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Crossing of the w=-1 Barrier by D3-brane Dark Energy Model

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arxiv astro-ph/0507067 v2 pith:MGLXHDJ2 submitted 2005-07-04 astro-ph gr-qchep-phhep-th

I.Ya. Aref'eva , A.S. Koshelev , S.Yu. Vernov This is my paper · ORCID
classification astro-phgr-qchep-phhep-th
keywords barrierd3-branedarkenergycosmologicalcrossingdynamicsinteraction
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We explore a possibility for the Universe to cross the w=-1 cosmological constant barrier for the dark energy state parameter. We consider the Universe as a slowly decaying D3-brane. The D3-brane dynamics is approximately described by a nonlocal string tachyon interaction and a 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 field with a simple polynomial interaction. To understand cosmological properties of this system we study toy models with the same scalar fields but with modified interactions. These modifications admit polynomial superpotentials. We find restrictions on these interactions under which it is possible to reach w=-1 from below at large time. Explicit solutions with the dark energy state parameter crossing/non-crossing the barrier w=-1 at large time are presented.

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Cited by 3 Pith papers

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  1. Covariant phase space and $L_\infty$ algebras

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    A covariant phase space symplectic form is constructed for any L∞ Lagrangian field theory using a 'sigmoid' operator, and is verified in scalar, Yang-Mills, general relativity, and p-adic string examples.

  2. Effective Phantom Dark Energy: What Cosmological Reconstruction Does and Does Not Imply

    astro-ph.CO 2026-05 unverdicted novelty 3.0 of 10

    Effective phantom dark energy is a background-level reconstruction that does not imply fundamental pathologies such as ghost instabilities or null energy condition violation by the underlying stress tensor.

  3. Modified Gravity Theories on a Nutshell: Inflation, Bounce and Late-time Evolution

    gr-qc 2017-05 accept novelty 2.0 of 10

    Modified gravity theories supply viable mathematical frameworks for inflation, bounces, and dark energy eras that match observational data.

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