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Talk
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Scattering Amplitudes, String Models and Gravitational Waves
Ricardo Monteiro Queen Mary University of London
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Talk
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PSI 2017/2018 - Scattering Amplitudes in QFT & String Theory - Lecture 17
Freddy Cachazo Perimeter Institute for Theoretical Physics
PIRSA:18040049 -
PSI 2017/2018 - Scattering Amplitudes in QFT & String Theory - Lecture 16
Freddy Cachazo Perimeter Institute for Theoretical Physics
PIRSA:18040048 -
PSI 2017/2018 - Scattering Amplitudes in QFT & String Theory - Lecture 15
Freddy Cachazo Perimeter Institute for Theoretical Physics
PIRSA:18040047 -
PSI 2017/2018 - Scattering Amplitudes in QFT & String Theory - Lecture 14
Freddy Cachazo Perimeter Institute for Theoretical Physics
PIRSA:18040046 -
PSI 2017/2018 - Scattering Amplitudes in QFT & String Theory - Lecture 13
Freddy Cachazo Perimeter Institute for Theoretical Physics
PIRSA:18040045 -
PSI 2017/2018 - Scattering Amplitudes in QFT & String Theory - Lecture 12
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Thales Azevedo Uppsala University
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Freddy Cachazo Perimeter Institute for Theoretical Physics
PIRSA:18040044 -
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PSI 2017/2018 - Scattering Amplitudes in QFT & String Theory - Lecture 11
Nima Arkani-Hamed Institute for Advanced Study (IAS)
PIRSA:18040159 -
PSI 2017/2018 - Scattering Amplitudes in QFT & String Theory - Lecture 10
Nima Arkani-Hamed Institute for Advanced Study (IAS)
PIRSA:18040043
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Talk
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PSI 2017/2018 - Cosmology - Lecture 15
Kendrick Smith Perimeter Institute for Theoretical Physics
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PSI 2017/2018 - Cosmology - Lecture 14
Kendrick Smith Perimeter Institute for Theoretical Physics
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PSI 2017/2018 - Cosmology - Lecture 13
Kendrick Smith Perimeter Institute for Theoretical Physics
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PSI 2017/2018 - Cosmology - Lecture 12
Kendrick Smith Perimeter Institute for Theoretical Physics
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PSI 2017/2018 - Cosmology - Lecture 11
Kendrick Smith Perimeter Institute for Theoretical Physics
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PSI 2017/2018 - Cosmology - Lecture 10
Kendrick Smith Perimeter Institute for Theoretical Physics
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PSI 2017/2018 - Cosmology - Lecture 9
Kendrick Smith Perimeter Institute for Theoretical Physics
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PSI 2017/2018 - Cosmology - Lecture 8
Kendrick Smith Perimeter Institute for Theoretical Physics
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Talk
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PSI 2017/2018 - Machine Learning for Many Body Physics - Lecture 15
Roger Melko University of Waterloo
PIRSA:18040066 -
PSI 2017/2018 - Machine Learning for Many Body Physics - Lecture 14
Giacomo Torlai Flatiron Institute
PIRSA:18040065 -
PSI 2017/2018 - Machine Learning for Many Body Physics - Lecture 13
Giacomo Torlai Flatiron Institute
PIRSA:18040072 -
PSI 2017/2018 - Machine Learning for Many Body Physics - Lecture 12
Roger Melko University of Waterloo
PIRSA:18040064 -
PSI 2017/2018 - Machine Learning for Many Body Physics - Lecture 11
Roger Melko University of Waterloo
PIRSA:18040063 -
PSI 2017/2018 - Machine Learning for Many Body Physics - Lecture 10
Roger Melko University of Waterloo
PIRSA:18040071 -
PSI 2017/2018 - Machine Learning for Many Body Physics - Lecture 9
Juan Carrasquilla ETH Zurich
PIRSA:18040062 -
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Talk
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Quantum speedup in testing causal hypotheses
Giulio Chiribella University of Hong Kong (HKU)
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The Logic of Physical Law
Stefan Wolf Università della Svizzera italiana
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On the concepts of universality in physics and computer science
Gemma De Las Cuevas Universität Innsbruck
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A no-go theorem for observer-independent facts
Časlav Brukner Austrian Academy of Sciences
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Algorithmic information theory: a critical perspective
Tom Sterkenburg Ludwig-Maximilians-Universität München (LMU)
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Talk
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Wavefunction branches as a foundation for constructing foil theories
Jess Riedel NTT Research
PIRSA:18040082 -
Compatibility of implicit and explicit observers in quantum theory and beyond
Thomas Galley Austrian Academy of Sciences
PIRSA:18040084 -
From observers to physics via algorithmic information theory I
Markus Müller Austrian Academy of Sciences
PIRSA:18040078 -
From observers to physics via algorithmic information theory II
Markus Müller Austrian Academy of Sciences
PIRSA:18040080 -
Motility of the internal-external cut as a foundational principle
Robert Spekkens Perimeter Institute for Theoretical Physics
PIRSA:18040073 -
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Quantum theory cannot consistently describe the use of itself
Renato Renner ETH Zurich
PIRSA:18040085 -
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Talk
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Data Mists, Blockchain Republics, and the Moon Shot
Simon DeDeo Indiana University
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Like penguins on an ice floe: The scary business of adopting open science practices
Benedikt Fecher Alexander von Humboldt-Stiftung
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Collaborative Knowledge Ratchets and Fermat's Library
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Jess Riedel NTT Research
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Luis Batalha Fermat's Library
PIRSA:18030101 -
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What’s not to like? Open science will fail unless it takes the costs seriously
Rosie Redfield University of British Columbia
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Talk
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Gauge Theory, Geometric Langlands, and All That
Edward Witten Institute for Advanced Study (IAS) - School of Natural Sciences (SNS)
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Overview of the global Langlands correspondence
Dima Arinkin University of Wisconsin-Milwaukee
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Gauge theory, vertex algebras and quantum Geometric Langland dualities
Davide Gaiotto Perimeter Institute for Theoretical Physics
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Introduction to local geometric Langlands
Sam Raskin The University of Texas at Austin
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New Directions in Conventional and Ambitwistor String Theories
The goal of the workshop is to foster interaction between researchers working on the S-matrices of conventional strings and on ambitwistor strings. The workshop will exploit synergies between the two frameworks and identify the current key questions in the fields and areas that can benefit from collaboration. The program of the workshop will be tailored to questions and problems raised by the participants in the run-up to the event. The goal is to spend most of the time on collaborative discussions in order to exchange expertise and to attempt to resolve questions during the workshop. A list of such problems can be found below and this will be extended by the participants in the run-up to the meeting. To obtain ambitwistor integrands and Bern-Carrasco-Johansson (BCJ) numerators for multiloop amplitudes and to connect with superstring worldsheet correlators. To develop fully nonlinear approaches by working on curved backgrounds both for application to AdS/CFT and to problems in perturbative gravity and gauge theory on nontrivial backgrounds. To understand the twistor and ambitwistor geometry underpinning both conventional and ambitwistor strings including the geometry of soft limits infrared structure and its links with formulations at null infinity. To explore mathematical structures behind the integrals of conventional and ambitwistor strings (positive geometries and canonical forms twisted (co)-cycle etc.)
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Living Matter
This program is aimed at Master's- and PhD-level students who wish to be exposed to interesting problems in biology that lie at the biology-physics interface. Besides familiarity with basic biology, they will be expected to have an adequate background in physics and/or mathematics. The school will consist of formal lectures as well as informal tutorial sessions.Two themes form the background to the school. First, evolution by natural selection, while being the chief mode of adaptive evolution, is subject to significant constraints, for example, because of intra-molecular correlations between amino acids in proteins or physical forces in multicellular development. Second, some long-term evolutionary outcomes resemble the short-term behaviour of physico-chemical matter that is based on generic, which is to say mechanical and chemical, properties of solids and liquids.The topics to be covered in the lectures are based on these themes and can be outlined in terms of four questions.(a) Do p...
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Living Matter
This program is aimed at Master's- and PhD-level students who wish to be exposed to interesting problems in biology that lie at the biology-physics interface. Besides familiarity with basic biology, they will be expected to have an adequate background in physics and/or mathematics. The school will consist of formal lectures as well as informal tutorial sessions.Two themes form the background to the school. First, evolution by natural selection, while being the chief mode of adaptive evolution, is subject to significant constraints, for example, because of intra-molecular correlations between amino acids in proteins or physical forces in multicellular development. Second, some long-term evolutionary outcomes resemble the short-term behaviour of physico-chemical matter that is based on generic, which is to say mechanical and chemical, properties of solids and liquids.The topics to be covered in the lectures are based on these themes and can be outlined in terms of four questions.(a) Do p...
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PSI 2017/2018 - Scattering Amplitudes in QFT & String Theory (Cachazo)
PSI 2017/2018 - Scattering Amplitudes in QFT & String Theory (Cachazo) -
PSI 2017/2018 - Cosmology (Smith)
PSI 2017/2018 - Cosmology (Smith) -
PSI 2017/2018 - Machine Learning for Many Body Physics (Hayward)
PSI 2017/2018 - Machine Learning for Many Body Physics (Hayward) -
Algorithmic Information, Induction and Observers in Physics
Our universe is of astonishing simplicity: almost all physical observations can in principle be described by a few theories that have short mathematical descriptions. But there is a field of computer science which quantifies simplicity namely algorithmic information theory (AIT). In this workshop we will discuss emerging connections between AIT and physics some of which have recently shown up in fields like quantum information theory and thermodynamics. In particular AIT and physics share one goal: namely to predict future observations given previous data. In fact there exists a gold standard of prediction in AIT called Solomonoff induction which is also applied in artificial intelligence. This motivates us to look at a broader question: what is the role of induction in physics? For example can quantum states be understood as Bayesian states of belief? Can physics be understood as a computation in some sense? What is the role of the observer i.e. the agent that is supposed to perform the predictions? These and related topics will be discussed by a diverse group of researchers from different disciplines.
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Observers in Quantum and Foil Theories
Foil theories sometimes called mathematically rigorous science fiction describe ways the world could have been were it not quantum mechanical. Our understanding of quantum theory has been deepened by contrasting it with these alternatives. So far observers in foil theories have only been modeled implicitly for example via the recorded probabilities of observing events. Even when multi-agent settings are considered these agents tend to be compatible in the classical sense that they could always compare their observations. Scenarios where agents and their memories are themselves modeled as physical systems within the theory (and could in particular measure each other as in Wigner's friend experiment) have not yet been considered. In this workshop we will investigate which foil theories allow for the existence of explicit observers and whether they allow for paradoxes in multi-agent settings such as those found in quantum theory. We will also investigate which interpretations of quantum theory would equally well interpret the foil theories and which interpretations are truly quantum. We will gain a deeper understanding of how this can happen by discussing appropriate definitions observers in these theories and seeing how such observers learn about their environment.
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Open Research: Rethinking Scientific Collaboration
Scientific inquiry in the 21st century is beset with inefficiencies: a flood of papers not read theories not tested and experiments not repeated; a narrow research agenda driven by a handful of high-impact journals; a publishing industry that turns public funding into private profit; the exclusion of many scientists particularly in developing countries from cutting-edge research; and countless projects that are not completed for lack of skilled collaborators. These are all symptoms of a major communication bottleneck within the scientific community; the channels we rely on to share our ideas and findings especially peer-reviewed journal articles and conference proceedings are inadequate to the scale and scope of modern science. The practice of open research doing science on a public platform that facilitates collaboration feedback and the spread of ideas addresses these concerns. Open-source science lowers barriers to entry catalyzing new discoveries. It fosters the real-time sharing of ideas across the globe favoring cooperative endeavor and complementarity of thought rather than wasteful competition. It reduces the influence of publishing monopolies enabling a new credit attribution model based on contributions made rather than references accrued. Overall it democratizes science while creating a new standard of prestige: quality of work instead of quantity of output. This workshop will bring together a diverse group of researchers from fields as diverse as physics biology computer science and sociology committed to open-source science. Together we will review the lessons learnt from various pioneering initiatives such as the Polymath project and Data for Democracy. We will discuss the opportunity to build a new tool similar to the software development platform GitHub to enable online collaborative science. We will consider the challenges associated with the adoption of such a tool by our peers and discuss ways to overcome them. Finally we will sketch a roadmap for the actual development of that tool.
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Gauge Theory, Geometric Langlands and Vertex Operator Algebras
The workshop will explore the relation between boundary conditions in four-dimensional gauge theory the Geometric Langlands program and Vertex Operator Algebras.
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Pressing for Progress: A Discussion Meeting on the Gender Gap in Physics
Science is supposed to be an activity open to all people, regardless of their gender (or, for that matter, their class, ethnicity or caste). However, the practice of science today across the globe falls short of this ideal. The disparity between men and women in the profession is high, especially in the physics discipline, both in India and world-wide.This discussion meeting will address the following questions: What is the nature and extent of gender inequity in the physics profession? Why should practicing physicists care? What has been done so far? What is the way forward? The outcomes from the International Conference On Women in Physics 2017, organised by the International Union of Pure and Applied Physics, will be presented. The planned global gender gap survey by the International Science Council, and addressing sexual harassment in the workplace will also be discussed. This program is the kick-off event of the newly constituted Gender in Physics Working Group of the Indian...
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Pressing for Progress: A Discussion Meeting on the Gender Gap in Physics
Science is supposed to be an activity open to all people, regardless of their gender (or, for that matter, their class, ethnicity or caste). However, the practice of science today across the globe falls short of this ideal. The disparity between men and women in the profession is high, especially in the physics discipline, both in India and world-wide.This discussion meeting will address the following questions: What is the nature and extent of gender inequity in the physics profession? Why should practicing physicists care? What has been done so far? What is the way forward? The outcomes from the International Conference On Women in Physics 2017, organised by the International Union of Pure and Applied Physics, will be presented. The planned global gender gap survey by the International Science Council, and addressing sexual harassment in the workplace will also be discussed. This program is the kick-off event of the newly constituted Gender in Physics Working Group of the Indian...