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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

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

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 · 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 · 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 · 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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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 · 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

Where is this universal cereal bus I was promised?

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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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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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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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Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 02/06/2025

#baroquesun Hope you liked it, my late night coffee stopped working just in time just now thanks for having me!

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Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 02/06/2025

#baroquesun As the final piece for tonight, back to france, a lovely sung/staged bit from Rameau, one of his hits

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Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 02/06/2025

#baroquesun Coming up in a minute is Vikingur Olafsson's rendition of a solemn J.S. Bavh organ piece... the ref might twitch a bit for it is hip, but not exactly HIP...

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Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 02/06/2025

Since there seem to be some timing issues, everyone should now (5 minutes after the hour) be at video #4 Chatpentier Te Deum minute 12

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Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 02/06/2025

Most Europeans will recognize the first main theme of the Charpentier Te Deum as the Eurovision intro melody for joint TV broadcasts. #baroquesun

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Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 02/06/2025

#baroquesun Lully at a theater music monopoly at the Sun King's court, redtricting what the slightly younger Charpentier, also at Louis XIVs cozrt, could accomplish there.

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Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 02/06/2025

#baroquesun What I find fascinating about this Sinfonia in Hamburg is who commissioned it - a figure influencing in the shadows of the whole development of cöassical music, Baron van Swieten. He asked CPE to write some pieced without worries about restrictions or critics. The same Baron who […]

astrodon.social

Original post on astrodon.social

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Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 02/06/2025

#baroquesun Carl Philipp Emanuel actually took his late Godfather's post in Hamburg in the year after Telemann's death, moving away from Berlin and the King, and remained there until his own death.

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Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 02/06/2025

#baroquesun Telemann was very prolific and was therefore considered lesser a composer by music snobs, but there is a lot of Gold to be found in his huge output, and if J.S. liked it,who are we to judge

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Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 02/06/2025

It's not an accident that tonights first two composers share a first name. Georg Philipp Telemann, who was a valued fried and colleague of John Sebastian, is Carl Philipp Emanuel's Godfather #baroquesun

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Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 01/06/2025

Eine ganz beachtliche Listspinne mit Gepäck im Dossenheimer Wald. Ich habe jetzt mal das Paarungsritual auf Wikipedia geleaen und es ist so mit das Lustigste, was ich je diesbezüglich gesehen habe #biologie #animalphotography

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Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 31/05/2025

Super weird collective movement of aphids on a stem in our yard. Have you ever seen this behavior? #biology #animalphotography

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Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 31/05/2025

We are thinking a lot lately about the role of writing and the purpose or lack thereof of writing assignments in school, in the age of AI, in an age of purportedly diminishing reading and writing skills. Anyway, time to repost this wonderfully provocative and irreverent talk/course on writing […]

astrodon.social

Original post on astrodon.social

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Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 29/05/2025

Here, enjoy Prince's legendary guitar solo at the awards show youtu.be/dWRCooFKk3c #music

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Reposted by Alexander Knochel

Andrew J. Steinmetz @ajsteinmetz.com · 29/05/2025

I think the terminating series step in the hydrogen atom derivative is beautiful. The physical constraint that solutions to the hypergeometric differential equation be L²-integrable directly leads to quantized energy levels. #Physics #Science #MathSky ⚛️🧪🧮

Demonstration of the terminating condition for the hydrogen atom solution.

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Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 29/05/2025

If I were an evil king or wizard, I'd lock a mathematician in a tower until they can explain to me what a gerbe is in a way I understand. #math

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Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 27/05/2025

Preliminary #hamradio Announcement: Balloon 70cm SSTV experiment on June 25 in Weinheim! On June 25, we will, weather permitting, launch a weather balloon in Weinheim @DL0WH carrying student-built payloads. Apart from LoRaWAN-experiments, we will test our […] [Original post on astrodon.social]

A group of people launching a white weather balloon on a large lawn, blue sky and some trees in the far back

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Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 26/05/2025

Nice discussion on the foundations of Quantum Mechanics, I feel like Brian Greene has gotten better at physics scicomm youtu.be/VbXEc9vpeIM

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Reposted by Alexander Knochel

Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 22/05/2025

Silly extreme Fermi estimating #cosmology #physics #astronomy insight of the day, if you just take the milky way as 100 billion solar masses and calculate the resulting density of the universe via the distance to Andromeda as a sphere around the milky way […] [Original post on astrodon.social]

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Alexander Knochel @quantensalat.astrodon.social.ap.brid.gy · 23/05/2025

Schöne SdW mit Aufmacher über das Langlands-Programm, ich bin dankbar für einen kleinen Überblick zum Einstieg in diesen unglaublichen Themenkomplex. Modulformen etc. sind mir im Zusammenhang mit Superstring/F-Theorie schon begegnet, aber die ganze […] [Original post on astrodon.social]

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