2018 CAP Congress / Congrès de l'ACP 2018

Session

T3-4 Gravity and Cosmology (DTP/DHP) | Gravité et cosmologie (DPT/DHP)

T3-4

12 Jun 2018, 13:30

Dalhousie University

Conveners

T3-4 Gravity and Cosmology (DTP/DHP) | Gravité et cosmologie (DPT/DHP)

• Valerio Faraoni (Bishop's University)

1950. What we have learned from the Cosmic Microwave Background (I)

Prof. Mark Halpern (UBC)

12/06/2018, 13:30

Theoretical Physics / Physique théorique (DTP-DPT)

Invited Speaker / Conférencier(ère) invité(e)

It is now 100 years since Planck received a Nobel Prize for describing blackbody radiation. It is 75 years since McKellar found a background temperature of molecules in space and 55 years from the recognized discovery of the cosmic microwave background. Measurements of the spectrum, and the the anisotropy of the intensity and polarization patterns of the CMB have told us about thermal...

1958. The CMB and the early universe (I)

Prof. Edward Wilson-Ewing (University of New Brunswick)

12/06/2018, 14:00

Theoretical Physics / Physique théorique (DTP-DPT)

Invited Speaker / Conférencier(ère) invité(e)

I will explain how observations of the cosmic microwave background constrain theories of the early universe. I will then present some cosmological models whose predictions are in agreement with current observations, and explain how future observations may be able to differentiate between these models.

2120. Bianchi IX dynamics in dust time (G)

Masooma Ali (University of New Brunswick)

12/06/2018, 14:30

Theoretical Physics / Physique théorique (DTP-DPT)

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

It is well established that the near singularity dynamics of a Bianchi IX spacetime can be characterized as a series of transitions between Kasner solutions (BKL map). The majority of results obtained in this limit rely on an (intrinsic) geometric time variable (f(g)). This time variable is not suitable to determine the intermediate regime dynamics of Bianchi IX with matter. We study Bianchi...

2174. Is there a cosmological constant problem? (G)*

Syed Moeez Hassan (University of New Brunswick)

12/06/2018, 14:45

Theoretical Physics / Physique théorique (DTP-DPT)

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

The cosmological constant problem is described as one of the greatest crises of modern physics. The conventional problem is posed in the framework of quantum fields on a fixed background and their semiclassical backreaction on gravity. In this talk, expanding on a recent proposal, I will argue that this problem does not arise in a fully non-perturbative gravity-matter framework. I will show...