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Bulgarian Journal of Physics
Print: 1310-0157 Online: 1314-2666
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RECOGNIZED BY THE EUROPEAN PHYSICAL SOCIETY 
Bulg. J. Phys. vol.33 no.s1 (2006), pp. 360-367
Exact Solutions in w<−1 SFT Inspired Cosmological Models
I.Ya. Aref'eva1, A.S. Koshelev1, S.Yu. Vernov2
1Steklov Mathematical Institute, Russian Academy of Sciences, Gubkina st. 8, Moscow 119991, Russia
2Skobeltsyn Institute of Nuclear Physics, Moscow State University, Vorob'evy Gory, Moscow, 119992, Russia
go back1Steklov Mathematical Institute, Russian Academy of Sciences, Gubkina st. 8, Moscow 119991, Russia
2Skobeltsyn Institute of Nuclear Physics, Moscow State University, Vorob'evy Gory, Moscow, 119992, Russia
Abstract. Exact solutions to the Friedmann equations with a stringy inspired phantom field are constructed. The Universe is considered as a slowly decaying D3-brane, which is described in the string field theory (SFT) framework. The D3-brane dynamics is approximately described by a nonlocal string tachyon interaction and the back reaction of gravity is incorporated in the closed string tachyon dynamics. In a local effective approximation this model contains one phantom component and one usual scalar field. The notable feature of this model is a ghost sign of the kinetic term of the phantom scalar field. We find explicit solutions with the Dark Energy state parameter wDE reaching the barrier wDE=-1 from below at large time.