The Birth of a Ghost Star
We present a model of an evolving spherically symmetric dissipative self-gravitating fluid distribution which tends asymptotically to a ghost star, meaning that the end state of such a system corresponds to a static fluid distribution with a vanishing total mass and an energy density distribution wh...
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-04-01
|
| Series: | Entropy |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1099-4300/27/4/412 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850183439273164800 |
|---|---|
| author | Luis Herrera Alicia Di Prisco Justo Ospino |
| author_facet | Luis Herrera Alicia Di Prisco Justo Ospino |
| author_sort | Luis Herrera |
| collection | DOAJ |
| description | We present a model of an evolving spherically symmetric dissipative self-gravitating fluid distribution which tends asymptotically to a ghost star, meaning that the end state of such a system corresponds to a static fluid distribution with a vanishing total mass and an energy density distribution which is negative in some regions of the fluid. The model was inspired by a solution representing a fluid evolving quasi-homologously and with a vanishing complexity factor. However, in order to satisfy the asymptotic behavior mentioned above, the starting solution had to be modified, as a consequence of which the resulting model only satisfies the two previously mentioned conditions asymptotically. Additionally, a condition on the variation in the infinitesimal proper radial distance between two neighboring points per unit of proper time was imposed, which implies the presence of a cavity surrounding the center. Putting together all these conditions, we were able to obtain an analytical model depicting the emergence of a ghost star. Some potential observational consequences of this phenomenon are briefly discussed in the last section. |
| format | Article |
| id | doaj-art-9284aa105fa040279351bd4cca5d4f6a |
| institution | OA Journals |
| issn | 1099-4300 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Entropy |
| spelling | doaj-art-9284aa105fa040279351bd4cca5d4f6a2025-08-20T02:17:20ZengMDPI AGEntropy1099-43002025-04-0127441210.3390/e27040412The Birth of a Ghost StarLuis Herrera0Alicia Di Prisco1Justo Ospino2Instituto Universitario de Física Fundamental y Matemáticas, Universidad de Salamanca, 37007 Salamanca, SpainEscuela de Física, Facultad de Ciencias, Universidad Central de Venezuela, Caracas 1050, VenezuelaDepartamento de Matemática Aplicada and Instituto Universitario de Física Fundamental y Matemáticas, Universidad de Salamanca, 37007 Salamanca, SpainWe present a model of an evolving spherically symmetric dissipative self-gravitating fluid distribution which tends asymptotically to a ghost star, meaning that the end state of such a system corresponds to a static fluid distribution with a vanishing total mass and an energy density distribution which is negative in some regions of the fluid. The model was inspired by a solution representing a fluid evolving quasi-homologously and with a vanishing complexity factor. However, in order to satisfy the asymptotic behavior mentioned above, the starting solution had to be modified, as a consequence of which the resulting model only satisfies the two previously mentioned conditions asymptotically. Additionally, a condition on the variation in the infinitesimal proper radial distance between two neighboring points per unit of proper time was imposed, which implies the presence of a cavity surrounding the center. Putting together all these conditions, we were able to obtain an analytical model depicting the emergence of a ghost star. Some potential observational consequences of this phenomenon are briefly discussed in the last section.https://www.mdpi.com/1099-4300/27/4/412relativistic fluidsinterior solutionsspherically symmetric sources |
| spellingShingle | Luis Herrera Alicia Di Prisco Justo Ospino The Birth of a Ghost Star Entropy relativistic fluids interior solutions spherically symmetric sources |
| title | The Birth of a Ghost Star |
| title_full | The Birth of a Ghost Star |
| title_fullStr | The Birth of a Ghost Star |
| title_full_unstemmed | The Birth of a Ghost Star |
| title_short | The Birth of a Ghost Star |
| title_sort | birth of a ghost star |
| topic | relativistic fluids interior solutions spherically symmetric sources |
| url | https://www.mdpi.com/1099-4300/27/4/412 |
| work_keys_str_mv | AT luisherrera thebirthofaghoststar AT aliciadiprisco thebirthofaghoststar AT justoospino thebirthofaghoststar AT luisherrera birthofaghoststar AT aliciadiprisco birthofaghoststar AT justoospino birthofaghoststar |