Radial modes of pressure bumps and dips in astrophysical discs
Fuente:
arXiv
Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866914514132271104 |
|---|---|
| author | Leclerc, Armand Laibe, Guillaume Lynch, Elliot Perez, Nicolas |
| author_facet | Leclerc, Armand Laibe, Guillaume Lynch, Elliot Perez, Nicolas |
| contents | This study investigates the signatures of pressure extrema on global oscillations in discs. To this end, we use the framework of wave topology to establish a generalised local dispersion relation that includes pressure gradients. We highlight the influence of a previously unrecognized epicyclic-acoustic frequency and derive an analytical criterion for the existence of a branch of modes transiting between the inertial and the pressure bands. We find that pressure extrema consist of wave guides in which such topological modes propagate. The fundamental mode trapped at a pressure bump can propagate at all frequencies, allowing it to resonate with any temporal forcing, while the mode associated with a pressure gap propagates at a fixed frequency, propagates with arbitrary vertical phase velocity. These specific features make them attractive candidates for future discoseismology. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_05737 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Radial modes of pressure bumps and dips in astrophysical discs Leclerc, Armand Laibe, Guillaume Lynch, Elliot Perez, Nicolas Earth and Planetary Astrophysics Mesoscale and Nanoscale Physics Fluid Dynamics This study investigates the signatures of pressure extrema on global oscillations in discs. To this end, we use the framework of wave topology to establish a generalised local dispersion relation that includes pressure gradients. We highlight the influence of a previously unrecognized epicyclic-acoustic frequency and derive an analytical criterion for the existence of a branch of modes transiting between the inertial and the pressure bands. We find that pressure extrema consist of wave guides in which such topological modes propagate. The fundamental mode trapped at a pressure bump can propagate at all frequencies, allowing it to resonate with any temporal forcing, while the mode associated with a pressure gap propagates at a fixed frequency, propagates with arbitrary vertical phase velocity. These specific features make them attractive candidates for future discoseismology. |
| title | Radial modes of pressure bumps and dips in astrophysical discs |
| topic | Earth and Planetary Astrophysics Mesoscale and Nanoscale Physics Fluid Dynamics |
| url | https://arxiv.org/abs/2512.05737 |