Holiday Message 2020 | The Screwy Universe

Holiday Message 2020 | The Screwy Universe

Welcome to the third annual Mindscape Holiday Message! Just a chance for me to be a little more chatty and informal than usual, although as it turned out this isn't all that different from a conventional solo episode. With the difference that what I'm talking about — a phenomenon called "cosmic birefringence" — has played a big part in my personal scientific career, so I get to be a bit autobiographical.

Every photon has a direction of polarization, which generally remains fixed as the photon travels through space. Birefringence is an effect by which the polarization rotates rather than staying fixed. It can happen in materials, but generally not in outer space. But there are exotic physics ideas that could cause such a rotation, including the dynamical dark energy candidate known as quintessence. People have put limits on such cosmic birefringence for a while now, but recently there was a claim that there might be a nonzero amount of birefringence visible in the polarization of the cosmic microwave background! Still very tentative, but if this hint turns into real evidence, it would big extremely big news for our understanding of physics and cosmology, possibly helping us pinpoint the nature of dark energy.

Show notes, links, transcript: https://www.preposterousuniverse.com/podcast/2020/12/21/holiday-message-2020-the-screwy-universe/

Jaksot(416)

AMA | August 2022

AMA | August 2022

Welcome to the August 2022 Ask Me Anything episode of Mindscape! These monthly excursions are funded by Patreon supporters (who are also the ones asking the questions). We take questions asked by Patr...

1 Elo 20223h 6min

205 | John Quiggin on Interest Rates and the Information Economy

205 | John Quiggin on Interest Rates and the Information Economy

The idea of an "interest rate" might seem mundane and practical, in comparison to our usual topics around here, but there is a profound philosophical idea lurking in the background: if you lend me mon...

25 Heinä 20221h 19min

204 | John Asher Johnson on Hunting for Exoplanets

204 | John Asher Johnson on Hunting for Exoplanets

Recent years have seen a revolution in the study of exoplanets, planets that orbit stars other than the Sun (or don't orbit stars at all). After a few tentative detections in the 1990s, dedicated inst...

18 Heinä 20221h 15min

203 | N.J. Enfield on Why Language is Good for Lawyers and Not Scientists

203 | N.J. Enfield on Why Language is Good for Lawyers and Not Scientists

We describe the world using language — we can't help it. And we all know that ordinary language is an imperfect way of communicating rigorous scientific statements, but sometimes it's the best we can ...

11 Heinä 20221h 24min

AMA | July 2022

AMA | July 2022

Welcome to the July 2022 Ask Me Anything episode of Mindscape! These monthly excursions are funded by Patreon supporters (who are also the ones asking the questions). I take the large number of questi...

4 Heinä 20223h 26min

202 | Andrew Papachristos on the Network Theory of Gun Violence

202 | Andrew Papachristos on the Network Theory of Gun Violence

The United States is suffering from an epidemic of tragic gun violence. While a political debate rages around the topic of gun control, it remains important to understand the causes and possible remed...

27 Kesä 20221h 15min

201 | Ed Yong on How Animals Sense the World

201 | Ed Yong on How Animals Sense the World

All of us construct models of the world, and update them on the basis of evidence brought to us by our senses. Scientists try to be more rigorous about it, but we all do it. It's natural that this pro...

20 Kesä 20221h 9min

AMA | June 2022

AMA | June 2022

Welcome to the June 2022 Ask Me Anything episode of Mindscape! We are inaugurating a slightly different publication schedule, in which these monthly AMA will take the place of one of the regular Monda...

13 Kesä 20223h 4min

Suosittua kategoriassa Tiede

rss-mita-tulisi-tietaa
rss-poliisin-mieli
tiedekulma-podcast
utelias-mieli
rss-luontopodi-samuel-glassar-tutkii-luonnon-ihmeita
rss-duodecim-lehti
docemilia
radio-antro
filocast-filosofian-perusteet
rss-tervetta-skeptisyytta