Activity for Volpinaâ€
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Edit | Post #288293 | Initial revision | — | 11 months ago |
| Question | — |
Understand intuitively 4th boundary condition of gravitational wave Suppose we have a gravitational wave which obeys the equation: $[G{tt}-c^{2}G{xx}]h{\mu\nu}=0$ Lets take the case where $h{\mu\nu}\ne0$ so we are left with the classical wave equation.Suppose for simplicity that the gravitational wave has a wavelength of 1m so we get the following boundary cond... (more) |
— | 11 months ago |
| Edit | Post #288288 |
Post edited: |
— | 11 months ago |
| Edit | Post #288288 | Initial revision | — | 11 months ago |
| Question | — |
How are gravitational waves derived? Gravitational waves can be derived from the non-linear Einstein field equations and since they are by definition waves they must obey the wave equation: $u{tt}=c^{2}u{xx}$ but in General Relativity time and space are not fixed so how are $t$ and $x$ defined for a gravitational wave? (more) |
— | 11 months ago |
| Comment | Post #288251 |
Just suppose we solve this problem as boundary condition problem,not by just solving the ODE in the "simplest" way (more) |
— | 11 months ago |
| Edit | Post #288251 |
Post edited: |
— | 11 months ago |
| Edit | Post #288251 |
Post edited: |
— | 11 months ago |
| Edit | Post #288251 | Initial revision | — | 11 months ago |
| Question | — |
What do eigenfunctions and eigenvalues mean physically? Lets say we have a mass connected to a spring.Assuming not any friction the ODE which describes the system is $m\frac{d^{2}x}{dt^{2}} = -kx$ We can set 2 Dirichlet boundary conditions $x(0)=0$ and $x(c)=0$ where $c$ will depend on $k,m$ If we solve the boundary condition problem we end up w... (more) |
— | 11 months ago |