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.

RECENT FORUM POSTS

**Georgina Woodward**: "Re. my "Arms affected by mechanical forces..." There is the force at the..."
*in* Bonus Koan: Distant...

**Joe Fisher**: "Dear Dr. Kuhn, Today’s Closer To Truth Facebook page contained this..."
*in* First Things First: The...

**Steve Dufourny**: "Lie groups, there are SU(N),SO(N),Sp(N), and the exceptional G_2, F_4, E_6,..."
*in* Measuring Free Will: Ian...

**Steve Agnew**: "There might indeed be a way to measure free will just like there is a way..."
*in* Measuring Free Will: Ian...

**Robert McEachern**: "Real measurements of what? Bell's theorem is a mathematical theorem, not a..."
*in* The Physics of...

**Lorraine Ford**: "People like Susan Schneider and Max Tegmark are barking up the wrong tree. ..."
*in* Designing the Mind: Susan...

**Georgina Woodward**: "I've tried to show that the spinning motion is not absolute (as the term is..."
*in* Bonus Koan: Distant...

**Steve Agnew**: "Here is a nice slide from Gu's talk that shows the superposition of..."
*in* Memory, Causality and...

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

August 20, 2019

Complete Podcast

The FQXi **August 12, 2019** Podcast features:

- How Do We Make Decisions? -- Carlo Rovelli

INFO: **MP3 file / 36 minutes / 60 MB**

LISTEN:

Individual Stories

How Do We Make Decisions? -- Carlo Rovelli

The science behind choice. Physicist Carlo Rovelli investigates the link between agency, time's arrow, and thermodynamics. From the 6th FQXi meeting, in Tuscany.

INFO: **MP3 file / 37 minutes / 60 MB**

LISTEN:

RELATED LINKS:

*FQXi article:*First Things First: The Physics of Causality*FQXi essay contest:*Meaning and Intentionality = Information + Evolution , by Carlo Rovelli

PODCAST ARCHIVE

- Downward Causation -- George Ellis

- Designing the Mind -- Susan Schneider

- Measuring Free Will -- Ian Durham

- Building an AI Physicist -- Max Tegmark

- Future of Computation -- Fred Adams

- Memory, Causality and Cats -- Sean Carroll

- 2018: Year in Physics Part 2

- 2018: Year in Physics Review Part 1

- Superhuman

- Neutrino Mysteries
- Fuzzballs Solve Black Hole Paradox
- Almost Quantum
- Testing Free Will with AI

- Losing the Nobel Prize

View All Archived Podcasts

Comment on this Podcast

Please read the important Introduction that governs your participation in this community. Inappropriate language will not be tolerated and posts containing such language will be deleted. Otherwise, this is a free speech Forum and all are welcome!

Please enter the text of your post, then click the "Submit New Post" button below. You may also optionally add file attachments below before submitting your edits.

HTML tags are not permitted in posts, and will automatically be stripped out. Links to other web sites are permitted. For instructions on how to add links, please read the link help page.

You may use superscript (10

^{100}) and subscript (A_{2}) using [sup]...[/sup] and [sub]...[/sub] tags.You may use bold (

**important**) and italics (*emphasize*) using [b]...[/b] and [i]...[/i] tags.You may also include LateX equations into your post.

Insert LaTeX Equation
[hide]

LaTeX equations may be displayed in FQXi Forum posts by including them within [equation]...[/equation] tags. You may type your equation directly into your post, or use the LaTeX Equation Preview feature below to see how your equation will render (this is recommended).

For more help on LaTeX, please see the LaTeX Project Home Page.

LaTeX Equation Preview

preview equation

clear equation

insert equation into post at cursor

LaTeX equations may be displayed in FQXi Forum posts by including them within [equation]...[/equation] tags. You may type your equation directly into your post, or use the LaTeX Equation Preview feature below to see how your equation will render (this is recommended).

For more help on LaTeX, please see the LaTeX Project Home Page.

LaTeX Equation Preview

preview equation

clear equation

insert equation into post at cursor

Attachments
[hide]

You may optionally attach up to two documents to your post. To add an attachment, use the following feature to browse your computer and select the file to attach. The maximum file size for attachments is 1MB.

Once you're done adding file attachments, click the "Submit New Post" button to add your post.

You may optionally attach up to two documents to your post. To add an attachment, use the following feature to browse your computer and select the file to attach. The maximum file size for attachments is 1MB.

Once you're done adding file attachments, click the "Submit New Post" button to add your post.

ROBERT H MCEACHERN wrote on August 19, 2019

Real measurements of what? Bell's theorem is a mathematical theorem, not a physical theory; it demands that "measurements" be made on mathematically-identical pairs of particles. But there is no evidence that such idealized things "really" exist, in the "real" world. Hence, none are likely to ever be measured. Indeed, the "real" measurements, made in "real" Bell tests, amount to nothing more than a "reduction to an absurdity" demonstration of the falsity of the theorem's identical-particle...

Real measurements of what? Bell's theorem is a mathematical theorem, not a physical theory; it demands that "measurements" be made on mathematically-identical pairs of particles. But there is no evidence that such idealized things "really" exist, in the "real" world. Hence, none are likely to ever be measured. Indeed, the "real" measurements, made in "real" Bell tests, amount to nothing more than a "reduction to an absurdity" demonstration of the falsity of the theorem's identical-particle...

STEVE AGNEW wrote on August 18, 2019

I like how stubbornly you stick to your argument...but you should at least do a real measurement to show your point and not calculate a set of measurements with some assumed Shannon error. At least then we would be arguing about measurements and not about calculated measurements...

I like how stubbornly you stick to your argument...but you should at least do a real measurement to show your point and not calculate a set of measurements with some assumed Shannon error. At least then we would be arguing about measurements and not about calculated measurements...

ROBERT H MCEACHERN wrote on August 18, 2019

In a very perverse sort of way, you are correct that quantum phase noise matters: For example, many of the "measurements" performed in Bell-tests yield the completely wrong result - declaring the measured entity to be "up" when it was actually "down" etc. This has been demonstrated to happen, due to the combination of having the detector's "phase angle" being misaligned with that of the "phase angle" of the entity being measured, and the noise intrinsic to that entity.

It has also been...

In a very perverse sort of way, you are correct that quantum phase noise matters: For example, many of the "measurements" performed in Bell-tests yield the completely wrong result - declaring the measured entity to be "up" when it was actually "down" etc. This has been demonstrated to happen, due to the combination of having the detector's "phase angle" being misaligned with that of the "phase angle" of the entity being measured, and the noise intrinsic to that entity.

It has also been...

read all podcast comments