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A Tachyonic Scalar Field with Mutually Interacting Components

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Abstract

We investigate the tachyonic cosmological potential V(ϕ) in two different cases of the quasi-exponential expansion of universe and discuss various forms of interaction between the two components—matter and the cosmological constant—of the tachyonic scalar field, which lead to the viable solutions of their respective energy densities. The distinction among the interaction forms is shown to appear in the O m (x) diagnostic. Further, the role of the high- and low-redshift observations of the Hubble parameter is discussed to determine the proportionality constants and hence the correct form of matter–cosmological constant interaction.

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Notes

  1. Even though the present supernovae observations [1, 2] seem to indicate an accelerated expansion of the universe, yet the exact form of the expansion has still not been unambiguously ascertained. It is possible that we have already entered another inflationary phase.

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Acknowledgements

The authors are thankful to the University Grants Commission, New Delhi for its support for the present work through the Major Research Project vide F. No. 37-431/2009 (SR).

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Authors and Affiliations

  1. Department of Physics, Lucknow University, Lucknow, 226 007, India

    Murli Manohar Verma & Shankar Dayal Pathak

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  1. Murli Manohar Verma
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  2. Shankar Dayal Pathak
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Correspondence to Murli Manohar Verma.

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Verma, M.M., Pathak, S.D. A Tachyonic Scalar Field with Mutually Interacting Components. Int J Theor Phys 51, 2370–2379 (2012). https://doi.org/10.1007/s10773-012-1116-8

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