The Evolution of Universe with th B-I Type Phantom Scalar Field

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dc.creatorFang, Wei
dc.creatorLu, H. Q.
dc.creatorHuang, Z. G.
dc.creatorZhang, K. F.
dc.date2004-09-07
dc.date2005-07-15
dc.date.accessioned2026-07-07T06:29:13Z
dc.date.available2026-07-07T06:29:13Z
dc.descriptionWe considered the phantom cosmology with a lagrangian $\displaystyle L=\frac{1}η[1-\sqrt{1+ηg^{μν}ϕ_{, μ}ϕ_{, ν}}]-u(ϕ)$, which is original from the nonlinear Born-Infeld type scalar field with the lagrangian $\displaystyle L=\frac{1}η[1-\sqrt{1-ηg^{μν}ϕ_{, μ}ϕ_{, ν}}]-u(ϕ)$. This cosmological model can explain the accelerated expansion of the universe with the equation of state parameter $w\leq-1$. We get a sufficient condition for a arbitrary potential to admit a late time attractor solution: the value of potential $u(X_c)$ at the critical point $(X_c,0)$ should be maximum and large than zero. We study a specific potential with the form of $u(ϕ)=V_0(1+\fracϕ{ϕ_0})e^{(-\fracϕ{ϕ_0})}$ via phase plane analysis and compute the cosmological evolution by numerical analysis in detail. The result shows that the phantom field survive till today (to account for the observed late time accelerated expansion) without interfering with the nucleosynthesis of the standard model(the density parameter $Ω_ϕ\simeq10^{-12}$ at the equipartition epoch), and also avoid the future collapse of the universe.
dc.description17 pages, 10 figures,typos corrected, references added,figures added and enriched, title changed, main result remained
dc.identifierhttps://arxiv.org/abs/hep-th/0409080
dc.identifierhttp://arxiv.org/abs/hep-th/0409080
dc.identifierInt.J.Mod.Phys. D15 (2006) 199-214
dc.identifierdoi:10.1142/S0218271806008231
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/97953
dc.subjectHigh Energy Physics - Theory
dc.subjectAstrophysics
dc.titleThe Evolution of Universe with th B-I Type Phantom Scalar Field
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