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/

Tämä jakso on lisätty Podme-palveluun avoimen RSS-syötteen kautta eikä se ole Podmen omaa tuotantoa. Siksi jakso saattaa sisältää mainontaa.

Jaksot(427)

177 | Monika Schleier-Smith on Cold Atoms and Emergent Spacetime

177 | Monika Schleier-Smith on Cold Atoms and Emergent Spacetime

When it comes to thinking about quantum mechanics, there are levels. One level is shut-up-and-calculate: find a wave function, square it to get a probability. One level is foundational: dig deeply int...

13 Joulu 20211h 10min

176 | Joshua Greene on Morality, Psychology, and Trolley Problems

176 | Joshua Greene on Morality, Psychology, and Trolley Problems

We all know you can't derive "ought" from "is." But it's equally clear that "is" — how the world actual works — is going to matter for "ought" — our moral choices in the world. And an important part o...

6 Joulu 20211h 26min

175 | William Ratcliff on Multicellularity, Physics, and Evolution

175 | William Ratcliff on Multicellularity, Physics, and Evolution

We've talked about the very origin of life, but certain transitions along its subsequent history were incredibly important. Perhaps none more so than the transition from unicellular to multicellular o...

29 Marras 20211h 26min

174 | Tai-Danae Bradley on Algebra, Topology, Language, and Entropy

174 | Tai-Danae Bradley on Algebra, Topology, Language, and Entropy

Mathematics is often thought of as the pinnacle of crisp precision: the square of the hypotenuse of a right triangle isn't "roughly" the sum of the squares of the other two sides, it's exactly that. B...

22 Marras 20211h 21min

AMA | November 2021

AMA | November 2021

Welcome to the November 2021 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 qu...

17 Marras 20213h 54min

173 | Sylvia Earle on the Oceans, the Planet, and People

173 | Sylvia Earle on the Oceans, the Planet, and People

It's a well-worn cliché that oceans cover seventy percent of the surface of Earth, but we tend to give them secondary consideration when thinking about the environment. But climate change is wreaking ...

15 Marras 20211h 11min

172 | David Goyer on Televising the Fall of the Galactic Empire

172 | David Goyer on Televising the Fall of the Galactic Empire

Science and storytelling have a long and tumultuous relationship. Scientists sometimes want stories to be just an advertisement for how awesome science is; storytellers sometimes want to use science f...

8 Marras 20211h 16min

171 | Christopher Mims on Our Interconnected Industrial Ecology

171 | Christopher Mims on Our Interconnected Industrial Ecology

As the holidays approach, we are being reminded of the fragility of the global supply chain. But at the same time, the supply chain itself is a truly impressive and fascinating structure, made as it i...

1 Marras 20211h 27min

Suosittua kategoriassa Tiede

rss-mita-tulisi-tietaa
rss-poliisin-mieli
tiedekulma-podcast
utelias-mieli
docemilia
rss-duodecim-lehti
rss-tiedetta-vai-tarinaa
rss-totuuden-liepeilla
university-of-eastern-finland
filocast-filosofian-perusteet
rss-duokkari-ekstra
rss-laakaripodi
rss-ylistys-elaimille
rss-lapsuuden-rakentajat-podcast