meta user
network profile
| bio | website | |
|---|---|---|
| location | Williston, Florida | |
| age | 32 | |
| visits | member for | 1 year, 2 months |
| seen | Apr 23 at 22:10 | |
| stats | profile views | 27 |
|
Mar 22 |
awarded | Yearling |
|
Dec 4 |
answered | Quantum uncertainty of particle falling in black hole |
|
Jun 26 |
comment |
In what sense is SUSY a spacetime symmetry? It's not necessarily true that the exponential of a susy generator terminates at the first term; it depends on how many components of the susy generator there are. In 4d with N=1 susy, the series terminates at fourth order. Also, in the comment above, acting with the exponential of a susy generator doesn't merely shift theta, it also changes x. See Chapter 4 of Wess and Bagger. The susy generators contain a theta derivative and a P term. |
|
Jun 12 |
comment |
Direct observations of a black hole? Just a note: The even horizon doesn't necessarily have a strong gravitational field, so we can apply GR without having to extrapolate to regimes where new physics are required. |
|
Jun 6 |
awarded | Revival |
|
Apr 15 |
answered | What is currently incomplete in M-theory? |
|
Apr 14 |
comment |
Fluid Mechanics from a variational principle A nice lagrangian treatment is available for incompressible potential flows with hydrostatic pressure, or for flows allowing one component of vorticity. Also, for a general Hamiltonian description one may resort to Clebsch variables, and then define the resultant lagrangian from these. One can check out some of Zakharov's reviews on the subject. |
|
Apr 8 |
answered | Is dark matter really matter? |
|
Apr 8 |
answered | Is existence of cosmic dark energy falsifiable yet? |
|
Apr 6 |
answered | Is acceleration relative? |
|
Apr 5 |
revised |
A simple pendulum moving at a relativistic speed - how does the period change? Made some corrections in light of the the detailed calculation of the other answer. |
|
Apr 5 |
answered | Why can't we know the speed, $\vec{v}(t)$, and position, $\vec{r}(t)$, of an electron (the two) at the same time $t$? |
|
Apr 4 |
answered | Microwave oven + water: dielectric heating or ion drag? |
|
Apr 4 |
answered | Are we inside a black hole? |
|
Apr 4 |
awarded | Supporter |
|
Apr 4 |
comment |
A simple pendulum moving at a relativistic speed - how does the period change? Okay, I concur with Alexey's answer below. You really can't get the pendulum's period just by considering the change in the density, this was just laziness. A full calculation seems necessary, verbal hand waving won't suffice. |
|
Apr 4 |
answered | Can dark matter and energy be formulated as local perturbations of the metric |
|
Apr 4 |
answered | Why doesn't dark energy vary with time? |
|
Apr 4 |
awarded | Editor |
|
Apr 4 |
revised |
A simple pendulum moving at a relativistic speed - how does the period change? Addressed question 2. |
