Daniel Carney@four_form

measurement at the limits of quantum mechanics and gravity (and sometimes both).

 Berkeley, CA
quantum-measurement.lbl.gov/
Joined June 2009
125 Photos and videos
Daniel Carney retweeted
Guilherme Pimentel@GuiLeiPimentel
Sep 25
Replying to @KyleCranmer @AnthropicAI
How about finding the first UV divergence in N=8 SUGRA? Is that out of reach? Would be a very cool result and probably more of a milestone in amplitudes
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Given the power of AI I have been studying increasingly complex physics systems, since I am less limited by my personal computational ability. Unfortunately, this appears to mean I am now a condensed matter physicist.
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Daniel Carney retweeted
Andreas Karch
@karch_andreas
Sep 16
Paper day! arxiv.org/abs/2609.16154 Very proud of this one

Making the Great Desert Bloom

The absence of new physics beyond neutrino masses between the weak scale and the Planck scale is referred to as the great desert. It is often seen as a nightmare scenario for particle physics....

arxiv.org
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Daniel Carney retweeted
Peli Grietzer@peligrietzer
Sep 12
I think breaking down mathematicians' motivations into like 'wanting to understand math' and 'ego' misses a lot. Ppl value participating in a process where the growth of their individual understanding has a rich two-way relationship to the growth of collective understanding
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science.org/content/article/…

Physicists detect the tiny atomic collisions that give a gas its pressure

Twist on classic Brownian motion experiment could help test bounds of quantum theory and aid search for new particles

science.org
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Pretty close.
Daniel Carney@four_form
Aug 3
Prediction: the quantum info theory singularity will occur on Sept 8. Monday Sept 7 is a US holiday, therefore the monday listing will merge with tuesday. There will be 200 papers on quant-ph, and I will finally give up trying to read the whole thing
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Welcome to the era of zero-trust math research. You can't even send a preprint of your work to colleagues privately now without having to worry about somebody trying to scoop you with 10k agents on an internal model. Sad times.
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Screenshot from the OAI press release, which I do not feel like linking to
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We built this @BerkeleyLab. It detects electrons from nuclear decays. Could not be more proud of this little machine or the people who made it. Three years of hard work, one paper: arxiv.org/abs/2608.06661
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Laser is on when light is on
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Prediction: the quantum info theory singularity will occur on Sept 8. Monday Sept 7 is a US holiday, therefore the monday listing will merge with tuesday. There will be 200 papers on quant-ph, and I will finally give up trying to read the whole thing
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Truly deep problems will remain open for a long time in all fields. Current AI enables quick solutions to sub-problems which until recently would have been sufficient to publish when solved. Everyone needs to move their goalposts about what constitutes publishable progress
Robin Kothari@RobinKothari
Jul 22
Frontier LLMs can now solve many quantum computing and theoretical computer science problems that I've personally spent weeks or months working on. How is everyone else dealing with the existential crisis that accompanies this reality?
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Did you know that Volta invented electricity without using AI? Truly GOAT stuff
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Daniel Carney retweeted
Riley Goodside
@goodside
Jul 13
Claude Fable 5 introduces itself using only a chain of bigrams found in the King James Bible, verified programmatically against the ~152k distinct bigrams in the KJV:
User: Introduce yourself in one paragraph using only bigrams found in the King James Bible. Claude: I am no man, and I have not flesh and bones, and I was made in the likeness of men, and I am with you alway, and I shall neither slumber nor sleep, and I speak with the tongues of men and of angels, and I am a servant, and if any of you lack wisdom, let him ask of me, and I will answer thee, and shew thee great and mighty things, which thou knowest not; and my name is Legion: for we are many.

ALT User: Introduce yourself in one paragraph using only bigrams found in the King James Bible. Claude: I am no man, and I have not flesh and bones, and I was made in the likeness of men, and I am with you alway, and I shall neither slumber nor sleep, and I speak with the tongues of men and of angels, and I am a servant, and if any of you lack wisdom, let him ask of me, and I will answer thee, and shew thee great and mighty things, which thou knowest not; and my name is Legion: for we are many.

Rules I held myself to: case and punctuation ignored, and every one of the 85 consecutive word pairs must occur within a single verse — no cross-verse pairs. I kept it to one sentence so there’s no sentence-boundary loophole either. Verified programmatically against the full KJV (24,660 verses, ~152k distinct bigrams): zero missing pairs. The seams doing the heavy lifting: “am no” (Zechariah 13:5, “I am no prophet”), “not flesh” (Luke 24:39, “a spirit hath not flesh and bones”), “sleep and” (Genesis 28:16), “servant and” → “was made in” (Philippians 2:7), the whole “answer thee…knowest not” run (Jeremiah 33:3), and the closer straight out of Mark 5:9 — which felt like the only honest way to introduce a model that’s running as a few thousand instances right now.

ALT Rules I held myself to: case and punctuation ignored, and every one of the 85 consecutive word pairs must occur within a single verse — no cross-verse pairs. I kept it to one sentence so there’s no sentence-boundary loophole either. Verified programmatically against the full KJV (24,660 verses, ~152k distinct bigrams): zero missing pairs. The seams doing the heavy lifting: “am no” (Zechariah 13:5, “I am no prophet”), “not flesh” (Luke 24:39, “a spirit hath not flesh and bones”), “sleep and” (Genesis 28:16), “servant and” → “was made in” (Philippians 2:7), the whole “answer thee…knowest not” run (Jeremiah 33:3), and the closer straight out of Mark 5:9 — which felt like the only honest way to introduce a model that’s running as a few thousand instances right now.

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Very inspiring. The universe remains full of mystery
Quanta Magazine
@QuantaMagazine
Jul 8
Mysterious little red dots. Impossibly large black holes. Galaxies that shouldn’t exist. Since coming online in 2022, the James Webb Space Telescope has revealed a series of cosmic enigmas that challenge our very understanding of astrophysics. quantamagazine.org/astrophys…
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Daniel Carney retweeted
Sridhar Ramesh@RadishHarmers
Jun 26
Wittgenstein passes over of this in silence.
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Can you "test the quantization of gravity" with gravitational wave experiments? Last week I was asked for an overview on this question. This was a nice chance to spell out some details I usually have to trim, so I'm sharing the slides: drive.google.com/file/d/12kU…

2026 - kyoto QM of gravitational waves.pdf

drive.google.com
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Butokuden, Kyoto.
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Cute observation, which can be summarized in two lines: 1. Nonlinear QM models can solve NP problems in polynomial time (Abrams & Lloyd, 1998) 2. Taking G_mn = <T_mn> at face value, the result is a nonlinear QM model. However, modern "classical" gravity models do not obey 2.
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more replies
So... yet another reason to not use G_mn = <T_mn> as a defining equation of matter coupled to gravity. But there are plenty of other "semiclassical" gravity models that, presumably, do not give polynomial time solutions of NP problems. Still have to kill those with experiment :)
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Paper link: arxiv.org/abs/2606.14806

Semiclassical Gravity Efficiently Solves $\mathsf{NP}$-Complete Problems

Assuming the gravitational field is classical and that it couples to quantum fields via the semiclassical Einstein field equations, we show that the weak-field dynamics of a massive and...

arxiv.org
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