Discover and read the best of Twitter Threads about #quantummechanics

Most recents (7)

Daily Bookmarks to GAVNet 09/10/2020 greeneracresvaluenetwork.wordpress.com/2020/09/10/dai…
Psychological impacts of “screen time” and “green time” for children and adolescents: A systematic scoping review

journals.plos.org/plosone/articl…

#GreenTime #ScreenTime #psychology
It has four incarnations every lifetime, can return from the dead and is the subject of an unlikely new bestseller...

nexusnewsfeed.com/article/climat…

#EuropeanEels #LifeCycle #zoology
Read 8 tweets
You cannot ignore.....
Our inability to understand and grasp something doesn't mean that it doesn't exist.

#mystery #cognitiveload
West has yet to understand paranormal phenomenon.

Ancient civilizations has achieved so much that still today we are unable to understand and comprehend.

#History
Read 9 tweets
1/ Here is a proposal of how to distinguish between different, supposedly "equivalent," #orthogonal mixtures of photons. In this case, it is R + L mix of circular, to be distinguished from mixtures of linear #polarization.
#Physics #QuantumMechanics #ThoughtExperiment
I am leaving aside right here whether it could lead to #FTL communication (#SuperluminalSignalling), and focusing on the bare being able to make the distinction. Impractical - but of major theoretical importance.
#ProperMixtures #MeasurementProblem
We use a compound detector D for this purpose. Its first element is a quarter-wave plate with horizontal fast axis, that is rotationally free within a small angle (to allow measurement of changes in #angularmomentum of roughly a few hundred ħ, which is still very tiny.)
Read 14 tweets
#bicentennial
#germanculture
This year: 200th #anniversary of the #publication of #Goethe's great work of #art "#WestöstlicherDivan".#Heisenberg memorized #love-#poems from the book while working on #QuantumMechanics in #Heligoland.
#Schubert it to #music:
The #poem sung by #ElisabethSchwarzkopf is on p. 166 of the 1819 edition and reproduced below, side-by-side with the 1914 translation by #Irish critic and #poet Edward Dowden (1843-1913).The translation is close, but NOT accurate (as Dowden tries to recreate rhyme and rhythm).
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Remark. The unclear phrase 'zu jemandes Herzen sprechen' was
allegedly utilized by #Heidegger in at least one letter sent to
#HannahArendt in 1925: cf. lisa.gerda-henkel-stiftung.de/ich_muss_heute….
Read 4 tweets
Thought you all might like to know, say, the probability of a human passing through a wall. Yes? Yes, because #QuantumMechanics is fun! Let's begin!
The set up: a barrier with a higher energy than an electron. Think a tall wall, and a ball that didn't get thrown high enough to go over. Classically, the electron scatters back, like the ball bounces back. But in quantum, that electron has a probability of passing through!
With the above case for the electron, we can find something called the transmission coefficient, which is literally the probability of a particle to pass through a barrier. It looks like this: (Sakurai P. 526)
Read 12 tweets

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