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Faculty Colloquium
Faculty Colloquium
Time: 08/01/201810:00  11:00
Location: C1.110, Science Park 904, Amsterdam
Description: Monthly meeting for all employees of the UvA Faculty of Science.
Programme:
10:00 Update by the the dean
10:30: Academic highlight: Belowground communication of plants with other organisms (Harro Bouwmeester, SILS)
10:45 Coffee

GRAPPA Journal Club
GRAPPA Journal Club
Time: 08/01/201813:30  14:30
Location: C4.174, Science Park 904, Amsterdam
Description: Weekly GRAPPA journal club. Papers can be posted here.
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GRAPPA/API Colloquium: Laura Nuttall
GRAPPA/API Colloquium: Laura Nuttall
Time: 10/01/201809:45  10:45
Location: C4.174, Science Park 904, Amsterdam
Title: The LIGO Detectors and How Data Quality Affects the Search for Gravitational Waves
Abstract: To date seven distinct gravitationalwave signals from binary black hole mergers and a binary neutron star merger have been detected, allowing us to look at the Universe in an entirely new way. These discoveries would not have been possible without the improvements made to the LIGO and Virgo detectors since 2010. Interferometric gravitationalwave detectors are some of the most complex instruments ever built; understanding their output is a huge challenge. Detector performance will change on a daily basis due to environmental, hardware and software issues. The data often contain many long and short duration artefacts which can mask or mimic a true gravitationalwave signal. In this talk, I will discuss recent challenges of characterising the LIGO detectors, how short duration artefacts affect the search for compact binary coalescences and the LIGO instruments themselves.
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Nikhef Colloquium: Edward P.J. van den Heuvel
Nikhef Colloquium: Edward P.J. van den Heuvel
Time: 12/01/201811:00  12:00
Location: H331, Nikhef, Amsterdam
Title: Models for the Formation of Close Double Neutron Stars in Galaxies and the LIGO DoubleNeutronStar Merger Event GW170817
Abstract: The LIGO event GW170817 demonstrated that double neutron star mergers take place in galaxies. All our knowledge about double neutron stars comes for the twenty double neutron stars that have so far been discovered in our galaxy as binary radio pulsars. The first such system was discovered in 1974 by Joseph Taylor and Russel Hulse, who were awarded the 1993 Physics Nobel Prize for the discovery that the orbital period of this system decays at a rate exactly as predicted by Einstein’s General Relativity Theory for orbital decay due to the emission of gravitational waves. Our ideas about how close double neutron stars form, date from the 1970s and will be reviewed here. Based on what we know about the double neutron star population in our Galaxy and on models of their formation, predictions can be made about the merger event rate expected for LIGO. The fact that LIGO already observed one such event means that either we have been very lucky or that for some unknown reason the actual merger rate is higher than predicted so far.

Dutch Cosmology Meeting
Dutch Cosmology Meeting
Time: 12/01/201811:45  16:30
Location: Room A900, Broerstraat 5, Groningen
Brief schedule:
– Coffee
– 12:00  13:00: Andrew Tolley: Positivity Constraints on Effective Field Theories of Gravity
Lunch
– 14:00  15:00: Enrico Pajer: From Symmetries to Cosmological Observables
– Coffee
– 15:30  16:30: Daan Meerburg: Cosmological Challenges: Neutrino Mass
More details including abstracts can be found on the THC website.

String Journal Club
String Journal Club
Time: 12/01/201812:30  14:00
Location: C4.278, Science Park 904, Amsterdam
Description: Weekly string theory journal club with paper discussion and talk by a group member. Papers can be posted here.
Talk: Sam van Leuven: Towards NonAdS Holography via the Long String Phenomenon
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Vossius Seminar: Elena Castellani
Vossius Seminar: Elena Castellani
Time: 15/01/201811:00  12:00
Location: Artis Library, Plantage Middenlaan 4545 A, Amsterdam
Title: Scientific Methodology and Fundamental Physics: The Case of Early String Theory
Abstract: Today's theoretical developments in fundamental physics mostly concern regimes (energy scales or length scales) far away from current possibility of empirical access. Nevertheless, many of these developments – such as, first of all, those included in the string theoretical framework – have attained a high degree of trust among part of the scientific community. This has raised a lively debate on whether this trust is justified, and, in case, on what basis. For some people, the extent to which empirically still unconfirmed theories are trusted today indicates a substantial change in scientific methodology. The criticism is that in these cases the assessed scientific way of proceeding and reasoning is not respected.
This talk is devoted to discussing the question as to whether the methodology followed in building/assessing string theory can be considered 'scientific' in the same sense, say, that the methodology followed in building/assessing the Standard Model of particle physics is scientific. Its aim is to present arguments for a positive answer to this question by relying on a historical analysis of the early developments of string theory.

GRAPPA Journal Club
GRAPPA Journal Club
Time: 15/01/201813:30  14:30
Location: C4.174, Science Park 904, Amsterdam
Description: Weekly GRAPPA journal club. Papers can be posted here.
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String Seminar: Daniel Friedan
String Seminar: Daniel Friedan
Time: 16/01/201811:00  12:30
Location: G2.02, Science Park 904, Amsterdam
Title: A New Kind of Quantum Field Theory of (n1)Dimensional Objects in 2n Dimensions
Abstract: I describe a project to open a new territory of quantum field theory where the fields live not on spacetime but on certain complete metric spaces of (n1)dimensional objects in a 2ndimensional spacetime manifold M. These metric spaces are ``quasi Riemann surfaces''; their geometric properties are formally analogous to Riemann surfaces. Every construction of an ordinary 2d conformal field theory is to give an analogous construction of a cft on the quasi Riemann surfaces, and thereby a cft on spacetime. The global symmetry group of the 2d cft will become a local gauge symmetry. A local quantum field theory in spacetime will be constructed by restricting to small objects. I envision a wide expanse of new quantum field theory to explore. (Preseminar at 11:00, talk at 11:30.)
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Dutch Holography Meeting
Dutch Holography Meeting
Time: 19/01/201810:30  18:00
Location: City Hall, Brussels, Belgium
Brief schedule:
– Coffee/Tea
– 11:15  12:15  Ofer Aharony: The Renormalization Group Flow in Field Theories with Quenched Disorder
– Lunch buffet
– 13:30  14:30  Rodolfo Russo: AdS3 Holographic Correlators with Heavy States
– Coffee/Tea
– 15:00  16:00  Tom Hartman: TBA
– 16:00  17:00  Alejandra Castro: Black Holes: Designing & Decoding Counting Formulas
– Belgian Drinks
More details including abstracts can be found on the DITP website.
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GRAPPA Journal Club
GRAPPA Journal Club
Time: 22/01/201813:30  14:30
Location: C4.174, Science Park 904, Amsterdam
Description: Weekly GRAPPA journal club. Papers can be posted here.

Nikhef Theory Seminar: Ivano Lodato
Nikhef Theory Seminar: Ivano Lodato
Time: 22/01/201816:00  17:00
Location: H331, Nikhef, Amsterdam
Title: BMS Algebra and its SUSY Extensions in 3D
Abstract: In this talk, I will first review the basics of asymptotic symmetry algebras of (flat) spacetimes, the BMS algebras, focusing on the 4dimensional case. I will then give a (nonexhaustive) overview of the recent developments on the connection between BMS algebras , the gravitational Smatrix and the socalled 'memory effect' . For the 3dimensional case, I will show that an ultrarelativistic, flat, InonuWigner contraction of the Virasoro algebra gives rise to the BMS algebra and, hence, argue its relevance in the field of flatholography. I will then show how this procedure can be exploited to obtain all supersymmetric extensions of the BMS_3 algebra, some of which are completely novel and possess peculiar energy bounds.
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Physics@Veldhoven
Physics@Veldhoven
Time: 23/01/2018
Location: NH Conference Center Koningshof, Veldhoven
Physics@Veldhoven is a large congress that provides a topical overview of physics in the Netherlands.
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Physics@Veldhoven
Physics@Veldhoven
Time: 24/01/2018
Location: NH Conference Center Koningshof, Veldhoven
Physics@Veldhoven is a large congress that provides a topical overview of physics in the Netherlands.
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Cosmology Journal Club
Cosmology Journal Club
Time: 25/01/201811:00  12:00
Location: C4.278, Science Park 904, Amsterdam
Description: Weekly cosmology journal club. Papers can be posted here.

IoP Colloquium: Liang Fu
IoP Colloquium: Liang Fu
Time: 25/01/201816:00  17:00
Location: C0.05, Science Park 904, Amsterdam
Title: From Topological Materials to Protected Qubits
Abstract:: The past decade has seen remarkable progress in our understanding of topological states of matter, which exibit robust universal properties determined by the topology of quantum ground states. Topological insulators and metals are found to be widespread in solids and the material search for topological superconductors is rapidly advancing. Topological superconductors are theoretically predicted to host emergent Majorana fermions, fractional quasiparticles that are their own antiparticles. It is expected that spatially separated Majorana fermions can store quantum information in a protected manner. I will outline the physics of topological quantum materials based on the Dirac equation and describe recent efforts in making topological superconductors, detecting Majorana fermions and engineering platforms for robust quantum computation.
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GRAPPA Journal Club
GRAPPA Journal Club
Time: 29/01/201813:30  14:30
Location: C4.174, Science Park 904, Amsterdam
Description: Weekly GRAPPA journal club. Papers can be posted here.
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