Effective Theory of General Relativity
Emil Bjerrum-Bohr
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Cosmology Observations
Will Percival - University of Waterloo
Theory of Gravitational Waves
Ira Rothstein - Carnegie Mellon University
Theory of Gravitational Waves
Ira Rothstein - Carnegie Mellon University
PSI 2017/2018 - Condensed Matter - Lecture 3
Rakesh Tiwari - McGill University - Department of Physics
Bravais lattices, reciprocal lattices, electrons in a periodic potential, Bloch's theorem
A model-independent search for gravitational-wave echoes
Archisman Ghosh - Institucio Catalana de Recerca I Estudis Avancats (ICREA) - Universitat de Barcelona
Exotic compact objects (e.g. boson stars, dark matter stars, gravastars), and certain quantum modifications to black holes (e.g. firewalls) are speculated to give out ``echoes'' or bursts of radiation appearing at regular time intervals due to a perturbation by any infalling matter or field. In…
Improvements on the methods for searching echoes
Julian Westerweck - Albert Einstein Institute
The recent detections of merging black holes allow for observational tests of the nature of these objects, such as searching for the GW echo signals proposed in some models. Tentative evidence for these was presented, found in an analysis based upon methods for GW data analysis as demonstrated on…
Echoes from the Abyss: Tentative Evidence for Planck-Scale Structure at Black Hole Horizons
Jahed Abedi - University of Stavanger (UiS)
In classical General Relativity (GR), an observer falling into an astrophysical black hole is not expected to experience anything dramatic as she crosses the event horizon. However, tentative resolutions to problems in quantum gravity, such as the cosmological constant problem, or the black hole…
Quantifying the evidence for black holes with GW and EM probes
Paolo Pani - Instituto Superior Tecnico - Departamento de Física
PSI 2017/2018 - Quantum Field Theory II - Lecture 3
Francois David - CEA Saclay
Propagator of the free scalar field, Correlation functions
New Vistas from the Many-Instant Landscape
Henrique Gomes - University of Oxford
Quantum gravity has many conceptual problems. Amongst the most well-known is the "Problem of Time": gravitational observables are global in time, while we would really like to obtain probabilities for processes taking us from an observable at one time to another, later one. Tackling these questions…
Scattering Amplitudes and the Associahedron
Yuntao Bai - California Institute of Technology (Caltech) - Division of Physics Mathematics & Astronomy
We establish a direct connection between scattering amplitudes for bi-adjoint scalar theories and a classic polytope--the "associahedron"--known to mathematicians since the 1960s. We find an associahedron naturally living in kinematic space. The tree level scattering amplitude is simply a geometric…
Baryon-dark matter interactions and the radial acceleration relation
Riccardo Penco - University of Pennsylvania
The radial acceleration relation is an empirical universal scaling relation between the total gravitational field and the Newtonian acceleration generated by baryons at any given radius within spiral galaxies. In this talk, I will discuss the possibility that such a relation arises from interactions…
PSI 2017/2018 - Condensed Matter - Lecture 2
Rakesh Tiwari - McGill University - Department of Physics
Fock space, creation and annihilation operators, one- and two-particle operators in second quantization
PSI 2017/2018 - Quantum Field Theory II - Lecture 2
Francois David - CEA Saclay
Operators and correlation functions in the path integral formalism, Thermal expectation values, Free scalar field