Humboldt-Universität zu Berlin - Mathematisch-Naturwissen­schaft­liche Fakultät - Institut für Physik

12.06.2025 - Prof. Dr. Matthias Schott (Rheinische Friedrich-Wilhelms-Universität Bonn): A Global Network of Cavities to Search for High Frequency Gravitational Waves (GravNet)

Zeit: 13:00

Erwin Schrödinger-Zentrum, Rudower Chaussee 26, 12489 Berlin, Raum 0'119

Abstract: With the observation of gravitational waves (GWs) in 2015 by the terrestial interferometer LIGO, a new era of fundamental physics begun. Since then, a network of GW ground-based interferemeters has scrutinized the band of frequencies in the Hz to kHz range, finding almost hundred mergers of binaries of black holes or neutron stars. In 2023, a signal in the nHz band was discovered using the timing of radio signals from pulsars. The race for the exploration of other bands is one of the most active and potentially groundbreaking areas of physics. Accessing high frequency GWs (HFGWs), in the range kHz-GHz, is of high interest for multiple reasons. For example, the recent recognition that some odds-on models of dark matter generate signals in this range, caused by primordial black hole mergers or dynamics of over densities of ultra-light dark matter. The use of cavities in strong magnetic fields has been identified as one of the most promising techniques to search for HFGWs. So far cavities of small volumes and tuned to search for axions have been studied. In this context, we are currently establishing the GravNet (Global Network of Cavities to Search for Gravitational Waves) project, that aims to significantly improve these ideas towards the detection of HFGWs. The scheme utilizes the synergy of different technologies and methodology approaches and is fundamentally based on synchronous measurements of cavity signals from multiple devices operating in magnetic fields at different locations, boosting the sensitivity towards HFGWs by more than three orders of magnitude compared to current approaches. GravNet will therefore open a new vast parameter space of exploration for gravitational waves, and will constitute a milestone in the race for the first discovery of a high frequency gravitational waves, with potential to revolutionize our understanding of the Universe. In this talk, we will present the key concepts of GravNet, results of preliminary studies and possibilities to join this initiative.

05.06.2025

Zeit: 13:00

impulse #1 Gender (still) matters. How to navigate your academic career

Zeit: 14:30

online

Antrittsvorlesung: Prof. Valentina Forini (HU Berlin)

Zeit: 15:00

Talk: On Fields and Strings, and exploring their duality

Antrittsvorlesung: Prof. Valentina Forini (HU Berlin)

Zeit: 15:00

Zoom & Lise-Meitner-Haus, Christian-Gerthsen-Hörsaal, Newtonstraße 15, 12489 Berlin

Vortrag: On Fields and Strings, and exploring their duality

22.05.2025

Zeit: 13:00

Perspektive der Physik: Teilchen, Felder, Universum

Zeit: 15:00

Zoom & Lise-Meitner-Haus, Christian-Gerthsen-Hörsaal, Newtonstraße 15, 12489 Berlin

Info Veranstaltung für Studierende

15.05.2025

Zeit: 13:00

Erwin Schrödinger-Zentrum, Rudower Chaussee 26, 12489 Berlin, Vortragsraum 0'101

Perspektive der Physik: Licht-Materie-Wechselwirkung

Zeit: 15:00

Zoom & Lise-Meitner-Haus, Christian-Gerthsen-Hörsaal, Newtonstraße 15, 12489 Berlin

Info Veranstaltung für Studierende

24.04.2025 - Dr. Judith Katzy (DESY Hamburg): Measuring top associated Higgs production with the ATLAS detector at LHC

Zeit: 13:00

Erwin Schrödinger-Zentrum, Rudower Chaussee 26, 12489 Berlin, Vortragsraum 0'101

I will present a recent measurement of top associated Higgs production (ttH) in the Higgs to bb decay channel. Measurement results are presented as inclusive cross section as well as differentially as a function of Higgs transverse momentum. Several important improvements have been made to the standard analysis techniques which lead to results which are currently the most precise in a single Higgs decay channel.