Sagittarius A-Star's latest activity
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Sagittarius A-Star replied to the thread Undergrad Small question about constantly accelerating charges.According to Wolfgang Rindler, the EP cannot be applied to the "paradox" of an accerated charge, because it's field is not local. An... -
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Sagittarius A-Star replied to the thread Graduate Can a causal or time-like structure emerge without assuming a metric?.Maybe this helps: https://www.wolframphysics.org/technical-introduction/potential-relation-to-physics/time-and-spacetime/ via...
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Sagittarius A-Star replied to the thread Undergrad Photons & Time: t=0 What?.For example: If you send a light pulse from Earth to Alpha Centauri, then the spacetime-interval between the emition-event on Earth and...
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Sagittarius A-Star reacted to DaveC426913's post in the thread Undergrad Photons & Time: t=0 What? with
Agree.
That would be a commute of 30 minutes! Less than it takes me on a busy Monday. -
Sagittarius A-Star replied to the thread Undergrad Photons & Time: t=0 What?.For example: The distance from Earth to Alpha Centauri is 4.367 LY. If you travel with 99.99999999 % light speed (relative to Earth) to...
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Sagittarius A-Star replied to the thread Graduate Can a causal or time-like structure emerge without assuming a metric?.Maybe that helps: Source: https://en.wikipedia.org/wiki/CPT_symmetry#Derivation_of_the_CPT_theorem
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Sagittarius A-Star replied to the thread Graduate Can a causal or time-like structure emerge without assuming a metric?.In classical physics, the only "asymmetric" law, which contains an arrow of time, is the the second law of thermodynamics.
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Sagittarius A-Star replied to the thread Is A.I. more than the sum of its parts?.I have the suspicion, that the following physics videos are also AI fake: https://www.youtube.com/@TheUniverseAccordingtoSusskind...
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Sagittarius A-Star reacted to robphy's post in the thread Graduate Dirac's 1958 lecture on spinors with
Informative.
From https://www.nobelprize.org/uploads/2024/02/penrose-lecture.pdf You can read this 1936 Dirac reference here... -
Sagittarius A-Star reacted to Ibix's post in the thread Undergrad Why can coefficient "a" between spacetime intervals depend on velocity between systems? with
Like.
Relative velocity means the velocity one thing measures the other to have. Here, you've calculated the velocity difference between two... -
Sagittarius A-Star replied to the thread Undergrad Why can coefficient "a" between spacetime intervals depend on velocity between systems?.The absolute value of relative velocities is in both cases not ##4m/s##. If the individual velocities of your 4 frames refer to a...
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Sagittarius A-Star reacted to Herman Trivilino's post in the thread Undergrad Light clock treating horizontal and vertical motion differently? with Like.
That's not relevant! What we're doing here is using the two postulates to draw conclusions. This entire thread is a discussion of the...
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Sagittarius A-Star reacted to robphy's post in the thread Undergrad Light clock treating horizontal and vertical motion differently? with Like.
The Michelson-Morley apparatus is essentially a [typical] transverse light-clock (whose light-signal is perpendicular to the direction...
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Sagittarius A-Star replied to the thread Undergrad Linear vs rotary motion.Mach described it in the following way: Source (chapter 2 "Nonrelativistic Machian Theories" , page 109)...
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Sagittarius A-Star reacted to Filip Larsen's post in the thread Undergrad Linear vs rotary motion with Like.
As I read it, the OP is effectively asking if Mach's principle holds or not.
