Tachyonic (phantom) power-law cosmology

Rangdee, Phongsaphat; Gumjudpai, Burin

doi:10.1007/s10509-013-1680-2

Cited by 11 publications

(11 citation statements)

References 69 publications

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“…(16)- (19) we found the two species of tachyon fields, as in [18], the phantom tachyon Eqs. (20) with a γ < 0 and the complementary tachyon Eqs. (21) and (22) with 1 < γ.…”

Section: The Extended Tachyon Cosmologymentioning

confidence: 99%

Extended tachyon field using form invariance symmetry

Sánchez

Iván²

2014

Phys. Rev. D

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In this work we illustrate how form-invariance transformations (FIT) can be used to construct phantom and complementary tachyon cosmologies from standard tachyon field universes. We show how these transformations act on the Hubble expansion rate, the energy density, and pressure of the tachyon field. The FIT generate new cosmologies from a known "seed" one, in particular from the ordinary tachyon field we obtain two types of tachyon species, denominated phantom and complementary tachyon. We see that the FIT allow us to pass from a non-stable cosmology to a stable one and vice-versa, as appeared in the literature. Finally, as an example, we apply the transformations to a cosmological fluid with an inverse square potential, V ∝ φ −2 , and generate the extended tachyon field.

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“…(16)- (19) we found the two species of tachyon fields, as in [18], the phantom tachyon Eqs. (20) with a γ < 0 and the complementary tachyon Eqs. (21) and (22) with 1 < γ.…”

Section: The Extended Tachyon Cosmologymentioning

confidence: 99%

Extended tachyon field using form invariance symmetry

Sánchez

Iván²

2014

Phys. Rev. D

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“…Several works have found the exact solutions for the tachyon field [19,20]. Generalizing the ideas obtained in these works, we study the equations of motion by specifying the linear dependence of the tachyon field on the cosmological time…”

Section: Solutionmentioning

confidence: 95%

“…The standard tachyon can behave as an inflaton field in early epoch, and like matter in late epoch.The phantom tachyon field provides rapid expansion and its energy density is gradually increasing. The complementary tachyon field always plays the role of matter [7,[18][19][20]. In the work [16] was illustrated, that a standard tachyon field, after applying a form invariance symmetry to it, can generate a complementary tachyon field and a phantom tachyon field.…”

Section: Introductionmentioning

confidence: 99%

Analysis cosmological tachyon and fermion model and observation data constraints

Tsyba,

Razina,

Suikimbayeva

2021

Preprint

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In this work we investigate a cosmological model with the tachyon and fermion fields with barotropic equation of state, where pressure p, energy density ρ and barotropic index γ are related by the relation p = (γ − 1)ρ. We applied the tachyonozation method which allows to consider cosmological model with the fermion and the tachyon fields, driven by special potential. In this paper, tachyonization model was defined from the stability analysis and exact solution standard of the tachyon field. Analysis of the solution via statefinder parameters illustrated that our model in fiducial points with deceleration parameter q = 0.5 and statefinder r = 1 which corresponds to the matter dominated universe (SCDM) but, ends its evolution at a point in the future (q = −1, r = 1) which corresponds to the de-Sitter expansion. Comparison of the model parameters with the cosmological observation data demonstrate, that our proposed cosmological model is stable at barotropic index γ0 = 0.00744.

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“…In this section, C i will denote integration constants, for example, here C 1 , C 4 denotes the integration constants. It is also possible to consider a different kind of power law [51,52],…”

Section: Cosmological Modelsmentioning

confidence: 99%

“…We now consider the second scale factor considered in this work, which is another form of the power law [51,52], a (t) = a 0 (t s − t) −n , (8.29) where n > 0 and t < t s . Here a 0 is the present day value of a(t), while t s is the probable future singularity at finite time.…”

Section: Appendixmentioning

confidence: 99%

Cosmological reconstruction andOmdiagnostic analysis of Einstein-Aether theory

Pasqua

Chattopadhyay²,

Momeni

et al. 2017

J. Cosmol. Astropart. Phys.

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Abstract. In this paper, we will analyse the cosmological models in Einstein-aether gravity, which is a modified theory of gravity in which a time-like vector field breaks the Lorentz symmetry. We will use this formalism to analyse different cosmological models with different behavior of the scale factor. In this analysis, we will use a certain functional dependence of the dark energy on the Hubble parameter. It will be demonstrated that the aether vector field has a non-trivial effect on these cosmological models. We will also perform the Om diagnostic in Einstein-aether gravity. Thus, we will fit parameters of the cosmological models using recent observational data.

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Tachyonic (phantom) power-law cosmology

Cited by 11 publications

References 69 publications

Extended tachyon field using form invariance symmetry

Extended tachyon field using form invariance symmetry

Analysis cosmological tachyon and fermion model and observation data constraints

Cosmological reconstruction andOmdiagnostic analysis of Einstein-Aether theory

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