记者走访调查市区20多条主要道路 多条道路“缺绿”
Current License: CC BY-SA 4.0
8 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| 15 hours ago | history | became hot network question | |||
| 18 hours ago | comment | added | KP99 | Thank you for the explanation | |
| 18 hours ago | vote | accept | KP99 | ||
| 21 hours ago | comment | added | Abezhiko | All the modes exist from the start, since the light Hamiltonian is given by $\sum_{\mathbf{k}} \hbar\omega_\mathbf{k}\hat{a}_\mathbf{k}^\dagger\hat{a}_\mathbf{k}$, even if the modes $\mathbf{k} \neq \mathbf{k}_0$ are not populated initially. Moreover, note that this model doesn't aim to conserve energy but the total population $\hat{N} = \hat{\sigma}^\dagger\hat{\sigma} + \sum_{\mathbf{k}} \hat{a}_\mathbf{k}^\dagger\hat{a}_\mathbf{k}$ only. | |
| 22 hours ago | answer | added | Ján Lalinský | timeline score: 4 | |
| 22 hours ago | comment | added | KP99 | well that can be argued on physical ground, but it is not considered in the expression of hamiltonian. Just from the structure of hamiltonian itself, how do I explain the extra k modes? | |
| 22 hours ago | comment | added | Abezhiko | The energy balance is compensated mainly by phonons (i.e. heat). | |
| 23 hours ago | history | asked | KP99 | CC BY-SA 4.0 |