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)

193 | Daniels on Everything, Everywhere, All at Once

193 | Daniels on Everything, Everywhere, All at Once

Every time we make an important decision, it's hard not to wonder how things would have turned out had we chosen differently. The set of all those hypothetical lives is a kind of "multiverse" — not on...

18 Huhti 20221h 8min

AMA | April 2022

AMA | April 2022

Welcome to the April 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 quest...

14 Huhti 20223h 27min

192 | Nicole Yunger Halpern on Quantum Steampunk Thermodynamics

192 | Nicole Yunger Halpern on Quantum Steampunk Thermodynamics

Randomness and probability are central to modern physics. In statistical mechanics this is because we don't know everything about the distribution of atoms and molecules in a fluid, so we consider a p...

11 Huhti 20221h 17min

191 | Jane McGonigal on How to Imagine the Future

191 | Jane McGonigal on How to Imagine the Future

The future grows out of the present, but it manages to consistently surprise us. How can we get better at anticipating and preparing for what the future can be like? Jane McGonigal started out as a ga...

4 Huhti 20221h 21min

190 | Lea Goentoro on Regrowing Limbs

190 | Lea Goentoro on Regrowing Limbs

Biological organisms are pretty good at healing themselves, but their abilities fall short in crucial ways. Planaria can be cut into pieces, and each piece will regrow into an entire organism; but for...

28 Maalis 20221h 3min

189 | Brian Klaas on Power and the Temptation of Corruption

189 | Brian Klaas on Power and the Temptation of Corruption

All societies grant more power to some citizens, and there is always a temptation to use that power for the benefit of themselves rather than for the greater good. Power corrupts, we are told — but to...

21 Maalis 20221h 22min

AMA | March 2022

AMA | March 2022

Welcome to the March 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 quest...

17 Maalis 20223h 18min

188 | Arik Kershenbaum on What Aliens Will Be Like

188 | Arik Kershenbaum on What Aliens Will Be Like

If extraterrestrial life is out there — not just microbial slime, but big, complex, macroscopic organisms — what will they be like? Movies have trained us to think that they won't be that different at...

14 Maalis 20221h 21min

Suosittua kategoriassa Tiede

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