ABOUT THE FQXi PODCAST

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 podcast@fqxi.org, and follow us on twitter: @FQXi. The podcast is produced by Zeeya, and music is provided by Baltimore-based Diefenbaker.

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 podcast@fqxi.org, and follow us on twitter: @FQXi. The podcast is produced by Zeeya, and music is provided by Baltimore-based Diefenbaker.

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RECENT ARTICLES

*click titles to read articles*

**First Things First: The Physics of Causality**

Why do we remember the past and not the future? Untangling the connections between cause and effect, choice, and entropy.

**Can Time Be Saved From Physics?**

Philosophers, physicists and neuroscientists discuss how our sense of time’s flow might arise through our interactions with external stimuli—despite suggestions from Einstein's relativity that our perception of the passage of time is an illusion.

**Thermo-Demonics**

A devilish new framework of thermodynamics that focuses on how we observe information could help illuminate our understanding of probability and rewrite quantum theory.

**Gravity's Residue**

An unusual approach to unifying the laws of physics could solve Hawking's black-hole information paradox—and its predicted gravitational "memory effect" could be picked up by LIGO.

**Could Mind Forge the Universe?**

Objective reality, and the laws of physics themselves, emerge from our observations, according to a new framework that turns what we think of as fundamental on its head.

RECENT ARTICLES

Why do we remember the past and not the future? Untangling the connections between cause and effect, choice, and entropy.

Philosophers, physicists and neuroscientists discuss how our sense of time’s flow might arise through our interactions with external stimuli—despite suggestions from Einstein's relativity that our perception of the passage of time is an illusion.

A devilish new framework of thermodynamics that focuses on how we observe information could help illuminate our understanding of probability and rewrite quantum theory.

An unusual approach to unifying the laws of physics could solve Hawking's black-hole information paradox—and its predicted gravitational "memory effect" could be picked up by LIGO.

Objective reality, and the laws of physics themselves, emerge from our observations, according to a new framework that turns what we think of as fundamental on its head.

PODCAST

January 22, 2020

Complete Podcast

The FQXi **December 24, 2019** Podcast features:

- Schrödinger Squared

INFO: **MP3 file / 57 minutes / 60 MB**

LISTEN:

Featured video in this podcast:

Individual Stories

Schrödinger Squared

An amped up version of the Schrodinger Cat Paradox spells trouble for all quantum interpretations -- according to its architect Renato Renner. He tells Zeeya and Brendan how the controversial thought experiment works, and why he thinks it is bad news for fans of Many Worlds and quantum parallel universes, QBism, Collapse models and (less so) for Bohmian interpretations of quantum mechanics. But not everyone agrees.

INFO: **MP3 file / 57 minutes / 60 MB**

LISTEN:

RELATED LINKS:

*Nature Communications:*Paper by Frauchiger and Renner*FQXi blog:*Watching the Watchmen--George Musser implements a quantum circuit to test the Frauchiger-Renner paradox*FQXi video:*Modelling Physical Agents with a Quantum Computer, by Lidia del Rio*Nature News:*Reimagining of Schrödinger Cat Breaks Physics

PODCAST ARCHIVE

- 2019: Year in Physics Review Part 2

- 2019: Year in Physics Review Part 1

- Quantum Supremacy Milestone?

- Quantum Mind Reading -- Adam Brown

- Downward Causation -- George Ellis

- Designing the Mind -- Susan Schneider

- Measuring Free Will -- Ian Durham

- How Do We Make Decisions? -- Carlo Rovelli

- Building an AI Physicist -- Max Tegmark

- Future of Computation -- Fred Adams

- Memory, Causality and Cats -- Sean Carroll

View All Archived Podcasts

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JOHN R. COX wrote on January 13, 2020

George,

We shouldn't conflate contradiction with inconsistency. QM has a dynamic track record not only of prediction in application to specific tasks, but also in discovery. Its worth noting that where we have seen discovery in QM it has been by theoretical regimes which are quasi-Relativistic, ie: inverse square law subject to Lorentz Invariance.

The question posed by Frauchiger and Renner, does contend inconsistency. But all the underpinning of QM parameters are classical laws...

George,

We shouldn't conflate contradiction with inconsistency. QM has a dynamic track record not only of prediction in application to specific tasks, but also in discovery. Its worth noting that where we have seen discovery in QM it has been by theoretical regimes which are quasi-Relativistic, ie: inverse square law subject to Lorentz Invariance.

The question posed by Frauchiger and Renner, does contend inconsistency. But all the underpinning of QM parameters are classical laws...

JOHN R. COX wrote on January 13, 2020

Georgi,

by and large I agree. Near the end of the discussion panel, Aaronson summed it as what is proven is that we can prove QM is a theory. The 'why' that it works is omething that goes to vast numbers of events in the simplest macroscopic thing. A mature Maple tree in my neighborhood might produce 30,000 leaves in a season, yet there is still a small area way up in the wind where a few, scattered, dead leaves cling to their twigs in January. What are the odds of that, and what odds of...

Georgi,

by and large I agree. Near the end of the discussion panel, Aaronson summed it as what is proven is that we can prove QM is a theory. The 'why' that it works is omething that goes to vast numbers of events in the simplest macroscopic thing. A mature Maple tree in my neighborhood might produce 30,000 leaves in a season, yet there is still a small area way up in the wind where a few, scattered, dead leaves cling to their twigs in January. What are the odds of that, and what odds of...

GEORGINA WOODWARD wrote on January 13, 2020

Thanks for taking the time John. By 'relying on what they are sent' I mean what I think you are referring to as the 'classical record'.

Right now I'm thinking you can't make silk purse out of a sows ear. It starts out with quantum correlations and uses quantum maths and quantum explanations and ends up with something unexpected. I'm not sure if it is a true paradox, an*impossibility* (most likely indicating something wrong with the theory) or just what you get if you follow the...

Thanks for taking the time John. By 'relying on what they are sent' I mean what I think you are referring to as the 'classical record'.

Right now I'm thinking you can't make silk purse out of a sows ear. It starts out with quantum correlations and uses quantum maths and quantum explanations and ends up with something unexpected. I'm not sure if it is a true paradox, an

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