CHIME Telescope

Kendrick Smith Perimeter Institute for Theoretical Physics

Kendick Smith will discuss the CHIME telescope in this talk, which is part of the 2019 International Summer School for Young Physicists.

Why is time always moving forwards and never backwards?

Marina Cortes University of Lisbon

Why is the future different from the past? The most poignant property about the world around us is that time is always moving forward, yet, as odd as it may seem, our current theories of physics cannot account for this property. In all of fundamental physics, the future and the past are entirely similar. We select time increasing solutions by hand and call on extremely unlikely initial conditions at the big bang to justify this choice. I will address this question and describe attempts to restore the irreversibility of time as the building block of our understanding of nature.

Cosmos, the beginnings...

Ghazal Geshnizjani University of Waterloo
Abstract: “How did our universe begin?” is possibly one of the oldest questions that have bewildered humans throughout history. As a theoretical cosmologist, our job is to find a mathematically consistent picture for early universe that could explain observations, from the largest to the smallest scales. The past thirty years have witnessed amazing progress, both in developing technology for precision cosmological observations, and in perfecting mathematical methodology to explain them.

CPT symmetric universe

Latham Boyle Perimeter Institute for Theoretical Physics
Abstract: From astronomical observations, we know that the state of the early universe (just after the Big Bang) was extremely simple. This is surely an important clue about how the universe began, but what exactly is it trying to tell us? I will explain our new answer to this question: we think it is telling us that the universe before the bang is a kind of mirror image of the universe after the bang (they are related by "CPT symmetry"). (Based on recent work with Kieran Finn and Neil Turok: https://arxiv.org/pdf/1803.08928.pdf)

Can Quantum Correlations be Explained Causally?

Robert Spekkens Perimeter Institute for Theoretical Physics

Abstract: There is a strong correlation between the sun rising and the rooster crowing, but to say that the one causes the other is to say more. In particular, it says that making the rooster crow early will not precipitate an early dawn, whereas making the sun rise early (for instance, by moving the rooster eastward) can lead to some early crowing. Intervening upon the natural course of events in this manner is a good way of discovering causal relations. Sometimes, however, we can't intervene, or we'd prefer not to.