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Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 20/06/2025

Now that's an amphora I can get behind, literally.

A roughly 1.40 m tall minoan amphora shaped clay vessel with two big handles on display at the archaeological museum in Sitia

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Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 18/06/2025

More Minoan ruins, this time the former mightly Palace of Zakros (~1500 BCE)

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Reposted by Alexander Knochel

Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 18/06/2025

The Ising model in a transverse field is one of the most fundamental models in quantum many-body physics. Despite being around for more than 60 years, we still make new discoveries in it. In our latest work, we show the existence of a dynamical phase […] [Original post on fediscience.org]

Plot showing the density of the quantum Fisher information (a measure of the quantum enhancement of a sensor) over time. The plot shows differently colored functions, corresponding to different number of particles. Each function has a pronounced maximum that increases for larger number of particles.

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Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 17/06/2025

Here, enjoy some Minoan ruins I stumbled across... Apropos of nothing, is anyone else here as big a fan of Indie: Fate of Atlantis as me? (*) (*) i.e., old

The remaining roughly foot high walls of a minoan trade town ca. 1500 BC, outlines of rooms and dorways are visible, trees and blue sky in the background

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Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 16/06/2025

One thing I will add very probably is a short introduction to the "naïve" quantization of general relativity, gravitation as graviton exchange, and quantum field contributions to dark energy

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Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 16/06/2025

@ajsteinmetz.com I really appreciate Itzykson/Zuber for doing things many others don't do, it was a great resource. What we are doing / have in mind is a combination of much friendlier, pragmatic, talkative but very much down to technical detail. The book / the philosophy partly grew out of the […]

astrodon.social

Original post on astrodon.social

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Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 16/06/2025

What QFT book would you like to read? If you were to buy an introductory, somewhat informal but not too shallow book on relativistic quantum field theory, which topic would you like to see covered as a bonus chapter beyond the standard treatment (lagrangians and hamiltonians, canonicsl […]

astrodon.social

Original post on astrodon.social

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Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 16/06/2025

@vicgrinberg Considering what organic molecules in our food are made of, we're also made of garbage in a more immediate fashion ;-D

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Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 16/06/2025

Überforderung, die: Als Physik-Lehrkraft in einer Diskussion mit türkischen Schülern Atatürk verteidigen müssen

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Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 15/06/2025

@xgranade Ok I'm confused but intrigued, why is a hundred year old thought experiment leading to gatekeeping?!

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Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 15/06/2025

@xgranade I feel like I'm missing some context, are you talking about quantum in the "tech" industry specifically? Because sure there probably is gatekeeping in misogyny in physics in general, but singling out one sub field of physics seems weird

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Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 14/06/2025

Are there any experts on General Relativity and Einstein-Cartan theory here? I have some technical questions #physics #cosmology

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Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 14/06/2025

O-Ton Martin Luther Ihm ging es wohl beim Übersetzen der Bibel nicht besser als so manchem zeitgenössischen Autor, und man kann sich vorstellen dass er auf der Wartburg auch ziemlich an Bewegungsmangel litt...

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Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 14/06/2025

Sometimes.I feel like we're the generation where the nostalgia is really rationally justified.

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Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 14/06/2025

@HJB Sind die Bullet Points mit "oder" oder mit "und" verknüpft?

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Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 12/06/2025

TL;DR close encounter with large invasive pufferfish So I came eye to eye with "the most dangerous fish in the mediterranean" (*) today, a pretty big specimen of Lagocephalus sclearatus. It's an invasive species of large pufferfish migrating from the tropics due to clinate change causing big […]

astrodon.social

Original post on astrodon.social

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Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 12/06/2025

[big spider] Should I stay or should I go now?

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Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 12/06/2025

@Edwin085 It's a wonder that I can even ride to work on my sub 1k bike.

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Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 11/06/2025

RIP Brian Wilson :-( (via sergio_101@sixdigreesofohio.social) youtu.be/u90beUXTKwo

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Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 11/06/2025

My wife knows me apparently Intersting book by one of my favorite HIP conductors with all the stuff in it I geek out on #baroque #classicalmusic

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Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 11/06/2025

Been at an iconic beach and kind of taken aback how pathological this is - so many younger people are acting like Instagram zombies, they don't seem to have fun or.enjoy the moment or the scenery at all, they come, awkwardly search for a photogenic angle, set up an arttificaly scene simulating […]

astrodon.social

Original post on astrodon.social

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Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 11/06/2025

"Let's give this hilbert space vector a little friend, everybody needs a friend" (*) (*) literally Zurek's trick for constructing probabilities in quantum mechanics

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Reposted by Alexander Knochel

Gary @N8DMT @n8dmt.mastodon.radio.ap.brid.gy · 10/06/2025

Finished up the writeup for the analysis of the 17’ ground mounted vertical with 60’ lazy Sloper Wire antenna system. Details are in a new post at the website. Results: Might use this for this year’s field day activity. #HamRadio #FieldDay […] [Original post on mastodon.radio]

Analysis drawing for the 17' vertical antenna with 4 counterpoise and 60' lazy Sloper Wire.

Graphical analysis results for the antenna system showing VSWR curve in lower left.

Far field antenna pattern for the antenna at 3 MHz. Pattern shows directivity in the opposite direction of the Sloper Wire heading.

Far field antenna pattern at 7 MHz shows more of an "UP" pattern compared to down at 3 MHz. Interesting! Have more pattern vs. frequency plots up on the posting page.

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Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 10/06/2025

@jik Wow. You are right, a year ago I laughted about the prediction

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Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 07/06/2025

Our student built balloon SSTV electronics are still *super* glitchy, but we managed a few rounds testing with local hams

A somewhat incomplete SSTV image showing a still image of a computer workspace, scattered tools and a piece of paper held into the camera saying "DF70UKW"

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Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 06/06/2025

@hannah I misread this as Guiness and it totally made sense

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Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 06/06/2025

Where is this universal cereal bus I was promised?

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Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 06/06/2025

@stuartl @VeroniqueB99 I thought about this, and I decided it must be a hint that this conversation might have played out like this on differenr days, or months, or maybe more than once.

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Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 06/06/2025

Geständnis - Ich habe noch nie #thomasmann gelesen. Vor ein paar Tagen war ich auf einer Party wo der Zauberberg im Regal stand, und ich habe mich mal reingelesen. Jetzt bin ich neugierig...

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Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 04/06/2025

@ajsteinmetz.com I'd be especially interested in why the dual black hole of my warm cup of coffee doesn't suck me into its singularity (or maybe it does!?) ^^

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Reposted by Alexander Knochel

Andrew J. Steinmetz @ajsteinmetz.com · 04/06/2025

@quantensalat.astrodon.social.ap.brid.gy Haha, black holes are always fun. I struggled to fit what I could into one post, so I'll do a follow-up and note the correspondence between the fluid and the black hole. :)

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Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 04/06/2025

@Landrichterin Tja - wenn du lange genug in die Radiologie blickst, blickt der Radiologe in dich hinein....

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Reposted by Alexander Knochel

Andrew J. Steinmetz @ajsteinmetz.com · 03/06/2025

#AdS/CFT correspondence can turn a strong coupled #QFT into a weak coupled #StringTheory. This predicted the viscosity of a coupled fluid given by η/s ≥ ħ/4πk ≈ 0.08 close to quark-gluon plasma #QGP (≈0.1-0.2) #Physics #Science 🧪 ⚛️ 🧮 DOI: doi.org/10.1103/Phys... arXiv: arxiv.org/abs/hep-th/0...

doi.org

Viscosity in Strongly Interacting Quantum Field Theories from Black Hole Physics

The ratio of shear viscosity to volume density of entropy can be used to characterize how close a given fluid is to being perfect. Using string theory methods, we show that this ratio is equal to a un...

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