Pizza lunch talks

The API pizza lunch talks are informal, weekly meetings where people give a half hour overview of their work (or perhaps a totally different topic), in an informal atmosphere. Pizza meeting is not a colloquium, but is intended to inform and stimulate discussion about the topic.

More information (including tips for speakers, contact points and the latest API articles & circulars).

Past lunch talks

Digital Security

Folkert Huizinga — API -- UvA

If your password is 8 characters or less, you should change it NOW! If you're using the same password on several websites, you should change your passwords NOW! Digital security is the protection of your digital identity – the network or Internet equivalent of your physical identity.

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Thursday 15 December 2016, 12:00. Location: C4.174

Periodic signals from very (ultra) luminous X-ray sources

Paolo Esposito — API -- UvA

In the last few years, we have undertaken systematic searches for periodic signals from X-ray sources in the Swift, Chandra, and XMM-Newton archives. So far, the effort has yielded about one hundred new X-ray pulsators.

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Thursday 8 December 2016, 12:00. Location: C4.174

The impact of mass loss on the final structure and fate of massive stars

Mathieu Renzo — API -- UvA

The end point of massive star evolution is either a neutron star formed in a supernova explosion, or a black hole, which can form with, or possibly without, an associated electromagnetic transient. The core structure at the end of the evolution determines the fate of the star.

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Thursday 1 December 2016, 12:00. Location: C4.174

Neutron Star Mass-Radius Constraints using Evolutionary Optimization

Abigail Stevens — API -- UvA

The equation of state of cold supra-nuclear-density matter, such as in neutron stars, is an open question in astrophysics. A promising method for constraining the neutron star equation of state is modelling pulse profiles of thermonuclear X-ray burst oscillations from hotspots on accreting neutron stars.

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Thursday 24 November 2016, 12:00. Location: C4.174

A new semi-analytical model for black hole jets

Chiara Ceccobello — API -- UvA

Collimated outflows are one of the most common features observed in astrophysical sources, because they are associated with a variety of objects, including X-ray binaries, active galactic nuclei, young stellar objects, and gamma ray bursts. Emission from such jets extends over the whole electromagnetic spectrum and is a proxy of the nature and activity of the central engine.

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Thursday 17 November 2016, 12:00. Location: G3.10

Probing the Inner Disk and Corona in AGN with X-ray Spectroscopy

Laura Brenneman — Harvard University

Supermassive black holes (SMBHs) are the most powerful engines in the Universe, but much about their inner workings close to the event horizon remains unknown. I will review our present knowledge of the inner accretion disk/corona system in actively accreting SMBHs.

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Thursday 10 November 2016, 12:00. Location: H331 (Nikhef, third floor)

Making Close Double Neutron Stars and Black Holes by Spiral-in without Common-Envelope Evolution

Ed van den Heuvel — API -- UvA

When the donor star in a High-Mass X-ray Binary (HMXB) has a radiative envelope when it begins to overflow its Roche lobe, a Common-Envelope (CE) phase will in most cases be avoided. I will show that making close double black holes by regular binary evolution does not require wide initial binaries.

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Thursday 3 November 2016, 12:00. Location: G.005

Particle Acceleration in Mildy Relativistic Plasmas

Patrick Crumley — API/GRAPPA -- UvA

I will discuss the physics of particle acceleration in shocks in a regime largely ignored in the literature, the transition between relativistic and Newtonian shocks, presenting preliminary results of particle-in-cell simulations of mildly relativistic shocks that show non-thermal acceleration in both electrons and ions.

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Thursday 27 October 2016, 12:00. Location: C4.174

Direct probe of the inner accretion flow around the supermassive black hole in NGC 2617

Margherita Giustini — SRON

Active Galactic Nuclei (AGN) are powered by mass accretion onto supermassive black holes (SMBHs) residing at the center of galaxies, and are thought to be the main manifestation of the co-evolving phase between SMBHs growth and host galaxy formation.

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Thursday 20 October 2016, 12:00. Location: C4.174

AGN jets and neutrinos

Felicia Krauss — API/GRAPPA -- UvA

Active galaxies harbor a supermassive black hole at their center. They often show perpendicular outflows of matter, called jets, which might contribute to the observed cosmic rays and neutrinos.

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Thursday 13 October 2016, 12:00. Location: C4.174