pervect's latest activity
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Ppervect replied to the thread Undergrad Gravitational analog of electromagnetic force.The organizational structure in MTW actually illustrates why there are 20 degrees of freedom and 21 unique (up to sign) nonzero...
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Ppervect replied to the thread Undergrad Gravitational analog of electromagnetic force.I was doing some more reading, and apparently the "modern" approach to the topic involves decomposing the Weyl tensor rather than the...
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Ppervect replied to the thread Undergrad Macroscopic objects in free-fall.It seems to me you are asking, at least in in part, about the self-force problem. "How does a particle, the thing that you are calling...
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Ppervect replied to the thread Undergrad Gravitational analog of electromagnetic force.There is a way to break down, or decompose, the curvature tensor in General relativity (called the Riemann tensor) into parts, which can...
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Ppervect replied to the thread Undergrad Linear vs rotary motion.If you do an experiment in a small sealed box where you only look at things inside the box, the laws of physics according to special...
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Ppervect replied to the thread High School True static equilibrium and effects on time.I'm on board with this - I regard it as the theory of timelike congruences, which I first stumbled across in Wald, and later read more...
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Ppervect replied to the thread High School True static equilibrium and effects on time.I have espoused that idea, and met a lot of resistance in certain instances. When I have the energy, I still do sometimes like to...
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Ppervect replied to the thread High School True static equilibrium and effects on time.I would use much simpler (but also less precise) language to convey a similar thought. I would call "causal diamonds", light clocks...
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Ppervect posted the thread High School Relativistic simultaneity and effects on time in Special and General Relativity.MENTOR NOTE: This thread is a continuation of the following thread and focuses on Relativistic Simultaneity and it's effects on time...
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Ppervect replied to the thread High School True static equilibrium and effects on time.I would suggest learning about quantities, called invariants, that are independent of the frame of reference. In special relatiavity...
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Ppervect replied to the thread High School Traveling through space at zero km/s.That's correct. And in the context of special relativity, neither a material body nor a frame of reference can move at the speed of...
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Ppervect replied to the thread Undergrad Convention for writing $\binom{1}{1}$ tensors in matrix form?.I don't know if this is standard, but I think of a vector, in tensor notation written as ##u^a## as a column vector in matrix notion...
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Ppervect replied to the thread Undergrad Relational event horizons?.My $.02. Intuition is great, but - it's just not reliable. The only way to know if your intuition is correct or not is to look at the...
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Ppervect replied to the thread Undergrad EPR revisited.My understanding of quantum mechanics is not good. But I've been under the impression that "ordinary" quantum mechanics is not...
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Ppervect replied to the thread High School Am I understanding the concept of proper frame of reference?.I concur with Pallen's observations. MTW goes into the explicit geometric details of how to construct a proper frame of reference. And...
