Cosmological singularities in brane gravity
We present a comprehensive study of cosmological singularities within the framework of Covariant Extrinsic Gravity (CEG), addressing both the initial Big Bang singularity and potential finite-time future singularities. Through detailed analysis of the emergent universe scenario, we systematically ex...
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-08-01
|
| Series: | Nuclear Physics B |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0550321325001543 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1849322037375401984 |
|---|---|
| author | R. Jalalzadeh S. Jalalzadeh Y. Heydarzade |
| author_facet | R. Jalalzadeh S. Jalalzadeh Y. Heydarzade |
| author_sort | R. Jalalzadeh |
| collection | DOAJ |
| description | We present a comprehensive study of cosmological singularities within the framework of Covariant Extrinsic Gravity (CEG), addressing both the initial Big Bang singularity and potential finite-time future singularities. Through detailed analysis of the emergent universe scenario, we systematically examine homogeneous and inhomogeneous perturbations (encompassing scalar, vector, and tensor modes) in a 4D FLRW brane geometry. Our work establishes rigorous existence criteria and stability conditions for a nonsingular Einstein static initial state, demonstrating that such a configuration remains stable for well-defined parameter ranges in CEG – thereby providing a compelling resolution to the long-standing initial singularity problem. Extending our analysis to late-time cosmology, we perform a complete classification of future singularity types following Barrow et al.'s formalism, deriving precise conditions that determine whether the universe in CEG evolves toward or avoids these singular states. |
| format | Article |
| id | doaj-art-59bc10cbbfff465bae36ed05c340c94b |
| institution | Kabale University |
| issn | 0550-3213 |
| language | English |
| publishDate | 2025-08-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Nuclear Physics B |
| spelling | doaj-art-59bc10cbbfff465bae36ed05c340c94b2025-08-20T03:49:33ZengElsevierNuclear Physics B0550-32132025-08-01101711694510.1016/j.nuclphysb.2025.116945Cosmological singularities in brane gravityR. Jalalzadeh0S. Jalalzadeh1Y. Heydarzade2Department of Physics, University of Kurdistan, Pasdaran St., Sanandaj, IranDepartamento de Física, Universidade Federal de Pernambuco, Recife, 50670-901, PE, Brazil; Department of Physics, Dogus University, Dudullu-Ümraniye, Istanbul 34775, TurkeyDepartment of Mathematics, Faculty of Sciences, Bilkent University, Ankara, 06800, Turkey; Corresponding author.We present a comprehensive study of cosmological singularities within the framework of Covariant Extrinsic Gravity (CEG), addressing both the initial Big Bang singularity and potential finite-time future singularities. Through detailed analysis of the emergent universe scenario, we systematically examine homogeneous and inhomogeneous perturbations (encompassing scalar, vector, and tensor modes) in a 4D FLRW brane geometry. Our work establishes rigorous existence criteria and stability conditions for a nonsingular Einstein static initial state, demonstrating that such a configuration remains stable for well-defined parameter ranges in CEG – thereby providing a compelling resolution to the long-standing initial singularity problem. Extending our analysis to late-time cosmology, we perform a complete classification of future singularity types following Barrow et al.'s formalism, deriving precise conditions that determine whether the universe in CEG evolves toward or avoids these singular states.http://www.sciencedirect.com/science/article/pii/S0550321325001543 |
| spellingShingle | R. Jalalzadeh S. Jalalzadeh Y. Heydarzade Cosmological singularities in brane gravity Nuclear Physics B |
| title | Cosmological singularities in brane gravity |
| title_full | Cosmological singularities in brane gravity |
| title_fullStr | Cosmological singularities in brane gravity |
| title_full_unstemmed | Cosmological singularities in brane gravity |
| title_short | Cosmological singularities in brane gravity |
| title_sort | cosmological singularities in brane gravity |
| url | http://www.sciencedirect.com/science/article/pii/S0550321325001543 |
| work_keys_str_mv | AT rjalalzadeh cosmologicalsingularitiesinbranegravity AT sjalalzadeh cosmologicalsingularitiesinbranegravity AT yheydarzade cosmologicalsingularitiesinbranegravity |