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New Light in an Old Universe - Dr. Brian Keating, Cosmologist, UCSD

The DemystifySci Podcast

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What Does the Gravitational Imprints on the Cosmic Microwave Look Like?

When light interacts with matter, it can become polarized. When you have this matter present in the early universe, it's if you have waves of gravity. So we're trying to use the observations of these ancient photons called the microwave background. Their polarization tells us about the last time that that light interacted with matter. That interaction with matter will have a different pattern depending on whether or not the universe has sufficient amounts of gravitational waves.

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