# Talks/Seminars

Here you find the upcoming and past talks and colloquia. The colour code and abbreviations:
 Seminar of the Institute Quantum Theory Seminar General Relativity Seminar Video seminar of the SFB Colloquium of the Faculty Other Talks Seminar of Research Training Group

HS: Hörsaal (Lecture Hall), SR: Seminarraum (Seminar room), URZ Universitätsrechenzentrum (Computer Center)

### Calendar

March 2015
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April 2015
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You can also access a full calendar with extended functionality.

### Past Talks

Talks from 2014-10-01 up to Today
 Thu, 2015-03-26 12:00 (HS 2, Abbeanum) Kugelsymmetrischer Gravitationskollaps in der Einstein-Maxwell-TheorieVerteidigung der Masterarbeit von Andreas Schoepe Fri, 2015-03-06 16:15 (HS 2, Abbeanum) Das Spätzeitverhalten relativistischer Wellen (Masterverteidigung)Martin Becker, FSU Jena Wed, 2015-01-28 17:15 (Seminarraum HI Jena, Fröbelstieg 3) Lightlike inhomogenities in worldline pair creationDr. Anton Ilderton, Chalmers University Göteborg The locally constant field approximation (LFCA) is commonly used to calculate the nonperturbative pair production probability in electromagnetic fields. In certain classes of fields, for example longitudinal electric fields depending on lightfront time, the LCFA is known to be exact. Using the worldline description of the effective action, we show that the reason for this is closely tied to the zero-mode problem of lightfront quantisation, and the so-called “triviality” of the lightfront vacuum. Tue, 2015-01-27 16:15 (SR 5, Helmholtzweg 4) The Callias Index Theorem Revisited Dr. Marcus Waurick, Technische Universität Dresden Wed, 2015-01-21 16:15 (HS 2, Abbeanum) New Frontiers in integrated photonics: supersymmetry and unphysical phenomenaProf. Dr. Alexander Szameit, IAP Universität Jena Tue, 2015-01-20 16:15 (SR 5, Helmholtzweg 4) Asymptotic Safety in GravityDr. Astrid Eichhorn, Imperial College London Wed, 2015-01-14 16:00 (SR 309, Carl-Zeiß-Str. 3) From Schwarzschild to General Relativity: modeling physical phenomena with the help of geometryDr. Carla Cederbaum, Universität Tübingen Tue, 2015-01-13 16:15 Spectral theory for continuum one-dimensional quasicrystal models Dr. Christian Seifert, Technische Universität Hamburg-Harburg We consider an ergodic family $(H_\omega)_{\omega\in\Omega}$ of continuum one-dimensional Schr\"odinger operators, where we allow for measures as potentials. We show that the random operator $H$ has Cantor type spectra of Lebesuge measure zero under suitable finite local complexity conditions on the potentials. Such operator families appear in the study of quasicrystalline models. Thu, 2015-01-08 14:15 (SR 5, HH 4, instead of the quantum theory seminar) Perturbative Quantum Gravity IIIProf. Ilya Shapiro Universidade Federal de Juiz de Fora Wed, 2015-01-07 16:15 (HS 2, Abbe., instead of the seminar of the institute) Perturbative Quantum Gravity IIProf. Ilya Shapiro Universidade Federal de Juiz de Fora Tue, 2015-01-06 16:15 (SR 5, Helmholtzweg 4) Perturbative Quantum Gravity IProf. Ilya Shapiro Universidade Federal de Juiz de Fora Thu, 2014-12-18 14:15 Critical behavior in spherical and hyperbolic spaceDr. Dario Benedetti (AEI Potsdam) Wed, 2014-12-17 16:15 A Simple Proof of the Kochen-Specker Theorem on the Problem of Hidden VariablesProf. Norbert Straumann, Universität Zürich Tue, 2014-12-16 16:15 (SR 5, Helmholtzweg 4) Rendering integrands positive - subset method for lattice QCD at high densityDr. Falk Bruckmann Universität Regensburg Wed, 2014-12-10 16:00 (HS 2, Abbeanum) apl.: AG Fachdidaktik der Physik und AstronomieProf. Lotze Tue, 2014-12-09 16:15 (SR 5, Helmholtzweg 4) (Non)-Fermi LiquidsDr. Tilman Enss Ruprecht-Karls-Universität Heidelberg Fri, 2014-12-05 11:30 (Rosensäle) Binary neutron stars: what we understand and what we don'tFrom Luciano Rezzolla for the GWA14 conference I will review the recent progress made in modelling binaries of compact stars and the role played by magnetic fields and the equation of state in their evolution. Special attention will be paid to highlighting how the progress of ab-initio fully relativitistic calculations can be used to explain several aspects of the phenomenology of short gamma-ray burst, but also how new observations on the X-ray afterglows represent new riddles for the theoretical modeling. Fri, 2014-12-05 10:00 (Rosensäle) Constraining the nature of gravitational waves with binary pulsar experimentsFrom Paulo Freire for the GWA14 conference In this talk I present some recent pulsar timing experiments for double neutron stars that test general relativity's quadrupolar gravitational wave emission formula with unprecedented precision. I then present the results of timing of millisecond pulsar - white dwarf systems that severely constrain the emission of dipolar gravitational waves (DGW) for a wide range of neutron star masses. Apart from constraining (and in some cases excluding) alternative theories of gravity that predict DGW emission, these results reinforce our confidence in the templates being used to search for the GW signal of NS-NS and NS-BH inspiral events in the advanced LIGO and Virgo detectors. Fri, 2014-12-05 09:00 (Rosensäle) Highest order post-Newtonian dynamics of non-spinning and spinning compact binaries in general relativityFrom Gerhard Schäfer for the GWA14 conference The talk delivers insight into the calculations of highest order post-Newtonian (PN) Hamiltonians for binary black holes. The conservative dynamics is presented up to 4 PN order for binaries with both non-spinning and spinning components, where the spins are counted of 0.5 PN order. The related dissipative radiation reaction dynamics is known up to 4.5 PN order. As application, the Innermost Stable Circular Orbit for spinless binaries is given through 4 PN order and the test-body limit is compared with the exactly known ISCO of a test-body orbiting a Schwarzschild black hole. Thu, 2014-12-04 10:00 (Rosensäle) Binary black holes: Waveform modeling and two-body dynamicsFrom Harald Pfeiffer for the GWA14 conference This talk will introduce the Spectral Einstein Code, a general relativistic code to solve the inspiral and merger of two black holes. I will give an update on numerical results with SpEC, and will discuss several applications of the simulations, among them the construction of waveform models within the effective-one-body formalism, the study of gravitational self-force effects through comparable-mass binary black hole simulations, and a comparison of the post-Newtonian precession dynamics with numerical simulations. Thu, 2014-12-04 09:00 (Rosensäle) Gravitational waves from coalescing neutron star binariesFrom Masaru Shibata for the GWA14 conference Wed, 2014-12-03 10:00 (Rosensäle) Post-merger Oscillations in Binary Neutron Star Mergersfrom Nikolaos Stergioulas for the GWA14 conference Because of the recent discovery of two-solar-mass neutron stars, the equation of state of high density matter is likely to be sufficiently stiff to allow for a long-lived remnant, when two neutron stars merge. The merger excites a number of oscillation modes, having large (nonlinear) amplitude, that are interesting as gravitational waves sources for second- and third-generation interferometric detectors. Apart from a dominant linear oscillation mode, additional nonlinear contributions appear. I discuss the main properties of these oscillations as well as the prospects of constraining the mass and radius (and thus the equation of state) with future detections. Wed, 2014-12-03 09:00 (Rosensäle) Searching for gravitational waves from the early Universefrom Fabian Schmidt for the GWA14 conference Tue, 2014-12-02 11:30 (Rosensäle) Gravitational wave detection using squeezed lightfrom Roman Schnabel for the GWA14 Conference Current gravitational wave (GW) detectors are Michelson-type kilometre-scale laser interferometers measuring the distance changes between in vacuum suspended mirrors. The sensitivity of these detectors is limited by quantum noise of the laser light. Since 2010, GEO600 has been using so-called nonclassical light that has a ‘squeezed’ quantum noise, and it has been demonstrated that squeezed light is able to increase the GW detector sensitivity at shot-noise limited frequencies. In future, squeezed light might be used to further improve the sensitivity of GW detectors, then also at radiation pressure noise dominated frequencies and at frequencies where photon-phonon scattering is limiting the detectors performance. Tue, 2014-12-02 10:00 Gravitational waves from black-hole binariesfrom Mark Hannam for the GWA14 Conference Tue, 2014-12-02 09:00 Progress in Three-dimensional Supernova Modelingfrom Hans-Thomas Janka for the GWA14 conference 3D supernova simulations have become possible only very recently and have already led to the discovery of novel and unexpected phenomena, although they still need to confirm the basic theoretical concepts of the explosion mechanism. The talk will review the status of 3D modeling and interesting new perspectives to probe the supernova core dynamics by neutrinos and gravitational waves measured in the case of a next galactic event. Mon, 2014-12-01 19:00 (Max-Wien-Platz 1, Lecture Hall 1) Gravitationswellenastronomie: Bald Neues von der dunklen Seite des Universums! Public Talk of the GWA14 Conference from Karsten Danzmann Können wir das Universum hören? Auf den ersten Blick ist das eine unsinnige Frage, denn natürlich gibt es im Weltall keine Luft, in der sich der Schall ausbreiten könnte. Wenn aber un­sere Ohren nur empfindlich genug wären, dann könn­ten sie auf eine besondere Art von Wellen reagieren: auf Gravitationswellen! Vor mehr als 90 Jahren sagte Al­bert Einstein die Existenz von Gravitationswellen als Konsequenz seiner allgemeinen Relativitätstheorie vor­aus. Gravitationswellen sind winzige Verbiegungen des Raumes und der Zeit, die von schnellbewegten, großen Massen erzeugt werden und sich mit Lichtgeschwindig­keit wellenförmig ausbreiten. Sie wurden noch nie di­rekt nachgewiesen. Mehrere laserinterferometrische Gravitationswellendetektoren mit Armlängen von Ki­lometern werden gegenwärtig auf der Erde betrieben, um Gravitationswel­len zu erforschen, darunter auch GEO600 in der Nähe von Hannover. Bald folgen Detektoren im Weltraum mit Millionen km Armlänge, insbesondere die Satelliten-Mission LISA. Ausgangspunkt für diese geheimnis­vollen Wellen könnten z. B. verschmelzende Doppel­sterne, Neutronensterne, Supernovae, Schwarze Löcher und der Urknall sein. Ihre Beobachtung erfordert modernste Lasertechnologie und Messungen an der quantenmechanischen Nachweisgrenze. Mon, 2014-12-01 15:00 (Rosensäle) Beyond the second generation of gravitational wave detectorsfrom Ronny Nawrodt for the GWA14 Conference Gravitational wave detectors are currently upgraded to the 2nd generation achieving extremely high sensitivities in a wide frequency band. A first direct detection of gravitational waves is expected once these instruments are getting online. Such a detection will mark the starting point for a gravitational wave based astronomy. Thus, detectors of the third generation are designed to be used as efficient astronomical observatories. For this purpose the sensitivity of the 2nd generation detectors has to be enhanced. As the sensitivity of current instruments approaches the thermal noise floor of their fused silica components a radical change of materials is necessary. Additionally, 3rd generation detectors will be operated at cryogenic temperatures to further reduce thermal noise and increase their sensitivity. This talk will give an overview of proposed technologies towards 3rd generation detectors leading to a 10 times higher sensitivity throughout the audio band. The focus will lie on the selection of materials for the optics as well as the suspension elements according to their properties. The characterisation of these materials and the choice of their operational temperature is discussed as well. Mon, 2014-12-01 14:00 From the beginning to the second generation of gravitational wave detectorsfrom David Shoemaker for the GWA 2014 Conference A brief history of gravitational wave detection using laser interferometers will be given, followed by a status report on one example of the second generation of detectors, Advanced LIGO. Tue, 2014-11-25 16:00 (SR 5, Helmholtzweg 4) Dark energy and the uniqueness of general relativityProf. Matthias Bartelmann Ruprecht-Karls-Universität Heidelberg Thu, 2014-11-20 14:15 Hamiltonian approach to QCD in Coulomb gauge: From the vacuum to finite temperaturesProf. Dr. Hugo Reinhardt, Universität Tübingen Wed, 2014-11-19 16:15 (HS 2, Abbeanum) Lightfront quantisation and strong field QEDGreger Torgrimsson (Chalmers) Fri, 2014-11-14 16:00 (HS 2, Abbeanum) Ab Initio Simulationen zur Struktur und Dynamik warmer dichter AluminiumplasmenHannes Rüter, MSc, Universität Rostock Thu, 2014-11-13 14:15 Non-Equilibrium Dynamics of a Holographic SuperfluidAndreas Samberg, Ruprecht-Karls-Universität Heidelberg Thu, 2014-11-06 14:15 Can effects of quantum gravity be observed in the CMB?Prof. Claus Kiefer, University Cologne Tue, 2014-11-04 16:15 (SR 5, Helmholtzweg 4) Supersymmetric Yang Mills TheoriesDr. Georg Bergner, Universität Bern Tue, 2014-10-28 16:15 (SR 5, Helmholtzweg 4) Coupling constant metamorphosis and conformally covariant Laplacians Dr. Jonathan Kress (University of New South Wales, Sydney)

### Calendar

March 2015
Su Mo Tu We Th Fr Sa
01 02 03 04 05 06 07
08 09 10 11 12 13 14
15 16 17 18 19 20 21
22 23 24 25 26 27 28
29 30 31 01 02 03 04

### Upcoming Events

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