Alexander Balatsky's field of research is theoretical condensed matter physics. His recent work has mainly been in strongly correlated materials, unconventional superconductivity, and biomolecular electronics.
Iouri Belokopytov received his PhD at Institute of High Energy Physics, Serpukhov, Russia, in 1979. In the early 1980s he joined the DELPHI experiment on the Large Electron and Positron collider at CERN (Geneva, Switzerland), where he was working as Delphi Database Software group member, then the Database group leader. In 1997 he moved to Stockholm University, and then to Nordita. His primary interest is computing science.
Iouri speaks English and Russian.
Professor Axel Brandenburg received his PhD at the University of Helsinki in 1990. After two postdocs at Nordita in Copenhagen and at the High Altitude Observatory at the National Center for Atmospheric Research in Boulder/Colorado he returned to Nordita as Assistant Professor for just over a year before he went in 1996 as full Professor of Applied Mathematics to the University of Newcastle upon Tyne. In 2000 he moved once again to Nordita, this time as full professor. He became professor at the Department of Astronomy in Stockholm when Nordita moved from Denmark to Sweden in 2007
Axel Brandenburg is working in the field of astrophysical fluid dynamics and has also an interest in selected topics of astrobiology. He is particularly interested in the question of magnetic field generation from turbulent motions with applications to the Sun and stars, accretion discs, galaxies, and the early Universe.
His work on accretion disc turbulence was the first to show that the magneto-rotational and dynamo instabilities lead to a sustained doubly-positive feedback. Recently, he contributed to clarifying the long-standing question of the suppression of the dynamo effect in generating large-scale fields. He is also responsible for the maintenance of the Pencil Code, which is a public domain code (
pencil-code.googlecode.com) for astrophysical fluid dynamics that is well suited for large clusters with distributed memory.
In 2009 he received funding from the European Research Council for a project on Astrophysical Dynamos with a volume of 2.22 M € to support 4 PhD students, 4 post-docs, one assistant professor and several senior visitors.
Xinyi Chen graduated from the University of Barcelona and did her master in high-energy physics at ETH (Zurich) and École Polytechnique (Paris), where she also worked on properties of arbitrary dimension conformal field theories for her master thesis.
Xinyi joined Nordita in September 2013 to pursue her PhD studies under the supervision of Konstantin Zarembo, Nordita, and Joseph Minahan, Uppsala University. She will investigate the integrability of quantum field theories as well as the holographic principle.
Paolo Di Vecchia received his degree (Italian Laurea) at the University of Rome in 1966. After a post-doctoral fellowship at the Laboratori Nazionali di Frascati he was offered a permanent position there. After two-year positions at MIT and CERN he became Assistant Professor at Nordita, 1974-1978. After another year at CERN he became Professor first at the Freie Universität in Berlin in 1979 and then at the University of Wuppertal, 1980 to 1986. He came to Nordita in February 1986.
Paolo has worked and continues to work on the theory of elementary particles by using perturbative and non-perturbative methods both in field and string theories. His recent work has dealt with the extension of the AdS/CFT correspondence to less supersymmetric and non-conformal gauge theories deriving many properties of these theories, as the beta-function and the gaugino condensate of N=1 super Yang-Mills, from the supergravity solution. Another activity has been the construction of the four-dimensional low-energy Lagrangian from toroidal compactifications in magnetized D branes models that have the important property of generating chiral matter necessary for describing quarks and leptons. In this framework, he has computed the moduli dependence of the Kaehler metrics and of the Yukawa couplings using both stringy instantons and field theoretical methods. Most recently, he has studied high-energy scattering of closed strings on a stack of D branes in various regimes of impact parameter and 't Hooft coupling.
Since 1994, he has coordinated the organization of Nordic meetings in string theory bringing together Nordic researchers and students twice a year to learn about recent developments in the field. He has organized summer schools in field and string theory for Nordic students and supervised Nordic students. He was elected in 2003 member of the Det Kongelige Norske Videnskabers Selskab.
Ralf Eichhorn received his PhD from the University of Augsburg in 2000. After postdoctorial work in Augsburg and Bielefeld, he joined Nordita in January 2009. His general research interest is on the statistical mechanics of complex systems with application to biophysical problems.
Ralf's current research activities are centered around the theory of transport processes in non-equilibrium systems, where thermal noise typically plays a dominant role. Apart from studying idealized stochastic models, Ralf is also interested in developing concrete realizations of such transport phenomena, aiming at biophysical applications in microfluidic devices (lab-on-a-chip) for the separation, purification or mixing of colloidal particles and complex biomolecules like DNA or proteins. This is motivated by the vision of a lab-on-a-chip, which combines all preparational and analytical steps of a diagnostic device in a single microfluidic system. A further direction in Ralf's research covers the dynamic aspects of molecular recognition. Molecular recognition of two biomolecules occurs due to (non-specific) interactions between complementary regions on their surfaces. Within the framework of coarse-grained models for the molecules, the dynamic aspects of the recognition process in the crowded environment of a cell are studied. More recently, Ralf became interested in stochastic thermodynamics, a new field in non-equilibrium statistical mechanics addressing the problem of generalizing and extending concepts from equilibrium statistical physics to the non-equilibrium realm.
Ralf has intense collaborations with scientists at KTH and has established contacts to several groups in the Nordic countries (e.g., Aarhus, Lund, Gothenburg). He organized two "Nordic Workshops on Statistical Physics" (March 2010 and Feb 2011), is co-organizer of a workshop on DNA self-assembly (May 2011) and of two four-week scientific programs at Nordita (fall 2011 and spring 2012). Moreover, Ralf co-organizes an international seminar series on "Complex systems and biological physics".
Matthias Geilhufe got his Ph.D from Martin Luther University Halle-Wittenberg (Germany) in December 2015. As a PhD student he was employed at the Max Planck Institute of Microstructure Physics in Halle (Saale).
Matthias' research is based on the development and application of methods for the theoretical investigation of materials. In the focus are approaches based on density functional theory or group theory. He is mainly interested in magnetic properties of materials and in describing materials with a Dirac-like dispersion relation for the quasiparticles near the Fermi surface.
In the future Matthias will apply modern approaches, e.g. based on data mining or machine learning to characterize and predict Dirac materials.
Monica Guică obtained her PhD from Harvard in 2008, followed by a postdoc in Paris LPTHE and CEA Saclay, and one at UPenn.
Monica's research is centered around understanding gravity at a fundamental level. Important clues from black hole physics show that gravity is holographic, i.e. that a gravitational theory on a given space-time can be described by a field theory in lower dimensions. Her interests are focused on finding the microscopic description of black holes - especially realistic ones - using holography, on understanding the holographic dictionaries in instances that go beyond the well-studied AdS/CFT correspondence, and on understanding the emergence of space-time and gravity from the dual field theory perspective, using entanglement. While holography and the mechanism of emergence of space-time are believed to be universal, string theory, as the only consistent theory of quantum gravity known to date, provides an invaluable concrete framework for studying these questions.
John Hertz received his PhD from the University of Pennsylvania in 1970. After a postdoc at the Cavendish Laboratory, University of Cambridge, he joined the faculty of the James Franck Institute, University of Chicago as an Assistant Professor. He became Professor at Nordita in Copenhagen in 1980. Since 2007 he has also been Professor at the Niels Bohr Institute and, since 2014, visiting Professor in the Department of Neuroscience, Faculty of Health Sciences at Copenhagen University. He divides his time between Copenhagen and Stockholm.
In the beginning of his career, John worked in condensed matter theory, particularly on magnetism in systems with highly correlated electrons and on phase transitions, which led to his well-known work on quantum critical phenomena. He then turned to the statistical mechanics of disordered systems, particularly spin glasses. This, in turn, led him to develop an interest in neural networks. With Anders Krogh and Richard Palmer, he wrote what is still the standard book on artificial networks. In recent years he focused on biological networks, particularly on modeling the dynamics of neural networks in the neocortex and the problem of inferring connectivity (and other network features) from recorded neuronal spike trains. His current work deals with stochastic properties of protein and gene networks in cells.
His collaborative activity in the Nordic region includes organizing two Nordic networks on neural computation, teaching and collaboration with groups in Norway and Sweden, numerous summer schools and conferences, and supervision of MS and PhD students.
Marie Hjeltman has a Masters degree in Journalism from Uppsala University and a degree in Social Science from University of Amsterdam. At Nordita Marie is among others responsible for the work environment and equal treatment management and archiving. She also assists with the administration of programs and conferences.
Marie speaks Swedish, English, Dutch and Spanish.
Sabine Hossenfelder received her PhD from the University of Frankfurt, Germany, in 2003. She worked as a postdoc at the University of Arizona, Tucson, and later at the University of California, Santa Barbara, and the Perimeter Institute in Waterloo, Canada. Sabine joined Nordita in September 2009.
Sabine's main research interest is physics beyond the standard model, with a special emphasis on the phenomenology of quantum gravity. This still young research field brings together experimentalists and theorists and connects many different areas, from cosmology and astrophysics over neutrino physics to particle colliders and high precision measurements. Her contributions are focused on the role of Lorentz-invariance and locality, which might be altered in the fundamental to-be-found theory of quantum gravity and be accessible to experiment.
Sabine has collaborators at Perimeter Institute in Canada, at the University of Sussex, at SISSA in Trieste, and the MPI in Potsdam, Germany. At Nordita, she has organized a workshop on "Experimental Search for Quantum Gravity" in summer 2010 that was well attended by Nordic and international participants.
Henrik Johansson received his PhD in 2009 from UCLA. He then held a postdoc position at CEA Saclay until 2012, and one at CERN until 2014, when he took up a Senior Lecturer position jointly at Nordita and Uppsala University.
Henrik's field of research is high-energy physics with special emphasis on quantum corrections to scattering processes in gravity and gauge theories, including analysis of the ultraviolet behavior of supergravity. Recently he has been focusing on novel formalisms that rewrite standard gravity theories as double copies of gauge theories.
Henrik was awarded as a 2013 Wallenberg Academy Fellow, which through the Knut and Alice Wallenberg Foundation funds a five-year research project on "Color-Kinematics Duality and Ultraviolet Divergences".
Maarit Käpylä is currently working with astroinformatics at Aalto University, and is also group leader at the Max Planck Institute for Solar System Research as leader of an independent Max Planck research group called "SOLSTART".
Alexander Krikun eceived his PhD in theoretical physics in 2011 in the Institute for Theoretical and Experimental Physics (ITEP), Moscow, Russia. He was a Nordita Fellow in 2013-2015 and then a PostDoc in Leiden University in 2015-2019. Now he rejoined Nordita as an Assistant Professor, supported by the VR Starting Grant, call 2018.
Alexander's main subject of interest is the development of Holographic Phenomenology for Quantum Matter, based on the concept of AdS/CFT duality, originating from String Theory. This theoretical tool allows one to address the behavior of strongly entangled quantum systems by means of a General Relativity model in auxiliary curved spacetime. The resulting unusual phenomenology can be directly compared to the data obtained in Condensed Matter Experiments.
Olga Lekka is administrative assistant at Nordita since 2018, and is responsible for external visitors.
Michael (Mikhail - Misha) Liberman received his Ph.D. degree from the P. Lebedev Institute of General Physics in 1971 for (Symmetry groups in quantum theory) and his Dr. Sc. in theoretical physics from the A. Budker Institute of Nuclear Physics in 1981. In 1970 he joined the theoretical department at the P. Kapitza Institute for Physical Problems, Moscow. His many years association with Ya. B. Zeldovich during his life in Moscow was of particular importance. In has become a professor at the University of Uppsala. Misha Liberman made fundamental contributions to diverse fields of physic, including physics of shock wave (Physics of Shock Waves in Gases and Plasmas, Springer-Verlag, 1985 (with A. Velikovich), plasma physics (Physics of High-Density Z-pinch Plasmas, Springer-Verlag, 1998 (with J.DeGroot, A.Toor, R.Spielman), combustion theory including thermonuclear supernovae combustion, and Bose-Einstein condensate of excitons. He is best known as one of the world's leading scientists in combustion theory. Liberman's major contributions in combustion theory include a comprehensive theory of dynamics and stability of laminar flame and fractal structure of spherically expanding flames; interaction of flames with acoustic and shock waves, a nonlinear equation for a nonperturbative description of curved premixed flame. He is a fellow of American Physical Society: "For outstanding contributions ranging from laboratory plasma experiments to astrophysical phenomena, particularly in the areas of shock waves, Z-pinches, flame stability, and laser produced plasmas" and a honorary professor at the Moscow Institute of Physics and Technology.
In the last years his main current research interests are the origin and mechanisms of dust explosions and deflagration-to-detonation transition, clustering of particles in a turbulent flow, coherent 2D electron-hole systems and Bose-Einstein condensation of 2D excitons.
Lars Mattsson received his PhD in 2009 from Uppsala University, under the supervision of Susanne Höfner, and later (in 2010) he joined the Dark Cosmology Centre at the Niels Bohr Institute, where he stayed for three years working in close collaboration with Anja C. Andersen.
His main scientific interest is cosmic dust and his previous research has largely been about simulating dust formation together with dust-driven winds from carbon stars, and various aspects of the build-up of dust and related key-elements in galaxies. He joined the astrophysics group at Nordita in November 2013 as a postdoctoral fellow (Nordita fellow) and will work on physical modelling of cosmic-dust processing.
Anastasios Mentesidis received his Masters degree in Civil Engineering from KTH – Royal Institute of Technology in 2015 and has been working at Nordita since then as a conference and workshop coordinator.
Anastasios speaks English and Greek.
Dhrubaditya Mitra received his PhD from Indian Institute of Science, Bangalore India in the year 2005. He spent two years in Observatoire de Nice and three more years in Queen Mary College, University of London as postdoc. He started as an assistant professor at Nordita in 2010.
His principal field of research is astrophysics with particular interest in astrophysical dynamos, but his research interests are widespread. He is interested in the general field of non-equilibrium statistical mechanics and turbulence including magneto-hydrodynamic turbulence and complex fluids.
In Nordita he works in the group of Axel Brandenburg. He also collaborates with groups in Linné Flow Center in KTH. Outside sweden, he has collaborations with Observatoire de Nice and Indian Institute of Science, Bangalore.
Hans von Zur-Mühlen received his Masters degree in Physics from Stockholm University in 1985 and was employed as a teacher at the Physics Department until 2008. Between 2001 and 2008 he also worked in the AlbaNova administration. He has been with Nordita since 2007, working mainly as technical support and webmaster but earlier also with event management.
Hans speaks Swedish, English and German.
Christopher Pethick was brought up in England, and was educated at the University of Oxford, where he received his B.A. degree in 1962, and his D.Phil. degree in 1965 for work on liquid helium 4 under the supervision of Dirk ter Haar. In 1965 he became a Fellow by Examination (research fellow) at Magdalen College, Oxford. In 1966, he became a postdoctoral fellow at the University of Illinois, and after spending the academic year 1969-1970 in Oxford and at Nordita, he joined the faculty at Illinois as an associate professor, becoming full professor there in 1973. Also in 1973 he became Professor of Physics at Nordita, while maintaining his strong connections with the University of Illinois. During the academic year 1973-1974 he was a visiting professor at the Landau Institute in Moscow and at Nordita, and for the calendar year 1995 he was a visiting professor at the Institute for Nuclear Theory in Seattle. He was director of Nordita from 1989-1994.
He was a founding Board member of ECT* (the European Centre for Theoretical Studies in Nuclear Physics and Related Areas in Trento) (1992-1997), a member of the National Advisory Committee of the Institute for Nuclear Theory and Seattle (1997-1999), an Associate Editor of Reviews of Modern Physics (1997-1999), and a member of the Editorial Board of Physical Review A (2004-2010).
He has contributed to diverse fields of physics, especially the properties of quantum liquids, both normal and superfluid, and the properties of dense matter and neutron stars. In 2008 he, together with Gordon Baym and Jason Ho, received the Lars Onsager Prize of the American Physical Society for his work on quantum liquids and in 2011 he received the Society's Hans Bethe Prize for work in nuclear physics and astrophysics. He is a foreign member of the The Royal Danish Academy of Sciences and Letters and of the Royal Norwegian Society of Sciences and Letters, a Foreign Honorary Fellow of the American Academy of Arts and Sciences, a member of the American Philosophical Society, and a Fellow of the American Physical Society.
His main current research interests are in ultracold atomic gases and in dense matter in collapsing stars and in neutron stars.
Juri Poutanen got his PhD from the University of Helsinki in 1994. After that he was a postdoc at Stockholm Observatory for two years, and assistant professor at Uppsala University and then at Stockholm University. In 2001, he moved to the full professor position at the University of Oulu in Northern Finland. He was elected member of the Finnish Society of Sciences and Letters in 2009. From 2014, he is professor at University of Turku and director of Tuorla observatory.
Juri Poutanen works on various aspects of high-energy astrophysics. His research interests include gamma-ray bursts and accreting compact objects such as black holes, neutron stars and white dwarfs. His main expertise is radiative processes in relativistic plasmas that shape the spectra and are responsible for the emission from these objects. His most influential papers concern detailed study of Compton scattering including polarization properties that are again in the focus of many proposed space X-ray polarimetry missions. Other important results concern super-Eddington accretion disks around black holes which are relevant for ultra-luminous X-ray sources, emission mechanisms of relativistic jets in active galaxies and gamma-ray bursts, understanding broad-band emission of accreting black holes, and determination of neutron star parameters from the pulse profiles of accreting millisecond pulsars. Recently he concentrated on studying accretion onto strongly magnetized neutron stars and understanding the nature of ultra-luminous X-ray pulsars. He is also actively involved in development of atmosphere models for hot neutron stars and their usage to determine neutron star parameters in order to constrain the equation of state of cold dense matter.
Yasser Roudi obtained his PhD in 2005 from SISSA. He then moved to the Gatsby Unit at University College London as a Senior Research Fellow, where he stayed until 2008. During this period he also spent time at Dept. of Physiology and Biophysics of Cornell University working as a visiting scientist after winning a Bogue Research Fellowship. He then moved to Nordita for his second postdoc in 2008. After this he moved to the Kavli Institute for Systems Neuroscience at the Norwegian University of Science and Technology (NTNU) in Trondheim, Norway while also being a Corresponding Fellow at Nordita.
Yasser's research interest lies at the interface of statistical physics and biology. His recent work involves the use of spin glass physics to build statistical inference methods and infer network connectivity from high-throughput data. In recent years these methods have proven very useful in analyzing data from multi-electrode neural recordings and micro-array gene expression data.
Alexandra Veledina got her PhD from the University of Oulu, Finland, in 2014. She made a short postdoc at the University of Turku before moving to Stockholm as Nordita fellow in 2016. Since September 2017, she is Nordic assistant professor on a joint appointment with the University of Turku, Finland.
Her research is in the field of radiative processes in nearly-Maxwellian relativistic plasmas. In particular, her works are concentrated on modeling spectral and temporal characteristics of accreting compact objects such as black holes and neutron stars. She developed an accretion flow model capable of explaining many enigmatic multiwavelength observations obtained recently: correlated fast optical and X-ray variability, quasi-periodic oscillations and strong non-thermal infrared/optical flares. Her works raised attention to the importance of combining spectral and timing techniques.
Alexandra continues to work with astrophysical accretion flows, now paying more attention to the flow microphysics, rather than the observed characteristics. She plans to develop an MHD code capable of describing dynamics of accretion flow with non-Maxwellian electrons, relevant to black hole accretion environment.
Dmytro Volin received his PhD from the Université Paris-Sud XI in September 2009. His thesis was conducted and supervised at the Institut de Physique Théorique, Saclay. From October 2009 till October 2011 he had a postdoctoral position at the Pennsylvania State Univeristy, then he moved to Sweden to join Nordita for his second postdoc.
Dmytro's main interests are strongly interacting field theories and integrable systems, with emphasis on the integrability in AdS/CFT. In his works, he contributed to the solution of the AdS/CFT spectral problem, in particular to the solution of crossing equations and to a pioneer derivation of an AdS/CFT analog of Destri-de Vega equations. At present he is working on the bootstrap program for integrable systems at finite volume. This is in line with one of his long-term goals: to understand microscopic mechanisms behind the AdS/CFT duality, in N=4 SYM and beyond, without direct appeal to string theory.
Currently he has several active collaborations with scientists from France, Belgium, UK and USA. Dmytro is teaching an advanced online course on quantum integrability.
John S. Wettlaufer is the A.M. Bateman Professor of Geophysics, Physics and Applied Mathematics at Yale University. His training is in the statistical physics of phase transitions but over the years it has branched out substantially across many disciplines in soft condensed matter physics and applied mathematics with impinging upon biophysics, geophysics and most recently, due to his time here previously, astrophysics.
His stay at Nordita in the fall of 2011 is supported by the Wenner-Gren Foundation, and he has been awarded the Tage Erlander Guest Professorship for 2012. The holder of this chair is appointed by invitation from the Swedish Research Council.
John will be working on the stochastic dynamics generally with applications to abrupt changes in Arctic climate and in fluid dynamics generally. In the former case, the basic problem is one of predicting the future using imperfect and highly variable global climate computer models versus the questionable activity of extrapolating to the future using a 31 year time series of high resolution satellite data. This leaves a spate of possibilities for "simple" mathematical models, rigorous studies of the origin and nature of variability and periodicity, and a focus on the multiplicity of time scales embedded in the data, examined in the context of the singularity spectrum of multifractals. These approaches have an origin in the statistical mechanics of fluctuating systems with major insights originating in stochastic and numerical models of turbulence, dynamos and a wide variety of other systems. He hopes also to begin the process of incorporating the microphysical conditions for planetary accretion studied during his previous visit into the pencil code.
Elizabeth Yang has the overall responsibility for the daily operations, personnel management, coordination and division of labor. Member of the management team, participant at the board as well as any other decision-making bodies. She is also the main responsible for Human Resources at Nordita and takes care of everything that is related to employments.
Elizabeth is Nordita's liaison officer with the T. D. Lee Institute in Shanghai, China.
Elizabeth speaks Swedish, English and Mandarin.
Konstantin Zarembo received his PhD from the Steklov Mathematical Institute in Moscow in 1997. After postdoctoral position at the University of British Columbia in Vancouver in 2001 he moved to the Uppsala University as Assistant Professor. In 2008-2010 he hwas Directeur de Recherche de 2ème classe of CNRS at the École Normale Supérieure in Paris. He became Professor at Nordita in 2010.
Konstantin's field of research is theoretical high-energy physics, with main interests in quantum field theory, string theory and integrable systems. During the last few years he has been working on the AdS/CFT correspondence, mainly on non-perturbative aspects of the relationship between gauge fields and strings, and on exact results in quantum field theory that can be obtained with the help of integrability. He pioneered the use of integrability and the Bethe ansatz in the AdS/CFT correspondence, which has led to new non-perturbative results in quantum field theory. He has also worked on various aspects of string theory, on statistical application of field theory, on color superconductivity and on matrix models.
Aleksandr Zheltukhin received his PhD in 1977 and his DSc in 1992 both at the Joint Institite for Nuclear Physcics in Dubna. In 1992-1994 he was Professor of Mathematics in Kharkov Technical University of Radioelectronics. He has a permanent position in Kharkov Institute for Physics and Technology of Ukrainian Academy of Sciences, where he worked during 25 years in close collaboration with Prof. Dmitry Volkov in studying the theory of quantum fields and their symmetries.
The scientific activity of Aleksandr is in theory strings and branes, supersymmetry, gauge theory and general relativity. He contributed to solving the problem of spontaneous vacuum transitions in the Veneziano and Neveu-Schwartz dual models, hydrodynamical theory of spin waves in space-disordered media, high dimensional generalization of the Regge-Lund approach in string theory, constructing quantum theory of tensionless superstrings and supermembranes, dynamics of superparticles, solution of the problem of covariant division of constraints in the Hamiltonain mechanics of the Green-Schwartz superstring, supersymmetrization of the Feynman-Wheeler action-at-a-distance theory, development of twistor formulation of supersymmetric dynamics of particles and strings which explained mystery of the kappa-symmetry.
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