Conveners
T2-7 Gravity, Astrophysics and Cosmology (DTP) / Gravité, astrophysique et cosmologie (DPT)
- Svetlana Barkanova (Acadia University)
Masoud Ghezelbash
(University of Saskatchewan)
14/06/2016, 13:15
Theoretical Physics / Physique théorique (DTP-DPT)
Invited Speaker / Conférencier invité
We present new classes of exact solutions to the five dimensional Einstein gravity with cosmological constant, coupled to the Maxwell and dilation fields. The theory has two coupling constants for dilation-Maxwell and dilation-cosmological constant terms. The solutions are non-stationary and moreover almost regular everywhere for non-zero coupling constants. The cosmological constant depends...
Prof.
Ariel Edery
(Bishop's University)
14/06/2016, 13:45
Theoretical Physics / Physique théorique (DTP-DPT)
Oral (Non-Student) / orale (non-étudiant)
Recently, it has been pointed out that dimensionless actions in four dimensional curved spacetime possess a symmetry which goes beyond scale invariance but is smaller than full Weyl invariance. This symmetry was dubbed *restricted Weyl invariance*. We show that starting with a restricted Weyl invariant action that includes pure $R^2$ gravity and a Higgs sector with no explicit mass, one can...
Robert Mann
(University of Waterloo)
14/06/2016, 14:00
Theoretical Physics / Physique théorique (DTP-DPT)
Oral (Non-Student) / orale (non-étudiant)
In non-relativistic physics a geoid is a surface of constant gravitational potential. Here I propose, in the context of general relativity, the notion of a geoid -- a surface of constant "gravitational potential". This idea emerges as a specific choice of a previously proposed, more general and operationally useful construction called a quasilocal frame -- that is, a choice of a two-parameter...
Paulina Corona Ugalde
(University of Waterloo)
14/06/2016, 14:15
Theoretical Physics / Physique théorique (DTP-DPT)
Oral (Student, In Competition) / Orale (Étudiant(e), inscrit à la compétition)
We study the different scenarios that repeated quantum interactions between a system S and an ancillary system Sm induces on the former. These latter systems play the role of measurement devices, or meters. Distinct dynamics emerge depending on various limits that can be taken for the ancillae.
Of special interest is the case where induced effective interactions between subsystems of a...
Éric Dupuis
(Université de Montréal)
14/06/2016, 14:30
Theoretical Physics / Physique théorique (DTP-DPT)
Oral (Student, In Competition) / Orale (Étudiant(e), inscrit à la compétition)
We consider the decay of vortices trapped in a $U(1)$-breaking false vacuum of a Einstein-Hilbert-Higgs theory in $2 + 1$ dimensions. In the true vacuum, the $U(1)$ symmetry is unbroken. The potential of the model allows the formation of metastable vortex solutions. These vortices contain the true vacuum inside in addition to a unit of magnetic flux and the appropriate topologically...
