1,094 reputation
312
bio website home.gwu.edu/~mparis
location Santa Fe, NM
age 44
visits member for 2 years, 1 month
seen Sep 29 at 2:06

Nuclear physics, theory


Sep
4
awarded  Yearling
Mar
28
awarded  Enlightened
Mar
28
awarded  Nice Answer
Mar
27
answered Angular Momentum Operator in Quantum Field Theory
Mar
19
answered Internuclear Binding Force: Experimental geometric detail
Feb
28
comment Neutrinos and anti-neutrinos in the Standard Model
You're right. It should have been "2) No.". Thanks.
Feb
27
comment Neutrinos and anti-neutrinos in the Standard Model
I mentioned this. Please reread the final sentence. I agree that it's somewhat cryptic.
Feb
27
answered Neutrinos and anti-neutrinos in the Standard Model
Feb
27
answered How to calculate critical temperature of the Ising model?
Jan
24
comment Propagator and expectation value
If you have the propagator then you know all of the eigenstates of the potential. See L. Brown's book, Quantum Field Theory, first chapter, section 1.5. Armed with this, you can devise a way to this calculation.
Jan
24
comment Diagonalize a dot product with Pauli matrices
You can use some notes I wrote for advanced high school or undergraduates to work through this problem yourself. A pdf version of the notes is here: public.lanl.gov/mparis/qmp.pdf -- And the relevant section with exercise problems start on page 32, section 5 of chapter 2.
Nov
17
comment Baryon masses in Wetterich's new cosmology
I have. You're still wrong.
Nov
15
comment Baryon masses in Wetterich's new cosmology
-1: From the abstract: "We discuss a cosmological model where the universe shrinks rather than expands during the radiation and matter dominated periods."
Oct
29
comment Momentum representation of a function with discontinuous derivative
Hi Artemisia - yes, the paper you cite is relevant. But it is also fairly complicated. Why don't you do two things: 1) Compute the derivative of your wave function for two limits: $\lim_{x\to 0^\pm}$. 2) Follow the advice of David Z, above, and show some of your work. Best of luck.
Oct
29
revised Normalization of the real Klein Gordon Field in Peskin and Schroeder chapter 2
corrected normalization in second to last equation
Oct
29
comment Normalization of the real Klein Gordon Field in Peskin and Schroeder chapter 2
You're right about Eq.(2.38). I made a mistake -- it should have been $a^\dagger_{\Lambda\mathbf{p}} = \sqrt{ \frac{E_{\mathbf{p}}}{E_{\Lambda\mathbf{p}}} } U(\Lambda)a^\dagger_{\mathbf{p}}U^\dagger(\Lambda)$. And the way you've convinced yourself is essentially the proof.
Oct
29
comment Does GR imply a fundamental difference between gravitational and non-gravitational acceleration?
I edited the answer. I think the remainder is correct now. I'm sure I'll be informed in a smarmy way if not.
Oct
29
comment Does GR imply a fundamental difference between gravitational and non-gravitational acceleration?
Yes - you're completely correct. Thanks for righting that egregious error. Some things you know and forget. Some things you don't know you never knew.
Oct
29
revised Does GR imply a fundamental difference between gravitational and non-gravitational acceleration?
removed erroneous junk
Oct
28
answered Does GR imply a fundamental difference between gravitational and non-gravitational acceleration?