18,797 reputation
14098
bio website lightandmatter.com
location Fullerton, California
age
visits member for 3 years
seen 2 days ago

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.


Oct
24
comment Does a black hole have an interior or does the spacetime manifold itself end at the event horizon?
@dcgeorge: You're confused re $m\propto r$. You can clear this up for yourself by looking it up in a reliable source.
Oct
24
comment Why are all basic physical measurements ratios?
But a unitless measurement doesn't have to be a ratio. For example, I can count that I have five apples in a bag.
Oct
23
comment How many worlds does the world split into in the Many Worlds Interpretation?
possible duplicate of Many-worlds: how often is the split how many are the universes? (And how do you model this mathematically.)
Oct
23
revised Intuitive understanding of the entropy equation
deleted 14 characters in body
Oct
23
comment Intuitive understanding of the entropy equation
I don't think this addresses the question. The question is about why we can't redefine temperature through an arbitrary one-to-one function. Nothing you've said in this answer rules out such a redefinition.
Oct
23
answered Intuitive understanding of the entropy equation
Oct
23
comment Intuitive understanding of the entropy equation
related: physics.stackexchange.com/q/48497
Oct
23
comment Intuitive understanding of the definition of entropy
@Trimok: The dimensionlessness of $S/k$ can't be used to infer the exponent of $T$. If we redefined a bunch of stuff, we might just end up with $k$ having different units.
Oct
23
comment Can universal continuity be experimentally falsified?
IMO it is not a good idea to ask for an answer "drawing from credible and/or official sources" when the question itself represents a hazy idea that hasn't yet been developed fully.
Oct
23
comment Truck Mass & “4th power law”
Exponents like this should not be taken too seriously. They are typically found by making a log-log plot, finding its slope, and looking for a nearby integer, ratio of small integers, etc. It tends to be extremely difficult to determine the exponent with good precision unless the power law is really accurate and the experiment is really accurate.
Oct
23
comment Intuitive understanding of the definition of entropy
@maple: That would be a cool question to ask separately. If you ask it, I'll upvote and see if I can give a good answer.
Oct
23
answered Intuitive understanding of the definition of entropy
Oct
23
comment The definition of entropy
Here's my own explanation: lightandmatter.com/html_books/0sn/ch05/ch05.html#Section5.3
Oct
22
awarded  Nice Answer
Oct
22
answered Tensor contra- and covariance concept
Oct
22
comment Tensor contra- and covariance concept
I would say that this is a mathematical interpretation, not a physical one.
Oct
22
comment How do you prove the second law of thermodynamics from statistical mechanics?
If I was looking for a loophole or a way to avoid the Loschmidt argument, one possible place to look would be some kind of spontaneous symmetry breaking. Possibly relevant: arxiv.org/abs/1011.4173v5
Oct
22
answered Does a black hole have an interior or does the spacetime manifold itself end at the event horizon?
Oct
21
comment Victorian cosmology after the second law of thermodynamics but before relativity?
@AlanSE: The line of thought I'm interested in is basically the hypothetical one where they don't inadvertently infer the wrong things from stuff they didn't actually know about. E.g., they say, "we don't know the source of the sun's energy." The thing about the second law of thermodynamics is that it's much more fundamental than any such consideration.
Oct
21
answered Time dilation only on electromagnetic force?