This afternoon the winner will be announced of the 2015 Physics Nobel Prize. Who wins and based on what discovery? What does this mean for physics research? To what More info

extend do Leiden physicists participate in that research area? Theoretical Physics Professor Carlo Beenakker answers all these questions in a special colloquium. All students and employees of the science faculty are welcome.

On Saturday October 24th, the Leiden Institute of Physics organizes an alumni day for all former students and employees. The participants will hear about the latest discoveries and research developments More info

and get back in touch with familiar faces. The schedule is filled with lectures on cell dynamics, microspectroscopy, mechanical metamaterial behavior and applications of astronomy techniques for the food industry. In between, there is plenty of time for socializing during an extensive lunch and the closing reception. Provided that there are enough participants, shuttle buses will run from train station Leiden Central around 10am. At the bottom of this text you will find information on how to sign up.

Schedule

10:30 - 11:30 Walk-in
11:30 - 11:40 Welcome by Scientific Director Prof. Eric Eliel
11:45 - 12:30 Lecture: Topological Mechanical Metamaterials
12:30 - 14:00 Lunch
14:00 - 14:45 Lecture: Guiding Cells Towards Regeneration
14:45 - 15:30 Lecture: Microspectroscopy of Single Molecules and Single Gold Nanoparticles
15:30 - 16:00 Break
16:00 - 16:45 Lecture: Interaction between Fundamental and Applied Research
17:00 - 19:00 Reception

Lecture Prof. Dr. Vincenzo Vitelli: Topological Mechanical Metamaterials

One of the challenges of modern material science is to create artificial structures whose unconventional mechanical response can be programmed by suitable design of their geometry or topology. Such structures termed mechanical metamaterials can fold in controlled ways or direct sound propagation. In this talk, we discuss metamaterials that exploit topologically protected mechanical states, which that could be used as building blocks for molecular robotics or information storage and read-out. The topological design rules we adopt will be brought to your fingertips using live demonstrations with macroscopic prototypes based on origami-like and cellular structures.

Lecture Dr. Doris Heinrich: Guiding Cells Towards Regeneration

Our insight into cellular behaviour is advanced by profound understanding of cytoskeleton dynamics and cellular response to external cues. The very survival of many cell types in the human body depends upon their perpetual active motions, which require internal structural changes. Control of cell functions will find wide applications in novel diagnostic assays and in regenerative medicine.

Lecture Prof. Dr. Michel Orrit: Microspectroscopy of Single Molecules and Single Gold Nanoparticles

The optical isolation of single gold nanoparticles leads to their spectroscopic study on a single-particle basis and, through their plasmonic properties, to the study of their direct surroundings. This general idea will be illustrated with some recent experiments from our laboratory.

Lecture Prof. Dr. Marco Beijersbergen: Interaction between Fundamental and Applied Research: Astronomy technology in the food industry

After studying physics and obtaining his PhD at Leiden University, Marco Beijersbergen founded a company for developing custom-made measurement systems—Cosine Measurement Systems. These systems have applications for astronomy and other science projects, but also for practical problems on earth.

Sign Up
You can sign up until October 15th by filling out the form at the bottom of this link. We ask you to transfer €10,- to Universiteit Leiden at NL78RABO0102468869 citing SAP2008502041, as confirmation of your participation.

Tonight at 19:30, Paul Townsend (Cambridge, DAMPT) will kick off this year's series of the famous Colloquium Ehrenfestii. These lectures are organized about eight times a year, in the main More info

auditorium of the Oort building.

Abstract

Let's Twist Again - Revisiting the relation between supersymmetry, twistors and the division algebras

The Lorentz and conformal algebras in spacetime dimension D=3,4,6,10 are isomorphic to Sl(2;K) and Sp(4;K) for K=R,C,H,O, the four division algebras (the definitions are non-standard for K=O because octonionic multiplication is not associative). These are also the dimensions that allow a super-Yang-Mills theory, for which the free-field
limit can be found by quantization of the massless superparticle.

Many years ago it was found that the D=3,4,6 massless superparticle has a manifestly superconformal formulation in terms of supertwistors; i.e. spinors of the superconformal group. The mass-shell constraint is replaced by U(1;K) ``spin-shell’’ constraints that determine the supermultiplet helicities. More recently, a supertwistor formulation has been found for the massive superparticle, which can be viewed as a special case of the massless superparticle in D=4,6,10,11. The mass-shell constraint is now replaced by U(2;K) constraints which imply that the quantum superparticle describes a (massive) supermultiplet of zero "superspin".

An account will be given of this circle of ideas relating division algebras supersymmetry and twistors in the simple context of particle mechanics.

Professor Aske Plaat from the Leiden Institute of Advanced Computer Science will give an LCN2 seminar on September 25th at 16:00 in room HL214, titled 'Ebola. Big Data More info

and Complex Networks in the Real World'.

Abstract
In 2014, as the Ebola epidemic in West Africa progressed, the world witnessed in all its horrific glory a complex network in action. Doctors, epidemiologists, complex network scientists, and data scientists have worked hard to counter the disease, and now the outbreak appears to be almost over. From a complex networks perspective the Ebola case affords a possibility to see how our theories hold up, and what there is to be learned. In this talk I will give a brief overview of the Ebola outbreak from a data science perspective, and discuss some of the issues that occurred as science met the real world.

Preliminary LCN2 Seminar Schedule - 2015
March 27, 16:00-17:00, HL214
April 24, 16:00-17:00, HL214
May 29, 16:00-17:00, HL214
June 26, 16:00-17:00, HL214
September 25, 16:00-17:00, HL214
October 30, 16:00-17:00, HL106
November 27, 16:00-17:00, HL106
December 18, 16:00-17:00, HL214

Q. Wang, J. J. Renema, A. Gaggero, F. Mattioli, R. Leoni, M. P. van Exter and M. J. A. de Dood (2015) How noise affects quantum detector tomography, J. Appl. Phys., 10, 118, 134501. [DOI]

S.B. Roobol, M.E. Cañas Ventura, M. Bergman, M.A. van Spronsen, W.G. Onderwaater, P.C. van der Tuijn, R. Koehler, A. Ofitserov G.J.C. van Baarle, J.W.M. Frenken (2015) The ReactorAFM: Non-contact atomic force microscope operating under high-pressure and high-temperature catalytic conditions., Rev. Sci. Instrum. , 86, 033706. [DOI]

Agenda

9 Oct, 12:16

Van der Waals Colloquium TBA: TBA

13 Oct, 14:00, room 276

Theory seminar Petr Jizba, Faculty of Nuclear Sciences and Physical Engineering (FNSPE)
Czech Technical University in Prague
: Inflationary cosmology from quantum Conformal Gravity