Halos of unified dark matter scalar field

Bertacca, Daniele; Bartolo, N.; Matarrese, S.

doi:10.1088/1475-7516/2008/05/005

Cited by 27 publications

(23 citation statements)

References 56 publications

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“…The importance of scalar fields in the dark sector has been increased; for instance, several authors have investigated the unification of dark matter and dark energy in a single scalar field (Padmanabhan & Choudhury 2002; Arbey, Lesgourgues & Salati 2003; Bertacca, Bartolo & Matarrese 2008). Recently Liddle & Ureña‐López (2006) and Liddle, Cédric & Ureña‐López (2008) proposed that the landscape of superstring theory can provide the Universe with a φ 2 +Λ scalar field potential.…”

Section: Introductionmentioning

confidence: 99%

φ²as dark matter

Matos

Vázquez-González

Magaña

2009

Monthly Notices of the Royal Astronomical Society

104

114

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In this paper, we consider φ2 scalar field potential as a candidate to dark matter. If it is an ultralight boson particle, it condensates like a Bose–Einstein system at very early times and forms the basic structure of the Universe. Real scalar fields collapse in equilibrium configurations which oscillate in space–time (oscillatons).The cosmological behaviour of the field equations are solved using the dynamical system formalism. We use the current cosmological parameters as constraints for the present value of the scalar field and reproduce the cosmological predictions of the standard Λ cold dark matter model with this model. Therefore, scalar field dark matter seems to be a good alternative to cold dark matter nature.

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Section: Introductionmentioning

confidence: 99%

φ²as dark matter

Matos

Vázquez-González

Magaña

2009

Monthly Notices of the Royal Astronomical Society

104

114

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“…[29,30,31,32,33,34]), the Modified Chaplygin gas [35], the Scherrer [36] and generalized Scherrer solutions [22], the single dark perfect fluid with a simple 2-parameter barotropic equation of state [37], or the homogeneous scalar field deduced from the galactic halo space-time [38] (see also Ref. [39]). …”

Section: Introductionmentioning

confidence: 99%

How the scalar field of unified dark matter models can cluster

Bertacca

Bartolo

Diaferio

et al. 2008

J. Cosmol. Astropart. Phys.

Self Cite

104

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Abstract. We use scalar-field Lagrangians with a non-canonical kinetic term to obtain unified dark matter models where both the dark matter and the dark energy, the latter mimicking a cosmological constant, are described by the scalar field itself. In this framework, we propose a technique to reconstruct models where the effective speed of sound is small enough that the scalar field can cluster. These models avoid the strong time evolution of the gravitational potential and the large Integrated Sachs-Wolfe effect which have been a serious drawback of previously considered models. Moreover, these unified dark matter scalar field models can be easily generalized to behave as dark matter plus a dark energy component behaving like any type of quintessence fluid.

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“…Besides a mechanism of inflation, the K-fields also can be a dynamical dark energy model [70][71][72]. As a scalar field pervading the universe, from the effective field theory view point, the K-fields must interact with the matter that is present [73].…”

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confidence: 99%

Braneworld in f(T) gravity theory with noncanonical scalar matter field

et al. 2018

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In this paper, we investigate the braneworld scenario in f (T ) gravity with a K-field as the background field. We consider various different specific forms of f (T ) gravity and K-field, and find a general way to construct the braneworld model. Based on our solutions, the split of branes is investigated. Besides, the stability of the braneworld is studied by investigating the tensor perturbation of the vielbein. I. INTRODUCTIONOne of the most well-known and earliest extra dimension theories was first proposed by T. Kaluza [1] and O. Klein [2] to unify Einstein's general relativity and Maxwell's electromagnetism in the 1920s. The extra dimension theories drew wide attention with the work of N. Arkani-Hamed, S. Dimopoulos, and G. R. Dvali [3] and the works of L. Randall and R. Sundrum [4, 5] in the end of the 20th century. Later, various braneworld scenarios were developed such as the Gregory-Rubakov-Sibiryakov (GRS) model [6], the Dvali-Gabadadze-Porrati (DGP) model [7], the thick brane model [8-17], the universal extra dimension model[18], etc. Among these theories, one important model is the thick brane theory originated from the domain wall model proposed by V. A. Rubakov and M. E. Shaposhnikov [19] in 1983.In the thick brane model, the brane could be generated by scalar fields [11,[20][21][22][23][24][25][26], as well as vector fields and spinor fields [12,27,28]. In addition, there are also braneworld models without matter fields [14,29,30]. The standard model fields in the bulk can be localized near the brane [6, 11,[31][32][33][34].The braneworld was also studied in different modified gravity theories, for example, the scalar-tensor gravity theory [35][36][37][38][39][40][41][42][43][44], the metric f (R) gravity theory [45][46][47] and the Palatini f (R) theory [48,49]. As f (T ) gravity theory came up as an alternative to dark energy for the explanation of the acceleration of the universe [50], it was then widely investigated [51][52][53][54][55]. Braneworld models in f (T ) theories were studied in Refs. [56][57][58]. In the previous works [56,57], the solutions of braneworld scenarios in f (T ) gravity with the form of f (T ) = T + αT n were investigated by the first-order formalism, i.e., the superpotential way. Besides, the split of the brane in f (T ) gravity was given in Ref. [56]. Furthermore, the tensor perturbation of the braneworld was also studied in Ref. [58] and it was shown that the solutions to the f (T ) braneworld were stable. The localization of matter fields was also investigated in Ref. [56]. *

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Halos of unified dark matter scalar field

Cited by 27 publications

References 56 publications

φ²as dark matter

φ²as dark matter

How the scalar field of unified dark matter models can cluster

Braneworld in f(T) gravity theory with noncanonical scalar matter field

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Halos of unified dark matter scalar field

Cited by 27 publications

References 56 publications

φ2as dark matter

φ2as dark matter

How the scalar field of unified dark matter models can cluster

Braneworld in f(T) gravity theory with noncanonical scalar matter field

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φ²as dark matter

φ²as dark matter