How to Inflate a Universe ft. Simran Nerval
QUO Fast Radio Bursts
English - August 23, 2021 14:00 - 1 hour - 48.4 MBAstronomy Science Education Homepage Download Apple Podcasts Google Podcasts Overcast Castro Pocket Casts RSS feed
Previous Episode: Future Missions E5: Eyes on Dragonfly
Next Episode: Dangerous Universe E1: Earth Extermination
Introduction:
Simran Nerval recently received her Masters Degree at Queen's UniversityShe is very active in science outreach as a coordinator for Let's Talk Science, GEMINI-P, and the IDEAS initiative. She has given several public talks including one for the Queen's Observatory, Astronomy on Tap, and the Sunshine Coast Astronomy ClubShe studies observational signatures of cosmic inflationCosmic inflation is a hypothesized early stage in the universe where it would have expanded very rapidly and smoothed out the energy in the universe Some versions of inflation could create gravitational waves which we would still see today, kind of like how the static on an old TV is partly from the big bang!Understanding Inflation:
Today we can observe the Cosmic Microwave Background and see that the universe is very smooth, but that shouldn't be possible. Light isn't fast enough for opposite sides of the universe to reach a common temperature, density, etc.Inflation solves this problem by suggesting an initially small patch of the universe could have been stretched out to mostly the size we see now. Thus smoothing out differences across the visible universe.The "Inflaton" is a hypothetical particle that allows cosmologists to write out the math of what could have happened to cause inflation.When the Inflaton is first created it would have a "potential" that it could fall into, releasing energy along the way (kind of like how a ball on top of a hill has potential).Simran studies two possible models for the potential, the E and T models (changing how the ball rolls down the hill).She found that these models could produce observable gravitational wave signatures.New experiments are needed to detect these gravitational waves though.
A Cosmic Big Picture:
Links to Science Outreach Material:
McDonald InstituteRoyal Astronomical SocietyAstronomy on Tap
Special thanks to Colin Vendromin for the music, also thanks to Zac Kenny for the logo!