The Gravitating Perfect Fluid-Scalar Field Equations: Quintessence and Tachyonic Matter

DeBenedictis, Andrew; Das, A.; Kloster, S.

doi:10.1023/b:gerg.0000046834.79815.3f

Cited by 20 publications

(11 citation statements)

References 22 publications

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“…The simplest candidate of the dark energy is a tiny positive time-independent cosmological constant Λ, for which w = −1. Another possibility is quintessence [5,6], a cosmic real scalar field that is displaced from the minimum of its potential. With the evolution of the universe, the scalar field slowly rolls down its potential.…”

Section: Introductionmentioning

confidence: 99%

Hessence: a new view of quintom dark energy

Hao

Cai

Zeng

2005

Class. Quantum Grav.

317

228

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Recently a lot of attention has been drawn to build dark energy model in which the equation-of-state parameter w can cross the phantom divide w = −1. One of models to realize crossing the phantom divide is called quintom model, in which two real scalar fields appears, one is a normal scalar field and the other is a phantom-type scalar field. In this paper we propose a non-canonical complex scalar field as the dark energy, which we dub "hessence", to implement crossing the phantom divide, in a similar sense as the quintom dark energy model. In the hessence model, the dark energy is described by a single field with an internal degree of freedom rather than two independent real scalar fields. However, the hessence is different from an ordinary complex scalar field, we show that the hessence can avoid the difficulty of the Q-ball formation which gives trouble to the spintessence model (An ordinary complex scalar field acts as the dark energy). Furthermore, we find that, by choosing a proper potential, the hessence could correspond to a Chaplygin gas at late times. *

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Section: Introductionmentioning

confidence: 99%

Hessence: a new view of quintom dark energy

Hao

Cai

Zeng

2005

Class. Quantum Grav.

317

228

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“…x ; x i ; (46) where is the noncommutative parameter. This type of noncommutative cosmology, which does not preserve the FRW symmetries, has been studied in [56 -58].…”

Section: Non-commutative Modelsmentioning

confidence: 99%

Noncommutative models in patch cosmology

Calcagni

2004

Phys. Rev. D

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We consider several classes of noncommutative inflationary models within an extended version of patch cosmological braneworlds, starting from a maximally invariant generalization of the action for scalar and tensor perturbations to a noncommutative brane embedded in a commutative bulk. Slow-roll expressions and consistency relations for the cosmological observables are provided, both in the UV and IR region of the spectrum; the inflaton field is assumed to be either an ordinary scalar field or a Born-Infeld tachyon. The effects of noncommutativity are then analyzed in a number of ways and energy regimes.Comment: 13 pages, 8 figures. Figures 1 and 2 are included in the text, Figs. 3-8 are in a low-resolution jpeg format. These and other high-resolution figures are available upon request to the author (calcagni@fis.unipr.it). v3: corrected misprint

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“…Also the tachyonic field has a potential which has an unstable maximum at the origin and decays to almost zero as the field goes to infinity. Depending on various forms of this potential following this asymptotic behaviour a lot of works have been carried out on tachyonic dark energy [16][17][18][19], tachyonic dark matter [20][21][22] and inflation models [23,24].…”

Section: Introductionmentioning

confidence: 99%

Dynamics of Logamediate and Intermediate Scenarios in the Dark Energy Filled Universe

Khatua

Debnath

2010

Int J Theor Phys

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We have considered a model of two component mixture i.e., mixture of Chaplygin gas and barotropic fluid with tachyonic field. In the case, when they have no interaction then both of them retain their own properties. Let us consider an energy flow between barotropic and tachyonic fluids. In both the cases we find the exact solutions for the tachyonic field and the tachyonic potential and show that the tachyonic potential follows the asymptotic behavior. We have considered an interaction between these two fluids by introducing a coupling term. Finally, we have considered a model of three component mixture i.e., mixture of tachyonic field, Chaplygin gas and barotropic fluid with or without interaction. The coupling functions decays with time indicating a strong energy flow at the initial period and weak stable interaction at later stage. To keep the observational support of recent acceleration we have considered two particular forms (i) Logamediate Scenario and (ii) Intermediate Scenario, of evolution of the Universe. We have examined the natures of the recent developed statefinder parameters and slow-roll parameters in both scenarios with and without interactions in whole evolution of the universe.

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The Gravitating Perfect Fluid-Scalar Field Equations: Quintessence and Tachyonic Matter

Cited by 20 publications

References 22 publications

Hessence: a new view of quintom dark energy

Hessence: a new view of quintom dark energy

Noncommutative models in patch cosmology

Dynamics of Logamediate and Intermediate Scenarios in the Dark Energy Filled Universe

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