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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.

Steven Andresen: "James I'm on the tablet right now, clumsy to write on so I'll make it..." in Alternative Models of...

James Putnam: "Steven, I neglected to add your name to the beginning of my last message...." in Alternative Models of...

Georgina Woodward: "Hi Pentcho, it is necessary to separate what is happening regardless of..." in 2016: The Physics Year in...

Lorraine Ford: "Re Goals: “There are un-pleasurable, even painful aspects to pursuing..." in FQXi Essay Contest 2016:...

Pentcho Valev: "Georgina, in a gravitational field photons accelerate like ordinary falling..." in 2016: The Physics Year in...

Lorraine Ford: "This is my comment on H Chris Ransford’s essay “Where the Question..." in FQXi Essay Contest 2016:...

micheal le: "thuốc bổ thận là bệnh hiếm gặp ở nam giới, tuy nhiên..." in New Podcast: A MICROSCOPE...

Joe Fisher: "Dear Anonymous, If anybody wishes to know more about me, they are welcome..." in Riding the Rogue Quantum...

click titles to read articles

Painting a QBist Picture of Reality
A radical interpretation of physics makes quantum theory more personal.

The Spacetime Revolutionary
Carlo Rovelli describes how black holes may transition to "white holes," according to loop quantum gravity, a radical rewrite of fundamental physics.

Riding the Rogue Quantum Waves
Could giant sea swells help explain how the macroscopic world emerges from the quantum microworld? (Image credit: MIT News)

Rescuing Reality
A "retrocausal" rewrite of physics, in which influences from the future can affect the past, could solve some quantum quandaries—saving Einstein's view of reality along the way.

Untangling Quantum Causation
Figuring out if A causes B should help to write the rulebook for quantum physics.

January 23, 2017

Complete Podcast
The FQXi December 31, 2016 Podcast features:
  • 2016 Countdown Part 2
INFO: MP3 file / 38 minutes / 36 MB
DOWNLOAD (right-click Windows, control-click Mac)
DISCUSS in the FQXi Community Forum
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Individual Stories
2016 Countdown Part 2
Concluding our list of the top physics breakthroughs of 2016, as chosen by Ian Durham.
INFO: MP3 file / 38 minutes / 36 MB
DOWNLOAD (right-click Windows, control-click Mac)
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Recent Comments

Hi Pentcho, it is necessary to separate what is happening regardless of observation from what is seen, as they are not the same. As the language used is not precise, 'the light' might be referring to the phenomenon occurring unseen in Object reality or the phenomenon that is seen, Image reality. If the observer moves towards the source the EM waves will be received more rapidly, increasing frequency of the seen product generated from the input. Yet the unseen EM waves, still in the environment,...

Georgina, in a gravitational field photons accelerate like ordinary falling bodies, so at least in this sense they are not massless:

"If we accept the principle of equivalence, we must also accept that light falls in a gravitational field with the same acceleration as material bodies."

The postulate that the speed of light is independent of the speed of the source is false but sounds reasonable, insofar as it is valid for all other waves. However, combined with the principle of...

Pentcho, though the speed of the source will affect the spatial distribution of the light as it is being emitted into the environment, it is not imparting extra momentum to the massless photons.

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