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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 forums@fqxi.org 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.

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RECENT FORUM POSTS

Robert McEachern: ""all experiments have pointed towards this and there is no way to avoid..." in Review of "Foundations of...

Joe Fisher: "Dear Steve Agnew, Naturally provided VISIBLE realty am not a silly humanly..." in Can Time Be Saved From...

James Putnam: "Light bends because it is accelerating. It accelerates toward an object..." in Black Hole Photographed...

Steve Agnew: "Stringy and loop quantum are the two big contenders, but neither has a..." in Can Time Be Saved From...

Robert McEachern: "Lorenzo, The nature of "information" is well understood outside of..." in Review of "Foundations of...

Georgina Woodward: "Steve, Lorraine is writing about a simpler "knowing " rather than the..." in The Nature of Time

Steve Agnew: "Knowing information necessarily means neural action potentials. Atom and..." in The Nature of Time


RECENT ARTICLES
click titles to read articles

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.

Dissolving Quantum Paradoxes
The impossibility of building a perfect clock could help explain away microscale weirdness.


FQXi BLOGS
May 20, 2019

New Blog Entries
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Black Hole Photographed for the First Time: EHT Announcement
By ZEEYA MERALI • Apr. 9, 2019 @ 19:33 GMT

Updated:

Scientists have obtained the first image of a black hole, using Event Horizon Telescope observations of the center of the galaxy M87. The image shows a bright ring formed as light bends in the intense gravity around a black hole that is 6.5 billion times more massive than the Sun. This long-sought image provides the strongest evidence to date for the existence of supermassive black holes and opens a new window onto the study of black holes, their event horizons, and gravity. Credit: Event Horizon Telescope Collaboration

Official press announcement.

On 10 April, astronomers revealed the first ever image of a black hole event horizon -- the surface beyond which light cannot escape from the hole's grasp -- taken by the Event Horizon Telescope (actually a network of telescopes around the world).

You can watch the English language press conference from Brussels live:


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Information as Fuel — A New FQXi Research Program
By ANTHONY AGUIRRE • Feb. 13, 2019 @ 19:03 GMT

We're proud to announce one of our latest ventures: a research program investigating the theme of "Information as Fuel." We intend to award up to US$8million in this program, which has been sponsored by the Templeton World Charity Foundation. We are currently accepting initial applications for experimental projects on the topic, until March 31, 2019.

What do we mean by "information as fuel"? Since at least the nineteenth century, when people sought to understand how steam engines work and what limits their efficiency, it has been known that there is an intimate link between information and thermodynamics. Analysis of the physical limits of information acquisition and erasure has established a fundamental connection between information and the second law of thermodynamics. Inverting this relationship leads to the intriguing possibility that (ordered) information may serve as a resource—in effect, a type of fuel.

Expressed in the starkest terms, cutting-edge theoretical work implies that one could run an engine using information either as the fuel or as the way to dump entropy to satisfy the second law. Other conjectures have been accompanied by thought experiments that try to elucidate the implications of newly developed concepts. But while significant theoretical progress is being made, experimental study of the non-equilibrium thermodynamics of information generally has tended to trail some distance behind.

Fortunately, advances in experimental techniques are putting practical experiments with such systems within reach. Quantum information can be created and manipulated in a variety of implementations, ranging from trapped ions to solid state superconducting circuits to spin states of electrons. There is thus rich scope for applying concepts of quantum thermodynamics to quantum systems out of equilibrium.

With this in mind, FQXi has chosen to focus entirely on experiments in the Information as Fuel grant round. We intend to fund 4-8 research groups globally with three-year grants ranging from $500,000 to $2,500,000 per research group. Each group will design, perform, and report on one or more experiments, in which the group will incorporate a significant theoretical effort as part of the experiment’s motivation, design, and interpretation.

Both our large-grant and mini-grant programs are designed to particularly encourage new collaborations between experimentalists and theoreticians. The Information as Fuel theme will also be featured at a future FQXi international conference, and through essay contests. FQXi has always been committed to fostering a vibrant research community, and we envision that the Information as Fuel program will continue in this tradition.
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Our Quantum Reality: A Physics-Art Project
By PAUL KNOTT • Feb. 4, 2019 @ 16:14 GMT

Paul Knott & Joseph Namara Hollis
In my day job, I am a quantum physicist, but I also recently completed a collaborative art-physics project, with award-winning artist Joseph Namara Hollis, to produce a short, illustrated book about the quantum mechanical reality in which we live.

From the start, this was an ambitious project. Our aim was to introduce quite challenging philosophical concepts deeply embedded in quantum mechanics. Our target audience was broad: we hoped that anyone from school science students to academic quantum physicists would both learn something, and be entertained, by the book. And finally, the book is short – only six double page spreads – and contains minimal text, with the intention that the illustrations play a central part in conveying the concepts we introduce. So, have we succeeded? You can find out by reading the book online here.

The seed of this project began when I undertook a short Postdoc, as part of FQXi’s physics of the observer program, at the University of Nottingham, with supervisors Prof Gerardo Adesso, Dr Tommaso Tufarelli, and Dr Marco Piani. The general question I was to dive into was: why does our everyday world look the way it does, despite being made of bizarre quantum mechanical particles? Quantum entities, such as electrons, atoms, and photons, perpetually exist in bizarre states: they can be in two places at the same time, be travelling in multiple directions simultaneously, and can even teleport. But if everyday objects – such as chairs, tables and cats – are made of such things, then why do they look so normal?

The more specific question we hoped to answer related to the concept of objectivity. If two people look at the same object then they invariably agree on the details, such as the size, shape, and orientation, of the object. These properties are said to be objective. But, due to the bizarre quantum world discussed above, it is not clear at first sight why objects that are made of quantum mechanical particles should look objective. To cut a long story short, our work during this project, together with previous quantum physicists’ results, demonstrated that the mathematical structure of quantum mechanics itself implies that everyday objects should indeed have objective properties. As part of this project we collaborated with the same artist, Joseph Namara Hollis, to produce an illustration related to our work, which we were honoured to be selected for the front cover of Physical Review Letters.

But despite the success of this work, I wasn’t quite satisfied with the philosophical backdrop to our findings. Our results were mainly concerned with why we observe the world to be objective. But using the quantum mechanical formalism we can go beyond our mere observations, and ask questions about the whole of reality – the observed and the unobserved – in which we live. And when I plunged into such questions, I emerged with a strong view that the equations of quantum mechanics are really telling us that our universe is only one in an unimaginably large number of parallel universes! This is certainly not the only conclusion that can be drawn from the equations of quantum mechanics, but for reasons that I explain here, I personally find this the most convincing and compelling.

This brings us to the main motivation of creating the FQXi-sponsored illustrated book that this blog pertains to. When we use both philosophy and physics to dive into the question of what quantum physics really tells us about reality, it turns out that there are many possible answers (of which quantum parallel-universes is just one). Other answers include that quantum mechanics must be incorrect or incomplete, and a revised theory is necessary in order to make sense of reality; or that quantum mechanics is really telling us about our knowledge of the world, rather than directly relating to the objects in our surroundings themselves. But when scouring through the literature to try to understand this, I found that the introductions and explanations to the different theories were dense and complicated, and it seemed impossibly hard to form a simple, overarching picture of what quantum mechanics tells us about reality.

This, then, is the purpose of the book: to create a (relatively) straightforward overview of the various theories that quantum physicists use to explain reality; and to introduce the philosophical conundrum at the heart of quantum mechanics that requires such an array of theories to be introduced. And to do all this is an entertaining and intuitive way by using the beautiful and fantastical illustrations of Joseph Namara Hollis.

We invite you to take a look at the book, which is freely available, and let us know what you think!



Paul Knott is a quantum physicist at Nottingham University.
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YouTube Video Lectures: Thinking about Quantum Gravity
By TEJINDER PAL SINGH • Jan. 21, 2019 @ 18:09 GMT

There is likely a deep connection between the study of quantum foundations on the one hand, and the much sought after quantum theory of gravity on the other. Despite the enormous success of quantum theory, there are issues in our understanding of the theory, which need addressing. These include: the nature of the quantum to classical transition, the peculiar nature of quantum non-locality, the problem of time in quantum theory, the extreme dependence of the theory on its own classical limit, and the physical meaning of the wave function. Could it be that addressing these issues requires us to reformulate / modify quantum theory, in such a way that we get rid of the theory's dependence on its own limit, and on classical space-time? If that is the case, then introducing non-classical space-time in quantum theory naturally leads us to a falsifiable quantum theory of gravity. This is the viewpoint developed in the ongoing video lecture series `Thinking about Quantum Gravity'. The lectures are addressed to those undergraduate and graduate students in physics who would like to research in quantum gravity. It is not expected that the viewer will agree with everything that is said in these lectures. Rather, it is hoped that you will find something to think about, as you develop your own thinking towards quantum gravity.



The first video is available on YouTube and every video gives the link to the next one. Your comments and criticisms will be greatly appreciated. Thank you.

--

Tejinder P. Singh

Tata Institute of Fundamental Research, Mumbai
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2018: The Physics Year in Review
By ZEEYA MERALI • Dec. 31, 2018 @ 21:44 GMT

iStock/yuriz
It’s that time of year again! As 2018 comes to a close, we’re counting down the highlights (and lowlights) of the year in physics, as chosen by FQXi member and quantum physicist Ian Durham. Listen to tales of exploding labs, Nobel controversies, smashed records, foundational breakthroughs, and enterprising slime mold.

Free Podcast

2018 Year in Physics Review Part 1: We begin our countdown of the top physics stories of the year, as chosen by Ian Durham.

LISTEN:

Go to full podcast

Both parts of the podcast review are now up for you to enjoy. Let us know what we missed, what we should have placed higher, and if you disagree with our picks.

With best wishes for a healthy and happy 2019 from all of us at FQXi!

Free Podcast

2018 Year in Physics Review Part 2: We conclude our countdown of the top physics stories of the year, as chosen by Ian Durham.

LISTEN:

Go to full podcast


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