2018 CAP Congress / Congrès de l'ACP 2018

Session

W1-5 Fields and Strings I (DTP) | Champs et cordes I (DPT)

W1-5

13 Jun 2018, 08:00

Dalhousie University

Conveners

W1-5 Fields and Strings I (DTP) | Champs et cordes I (DPT)

• Cliff Burgess (McMaster U/Perimeter Inst.)

2260. A dispersion relation for conformal theories (I)

Prof. Simon Caron-Huot (McGill University)

13/06/2018, 08:00

Theoretical Physics / Physique théorique (DTP-DPT)

Invited Speaker / Conférencier(ère) invité(e)

Dispersion relations, often called Kramers-Kronig relations, exploit analyticity to reconstruct the real part of a scattering amplitude from its imaginary (or absorptive part), which is often easier to measure and or to compute. I will present a generalization which reconstructs complete four-point correlators in any conformal field theory, starting with only very limited information about...

2055. Decay of the false Skyrmions

Prof. Manu Paranjape

13/06/2018, 08:30

Theoretical Physics / Physique théorique (DTP-DPT)

Oral (Non-Student) / Orale (non-étudiant(e))

We consider the decay due to tunnelling of metastable Skyrmions that exist in the false vacuum. The possible mass term for the pions explicitly breaks the chiral symmetry. The only phenomenological constraint on the mass term is that the resultant pion mass be small. This allows for the possibility of local minima of the potential, which could give rise to metastable, so-called false vacuum...

2238. **** Withdrawn *** Entanglement harvesting in Anti-de Sitter space and beyond (G)

Keith Ng (University of Waterloo)

13/06/2018, 08:45

Theoretical Physics / Physique théorique (DTP-DPT)

Oral Competition (Graduate Student) / Compétition orale (Étudiant(e) du 2e ou 3e cycle)

The $AdS_4$ spacetime is of much interest to physicists, because of its relevance to the AdS/CFT duality. Very little is known
about how to extract quantum correlations from the AdS vacuum, a procedure called entanglement harvesting.
Using a new and general theorem, we calculate the entanglement harvested by a pair of Unruh-DeWitt detectors coupled to a conformal scalar vacuum of $AdS_4$, in...

2193. On the Validity of High-Temperature, Quasi-Periodic Solutions in AdS$_4$ (G)*

Brad Cownden (University of Manitoba)

13/06/2018, 09:00

Theoretical Physics / Physique théorique (DTP-DPT)

Oral Competition (Graduate Student) / Compétition orale (Étudiant(e) du 2e ou 3e cycle)

The stability of asymptotically AdS$_{d+1}$ spacetime under arbitrarily small perturbations of a minimally coupled scalar field has been examined via dual lines of inquiry. The first, undertaken by Bizon and Rostworowski in 2011, was concerned with numerical solutions to the fully nonlinear system. This and subsequent work led to the determination that AdS was generically unstable to Gaussian...

2204. Gradient Flow in Holographic Superconductors (G)

Paul Mikula (University of Manitoba)

13/06/2018, 09:15

Theoretical Physics / Physique théorique (DTP-DPT)

Oral (Graduate Student) / Orale (Étudiant(e) du 2e ou 3e cycle)

The AdS/CFT correspondence provides an equivalence between a gravity theory in some bulk anti-deSitter spacetime and a conformal field theory (CFT) in one fewer dimensions on the boundary. A superconductor that can be described by a gravity theory through this correspondence is referred to as a 'holographic superconductor'. Gradient flow equations will evolve any given initial field...

2320. A Geometric Theory of Plant Growth

Prof. David Hobill (University of Calgary)

13/06/2018, 09:30

Theoretical Physics / Physique théorique (DTP-DPT)

Oral (Non-Student) / Orale (non-étudiant(e))

In many cases the leaves and petals of plants form curved two-dimensional surfaces. The development of the curvature of those surfaces (ripples, warps, deformations, etc.) can be described by a time dependent Riemannian geometry. Since many biological and chemical systems evolve according to reaction-diffusion equations, the the geometrical description of growth naturally leads to curvature...