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/

Denne episoden er hentet fra en åpen RSS-feed og er ikke publisert av Podme. Den kan derfor inneholde annonser.

Episoder(427)

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 Mar 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 Mar 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 Mar 20221h 21min

187 | Andrew Leigh on the Politics of Looming Disasters

187 | Andrew Leigh on the Politics of Looming Disasters

We're pretty well-calibrated when it comes to dealing with common, everyday-level setbacks. But our brains aren't naturally equipped for dealing with unlikely but world-catastrophic disasters. Yet suc...

7 Mar 20221h 20min

186 | Sherry Turkle on How Technology Affects Our Humanity

186 | Sherry Turkle on How Technology Affects Our Humanity

Advances in technology have gradually been extending the human self beyond its biological extent, as we augment who we are with a variety of interconnected devices. There are obvious benefits to this ...

28 Feb 20221h 11min

185 | Arvid Ågren on the Gene's-Eye View of Evolution

185 | Arvid Ågren on the Gene's-Eye View of Evolution

One of the brilliant achievements of Darwin's theory of natural selection was to help explain apparently "purposeful" or "designed" aspects of biology in a purely mechanistic theory of unguided evolut...

21 Feb 20221h 25min

184 | Gary Marcus on Artificial Intelligence and Common Sense

184 | Gary Marcus on Artificial Intelligence and Common Sense

Artificial intelligence is everywhere around us. Deep-learning algorithms are used to classify images, suggest songs to us, and even to drive cars. But the quest to build truly "human" artificial inte...

14 Feb 20221h 24min

AMA | February 2022

AMA | February 2022

Welcome to the February 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 qu...

10 Feb 20224h 15min

Populært innen Vitenskap

fastlegen
tingenes-tilstand
forskningno
rekommandert
sinnsyn
villmarksliv
jss
rss-nysgjerrige-norge
liberal-halvtime
dekodet-2
rss-paradigmepodden
rss-zahid-ali-hjelper-deg
nordnorsk-historie
tomprat-med-gunnar-tjomlid
kvinnehelsepodden
tidlose-historier
rss-rekommandert
rss-inn-til-kjernen-med-sunniva-rose
fjellsportpodden
rss-overskuddsliv