1,770 reputation
616
bio website math.berkeley.edu/~cgerig
location UC Berkeley
age 26
visits member for 3 years, 4 months
seen 15 hours ago

After doing my BS in engineering physics, I started my PhD in experimental atomic physics. But I quit to do math, and am now a 3rd year student of Michael Hutchings.

I greatly thank Allen Hatcher for his recommendation letter which pulled me into college, after learning algebraic topology through his book in high school.


Feb
28
comment Can you put a magnetic ball into a hollow magnetic sphere?
Your statement "If the search for magnetic monopoles ever turns up something, then it will confirm that such a sphere can exist" is false. Monopoles have nothing to do with building a sphere -- the sphere consists of dipoles, and there is no way to create a monopole from a collection of dipoles.
Feb
17
answered When does Pauli's exclusion principle kick in?
Nov
30
answered Mathematical subtlety in a physics problem
Nov
14
awarded  Yearling
Oct
8
answered Visible light and colors
Oct
8
comment Visible light and colors
@ZhengLiu (and @Ignacio), if you read carefully, he is not asking about the misleading-ness of the coloring-label for quarks. He is using this to motivate the explicitly stated question.
Oct
2
comment Classical Hamiltonian involving product of factors whose quantum analogues don't commute
@Qmechanic, sorry that example is due to working in curvilinear coordinates. I should've clarified that I am considering flat Cartesian coordinates (as stated in Dirac's remark, though I didn't write it while paraphrasing).
Oct
1
revised Classical Hamiltonian involving product of factors whose quantum analogues don't commute
Added relevant article and explicit Hamiltonian
Oct
1
accepted Classical Hamiltonian involving product of factors whose quantum analogues don't commute
Oct
1
suggested approved edit on Classical Hamiltonian involving product of factors whose quantum analogues don't commute
Oct
1
comment Classical Hamiltonian involving product of factors whose quantum analogues don't commute
...What is your elementary system / Hamiltonian? It can't be just $\hat{K}$ because that is a free particle, and subsequently this is irrelevant to the question!
Oct
1
revised Classical Hamiltonian involving product of factors whose quantum analogues don't commute
edited title
Sep
30
comment Classical Hamiltonian involving product of factors whose quantum analogues don't commute
This doesn't answer my question at all. I know what the problem is; and the last paragraph cheats in a way (it's not in the spirit of Dirac's remark).
Sep
30
comment Classical Hamiltonian involving product of factors whose quantum analogues don't commute
@EmilioPisanty, I did not misread it at all. I'm asking for examples of systems where this "rare existence" arises.
Sep
30
revised Classical Hamiltonian involving product of factors whose quantum analogues don't commute
added 130 characters in body
Sep
30
asked Classical Hamiltonian involving product of factors whose quantum analogues don't commute
Sep
25
comment Black Holes can't exist?
No, it is flawed just like every other attempt in the past. Read Unruh's official response here: iflscience.com/physics/…
Jun
22
answered Special relativity and imaginary coefficient of the time coordinate
Apr
13
comment Simple & intuitive explanation of superfluidity?
physics.stackexchange.com/q/76578
Apr
1
awarded  Nice Answer