Conveners
M2-2 Classical and Quantum Gravity II (DTP) / Gravité classique et quantique II (DPT)
- Sanjeev Seahra
-
Dr Chen Zhang (University of Toronto and University of Waterloo)07/06/2021, 12:45Theoretical Physics / Physique théorique (DTP-DPT)Oral (Non-Student) / Orale (non-étudiant(e))
We study the response of a static Unruh-DeWitt detector outside an exotic compact object (ECO) with a variety of (partially) reflective boundary conditions in 3+1 dimensions. The horizonless ECO, whose boundary is extremely close to the would-be event horizon, acts as a black hole mimicker. We find that the response rate is notably distinct from the black hole case, even when the ECO...
Go to contribution page -
Saeed Rastgoo (York University)07/06/2021, 12:48Theoretical Physics / Physique théorique (DTP-DPT)Oral (Non-Student) / Orale (non-étudiant(e))
We derive Loop Quantum Gravity corrections to the Raychaudhuri equation in the interior of a Schwarzschild black hole and near the classical singularity for several schemes of quantization. We show that the resulting effective equation implies defocusing of geodesics due to the appearance of repulsive terms. This prevents the formation of conjugate points, renders the singularity theorems...
Go to contribution page -
Dr David Kubiznak (Perimeter Institute/University of Waterloo)07/06/2021, 12:51Theoretical Physics / Physique théorique (DTP-DPT)Oral (Non-Student) / Orale (non-étudiant(e))
A relativistic theory of gravity like general relativity produces phenomena differing fundamentally from Newton’s theory. An example, analogous to electromagnetic induction, is gravitomagnetism, or the dragging of inertial frames by mass-energy currents. These effects have recently been confirmed by classical observations. Here we show, for the first time, that they can be observed by a...
Go to contribution page -
Vladimir Dergachev (AEI Hannover)07/06/2021, 12:54Theoretical Physics / Physique théorique (DTP-DPT)Oral (Non-Student) / Orale (non-étudiant(e))
Continuous waves from non-axisymmetric neutron stars are orders of magnitude weaker than transient events from black hole and neutron star collisions. Unlike a transient event, a continuous wave source will allow repeated observations. We will present results of all-sky searches for neutron stars and other sources carried out by the Falcon pipeline and discuss interplay between detector...
Go to contribution page -
Mr Nayyer Raza07/06/2021, 12:57Theoretical Physics / Physique théorique (DTP-DPT)Oral Competition (Graduate Student) / Compétition orale (Étudiant(e) du 2e ou 3e cycle)
Our current understanding of the core-collapse supernova explosion mechanism is incomplete, with multiple viable models for how the initial shock wave might be energized enough to lead to a successful explosion. Detection of a gravitational wave (GW) signal emitted in the initial few seconds after core-collapse would provide unique and crucial insight into this process. With the Advanced LIGO...
Go to contribution page -
Turkuler Durgut (Memorial University of Newfoundland)07/06/2021, 13:00Theoretical Physics / Physique théorique (DTP-DPT)Oral Competition (Graduate Student) / Compétition orale (Étudiant(e) du 2e ou 3e cycle)
In this talk, I will consider the stability of asymptotically anti-de Sitter gravitational solitons. These are globally stationary, asymptotically (globally) AdS spacetimes with positive energy but without horizons. I will introduce my ongoing project investigating solutions of the linear wave equation in this class of backgrounds. I will provide analytical expressions for the behavior of the...
Go to contribution page -
Alan Knee (University of British Columbia)07/06/2021, 13:03Theoretical Physics / Physique théorique (DTP-DPT)Oral Competition (Graduate Student) / Compétition orale (Étudiant(e) du 2e ou 3e cycle)
The mass and spin properties of black hole binaries inferred from their gravitational-wave signatures reveal important clues about how these binaries form. For instance, stellar-mass black holes that evolved together from the same binary star will have spins that are preferentially aligned with their orbital angular momentum. Alternatively, if the black holes formed separately from each other...
Go to contribution page -
Gregory Kaplanek07/06/2021, 13:06Theoretical Physics / Physique théorique (DTP-DPT)Oral not-in-competition (Graduate Student) / Orale non-compétitive (Étudiant(e) du 2e ou 3e cycle)
Perturbation theory for gravitating quantum systems tends to fail at very late times (a type of perturbative breakdown known as secular growth). We argue that gravity is best treated as a medium/environment in such situations, where reliable late-time predictions can be made using tools borrowed from quantum optics. To show how this works, we study the explicit example of a qubit hovering just...
Go to contribution page