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The FQXi podcast brings you the latest ideas in foundational physics and cosmology—and includes interviews with our members and other leading scientists. It's hosted by Zeeya Merali and Brendan Foster. You can contact us at, and follow us on twitter: @FQXi. The podcast is produced by Zeeya, and music is provided by Baltimore-based Diefenbaker.

John Merryman: "The problem is that we do experience reality as those discrete flashes of..." in The Quantum...

Thomas Ray: "(reposted in correct thread) Lorraine, Nah. That's nothing like my view...." in 2015 in Review: New...

Lorraine Ford: "Clearly “law-of-nature” relationships and associated numbers represent..." in Physics of the Observer -...

Lee Bloomquist: "Information Channel. An example from Jon Barwise. At the workshop..." in Physics of the Observer -...

Lee Bloomquist: "Please clarify. I just tried to put a simple model of an observer in the..." in Alternative Models of...

Lee Bloomquist: "Footnote...for the above post, the one with the equation existence =..." in Alternative Models of...

Thomas Ray: "In fact, symmetry is the most pervasive physical principle that exists. ..." in “Spookiness”...

Thomas Ray: "It's easy to get wound around the axle with black hole thermodynamics,..." in “Spookiness”...

click titles to read articles

Why Time Might Not Be an Illusion
Einstein’s relativity pushes physicists towards a picture of the universe as a block, in which the past, present, and future all exist on the same footing; but maybe that shift in thinking has gone too far.

The Complexity Conundrum
Resolving the black hole firewall paradox—by calculating what a real astronaut would compute at the black hole's edge.

Quantum Dream Time
Defining a ‘quantum clock’ and a 'quantum ruler' could help those attempting to unify physics—and solve the mystery of vanishing time.

Our Place in the Multiverse
Calculating the odds that intelligent observers arise in parallel universes—and working out what they might see.

Sounding the Drums to Listen for Gravity’s Effect on Quantum Phenomena
A bench-top experiment could test the notion that gravity breaks delicate quantum superpositions.

March 18, 2018

Complete Podcast
The FQXi May 2, 2016 Podcast features:
  • Gravitational Waves & a MICROSCOPE on Galileo
  • Wrinkles in Spacetime
  • A Quantum Horror Story
INFO: MP3 file / 42 minutes / 41 MB
DOWNLOAD (right-click Windows, control-click Mac)
DISCUSS in the FQXi Community Forum
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Featured video in this podcast:
Individual Stories
Gravitational Waves & a MICROSCOPE on Galileo
In the news: the MICROSCOPE experiment launches to test the equivalence principle, as Zeeya and Brendan discuss. And a special report on how the detection of gravitational waves will enable physicists to probe quantum gravity and neutron stars. LIGO physicist Alessandra Buonanno and quantum gravity expert Ted Jacobson talk to Brendan Foster.
INFO: MP3 file / 17 minutes / 16 MB
DOWNLOAD (right-click Windows, control-click Mac)
Wrinkles in Spacetime
Physicist Sabine Hossenfelder describes her search for defects in spacetime, which could help home in on a theory of quantum gravity, to reporter Colin Stuart.
INFO: MP3 file / 8 minutes / 8 MB
DOWNLOAD (right-click Windows, control-click Mac)
A Quantum Horror Story
Are you scared of the monster under the bed? Author Liam Hogan reads his spooky award-winning short story, Ana, and chats about his background in physics and his writing to Zeeya Merali.
INFO: MP3 file / 17 minutes / 17 MB
DOWNLOAD (right-click Windows, control-click Mac)
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Recent Comments

End of Spacetime, End of Einstein

Nobel Laureate David Gross observed, "Everyone in string theory is convinced...that spacetime is doomed. But we don't know what it's replaced by."

Nima Arkani-Hamed (06:09): "Almost all of us believe that space-time doesn't really exist, space-time is doomed and has to be replaced by some more primitive building blocks."

What scientific idea is ready for retirement? Steve Giddings: "Spacetime. Physics has always been regarded as playing...

U have so interesting discussions!

Clifford Will: "I must say that when they found the waves, proving Einstein right, I thought it came from an unexpected source (the black holes). I thought it would be neutron stars."

Faking black hole gravitational waves is safe (nobody can expose the fraud) but faking neutron star gravitational waves is dangerous:

"Models predict that the merging of two stellar-mass black holes would not produce light at any wavelength, but if one or two neutron stars were involved in the...

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