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)

257 | Derek Guy on the Theory and Practice of Dressing Well

257 | Derek Guy on the Theory and Practice of Dressing Well

Putting on clothes is one of the most universal human experiences. Inevitably, this involves choices; maybe you just grab the cheapest and most convenient clothing available, or maybe you want to fit ...

20 Marras 20231h 20min

256 | Kelly and Zach Weinersmith on Building Cities on the Moon and Mars

256 | Kelly and Zach Weinersmith on Building Cities on the Moon and Mars

There is an undeniable romance in the idea of traveling to, and even living in, outer space. In recent years, a pragmatic justification has become increasingly popular: the Earth is vulnerable to thre...

13 Marras 20231h 24min

AMA | November 2023

AMA | November 2023

Welcome to the November 2023 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 Pa...

6 Marras 20234h 20min

255 | Michael Muthukrishna on Developing a Theory of Everyone

255 | Michael Muthukrishna on Developing a Theory of Everyone

A "Theory of Everything" is physicists' somewhat tongue-in-cheek phrase for a hypothetical model of all the fundamental physical interactions. Of course, even if we had such a theory, it would tell us...

30 Loka 20231h 17min

254 | William Egginton on Kant, Heisenberg, and Borges

254 | William Egginton on Kant, Heisenberg, and Borges

It can be tempting, when first introduced to a deep concept of physics like Heisenberg's uncertainty principle, to draw grand philosophical conclusions about the impossibility of knowing anything prec...

23 Loka 20231h 6min

253 | David Deutsch on Science, Complexity, and Explanation

253 | David Deutsch on Science, Complexity, and Explanation

David Deutsch is one of the most creative scientific thinkers working today, who has as a goal to understand and explain the natural world as best we can. He was a pioneer in quantum computing, and ha...

16 Loka 20231h 42min

AMA | October 2023

AMA | October 2023

Welcome to the October 2023 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 Pat...

9 Loka 20232h 58min

252 | Hannah Ritchie on Keeping Hope for the Planet Alive

252 | Hannah Ritchie on Keeping Hope for the Planet Alive

Our planet and its environment are in bad shape, in all sorts of ways. Those of us who want to improve the situation face a dilemma. On the one hand, we have to be forceful and clear-headed about how ...

2 Loka 20231h 15min

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