonal yttrium manganite – with its coexisting magnetic, ferroelectric and structural phase transitions – generates the crystallographic equivalent of cosmic strings. We will describe how straightforward solution of the Schrödinger equation for yttrium manganite allows the important features of its behavior to be identified and quantified, and present experimental results of what seem to be the first unambiguous demonstration of the expected cosmological scaling laws in a real material. We will end with a plea for help with imaging the multiferroic “cosmic strings”, and show some very recent data suggesting that things might be less unambiguous than they seem.

 

Cordially invited!

 

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