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haushofer's latest activity
haushofer
reacted to
jack action's post
in the thread
How is Physics taught without Calculus?
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Like
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You should use the average force ##\bar{F}##: $$W = \bar{F} \Delta x = \left(\frac{k \Delta x + k (0)}{2} \right)\Delta x = \frac{1}{2}k...
Saturday, 4:25 PM
haushofer
replied to the thread
I
Gallilean v/s Lorentz transformation
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No. Not for gravitational phenomena or non-quantum dynamics like classical electromagnetism, that is.
Thursday, 10:38 AM
haushofer
replied to the thread
I
Gallilean v/s Lorentz transformation
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Relatively speaking.
Thursday, 10:37 AM
haushofer
replied to the thread
I
Gallilean v/s Lorentz transformation
.
We call this idea the correspondence principle: different theories are used in different regions. No theory is "the ultimate theory"...
Thursday, 5:23 AM
haushofer
reacted to
vanhees71's post
in the thread
I
Time Reversal Symmetry in Classical Physics
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It's a bit a subtle point you stumbled on. Time reversal doesn't simply mean that you make ##t \rightarrow t'=-t##, but you also have to...
Jun 3, 2024
haushofer
replied to the thread
I
Can you indeed rescue a person from a Black Hole?
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I read "The hooker will suffer Bob's fate" and wondered whether I entered a new subforum.
May 31, 2024
haushofer
replied to the thread
I
Are gravitons necessary?
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What makes the notion of gravitons a bit weird is that they're defined w.r.t. a fixed background spacetime which must be a solution to...
May 25, 2024
haushofer
replied to the thread
I
Einstein field equations
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These notes by Baez are also nice: https://arxiv.org/abs/gr-qc/0103044
May 25, 2024
haushofer
reacted to
PeterDonis's post
in the thread
B
Is velocity the reason for the time dilation effect?
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Like
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No, it isn't. You are thinking of it backwards. The invariants are where all the actual physics is contained; and the invariants are...
May 18, 2024
haushofer
reacted to
Demystifier's post
in the thread
I
What are anomalies in quantum field theory?
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Like
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The main problem with breaking of gauge symmetry is that the resulting theory is no longer unitary. In older literature it is argued...
May 14, 2024
haushofer
replied to the thread
I
What are anomalies in quantum field theory?
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My 2 cents: anomalies concerning gauge symmetries (or better: gauge redundancies) are all about degrees of freedom. In QED you start out...
May 13, 2024
haushofer
replied to the thread
A
"The 7 Strangest Coincidences in the Laws of Nature" (S. Hossenfelder)
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The gematria of Genesis 1:1 reveals its value as 2701, who's prime factorization is 37x73, two mirror prime numbers containing the...
May 9, 2024
haushofer
replied to the thread
I
When can I commute the 4-gradient and the "space-time" integral?
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See also Leibniz's integral rule: https://en.wikipedia.org/wiki/Leibniz_integral_rule or the lecture notes...
May 1, 2024
haushofer
reacted to
renormalize's post
in the thread
I
When can I commute the 4-gradient and the "space-time" integral?
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Like
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Since:$$e^{k_{\mu}x^{\mu}}=e^{k_{0}x^{0}}e^{k_{1}x^{1}}e^{k_{2}x^{2}}e^{k_{3}x^{3}}$$you only need to consider the behavior of a single...
May 1, 2024
haushofer
replied to the thread
Why are Physicists so informal with mathematics?
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Well, there are some physicists who think you should go to the philosophy department if you ask about ontology. In my experience quite...
Apr 27, 2024
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