Quantum Gravity, the AdS/CFT Correspondence, and Self-Dual Spacetimes
Quantum gravity represents the efforts of several fields in physics to find a unified description of gravity that operates on all scales. The Anti-de Sitter space/conformal field theory (AdS/CFT) correspondence, or gauge/gravity duality, is the observation that some mappings exist between quantum field theories to specific descriptions of gravity under general relativity. In an endeavour to better understand these dualities metrics from M-theory are derived. These metrics describe a spacetime which can be examined to understand how that quantum representation of gravity behaves under Einstein’s field equations. Self-dual metrics are of particular interest as they represent these dualities in concise mathematical terms. This enables us to examine the associated gravitational models in useful test cases, such as blackholes, where quantum and gravitational physics converge. This talk will go over the concepts of gauge/gravity duality with a focus on self-dual metrics and their importance in establishing the connection between quantum and gravitational theories.
Creating LIFE in the Lab
The Limb Imaging FTS Experiment (LIFE) Version 1 prototype balloon instrument is entering the build phase of the development cycle. LIFE makes use of an interferometer to take limb images of the atmosphere, to which a Fourier transform can be applied, to retrieve spectral information. Spectral information can then be used to determine atmospheric profiles of trace gas species; LIFE aims to obtain ozone, methane, water vapor nitrous oxide profiles. The system as it exists today is set-up in the lab for characterization and calibration purposes. A large amount of time and effort is required to get this design working, and this talk will focus on these tasks which must be completed, with a focus on detector characterization and uniform time sampling and their importance to instrument operation.
The Search for the Substorm Current Wedge: A Comparison of SuperDARN and AMPERE Results
Near-Earth space is a region where the dynamics are best described by the motion of plasmas and the currents that flow there. To understand the chain of events that leads to space weather phenomena, the connections of the interplanetary magnetic field to the magnetosphere to the ionosphere need to be understood. In particular, during night side events called substorms currents flow along Earth’s magnetic field between the magnetosphere and the ionosphere. Incoming and outgoing field-aligned currents are part of the substorm current wedge that connects in the ionosphere and in the magnetosphere. Two scientific tools are used to calculate field-aligned currents: the magnetometers aboard the Iridium satellite constellation in the AMPERE project, and the radar network SuperDARN. A comparison between AMPERE and SuperDARN methods will be given, as well as the results for a superposed epoch analysis and spatial alignment for field-aligned current data of both instruments during substorm times in Earth’s ionosphere.
Please submit applications by e-mail to Chris Pugh at ac.unodnarbnull@chgup.
If you have any further questions, don’t hesitate to contact Chris Pugh at ac.unodnarbnull@chgup.
Chris Pugh, CAP’s representative with the IAPS
Chitra Rangan, CAP’s International Day of Light Coordinator for Canada
Planning on viewing the solar eclipse on Monday? Make sure you’re viewing it safely by making your own pinhole camera!
Title: Measurements and Analysis of Polarization Data from the ePOP-SuperDARN Experiment.
Abstract: The Radio Receiver Instrument (RRI) onboard the enhanced Polar Outﬂow Probe (ePOP) consists of four 3-metre monopoles in an orthogonal dipole conﬁguration used for observing the polarization of incoming High Frequency (HF) radio wave signals. Propagation of a wave through a ionized medium with an external magnetic field has notable effects on its polarization state through what is known as the Appleton-Hartree equation. Through conjunction with ground-sourced HF signals, RRI data leads to observations of structure in the ionosphere. In the framework of this research, the HF radio waves are sourced by the SuperDARN Saskatoon station. Scientific background and current RRI data results will be presented.