160 zoekresultaten voor “black holes” in de Publieke website
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Applied String Theory: Explaining Quantum Matter with Black Holes
Hoe kunnen we de mysteries van quantummaterie verklaren?
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Hydrodynamics and the quantum butterfly effect in Black Holes and large N quantum field theories
Why do black holes emit thermal radiation? And how does a closed quantum system thermalize?
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Facets of radio-loud AGN evolution: a LOFAR surveys perspective
Promotor: H.J.A. Rottgering, Co-Promotor: R.J. van Weeren
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Lindsay BlackFaculteit der Geesteswetenschappen
l.black@hum.leidenuniv.nl | +31 71 527 2218
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Caitlin BlackWiskunde en Natuurwetenschappen
c.e.black@cml.leidenuniv.nl | +31 71 527 2727
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Clues from stellar catastrophes
Promotores: S.F. Portegies Zwart, E. M. Rossi
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Monsters in the Deep: Using simulations to understand the excess baryonic mass in the centres of high-mass, early-type galaxies
This thesis aims to enhance our understanding of galaxies by testing theoretical models of galaxy formation against observations, particularly in the cases of extreme systems which have been found to have an excess of baryonic mass in their central regions, in the form of either supermassive black holes…
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Matching, entropy, holes and expansions
In this dissertation, matching, entropy, holes and expansions come together. The first chapter is an introduction to ergodic theory and dynamical systems.
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Far from home: the science exploitation of the fastest Milky Way stars
The Sun and all the stars in the night sky reside in the Milky Way galaxy. In the at-rest reference frame of the Galaxy, typical stars travel with velocities of about 100-200 kilometres per second.
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The dust and molecular gas in the torus of NGC 1068
An Active Galactic Nucleus (AGN) is a highly luminous region at the center of a galaxy, powered by the accretion into a supermassive black hole and emitting energy from radio waves to gamma rays, often outshining the host galaxy.
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The Great Collapse
Promotor: Prof.dr. S.F. Portegies Zwart
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Unveiling the nature of giant radio galaxies
The thesis deals with the study of giant radio galaxies (GRGs), which are radio galaxies of megaparsec sizes.
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Karwan Fatah-BlackFaculteit der Geesteswetenschappen
k.j.fatah@hum.leidenuniv.nl | +31 71 527 2666
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Faint Quasars at Very Low Frequencies
In this thesis, we use low-frequency and high-frequency radio observations to address the following questions regarding quasars: is the radio loud/quiet quasar dichotomy real?
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Dynamics and radiation from tidal disruption events
When a star gets too close to a supermassive black hole, it is torn apart by strong tidal forces in a tidal disruption event (TDE).
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Radio galaxies near the epoch of reionisation
This thesis explores the theoretical and observational properties of distant massive galaxies that harbour active black holes in their centres and shine brightly at radio wavelengths.
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A well-established harmony in chaos: from isolated galaxies to galaxy clusters
The origin and evolution of galaxies are closely linked to many different physical phenomena.
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The colours of the extreme universe
This thesis presents pioneering work on the panchromatic emission of some of the most luminous galaxies in the early Universe: star forming galaxies and active galactic nuclei.
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Neutral outflows in high-redshift dusty galaxies
Outflows are crucially important for the gas budget and evolution of luminous star-forming galaxies and AGNs, with observed mass outflow rates of the same order as the star formation rate. Greater star formation and black hole growth lead to more intense feedback and outflows, resulting in self-regulated…
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Extremely loud & incredibly far: observing radio bright AGN into the cosmic dawn
In this thesis new methodologies are developed for the detection and systematic study of radio sources in the early universe. This allows us to gain a deeper understanding of the formation and evolution of galaxies, the activity of supermassive black holes, and the final phase transition of our universe:…
- Kaiser Lente Lezing: Zooming in on Black Holes
- Oortlezing
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Podcast: Karwan Fatah-Black over de transatlantische slavenhandel
Twee podcastafleveringen van Africast over de Transatlantische Slavenhandel met Karwan Fatah-Black.
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Translational Symmetry Breaking in Holographic Strange Metals
In this thesis, we have used numerical approaches to study the effects of translational symmetry breaking on strange metallic systems as realised by the holographic duality.
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Huib Jan van Langevelde nieuwe directeur Event Horizon Telescope
De Leidse astronoom Huib Jan van Langevelde is benoemd tot directeur van het Event Horizon Telescope (EHT)- consortium. De EHT is een project waarbinnen zo’n 350 wetenschappers uit 18 landen samenwerken. De EHT bundelt de grote ALMA-telescoop in Chili met andere (sub)millimetertelescopen en publiceerde…
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Zwarte gaten met ‘dreadlocks’ bieden inzicht in quantummaterie
Natuurkundigen begrijpen nog weinig van quantummaterie, dat bijvoorbeeld ten grondslag ligt aan toekomstige quantumcomputers. Theoretici hebben nu ontdekt dat zwarte gaten met ‘dreadlocks’ op eenzelfde manier zijn opgebouwd, wat het rekenwerk aan quantummaterie vergemakkelijkt. Publicatie in Physical…
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Stochastic and Deterministic Algorithms for Continuous Black-Box Optimization
Continuous optimization is never easy: the exact solution is always a luxury demand and the theory of it is not always analytical and elegant.
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Strings and AdS/CFT at finite density
Promotores: J. Zaanen, A. Parnachev
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The structure of the dusty cores of active galactic nuclei
Promotor: W. Jaffe, Co-promotor: K. Meisenheimer
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Giant galactic outflows and shocks in the Cosmic Web
The radio sky harbours both galactic and extragalactic sources of arcminute- to degree-scale emission of various physical origins. To discover extragalactic diffuse emission in the Cosmic Web beyond galaxy clusters, one must image low–surface brightness structures amidst a sea of brighter compact fore-…
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Multiple star formation: chemistry, physics and coevality
Multiple stars, that is two or more stars composing a gravitationally bound system, are common in the universe.
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Dynamics of coupled quantum systems
Thermodynamics is one of the founding scientific pillars that has helped us better understand heat engines, biology, ecosystems, and even black holes. While it fundamentally describes large systems by examining the bulk behavior of their constituents, it is anchored in the statistical equivalence of…
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Hunting for the fastest stars in the Milky Way
The high velocity tail of the total velocity distribution of stars provides essential insight into fundamental properties of the Galaxy.
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Tuning in to the feedback bassline: revealing the operation of AGNs in galaxy clusters with high-resolution radio observations
Following the Big Bang, structure in the Universe started collapsing under the force of gravity. This resulted in the formation of the first stars, galaxies and clusters of galaxies.
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Surrogate-Assisted Optimization Techniques for Expensive Constrained Black Box ProblemsBagheri, S.
Optimization tasks in practice have multifaceted challenges as they are often black box, subject to multiple equality and inequality constraints and expensive to evaluate.
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Hierarchical Systems
The thesis addresses the long-term dynamical evolution of hierarchical multiple systems.
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Model-assisted robust optimization for continuous black-box problems
Uncertainty and noise are frequently-encountered obstacles in real-world applications of numerical optimization. The practice of optimization that deals with uncertainties and noise is commonly referred to as robust optimization.
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4,9 miljoen euro om de mysteries van zwarte gaten te ontrafelen
Het Nederlands Zwarte Gaten Consortium ontvangt 4,9 miljoen euro van NWO voor het ontrafelen van de raadselen van zwarte gaten en andere mysteries van het heelal. De The Astronomy & Society groep van de Leidse Sterrewacht is aangesloten om het vooraanstaande onderzoek in te zetten om mensen van alle…
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Twee Marie Curie-beurzen voor Leidse theoretisch natuurkundigen
Theoretisch natuurkundigen Kevin Grosvenor en Sam Young hebben Marie Curie-beurzen toegekend gekregen voor onderzoek aan het Instituut Lorentz.
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Black Theatre springlevend in Zuid-Afrika
Black Theatre, activistisch theater van en voor zwarte Zuid-Afrikanen, bloeide op onder de apartheid. Maar met de democratisering van Zuid-Afrika heeft deze kunstvorm allerminst aan belang ingeboet, meent Francis Rangoajane. Promotie op 16 november.
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Veni voor dr. Karwan Fatah-Black
Dr. Karwan Fatah-Black heeft een Veni binnengehaald voor zijn onderzoek 'Paths through slavery: urban slave agency and empowerment in Suriname, 1700-1863'.
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Karwan Fatah-Black over koloniale zeehelden en straatnamen
Te midden van de ophef rondom het Nederlandse koloniale verleden, klonken er stemmen vanuit de gemeente Urk straten in een nieuwbouwwijk te vernoemen naar zeehelden van vroeger.
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Black lives matter: waarom het Amerikaanse protest in Nederland resoneert
De directe aanleiding was de dood van George Floyd door politiegeweld, maar de Black Lives Matter-betogingen in de Verenigde Staten en hier in Nederland gaan over veel meer dan dat. We vroegen Karwan Fatah-Black, historicus op het gebied van de Nederlandse slavernijgeschiedenis, naar zijn analyse. ‘We…
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The spin evolution of accreting and radio pulsars in binary systems
Pulsars were first discovered in 1967 and since then the population has grown and expanded over several wavelengths.
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Karwan Fatah-Black bij NPO Radio 1 en het Parool over ons slavernijverleden
Karwan Fatah-Black, universitair docent en specialist in Nederlandse koloniale geschiedenis, was te gast bij NPO Radio 1 en gaf een interview in het Parool. Hij sprak over zijn nieuwe boek, Eigendomsstrijd, waarmee hij een nieuw licht op ons slavernijverleden in Suriname hoopt te werpen.
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Leidse wetenschappers en studenten in de media over overlijden Stephen Hawking
Op 14 maart stierf theoretisch natuurkundige Stephen Hawking in zijn woonplaats Cambridge. In kranten en op radio en tv blikken Leidse wetenschappers - van wie sommige nog met Hawking werkten - en studenten terug op leven en wetenschappelijke loopbaan van 'de Einstein van deze tijd'.
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Black lives matter: ‘Racisme bestaat in allerlei vormen, maar is een wereldwijd probleem'
Het begon met betogingen vanwege de dood van George Floyd door politiegeweld in Minneapolis, maar de Black Lives Matter-protesten verspreiden zich snel over heel Amerika. Dagelijks gaan door heel het land duizenden mensen de straat op. We vroegen Amerika-deskundige Sara Polak hoe dat komt. ‘Na Ferguson…
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Surface plasmon lasers
Surface plasmons (SPs) are surface waves at the interface between a dielectric and a good metal, and are formed by the interaction between light and the free electrons at the metal-dielectric interface. They provide strong field confinement for optical fields, opening new possibilities for enhanced…
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Scattering and absorption in 2D optics
Scattering of light in the presence of nano-structured materials, i.e. with features in the order of the wavelength of the light or smaller, reveals details of how light interacts with matter at the nanoscale.
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