Timeline for What is pion condensation (or hadron condensation in general)?
Current License: CC BY-SA 4.0
7 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jan 24 at 21:14 | vote | accept | ersbygre1 | ||
| May 21, 2021 at 6:04 | history | bounty ended | CommunityBot | ||
| May 18, 2021 at 1:52 | comment | added | user200143 | In neutron stars the temperature is low compared to the fermi energy, so new equilibrium phases at high density need to lower the energy. This requires something attractive. A phase transition has discontinuous derivatives of the free energy. A first order transition has the entropy discontinuous and a latent heat across the transition. A crossover is like going from a liquid to a gas above the critical point where there is no place that the derivatives are discontinuous. An example of an s-wave interaction would be one proportional to the pion field or density. | |
| May 17, 2021 at 9:52 | comment | added | ersbygre1 | I've thought about your answer for a bit, and I'd like to ask some more follow-up questions: 1) is the attractiveness of the πN interaction the necessary condition for the pions to get massless (or zero chemical potential)? 2) Could you please elaborate on the difference between phase transition and cross over? Why should the compressibility of neutron stars change? 3) What would an s-wave interaction look like? Is it also attractive? | |
| May 14, 2021 at 19:08 | comment | added | user200143 | Yes the usual interaction is p-wave. | |
| May 14, 2021 at 1:02 | comment | added | ersbygre1 | If the πN coupling involves a pion derivative (and therefore a pion momentum), isn't it always a p-wave interaction? | |
| May 13, 2021 at 17:39 | history | answered | user200143 | CC BY-SA 4.0 |