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| bio | website | lightandmatter.com |
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| location | ||
| age | ||
| visits | member for | 1 year, 10 months |
| seen | 18 mins ago | |
| stats | profile views | 978 |
I teach physics at Fullerton College, a community college in Southern California. I have an undergrad degree in math and physics from Berkeley and a PhD in physics from Yale. Back when I was doing research, my field was experimental low-energy nuclear physics.
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Apr 28 |
revised |
Forces as One-Forms and Magnetism added 16 characters in body |
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Apr 28 |
revised |
Where 2 comes from in formula for Schwarzschild radius? deleted 1 characters in body |
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Apr 28 |
answered | Earliest example of naturalness/fine-tuning arguments |
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Apr 28 |
answered | Forces as One-Forms and Magnetism |
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Apr 28 |
comment |
Dependence of Friction on Area You need to distinguish between reality and models of reality. The textbook model of friction that you're referring to is called the Amonton model. It's only one of many models. It's fairly accurate in certain situations but not in other (e.g., a lubricated bearing). |
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Apr 28 |
answered | Why does the fundamental mode of a recorder disappear when you blow harder? |
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Apr 28 |
comment |
Rate of spontaneous tachyon emission You answer has some nice insights in it, but I don't think it addresses the question, which is about the rate at which this process occurs, i.e., the rate at which we observe an electron to undergo a spontaneous change in its energy and momentum. |
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Apr 26 |
asked | Rate of spontaneous tachyon emission |
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Apr 26 |
comment |
On the Aharonov-Bohm effect, and the reality of the classical fields I must be missing the point, because this seems obvious to me. A bathroom scale is a classical device that measures force, not work. A Hall effect sensor is a classical device that measures B, not flux. |
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Apr 26 |
awarded | Enthusiast |
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Apr 25 |
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Can something travel faster than light if it has always been travelling faster than light? It's not completely clear whether tachyons would violate causality. There are arguments to the contrary. See, e.g., E. Recami: “Tachyon kinematics and causality: A systematic thorough analysis of the tachyon causal paradoxes”, Foundations of Physics 17 (1987) 239-296, available at dinamico2.unibg.it/recami/scientific.htm |
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Apr 25 |
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General definition of an event horizon? @ChrisWhite: I think any observer-dependent statement can be reworded to make it observer-independent, simply by changing "I observe X" to "A hypothetical observer with such-and-such a world-line would observe X." A BH horizon is observer-dependent in the sense that it is a description of what distant observers can't see. Note that the horizon has no empirically detectable effect on observations made by an observer inside the horizon. |
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Apr 25 |
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General definition of an event horizon? deleted 54 characters in body |
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Apr 25 |
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General definition of an event horizon? Thanks for correcting my mistake about the dimensionality of $i^+$ versus $\mathscr{I}^+$. I'll edit the question to remove the mistake. But I don't think your answer addresses my question. |
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Apr 25 |
revised |
General definition of an event horizon? deleted 54 characters in body |
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Apr 25 |
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General definition of an event horizon? @MBN: Yes, that's what I mean. I'll edit the question to try to clarify. |
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Apr 25 |
asked | General definition of an event horizon? |
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Apr 25 |
revised |
Can we have a black hole without a singularity? added 103 characters in body |
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Apr 25 |
revised |
Can we have a black hole without a singularity? added 103 characters in body |
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Apr 25 |
answered | Can we have a black hole without a singularity? |
