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If you are aware of an interesting new academic paper (that has been published in a peer-reviewed journal or has appeared on the arXiv), a conference talk (at an official professional scientific meeting), an external blog post (by a professional scientist) or a news item (in the mainstream news media), which you think might make an interesting topic for an FQXi blog post, then please contact us at with a link to the original source and a sentence about why you think that the work is worthy of discussion. Please note that we receive many such suggestions and while we endeavour to respond to them, we may not be able to reply to all suggestions.

Please also note that we do not accept unsolicited posts and we cannot review, or open new threads for, unsolicited articles or papers. Requests to review or post such materials will not be answered. If you have your own novel physics theory or model, which you would like to post for further discussion among then FQXi community, then please add them directly to the "Alternative Models of Reality" thread, or to the "Alternative Models of Cosmology" thread. Thank you.

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FQXi FORUM: Ultimate Reality
October 7, 2022

The Present State of Physics, Mathematics, and Science
340 posts  •  created by Joe Schindler   •  Sep. 7, 2021 @ 22:24 GMT
"This forum will be an appropriate place to discuss the present state of physics, mathematics, and science, as well as for general discussion tangential to these While the topic of allowed discu..."

A Physical Theory based on Sets, Not Vectors
59 posts  •  created by Joe Schindler   •  Jul. 19, 2021 @ 18:00 GMT
"Thank you to Dr. Gerard Rinkus for suggesting we open a discussion of their recent essay A Physical Theory Based On Sets, Not Abstract: This essay questions what is perhaps the most fundamenta..."

On a contextual model refuting Bell's theorem
172 posts  •  created by Joe Schindler   •  May. 17, 2021 @ 22:53 GMT
"Thank you to Eugen Muchowski for suggesting we open a thread to discuss his recent paper On a contextual model refuting Bell's theorem, which was published in [i]Europhysics Letters[/i] in May Fr..."

Quantum Measurement and The First Droplet in a Cloud Chamber Track
1 post  •  created by Joe Schindler   •  May. 7, 2021 @ 20:36 GMT
"Thank you to Dr. Jonathan Schonfeld for suggesting we open a thread to discuss the recent paper The First Droplet in a Cloud Chamber Track, which was published in [i]Foundations of Physics[/i] in..."

Answering Mermin’s Challenge
241 posts  •  created by Zeeya Merali   •  Sep. 28, 2020 @ 15:08 GMT
"There's a new paper in [i]Scientific Reports[/i] by Mark Stuckey and colleagues showing that the relativity principle responsible for time dilation and length contraction in special relativity is also..."

Global Collaboration
532 posts  •  created by David Sloan   •  May. 4, 2020 @ 16:46 GMT
"Dear FQXi , I love your platform like you know it, I work my theory and have improved a lot here and on arxiv and in the books, it is important for me but not like the Project, international,..."

An algebraic approach to Koopman classical mechanics
62 posts  •  created by Zeeya Merali   •  Feb. 20, 2020 @ 19:32 GMT
"This is a place to discuss the article, "An algebraic approach to Koopman classical mechanics' by Peter Morgan, a physicist at Yale. It proposes a way to unify measurements in classical physics and..."

Mass–Energy Equivalence Extension onto a Superfluid Quantum Vacuum
22 posts  •  created by Zeeya Merali   •  Sep. 25, 2019 @ 16:37 GMT
"Thank you to Amrit Srečko Šorli for alerting us to his recent paper in [i]Nature's[/i] open access journal [i]Scientific Reports[/i] (volume 9, Article number: 11737 Here's the abstract: [i]..."

The Nature of Time
824 posts  •  created by Zeeya Merali   •  Feb. 15, 2019 @ 16:57 GMT
"I'm opening up this thread, following requests from users, as a place to discuss general questions and ideas about the nature of time. Enjoy!"

Quantum Physics, Mini Black Holes, and the Multiverse
3 posts  •  created by Farzad Nekoogar   •  Apr. 13, 2018 @ 20:22 GMT
"Quantum Physics, Mini Black Holes, and the Multiverse Debunking Common Misconceptions in Theoretical Physics"

Physics of the Observer Series
11 posts  •  created by Farzad Nekoogar   •  Feb. 28, 2018 @ 06:07 GMT
"Please visit MVJS physics of the observer series: Physics of the Observer – Cosmology (Panel Discussion): Reliable observers in the multiverse:"

The Multiverse - Part 2 Documentary
16 posts  •  created by Farzad Nekoogar   •  May. 28, 2017 @ 20:15 GMT
"Part 2 of the Multiverse documentary is now released on the The following topics/questions are covered: 1. Does string theory predict the Multiverse..."

Quickfire Quantum Qs
32 posts  •  created by Zeeya Merali   •  Apr. 7, 2017 @ 12:53 GMT
"This is a place to post quick queries about quantum-related issues."

Multiversal Journeys: The Multiverse – Introduction and Misconceptions
3 posts  •  created by Brendan Foster   •  Feb. 3, 2017 @ 21:58 GMT
"Multiversal Journeys is a physics education organization run by FQXi Member Farzad Nekoogar. MVJS recently produced a lesson on the multiverse (supported by an FQXi mini-grant). Please have a look..."

The Race to Replace the Kilogram
85 posts  •  created by Zeeya Merali   •  Jan. 25, 2017 @ 12:29 GMT
"Thanks to Steve Agnew for suggesting that we open a thread based on a new [i]Scientific American[/i] article about the "long-running effort to ditch the decaying, 19th-century artifact that defines..."

Weinberg: Why quantum mechanics might need an overhaul
39 posts  •  created by Zeeya Merali   •  Nov. 6, 2016 @ 18:22 GMT
"Thanks to Steve Agnew for suggesting that we open a forum topic based on a recent interview with Nobel Laureate physicist Steven Weinberg, by Tom Siegfried in [i]Science From the article: [i..."

80 Years of EPR — Ontology and Foundations of Quantum Mechanics
9 posts  •  created by Brendan Foster   •  Jan. 29, 2016 @ 17:22 GMT
"FQXi Member and Philosopher Olimpia Lombardi recently hosted a meeting on Foundations of Quantum Mechanics — Ontological Problems After 80 Years of The website is in Spanish, but even if you don..."

Quantum Coherence = Entanglement
47 posts  •  created by Zeeya Merali   •  Jul. 23, 2015 @ 16:38 GMT
"I'm opening this thread shamefully late, based on recent FQXi funded research by Gerardo Adesso and colleagues, whose work was covered in Phys.Org -- as spotted at the time, by John We will, ..."

Pilot Wave Hydrodynamics
71 posts  •  created by Zeeya Merali   •  Sep. 15, 2014 @ 19:38 GMT
"In a new article for the Annual Review of Fluid Mechanics, John Bush of MIT reviews experimental evidence showing fluid droplets exhibiting quantum-esque features. In particular, walking droplets are..."

Alternative Models of Reality
2400 posts  •  created by Zeeya Merali   •  Aug. 30, 2013 @ 15:28 GMT
"If you have an unconventional, alternative model of reality, then this is the place to discuss it. (This is for contributors who have preliminary ideas and would like feedback, but do not have an..."

Quantum Thermodynamics
8 posts  •  created by Zeeya Merali   •  Jul. 8, 2013 @ 21:24 GMT
"A new paper by FQXi member Vlatko Vedral and colleagues on the thermodynamics of quantum systems has been highlighted in a news story on Thanks to John Merryman for alerting us to The art..."

Quantum Mechanics without time and the measurement problem
9 posts  •  created by Brendan Foster   •  Jun. 12, 2012 @ 19:13 GMT
"FQXi Member T. P. Singh of the Tata Institute in Mumbai, India, kindly provided us with slides from a talk he delivered last summer in Trieste, Italy. The topic was his team's research into Quantum..."

Uncertainty Relations - Fundamental or No?
30 posts  •  created by Brendan Foster   •  Feb. 7, 2011 @ 15:07 GMT
"Will the Uncertainty Relations Survive as Fundamental Pieces in the Future of Physics? by Spiridon DUMITRU In this short text (by direct references to two my recent paper [1, 2] ) we try to ev..."

Classical Spheres, Division Algebras, and the Illusion of Quantum Non-locality:
3068 posts  •  created by Joy Christian   •  Jan. 13, 2011 @ 22:26 GMT
"I wish to mention a recent preprint of mine---this one---which is about the prevalent (but false) belief in “quantum non-locality.” I am, in fact, required to post this link here, because this..."

Limits of mathematics in cosmology
193 posts  •  created by Brendan Foster   •  Jul. 26, 2010 @ 14:33 GMT
"By special request, this forum is opened and dedicated to discussion of the limits or not of mathematics when applied to cosmology."

Understanding, artificial intelligence, and so forth
34 posts  •  created by Ian Durham   •  Mar. 7, 2010 @ 01:56 GMT
"In the discussion over the nature of mathematics, one interesting side-argument that recently started was over the idea of "understanding." What does it take to really understand something? The..."

The limits of mathematics
253 posts  •  created by Ian Durham   •  Feb. 13, 2010 @ 19:43 GMT
"I realize this forum hasn't gotten much action lately, but I'm hoping enough people pop on here that I get some feedback on this (particularly some of the membership who may have worked on or thought..."

Does Math Evolve?
24 posts  •  created by William Orem   •  May. 27, 2008 @ 18:15 GMT
"Here’s what I’m wondering: At Plank Density or greater, distinctions such as “here” and “there” have no operational meaning. When the universe was at this density, were simple arithmetical..."

Tegmark's Mathematical Universe
244 posts  •  created by Anthony Aguirre   •  May. 1, 2007 @ 13:03 GMT
"While he would be too modest to toot his own horn, there's nothing stopping me from pointing out that 'mad Max' has recently put out a very interesting paper on whether all possible formal systems..."

Wave function collapse demystified
161 posts  •  created by Antony Garrett Lisi   •  Apr. 27, 2007 @ 13:11 GMT
"There has always been an aura of mystical speculation surrounding quantum mechanics and the role of consciousness. The interpretation of wave function collapse (usually referred to as "the measurement..."

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