Exact cosmological solutions of 4D string gravity in the string frameopen access
- Authors
- Yoon, Yongsung
- Issue Date
- May-2014
- Publisher
- ELSEVIER SCIENCE BV
- Citation
- NUCLEAR PHYSICS B, v.882, pp.219 - 228
- Indexed
- SCIE
SCOPUS
- Journal Title
- NUCLEAR PHYSICS B
- Volume
- 882
- Start Page
- 219
- End Page
- 228
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/143380
- DOI
- 10.1016/j.nuclphysb.2014.03.001
- ISSN
- 0550-3213
- Abstract
- We have discussed a particular class of exact cosmological solutions of the 4-dimensional low energy string gravity in the string frame. In the vacuum without matter and the 2-form fields, the exact cosmological solutions always give monotonically shrinking universes if the dilaton field is not a constant. However, in the presence of the 2-form fields and/or the radiation-like fluid in the string frame, the exact cosmological solutions show a minimum size of the universe in the evolution, but with an initial cosmological curvature singularity in the string frame.
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