Category: Doctoral defence

Lukas Schneiderbauer

Valentina Giangreco, September 24, 2020

PhD defense, Friday September 25 at 14.00, in Veröld, room 023

Semi-Classical Black Hole Holography 

The defense will be streamed: https://www.youtube.com/user/HIvarp/live

Dissertation title: Semi-Classical Black Hole Holography 

Opponents: Dr. Veronika Hubeny, Professor of Physics at UC Davis,USA
Dr. Mukund Rangamany, Professor of Physics at UC Davis, USA

Advisor: Dr. Lárus Thorlacius, Professor at the Faculty of Physical Sciences, University of Iceland

Doctoral committee: Dr. Bo Sundborg, Professor at the Department of Physics at Stockholm University, Sweden
Dr. Valentina Giangreco M. Puletti, Professor at the Faculty of Physical Sciences, University of Iceland
Dr. Þórður Jónsson, Professor at the Faculty of Physical Sciences, University of Iceland

Chair of Ceremony: Dr. Einar Örn Sveinbjörnsson, Professor and the Head of the Faculty of Physical Sciences, University of Iceland

Abstract:
This thesis discusses two aspects of semi-classical black holes.
First, a recently improved semi-classical formula for the entanglement entropy of
black hole radiation is examined. This entropy is an indicator of information loss and determines whether black hole evaporation is an information preserving process or destroys quantum information. Assuming information conservation, Page expressed the entanglement entropy as a function of time, which is referred to as the “Page curve.” Using the improved formula for evaporating black hole solutions of a gravitational model introduced by Callan, Giddings, Harvey and Strominger (CGHS) and modified by Russo, Susskind and Thorlacius (RST), we find that the entanglement entropy follows the Page curve and thus is consistent with unitary evolution.
Second, the notion of quantum complexity is explored in the context of black holes. The quantum complexity of a quantum state measures how many “simple operations” are needed to create that state. Susskind conjectured that the quantum complexity of a black hole state corresponds to a certain volume inside the black hole. A modified conjecture equates the quantum complexity with the gravitational action evaluated for a certain region of spacetime which intersects the black hole interior. We test the complexity conjectures for semi-classical black hole solutions in the CGHS/RST model and find that both conjectures yield the expected behavior.

Doctoral defence – Warsha Singh

Benedikt Magnússon, June 12, 2015
When: Friday, June 12, 2015 – 10:00
Location details: The Aula

Háskóli ÍslandsOn Friday the 12th of June Warsha Singh will defend her Ph.D. thesis in Ecological Modelling. The thesis is titled: Towards efficient benthic survey design with the use of Autonomous Underwater Vehicles.

The defence will take place in the Aula at the Main Building and starts at 10:00

Opponents are dr. Michael Fogarty, Chief of the ecosystem management program, Northeast fisheries science center, USA and dr. Arthur Trembanis – Associate professor of oceanography and geological sciences, University of Delaware, USA.

The supervisor is dr. Gunnar Stefánsson, Professor at the Faculty of Physical Sciences at the University of Iceland. The doctoral committe also includes Dr. Erla Björk Örnólfsdóttir, Dean of Hólar University College, dr. Jörundur Svavarsson, Professor at the Faculty of Life and Environmental Sciences, University of Iceland and dr. Tómas Phillip Rúnarsson , Professor at the Faculty of Industrial Engineering, Mechanical Engineering and Computer Science , University of Iceland.

The ceremony will be chaired by dr. Hafliði Pétur Gíslason, Professor and the head of Faculty of Physical Sciences at the University of Iceland

Abstract
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Doctoral defence in Statistics – Anna Helga Jónsdóttir

Benedikt Magnússon, April 16, 2015
When: Friday, April 17, 2015 – 14:00
Location: The Aula, Aðalbygging – Main building
anna_helgaOn Friday the 17th of April Anna Helga Jónsdóttir will  defend her Ph.D. thesis in Statistics. The thesis is titled: Development and testing of an open learning environment to enhance statistics and mathematics education.

The defence will take place in the Aula at the Main Building and starts at 14:00.

Opponents are dr. Per B. Brockhoff, Professor at the Technical University of Denmark and dr. Robert C. delMas, Associate professor at the University of Minnesota.

The supervisor is dr. Gunnar Stefánsson, Professor at the Faculty of Physical Sciences at the University of Iceland. The doctoral committe also includes dr. Freyja Hreinsdóttir. Associate professor at the University of Iceland and dr. Auðbjörg Björnsdóttir. Director of the Centre of Teaching at the University of Akureyri.

The ceremony will be chaired by dr. Oddur Ingólfsson, Professor and Vice Head of the Faculty of Physical Sciences at the University of Iceland.

Abstract

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