Sagittarius A-Star's latest activity
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Sagittarius A-Star reacted to Roberto Pavani's post in the thread Undergrad Ampère's mercury experiment and Aharonov-Bohm: same message? with
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Yes, I think I was expressing roughly the same thing in a less rigorous way. Thank you for the precise formulation. What I was... -
Sagittarius A-Star replied to the thread Undergrad Ampère's mercury experiment and Aharonov-Bohm: same message?.They are caused by electromagnetic forces, not by ##A## itself. In 4D-Spacetime Algebra, the electromagnetic field bivector is...
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Sagittarius A-Star replied to the thread Undergrad Ampère's mercury experiment and Aharonov-Bohm: same message?.This is an interesting link. I think a convincing explanation is the following, because a magnetic field only from the moving part of...
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Sagittarius A-Star reacted to Roberto Pavani's post in the thread Undergrad Ampère's mercury experiment and Aharonov-Bohm: same message? with Like.
@Dale I've found an interesting link: http://www.ampere.cnrs.fr/histoire/parcours-historique/lois-courants/force-obsolete/eng...
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Sagittarius A-Star replied to the thread Undergrad Ampère's mercury experiment and Aharonov-Bohm: same message?.Is this the scenario? https://kirkmcd.princeton.edu/examples/hairpin.pdf
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Sagittarius A-Star replied to the thread Undergrad Ampère's mercury experiment and Aharonov-Bohm: same message?.Why is there a symmetry?
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Sagittarius A-Star replied to the thread Space Stuff and Launch Info.Source: https://asiatimes.com/2026/04/us-china-space-race-shifts-into-a-higher-lunar-gear/
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Artemis III crew announcement Randolph Bresnik (previously flew on the Space Shuttle and Soyuz) Luca Parmitano (ESA, previously flew...
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Sagittarius A-Star replied to the thread Undergrad The effect of a radio wave on an electron.@tech99 As I wrote in posting #5, In the ionosphere, the acceleration of the electron is proportional to E(t). In a resistor, the...
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Sagittarius A-Star replied to the thread Undergrad The effect of a radio wave on an electron.You can find an analogy in posting #4. The math you can find in the OP, when considering the initial conditions in the OP's attachment...
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Sagittarius A-Star replied to the thread Undergrad Textbook description of R##\ddot{\text o}##mer's light speed calculation.Diagram for Doppler calculation in posting #17, when Earth is moving away from Jupiter (not to scale):
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Sagittarius A-Star replied to the thread AI Disproves Unit Distance Conjecture.This video explains the problem:
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Sagittarius A-Star replied to the thread What Caused the Recent Power Outage in Spain, Portugal, and Southern France?.Source: https://arstechnica.com/science/2026/03/final-analysis-of-2025-iberian-blackout-policies-left-spain-at-risk/
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Sagittarius A-Star replied to the thread Undergrad Textbook description of R##\ddot{\text o}##mer's light speed calculation.No. Call a time-interval near Jupiter (for example the duration of an eclipse) ##\Delta t_0## . The distance between points ##1## and...
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Sagittarius A-Star replied to the thread Undergrad Textbook description of R##\ddot{\text o}##mer's light speed calculation.The Doppler effect does not require an ether. According to special relativity, the speed of light in vacuum is exactly ##c## in each...
