7,190 reputation
22259
bio website astro.uvic.ca/~koman
location Canada
age 26
visits member for 2 years, 7 months
seen yesterday

I am an astrophysics graduate student.


2d
comment can a really loud sound travel in space?
Sound waves in the early Universe: en.wikipedia.org/wiki/Baryon_acoustic_oscillations
Mar
11
comment Fate of largest scale structures?
@Jim I'm not sure I follow that... $\dot{a}$(t) approaching 0 means the universe is expanding arbitrarily slowly, not approaching $c$, no? And as expansion proceeds, the density is dropping, so I don't see any reason you'd end up with a global black hole scenario like you describe? Maybe I'm missing what you're saying, can you flesh that out into an answer?
Mar
11
comment Fate of largest scale structures?
@JimdalftheGrey I have heard of Jeans length/mass, but I suspect that starts to break down when the dynamics of the system are approaching the relativistic limit. And I'm asking for... I guess LCDM without the L is a good description. Basically assume the Universe stays matter dominated for a long time instead of switching to $\Lambda$-dominated.
Mar
11
comment Missing Matter Problem and Galactic Kinematics
This answer has some glaring lack of referencing, which I will correct as soon as I have time, hopefully tomorrow.
Mar
11
answered Missing Matter Problem and Galactic Kinematics
Mar
10
reviewed Approve How big is a nuclear reactor pressure vessel?
Mar
9
comment When might ground reaction force be greater than expected?
Greater than expected from what?
Mar
9
reviewed Close what’s the water pressure at the surface of earth in Kpa?
Mar
9
reviewed Leave Open Electric current $j^{\mu}$ in standard QED vs. scalar QED
Mar
9
reviewed Leave Open Why can one see the outline of a white sheet of paper kept on another white sheet of paper?
Mar
9
reviewed Leave Open Approximations of the kind $x \ll y$
Mar
9
reviewed Close writing wave function of a spinor having a spin component
Mar
9
reviewed Close How much information does the Hamiltonian contain in quantum mechanics?
Mar
9
reviewed Close Mathematical formula for hysteresis
Mar
9
reviewed Leave Open Spin operator eigenstate in Fock space
Mar
9
reviewed Close Calculating Hall Effect in Semiconductors Without the Hole Convention
Mar
9
reviewed Close Why are there only 11 dimensions in M-theory?
Mar
9
reviewed Close Nuclear orbitals for nucleons
Mar
9
reviewed Leave Open Intuition for Homological Mirror Symmetry
Mar
9
reviewed Close Non-conservative Derivation of Lagrangian