People by Discipline

Name	Discipline	Category	Phone	Office
Shaviv Nir	Astrophysics and Relativity	Faculty	02 6585 807	Kaplun 102
Matsumoto Tatsuya	Astrophysics and Relativity	Post-Docs
Faerman Yakov	Astrophysics and Relativity	Post-Docs
Nussbaum Tomer	Astrophysics and Relativity	Graduate Students
Leidershneider Elly	Astrophysics and Relativity	Graduate Students
Bach Yossi	Astrophysics and Relativity	Graduate Students
Sari Reem	Astrophysics and Relativity	Faculty	02 6585 806	Kaplun 111
Livne Eli	Astrophysics and Relativity	Faculty	02 6584 727	Popick 110
Glasner Ami	Astrophysics and Relativity	Faculty	02 6584 727	Popick 110
Chan Chi Ho (Edwin)	Astrophysics and Relativity	Post-Docs	02 6584 997	Kaplun 101

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Upcoming Events

Yesterday

Physics Colloquium : "How the Galactic disk reshapes itself"
- Start time: 12:00pm
- End date: Monday, November 30th
- End time: 01:30pm
- Lecturer: Hans-Walter Rix (Max Planck Institute for Astronomy in Heidelberg)Abstract:By the standards of massive galaxies, the Milky Way has lived a sheltered life, unbattered by mergers with other large galaxies.Most of its stars indeed live in a thin, dynamically fragile disk. But does that imply that not much dynamical evolution has happened?Far from it: with new data, we can now show unequivocally that the orbits in the Galactic disk have extensively rearranged themselves over the lifetime of the disk. I’ll show how we know that, what dynamical mechanisms are at play, and why this may explain the remarkable regularity of the disk galaxy population.
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Thursday, December 3rd

Yuval Ronen - CM candidate
- Start time: 12:00pm
- End date: Thursday, December 3rd
- End time: 01:30pm
- Title: Inducedsuperconductivity in a fractional quantum Hall edgeLecturer: Dr' Yuval Ronen – Harvard universityAbstract: Topologicalsuperconductivity, realized as anintrinsic material property or as an emerging property of a hybrid structure, representsa phase of matter where topological constraints and superconductivity coexist.The exchange-statistics (braiding) of its quasiparticles is not bosonic norfermionic but is rather non-Abelian. Due to their exchange-statistics as wellas non-locality these excitations offer a promising route towardsfault-tolerant quantum computation. The simplest non-Abelian anyon is the Majoranazero mode with an Ising order. However, since braiding of Ising anyons does notoffer a universal quantum gate set, theoretical studies have introduced Parafermionzero modes (PZM), an array of which supports universal topological quantum computation.The primary route to synthesize PZMs involves inducing superconductivity on afractional quantum Hall effect (FQHE) edge. In this talk, I will introduce high-qualitygraphene-based van der Waals devices with narrow superconducting electrode(NbN), in which superconductivity and robust FQHE coexist. We find crossedAndreev reflection (CAR) across the superconductor separating twocounterpropagating FQHE edges. Our observed CAR probability of the integeredges is insensitive to magnetic field, temperature, and filling, therebyproviding evidence for spin-orbit coupling inherited from NbN enabling thepairing of the otherwise spin-polarized edges. FQHE edges notably exhibit a CARprobability higher than that of integer edges once fully developed. This FQHE CARprobability remains nonzero down to our lowest accessible temperature,suggesting superconducting pairing of fractional charges. These results providea route to realize novel topological superconducting phases with universalbraiding statistics in FQHE–superconductor hybrid devices based on graphene andNbN.
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High Energy Astrophysic Seminar - Peter Jonker (SRON & Radboud University)
- Start time: 01:00pm
- End date: Thursday, December 3rd
- End time: 02:00pm
- Tidal disruption events: probes of supermassive black holesTidal disruption events (TDEs) are currently discovered in ever increasing numbers by optical transient surveys. Similarly, the eROSITA and planned Einstein Probe X-ray satellites are expected to discover many TDEs in X-rays. TDEs are one of the most direct and promising routes to study otherwise quiescent supermassive black holes (SMBHs) and the accretion processes. I will introduce TDEs and show how we expect to learn about the black hole mass and spin and how this will help us understand the formation and evolution of SMBHs. Among the questions we would like to answer using TDE studies are: Do intermediate-mass black holes exist?; What is the spin distribution of supermassive black holes?~~~~~~~~~~~~~~~~Join Zoom Meetinghttps://huji.zoom.us/j/89109523146?pwd=Q1Z0b2xpTHRiZ1hla2RSRDViRmNwdz09Meeting ID: 891 0952 3146Passcode: 485033
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High Energy Seminar: "Photon Ring Autocorrelations"
- Start time: 04:00pm
- End date: Thursday, December 3rd
- End time: 05:30pm
- Lecturer: Shahar Hadar Abstract:In the presence of a black hole, light sources connect to observers along multiple paths. As a result, observed brightness fluctuations must be correlated across different times and positions in black hole images. Photons that execute multiple orbits around the black hole appear near a critical curve in the observer sky, giving rise to the photon ring. In this paper, a novel observable is proposed: the two-point correlation function of intensity fluctuations on the photon ring. This correlation function is analytically computed for a Kerr black hole surrounded by stochastic equatorial emission, with source statistics motivated by simulations of a turbulent accretion flow. It is shown that this two-point function exhibits a universal, self-similar structure consisting of multiple peaks of identical shape: while the profile of each peak encodes statistical properties of fluctuations in the source, the locations and heights of the peaks are determined purely by the black hole parameters. Measuring these peaks would demonstrate the existence of the photon ring without resolving its thickness, and would provide estimates of black hole mass and spin. With regular monitoring over sufficiently long timescales, this measurement could be possible via interferometric imaging with modest improvements to the Event Horizon Telescope.
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