pervect's latest activity
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Ppervect replied to the thread High School True static equilibrium and effects on time.You seem to be stuck on the idea that "time slows down". One can ask "Slows down relative to what? To me, your words suggest you...
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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...
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Ppervect reacted to PAllen's post in the thread High School Am I understanding the concept of proper frame of reference? with
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I found an explicit statement in this section of MTW (13.6 bottom of p. 331 in my edition) that makes clear that they have the meaning I... -
Ppervect replied to the thread High School Why is the constant speed of light so unique?.Measuring pressure is certainly possible. Even in Newtonian mechanics, pressure is only as simple as a single number when the pressure...
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Ppervect replied to the thread High School Why Do Events Freeze For Me at the Speed of Light?.You can't move at the speed of light, but it turns out you that relativity depicts what you describe. There's another way of saying...
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Ppervect replied to the thread High School Am I understanding the concept of proper frame of reference?.I barely said anything, but if you have a chance and ability to read the reference I cited, it's the best treatment of accelerated...
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Ppervect replied to the thread High School Am I understanding the concept of proper frame of reference?.It looks more like you are trying to understand the relationship between two inertial frames of reference rather than the concept of a...
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Ppervect replied to the thread Undergrad Question about Parallel Transport.I'm not doubting your word on this, but a reference would be handy.I thought "extremal" and "stationary" were synonyms. For an I level...
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Ppervect replied to the thread Undergrad Question about Parallel Transport.It's always safer (though less understandable) to say that geodesics (of the Levi-Civita connection) are extremal rather than maximums...
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Ppervect replied to the thread Undergrad Question about Parallel Transport.For a general way to get an intuitive feelings for geodesics that is not too advanced, I'll put in a plug for the "sector model"...