451 zoekresultaten voor “theory” in de Publieke website
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Computational aspects of class group actions and applications to post-quantum cryptography
Most of current public-key cryptography is considered insecure against attacks from sufficiently powerful quantum computers. Post-quantum cryptography studies methods to secure information resistant against such attacks. One proposal is isogeny-based cryptography, which bases its security on computational…
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Links between cohomology and arithmetic
Promotor: S.J. Edixhoven
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Exposed to events that never happen: Genaralized unsafety and prolonged psysiological stress responses
The aims of the project are to: further clarify 'inhibition by safety'; explore and describe all possible sagety factors, with a special focus on the primary human safety source: social connectedness; reviewing prolonged stress responses without stressors.
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Coherent dynamics in solar energy transduction
Promotor: Prof.dr. H.J.M. de Groot, Co-promotor: Francesco Buda
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ALGANT
Fundamental research in the ALgebra, Geometry And Number Theory
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Postmaterialism and Socioeconomic Status Impact in the Chilean Voting Behavior
This paper describes the development process of voting behavior in Chile; particularly the relationship between the class voting theory and the theory of cultural post-materialist vote is investigated. This research deals with Chile as a case study, a developing country with a relatively stable democracy…
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Basis reduction for layered lattices
Promotor: H.W. Lenstra
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Fermions and Bosons: Excitons in strongly correlated materials
Promotors: Prof.dr. J. Zaanen, Prof.dr.ir. H. Hilgenkamp
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Refined tautological relations on moduli spaces of curves
The key purpose of this project is to study tautological relations on the level of closed differential forms or even integral cochains (i.e. we don't take classes in cohomology).
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Torsion points on elliptic curves over number fields of small degree
Promotor: S.J. Edixhoven Co-promotor: L. van Geemen, P. Parent
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Approach to Markov Operators on Spaces of Measures by means of equicontinuity
The subject of this thesis, ‘Approach to Markov Operators on Spaces of Measures by Means of Equicontinuity’, combines an analytical and probabilistic approach to Markov operators.
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Groups and fields in arithmetic
Promotor: Prof.dr. H.W. Lenstra
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Withstanding the cold: energy feedback in simulations of galaxies that include a cold interstellar medium
Understanding how galaxies form, interact, and evolve comes largely from comparing theory predictions with observational data. Numerical simulations of galaxies provide the most accurate approach to testing the theory, as they follow the non-linear evolution of gas and dark matter in great detail and…
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Enhanced coinduction
Promotores: Prof.dr. F.S. de Boer, Prof.dr. J.J.M.M. Rutten (Radboud Universiteit Nijmegen)
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Automata-theoretic protocol programming
Promotor: F. Arbab
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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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Cognitive Bias in the Judgment of Business Valuations and Valuators
Op 1 april 2020 verdedigde Marc Broekema zijn proefschrift 'Cognitive Bias in the Judgment of Business Valuations and Valuators'. Het promotieonderzoek is begeleid door promotor prof. dr. J.I. van der Rest.
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Stochastic resetting and hierarchical synchronisation
Stochastic resetting is simple enough to be approached analytically, yet modifies stochastic processes in a non-trivial way.
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Real-time foresight: preparedness for dynamic innovation networks
Promotor: H.J. van den Herik, B.R. Katzy, Co-promotor: K. Sailer
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Counting problems for number rings
Promotor: H.W. Lenstra
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On the amount of sieving in factorization methods
Promotoren: R. Tijdeman, A.K. Lenstra, Co-promotor: H.J.J. te Riele
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Bad reduction of Hilbert modular varieties with parahoric level structure
Promotor: S.J. Edixhoven, A. Iovita
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Complex multiplication constructions of abelian extensions of quartic fields
In this thesis, we show that we can use Shimura’s CM theory to explicitly compute the Hilbert class field of any primitive quartic CM field.
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Research in Physics, theoretical (MSc)
Deze master specialisatie behandelt een breed scala aan wetenschappelijke onderwerpen, waaronder High Energy Physics and Particle Cosmology, Theoretical Physics of Life Processes en Condensed Matter Theory.
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Shtuka cohomology and special values of Goss L-functions
Assuming everywhere good reduction we generalize the class number formula of Taelman to Drinfeld modules over arbitrary coefficient rings.
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Chat met een student
Heb je een vraag over studeren aan de Universiteit Leiden, het studentenleven in Leiden en Den Haag, of ben je op zoek naar inside informatie over de opleiding? Kom direct in contact met een van onze studenten!
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Media Studies (MA)
De masteropleiding Media Studies van de Universiteit Leiden combineert theoriekennis met praktijkervaring om zo een ideale springplank te vormen voor een carrière in de literatuur, film, fotografie of journalistiek.
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Robots die zich inleven in de mens
Om intelligentere en liefst ook sociale robots en computersystemen te bouwen, moet er eerst meer kennis komen over de manier waarop mensen informatie interpreteren. Max van Duijn en Tessa Verhoef doen onderzoek op het snijvlak tussen sociale wetenschap en AI.
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Dual Complexes of Semistable Varieties
This thesis is comprised of three chapters covering the theme of studying semistable varieties by looking at their dual combinatorial objects.
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Political discourses and the securitization of democracy in post-1991 Ethiopia
This thesis attempts to interrogate post-1991-2015 political development in Ethiopia, focusing on the political discourses espoused by the government and opposition, using the discourse analysis method and securitization theory.
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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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X-ray spectroscopy of interstellar dust: from the laboratory to the Galaxy
In this thesis, we present new laboratory data of interstellar dust analogues.
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Minor Creative Strategies for a Society in Change
De minor Creative Strategies for a Society in Change (CSSC) legt een verbinding tussen het verkrijgen van inzicht in creatieve maakprocessen en het verkennen van maatschappelijke problematieken die kenmerkend zijn voor onze tijd.
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Noisy Patterns: Bridging the gap between stochastics and dynamics
In this thesis, we study travelling waves in stochastic reaction-diffusion equations. We extend techniques from the deterministic theory for travelling waves to apply to the stochastic version, which allows us to compute the stochastic wave speed and shape, and draw conclusions on the stability of the…
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On the Galois closure of commutative algebras
Promotores: H.W. Lenstra, B. Erez, Co-promotor: L. Taelman
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Mathematics (MSc)
Deze tweejarige opleiding heeft twee componenten. De eerste is een meer analysegerichte component, met onderwerpen als dynamische systemen, differentiaalvergelijkingen, kansrekening en stochastiek, percolatie of wiskunde in de life sciences. De andere betreft een meer algebra- of meetkundegerichte component,…
- Opleidingen
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Nurbolat Kenbayev
Wiskunde en Natuurwetenschappen
n.kenbayev@liacs.leidenuniv.nl | +31 71 527 2727
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Francesco Ragazzi
Faculteit der Sociale Wetenschappen
f.ragazzi@fsw.leidenuniv.nl | +31 71 527 2727
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Francesco Buda
Wiskunde en Natuurwetenschappen
f.buda@lic.leidenuniv.nl | +31 71 527 5723
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Ab initio molecular dynamics calculations on reactions of molecules with metal surfaces
Promotor: Prof.dr. G.J. Kroes
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Bestuurlijke Aandacht tijdens Politieke Turbulentie
Besluitvormers in de publieke sector opereren te midden van een overvloed aan informatie en onduidelijke politieke doelstellingen. Aandacht is de sine qua non van beleidsvorming: waar aandacht voor is kan geadresseerd worden in beleidsoplossingen; wat over het hoofd gezien wordt niet. Ondanks het belang…
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Waves and Patterns in Discrete Media: Bridging the Gaps
What happens to electrical waves that have to cross gaps in insulation material around nerves in the human body
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Dancing with the Stars
This thesis develops a method for direction dependent calibration of the ionosphere in radio interferometric data.
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Non-Abelian metamaterials: emergent computing and memory
In the traditional theory of linear elasticity, superposition dictates that the response of a material does not depend on the sequence of the applied mechanical actuations.
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On Products of Linear Error Correcting Codes
In this thesis we study products of linear error correcting codes.
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Onderwijs
De sectie Cognitieve Psychologie draagt bij aan de 3-jarige bacheloropleiding en verzorgt 2 masterspecialisaties.
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On shape and elasticity: bio-sheets, curved crystals, and odd droplets
Because thin systems can deform along the thickness with relative ease, the interplay between surface mechanics and geometry plays a fundamental role in sculpting their three-dimensional shape.
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On the geometry of demixing: A study of lipid phase separation on curved surfaces
Like a mixture of oil and water, lipid membranes separate into two liquid phases.
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Political Science (MSc)
In de politiek draait alles om het maken van keuzes. Oorlog of vrede, links of rechts, vrijheid of veiligheid, soevereiniteit of integraties, conflict of samenwerking—keuzes doen ertoe. Kiezen is ook een essentieel onderdeel van jouw opleiding. Kies je voor een master’s in de Politieke Wetenschap aan…