Search results from PIRSA
Format results
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Talk
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PSI 2017/2018 - Quantum Information - Lecture 14
Daniel Gottesman University of Maryland, College Park
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PSI 2017/2018 - Quantum Information - Lecture 13
Daniel Gottesman University of Maryland, College Park
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PSI 2017/2018 - Quantum Information - Lecture 12
Daniel Gottesman University of Maryland, College Park
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PSI 2017/2018 - Quantum Information - Lecture 11
Daniel Gottesman University of Maryland, College Park
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PSI 2017/2018 - Quantum Information - Lecture 10
Daniel Gottesman University of Maryland, College Park
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PSI 2017/2018 - Quantum Information - Lecture 9
Daniel Gottesman University of Maryland, College Park
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PSI 2017/2018 - Quantum Information - Lecture 8
Daniel Gottesman University of Maryland, College Park
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PSI 2017/2018 - Quantum Information - Lecture 7
Daniel Gottesman University of Maryland, College Park
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PSI 2017/2018 - Beyond Standard Model - Lecture 4
PIRSA:18030075 -
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PSI 2017/2018 - Foundations of Quantum Mechanics - Lecture 15
Lucien Hardy Perimeter Institute for Theoretical Physics
PIRSA:18020074 -
PSI 2017/2018 - Foundations of Quantum Mechanics - Lecture 14
Robert Spekkens Perimeter Institute for Theoretical Physics
PIRSA:18020073 -
PSI 2017/2018 - Foundations of Quantum Mechanics - Lecture 13
Robert Spekkens Perimeter Institute for Theoretical Physics
PIRSA:18020072 -
PSI 2017/2018 - Foundations of Quantum Mechanics - Lecture 12
Robert Spekkens Perimeter Institute for Theoretical Physics
PIRSA:18020071 -
PSI 2017/2018 - Foundations of Quantum Mechanics - Lecture 11
Robert Spekkens Perimeter Institute for Theoretical Physics
PIRSA:18020070 -
PSI 2017/2018 - Foundations of Quantum Mechanics - Lecture 10
Robert Spekkens Perimeter Institute for Theoretical Physics
PIRSA:18020069 -
PSI 2017/2018 - Foundations of Quantum Mechanics - Lecture 9
Lucien Hardy Perimeter Institute for Theoretical Physics
PIRSA:18020068 -
PSI 2017/2018 - Foundations of Quantum Mechanics - Lecture 8
Lucien Hardy Perimeter Institute for Theoretical Physics
PIRSA:18020067
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PSI 2017/2018 - Cosmology - Lecture 15
David Kubiznak Charles University
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PSI 2017/2018 - Cosmology - Lecture 14
David Kubiznak Charles University
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PSI 2017/2018 - Cosmology - Lecture 13
David Kubiznak Charles University
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PSI 2017/2018 - Cosmology - Lecture 12
David Kubiznak Charles University
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PSI 2017/2018 - Cosmology - Lecture 11
David Kubiznak Charles University
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PSI 2017/2018 - Cosmology - Lecture 10
David Kubiznak Charles University
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Talk
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PSI 2017/2018 - Quantum Field Theory III - Lecture 16
Dan Wohns Perimeter Institute for Theoretical Physics
PIRSA:18020036 -
PSI 2017/2018 - Quantum Field Theory III - Lecture 15
Dan Wohns Perimeter Institute for Theoretical Physics
PIRSA:18020035 -
PSI 2017/2018 - Quantum Field Theory III - Lecture 14
Dan Wohns Perimeter Institute for Theoretical Physics
PIRSA:18020034 -
PSI 2017/2018 - Quantum Field Theory III - Lecture 13
Dan Wohns Perimeter Institute for Theoretical Physics
PIRSA:18020033 -
PSI 2017/2018 - Quantum Field Theory III - Lecture 12
Dan Wohns Perimeter Institute for Theoretical Physics
PIRSA:18020032 -
PSI 2017/2018 - Quantum Field Theory III - Lecture 11
Gang Xu Perimeter Institute for Theoretical Physics
PIRSA:18020031 -
PSI 2017/2018 - Quantum Field Theory III - Lecture 10
Gang Xu Perimeter Institute for Theoretical Physics
PIRSA:18020099 -
PSI 2017/2018 - Quantum Field Theory III - Lecture 9
Gang Xu Perimeter Institute for Theoretical Physics
PIRSA:18020030
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Quantum Field Theory for Cosmology (AMATH872/PHYS785) - Lecture 24
Achim Kempf University of Waterloo
PIRSA:18040029 -
Quantum Field Theory for Cosmology (AMATH872/PHYS785) - Lecture 23
Achim Kempf University of Waterloo
PIRSA:18040028 -
Quantum Field Theory for Cosmology (AMATH872/PHYS785) - Lecture 22
Achim Kempf University of Waterloo
PIRSA:18030056 -
Quantum Field Theory for Cosmology (AMATH872/PHYS785) - Lecture 21
Achim Kempf University of Waterloo
PIRSA:18030055 -
Quantum Field Theory for Cosmology (AMATH872/PHYS785) - Lecture 20
Achim Kempf University of Waterloo
PIRSA:18030054 -
Quantum Field Theory for Cosmology (AMATH872/PHYS785) - Lecture 19
Achim Kempf University of Waterloo
PIRSA:18030053 -
Quantum Field Theory for Cosmology (AMATH872/PHYS785) - Lecture 18
Achim Kempf University of Waterloo
PIRSA:18030052 -
Quantum Field Theory for Cosmology (AMATH872/PHYS785) - Lecture 17
Achim Kempf University of Waterloo
PIRSA:18030051
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PSI 2017/2018 - Gravitational Physics - Lecture 13
Ruth Gregory King's College London
PIRSA:18010033 -
PSI 2017/2018 - Gravitational Physics - Lecture 12
Ruth Gregory King's College London
PIRSA:18010032 -
PSI 2017/2018 - Gravitational Physics - Lecture 11
Ruth Gregory King's College London
PIRSA:18010031 -
PSI 2017/2018 - Gravitational Physics - Lecture 10
Ruth Gregory King's College London
PIRSA:18010030 -
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PSI 2017/2018 - Condensed Matter - Lecture 15
Alioscia Hamma University of Naples Federico II
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PSI 2017/2018 - Condensed Matter - Lecture 14
Alioscia Hamma University of Naples Federico II
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PSI 2017/2018 - Condensed Matter - Lecture 13
Alioscia Hamma University of Naples Federico II
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PSI 2017/2018 - Condensed Matter - Lecture 12
Alioscia Hamma University of Naples Federico II
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PSI 2017/2018 - Condensed Matter - Lecture 11
Alioscia Hamma University of Naples Federico II
PIRSA:18010082 -
PSI 2017/2018 - Condensed Matter - Lecture 10
Alioscia Hamma University of Naples Federico II
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PSI 2017/2018 - Condensed Matter - Lecture 9
Alioscia Hamma University of Naples Federico II
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PSI 2017/2018 - Condensed Matter - Lecture 8
Alioscia Hamma University of Naples Federico II
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IQC - Quantum Error Correction - Lecture 12
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Daniel Gottesman University of Maryland, College Park
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Beni Yoshida Perimeter Institute for Theoretical Physics
PIRSA:18030013 -
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IQC - Quantum Error Correction - Lecture 11
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Daniel Gottesman University of Maryland, College Park
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Beni Yoshida Perimeter Institute for Theoretical Physics
PIRSA:18030012 -
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IQC - Quantum Error Correction - Lecture 10
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Daniel Gottesman University of Maryland, College Park
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Beni Yoshida Perimeter Institute for Theoretical Physics
PIRSA:18030011 -
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IQC - Quantum Error Correction - Lecture 9
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Daniel Gottesman University of Maryland, College Park
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Beni Yoshida Perimeter Institute for Theoretical Physics
PIRSA:18030010 -
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IQC - Quantum Error Correction - Lecture 8
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Daniel Gottesman University of Maryland, College Park
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Beni Yoshida Perimeter Institute for Theoretical Physics
PIRSA:18030009 -
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IQC - Quantum Error Correction - Lecture 7
Daniel Gottesman University of Maryland, College Park
PIRSA:18020011 -
IQC - Quantum Error Correction - Lecture 6
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Daniel Gottesman University of Maryland, College Park
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Beni Yoshida Perimeter Institute for Theoretical Physics
PIRSA:18020010 -
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IQC - Quantum Error Correction - Lecture 5
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Daniel Gottesman University of Maryland, College Park
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Beni Yoshida Perimeter Institute for Theoretical Physics
PIRSA:18020009 -
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Welcome and Opening Remarks
Neil Turok University of Edinburgh
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The significance of the proper time in the quantum mechanics of the gravitational field.
Claudio Bunster Centro de Estudios Científicos (CECs)
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TBA
Viatcheslav Mukhanov Ludwig-Maximilians-Universität München (LMU)
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Semi-classical evaluation of the 3D gravity path integral and quasi-local holography
Bianca Dittrich Perimeter Institute for Theoretical Physics
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TBA
Emil Mottola Los Alamos National Laboratory
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An asymptotically safe point of view on the gravitational path integral
Astrid Eichhorn Universität Heidelberg
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The path integral for gravity and Fedosov quantization
Stefan Hollands Universität Leipzig
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Surprises in the Path Integral for Gravity
Neil Turok University of Edinburgh
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PSI 2017/2018 - Quantum Information (Gottesman)
PSI 2017/2018 - Quantum Information (Gottesman) -
PSI 2017/2018 - Beyond Standard Model (Burgess)
PSI 2017/2018 - Beyond Standard Model (Burgess) -
Computational Methods for General Relativistic Magnetohydrodynamics: con2prim an
Computational Methods for General Relativistic Magnetohydrodynamics are important means of studying compact astrophysical objects such as neutron stars and core-collapse supernovae relevant e.g. to understand sources of gravitational radiation.Particular crucial elements of such methods including solving non-linear equations to extract the microphysical state from the conserved fluxes (endearingly called con2prim) or handling realistic equations of state (EOS) that are only given approximately in a tabulated manner. The state of the art for algorithms addressing these issue leaves to be desired and significantly limits stabilityaccuracy and performance of todays calculations.This workshop aims to review the known algorithmic and computational shortcomings list requirements that an ideal solution should haveand discuss potential practical solutions.
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PSI 2017/2018 - Foundations of Quantum Mechanics (Spekkens, Hardy)
PSI 2017/2018 - Foundations of Quantum Mechanics (Spekkens, Hardy) -
PSI 2017/2018 - Cosmology (Kubiznak)
PSI 2017/2018 - Cosmology (Kubiznak) -
PSI 2017/2018 - Quantum Field Theory III (Gomis, Xu, Wohns)
PSI 2017/2018 - Quantum Field Theory III (Gomis, Xu, Wohns) -
Quantum Field Theory for Cosmology (Kempf)
Quantum Field Theory for Cosmology (Kempf) -
PSI 2017/2018 - Standard Model (Tulin)
PSI 2017/2018 - Standard Model (Tulin) -
PSI 2017/2018 - Gravitational Physics (Gregory)
PSI 2017/2018 - Gravitational Physics (Gregory) -
PSI 2017/2018 - Condensed Matter (Hamma)
PSI 2017/2018 - Condensed Matter (Hamma) -
IQC - Quantum Error Correction (Gottesman and Yoshida)
IQC - Quantum Error Correction (Gottesman and Yoshida) -
The Path Integral for Gravity
Over the past three decades, the idea of a path integral over geometries, describing gravity in various dimensions, has become increasingly central to many areas of theoretical physics, including string and M-theory, holography and quantum aspects of black holes and cosmology.
In each of these areas, the path integral is frequently invoked as a formal device although, as practitioners will admit, except in very special cases the basic formula remains undefined. Typically, classical saddle points are discussed, whether real or complex, but the required integrals are left unperformed.
This state of affairs is untenable because it leaves the theory on a shaky footing and hence does not permit a sound comparison of theoretical predictions with observations. The time has come to critically reassess the foundational ideas of the path integral for gravity, including its definition, evaluation and interpretation; to identify problems with
existing uses and claims based on it, and to seek improvements. The workshop will focus on the continuum theory and its semiclassical limit, with applications to cosmology, black holes and holography. In particular, the notion of a “Euclidean path integral” for a “wavefunction of the universe” will be addressed.To this effect we intend to revisit discussion of “quantum geometrodynamics” from the path integral viewpoint and to pursue various applications. The developments in this direction that took place in the late 1970's and early 1980's were not incorporated in subsequent efforts, where the emphasis shifted to using a classical background with quantum fluctuations superimposed on it, a split which although useful in particular approximations can hardly be imagined to lie at the foundation of the theory. The revival of the discussion of the foundation of the path integral for gravity is made timely, we believe, by the introduction of new global methods such as Picard-Lefschetz theory.
The format of the workshop will be unusual. For the first three days, the mornings will begin with a longer, introductory lecture by each of the three organisers, setting out some of the foundational issues. This will be followed by shorter lectures by the participants, tackling the same foundational questions. The morning lectures, held in the Bob room, will be open to all Perimeter residents and visitors. They will be recorded and made available for viewing on PIRSA. Afternoons will be devoted to friendly and informal discussions, with participants invited to offer short contributions which follow up or develop points raised in the mornings, within a relaxed and highly conducive environment. Participation in these afternoon discussion sessions, as well as social events associated with the workshop, will be limited to registered workshop participants. The last two days of the workshop will be an opportunity for participants to continue discussions on topics which emerge as of greatest general interest, as well as to follow up in smaller groups on technical points or new ideas.