4,823 reputation
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bio website black-holes.org
location Ithaca, NY
age 35
visits member for 3 years, 2 months
seen 37 mins ago

I am a theoretical astrophysicist working mostly in relativity.


May
16
revised Momentum and spacetime
added 493 characters in body
May
16
awarded  Enlightened
May
16
awarded  Nice Answer
May
15
comment Momentum and spacetime
You're very welcome. (1) Refusing to ask questions is the deepest stupidity. (2) Anyone who would make you feel stupid for asking is only refusing to ask him/herself the question... which brings us back to (1). :)
May
15
revised Momentum and spacetime
added 557 characters in body
May
15
revised Momentum and spacetime
added 343 characters in body
May
15
answered Momentum and spacetime
May
5
answered Can you determine acceleration from positions and velocities only?
May
5
comment Can you determine acceleration from positions and velocities only?
Oh, bottom of page 1, I guess.
May
5
comment Can you determine acceleration from positions and velocities only?
Can you be more precise about where it says this, and maybe provide the quote along with context?
May
3
comment Solar Power Fusion
@CuriousOne Yes, but even my highly speculative readings of the question didn't stretch it as far as "use solar energy to start up ITER++"... The question seemed to me to be about direct energy transfer to cause fusion. I didn't assume a self-sustaining nuclear reaction or any confinement.
May
3
comment Solar Power Fusion
@pZombie I didn't say it couldn't be done. In fact, I showed one way to achieve fusion: use the energy to accelerate a single particle, and it can (potentially) fuse with another. Even using the sun, my calculation shows that you just need a small enough target.
May
2
answered Solar Power Fusion
Apr
30
revised Why is the zero of electric potential taken to be $r = \infty$, rather than $r = 0?$
added 533 characters in body
Apr
30
reviewed Approve Why can't I harness normal force?
Apr
29
answered Why is the zero of electric potential taken to be $r = \infty$, rather than $r = 0?$
Apr
17
comment Would we see the past if we look to a mirror 1 light year away?
possible duplicate of Will we ever be able to view the past?
Apr
17
revised Why is the “real” gauge group of the standard model $SU(3) \times SU(2) \times U(1) /N$?
added 543 characters in body
Apr
16
answered Why is the “real” gauge group of the standard model $SU(3) \times SU(2) \times U(1) /N$?
Apr
12
answered Books that develop interest & critical thinking among high school students