Dynamics of scalar fields from a generalized form of Lagrangian
Issued Date
2025-09-01
Resource Type
ISSN
05503213
Scopus ID
2-s2.0-105009626751
Journal Title
Nuclear Physics B
Volume
1018
Rights Holder(s)
SCOPUS
Bibliographic Citation
Nuclear Physics B Vol.1018 (2025)
Suggested Citation
Kaur J., Pathak S.D., Khlopov M., Krasnov M., Sharma M. Dynamics of scalar fields from a generalized form of Lagrangian. Nuclear Physics B Vol.1018 (2025). doi:10.1016/j.nuclphysb.2025.117010 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/111161
Title
Dynamics of scalar fields from a generalized form of Lagrangian
Author(s)
Corresponding Author(s)
Other Contributor(s)
Abstract
Scalar fields play a crucial role in Einstein's field equations, describing both the early- and late-time phenomenology of the universe. Despite numerous Lagrangians with distinct implications, a unified model has been lacking. We propose a generalized Lagrangian with two parameters, α and β, that encompasses quintessence, phantom, and tachyon fields. This framework captures their canonical dynamics, derives the background equations, and facilitates studies of cosmic evolution. Using the O<inf>m</inf>(z) diagnostic, we distinguish the evolutionary patterns of these fields from those of the cosmological constant, demonstrating smooth transitions between different behaviors. This cohesive structure enhances our understanding of dark energy and cosmic expansion, bridging theoretical versatility with observational constraints.