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/

Episoder(416)

92 | Kevin Hand on Life Elsewhere in the Solar System

92 | Kevin Hand on Life Elsewhere in the Solar System

It's hard doing science when you only have one data point, especially when that data point is subject to an enormous selection bias. That's the situation faced by people studying the nature and preval...

13 Apr 20201h 56min

91 | Scott Barry Kaufman on the Psychology of Transcendence

91 | Scott Barry Kaufman on the Psychology of Transcendence

If one of the ambitious goals of philosophy is to determine the meaning of life, one of the ambitious goals of psychology is to tell us how to achieve it. An influential work in this direction was Abr...

6 Apr 20201h 19min

90 | David Kaiser on Science, Money, and Power

90 | David Kaiser on Science, Money, and Power

Science costs money. And for a brief, glorious period between the start of the Manhattan Project in 1939 and the cancellation of the Superconducting Super Collider in 1993, physics was awash in it, la...

30 Mar 20201h 34min

89 | Lera Boroditsky on Language, Thought, Space, and Time

89 | Lera Boroditsky on Language, Thought, Space, and Time

What direction does time point in? None, really, although some people might subconsciously put the past on the left and the future on the right, or the past behind themselves and the future in front, ...

23 Mar 20201h 28min

Tara Smith on Coronavirus, Pandemics, and What We Can Do

Tara Smith on Coronavirus, Pandemics, and What We Can Do

This is a special episode of Mindscape, thrown together quickly. Many thanks to Tara Smith for joining me on short notice. Tara is an epidemiologist, and a great person to talk to about the novel coro...

18 Mar 20201h 20min

88 | Neil Shubin on Evolution, Genes, and Dramatic Transitions

88 | Neil Shubin on Evolution, Genes, and Dramatic Transitions

"What good is half a wing?" That's the rhetorical question often asked by people who have trouble accepting Darwin's theory of evolution by natural selection. Of course it's a very answerable question...

16 Mar 20201h 33min

87 | Karl Friston on Brains, Predictions, and Free Energy

87 | Karl Friston on Brains, Predictions, and Free Energy

If you tell me that one of the world's leading neuroscientists has developed a theory of how the brain works that also has implications for the origin and nature of life more broadly, and uses concept...

9 Mar 20201h 29min

86 | Martin Rees on Threats to Humanity, Prospects for Posthumanity, and Life in the Universe

86 | Martin Rees on Threats to Humanity, Prospects for Posthumanity, and Life in the Universe

Anyone who has read histories of the Cold War, including the Cuban Missile Crisis and the 1983 nuclear false alarm, must be struck by how incredibly close humanity has come to wreaking incredible dest...

2 Mar 20201h 40min

Populært innen Vitenskap

fastlegen
rekommandert
tingenes-tilstand
jss
rss-rekommandert
liberal-halvtime
villmarksliv
rss-paradigmepodden
forskningno
sinnsyn
fjellsportpodden
pod-britannia
rss-nysgjerrige-norge
tidlose-historier
hva-er-greia-med
rss-lundqvist-podden
dekodet-2
tomprat-med-gunnar-tjomlid
vett-og-vitenskap-med-gaute-einevoll
nordnorsk-historie