Central European Institute for Cosmology and Fundamental Physics

Upcoming seminars

Cosmo: Wednesday, 01/02/2023, 11:00, Main lecture hall
Stefano Savastano (Potsdam Max Planck Institute, Germany)
Observing Continuous Gravitational Waves lensed by Sgr A*
With the rising of Gravitational Wave astronomy, observing lensed Gravitational Waves (GWs) signals in the future is a concrete possibility. The gravitational lensing of GWs provides a rich phenomenology to devise new probes of the matter distribution in the Universe. I will discuss how Continuous Gravitational Waves emitted by isolated neutron stars can be lensed by the super-massive black hole at the center of our galaxy, Sgr A*, and potentially observed by next-generation gravitational wave detectors. In particular, I will show that, with the motion of the lens taken into account, future detectors can accurately distinguish and measure parameters of lensed continuous waves from sources located behind Sgr A* within a broader area than previously considered, increasing the probability of observing such events.

Strings: Thursday, 02/02/2023
René Meyer (University of Wurzburg, Germany)

Cosmo: Wednesday, 08/02/2023, 11:00, Main lecture hall
Armando di Matteo (INFN Torino, Italy)
Ultra-high-energy cosmic rays: what we know and what we don't, and possible "new physics" implications
Over 60 years after their discovery, the sources of ultra-high-energy cosmic rays (UHECRs), atomic nuclei from outer space with energies over 1 EeV, are still unknown. Deflections by intergalactic and Galactic magnetic fields prevent us from straightforwardly inferring the position of their sources from their arrival directions as can be done with neutral messengers, and interactions with extragalactic background photons alter their energy spectrum and mass composition making it nontrivial to infer properties of their sources from terrestrial observations. Nevertheless, the large numbers of events detected by the last-generation UHECR detectors have allowed us to answer a few of the longstanding questions about these particles, though many others remain. Furthermore, their extreme energies allow us to probe certain hypotheses about physics beyond the Standard Model in regimes not accessible via artificial particle accelerators. In this seminar, I will provide an overview of the field, with a special emphasis on relatively recent developments and on frequently misunderstood issues, and an outlook for the near- and medium-term future.

Strings: Monday, 13/02/2023
Athanasios Chatzistavrakidis (Rudjer Boskovic Institute, Croatia)

Cosmo: Wednesday, 15/02/2023
Vitor Cardoso (IST Lisbon, Portugal)

Strings: Monday, 20/02/2023
Thomas Mertens (UGhent, Belgium)

Cosmo: Wednesday, 22/02/2023
Daniela Doneva (University of Tübingen, Germany)

Strings: Monday, 27/02/2023
Karapet Mkrtchyan (Imperial College, UK)

Cosmo: Wednesday, 15/03/2023
Sante Carloni (Università di Genova, Italy)

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