Typical transition frequencies between two levels of an atom are 10^15Hz. The coupling between atoms and light is on the order of the decay rate at which photons are transmitted, which sits at around 10^6Hz.

I describe the atoms using a so called Lindblad master equation. The atoms are kept in this description, but the light field is eliminated using two assumptions:

1. The coupling between the two is very weak.
2. Correlations between the two decay so fast that this can be considered instantaneous.

The later produces white noise.

I work on quantum systems coupled to noisy environments (noisy as in causing random fluctuations). Atoms coupled to a light field are my specialty. Anyway, I just got invited by a predatory journal in the field of acoustics, vibrations and noise?!

Except they know that they would have to cover the apple in a thin metallic layer for it to be observable under an electron microscope :D

Thank god the universe is purely described using linear algebra.

Lovely picture! Either I don't get the meme part or I can't find Saddam.

Zum Thema Luke Mockridge: Absoluter Idiot.

Zum Comic: Warum ist das niedrigere Geschoss heller? Beleuchtet man Stockwerke nicht typischerweise immer gleich?

If you ever find yourself among theoretical physicists and/or astrophysicists and need a conversation starter, just ask about unit systems or unitless/natural measurement systems. There is no other profession that is more obsessed about that topic.

Just to put this here:

ħ=1

Every time I see a reference to Jackson I can only think of this...

https://www.youtube.com/watch?v=mm-4PltMB2A&

This has always been my biggest gripe with the exposition of this game. While studying physics I did the bare minimum of lab work and then dove into my theoretical specialization.

I remembered it being Newton's gravity potential, but looking at a picture it's just a big blur and could equally well be the force. Anyway, I applaud Ross as a physics layman for calling the scientists out.

Makes sense. Wigner's contributions are everywhere in physics and parts of math. Must've come from somewhere.

Quantenphysiker (aber keinen Hintergrund in Quantengravitation) hier. Kannst du erläutern, was meinst du mit symmetrisch meinst? Sehr einfach ausgedrückt passen Gravitation und Quantenmechanik nicht zusammen, weil unsere mathematische Beschreibung von Gravitation zu kompliziert (nichtlinear) ist. Unsere Quantentheorien haben deutlich simplere Formen, werden aber durch ihre hohe Dimensionalität schwer. Eine Quantisierung der Gravitation, Stichwort Graviton, ist deshalb theoretisch herausfordernd.

Was genau stört dich daran? Wir wissen bis heute nicht sicher, dass Neutrinos nicht ihre eigenen Antiteilchen sind. Alle Bosonen im Standardmodell treten nur als Vermittler von Kräften auf, d.h. sind nur temporär. Mein Leben wäre deutlich härter, wenn z.B. das Proton sein eigenes Antiteilchen wäre ¯\_(ツ)_/¯

Was auch immer das wird; bitte nehmt euch ein Zimmer.

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This is an antenna array, a periodic configuration of individual antennas that results in a much narrower emission and absorption profile/shape. The individual antennas are of several 10s of cm size which makes it a radio antenna. Very commonly used in military communication.

Ich habe auch nie Zahnseide verwendet. Dann wurde Karies im Zahnzwischenraum festgestellt, also Bohren und Füllen. Weil Symmetrie schön ist, war die andere Seite trotz Zahnseide nicht mehr zu retten und folgte ein Jahr später ebenfalls. Manchmal ist das Leben eine Lotterie...