Tracker phantom field and a cosmological constant: Dynamics of a composite dark energy model

Cedeño, Francisco X. Linares; Roy, Nandan; Ureña–López, L. Arturo

doi:10.1103/physrevd.104.123502

Cited by 18 publications

(24 citation statements)

References 59 publications

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“…However, even with this proposal, it was found that this kind of phantom model does not address the Hubble constant problem when considering a compressed Planck likelihood. This analysis gave a Hubble value of H 0 = 69.1 +0.5 −0.6 km/s/Mpc [51], which is in a 3σ C.L. tension with the latest result from the SH0ES collaboration [52].…”

Section: Phantom Scalar Field Cosmology Backgroundsupporting

confidence: 64%

“…Within this scheme, tracker scenarios have been considered [48,49] where the scalar field controls the energy density and reproduces attractor background solutions, which can be constrained with local observations. In this work, we will study the parametrizations proposed in [50] and, in particular, the phantom scalar field dark energy model proposed in [51]. Considering several CMB baselines, we will verify if this model can solve (or relax) the H 0 tension.…”

Section: Phantom Scalar Field Cosmology Backgroundmentioning

confidence: 99%

“…and, as we can see, these fields give rise to an equation of state w < −1. In this framework, it is customary to consider a new set of hyperbolic polar coordinates which ease the numerical computations [51]: 7)…”

Section: Phantom Scalar Field Cosmology Backgroundmentioning

confidence: 99%

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Phantom Scalar Field Cosmologies Constrained by Early Cosmic Measurements

Nájera,

Escamilla-Rivera

2024

Universe

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In this work, we explore new constraints on phantom scalar field cosmologies with a scalar field employing early-time catalogs related to CMB measurements, along with the local standard observables, like Supernovae Type Ia (SNIa), H(z) measurements (Cosmick clocks), and Baryon Acoustic Oscillation (BAO) baselines. In particular, we studied a tracker phantom field with hyperbolic polar coordinates that have been proposed in the literature. The main goal is to obtain precise cosmological constraints for H0 and σ8, in comparison to other constructions that present tension in early cosmological parameters. Our results show that phantom scalar field cosmologies have a reduced statistical tension on H0 that it is less than 3σ using model-independent CMB catalogs as SPT-3G+WMAP9 and ACTPol DR-4+WMAP9 baselines. This suggests that these models, using a different phantom potential, might address the Hubble constant problem and reduce the systematics involved.

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Section: Phantom Scalar Field Cosmology Backgroundsupporting

confidence: 64%

Section: Phantom Scalar Field Cosmology Backgroundmentioning

confidence: 99%

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Phantom Scalar Field Cosmologies Constrained by Early Cosmic Measurements

Nájera,

Escamilla-Rivera

2024

Universe

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“…The current accelerated expansion of the universe is one of the riddles that cosmologist are trying to solve, and within the framework of GR it is the Cosmological Constant Λ who plays the role of the main component responsible of such accelerated expansion, the so-called Dark Energy. The origin of this dark component is still unknown, and there are many models in the literature based on different physics: some examples are dark energy fluids [14][15][16][17][18][19], quintessence/phantom scalar fields [20][21][22][23][24][25][26][27][28][29][30][31], modified gravity [32][33][34][35][36][37][38][39][40][41], between others.…”

Section: Introductionmentioning

confidence: 99%

Gauge fixing in cosmological perturbations of Unimodular Gravity

Linares Cedeño,

Nucamendi

2023

J. Cosmol. Astropart. Phys.

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With focus on the cosmological evolution of linear perturbations of matter and geometry, we calculate the equivalent expressions to that of the Newtonian and Synchronous gauges within the framework of Unimodular Gravity, being these two gauges commonly used and implemented in Boltzmann codes. An important aspect of our analysis is the inclusion of the energy-momentum current violation, as well as its perturbations. Moreover, for the first time we demonstrate that it is possible to fix both gauges consistently, although as it has been already noticed in previous literature, neither of them is recovered in the sense of the dynamics given in General Relativity for matter and metric fluctuations. Specifically, we show that since the unimodular constraint at the level of linear perturbations lead to only one degree of freedom of scalar modes of metric fluctuations, the dynamics in Unimodular Gravity forces to keep the anisotropic stress in the Newtonian gauge, whereas the cold dark matter comoving frame can not be set in the Synchronous gauge. The physical implications on the density contrast of cold dark matter is reviewed, and the Sachs-Wolfe effect is obtained and compared with previous results in the literature of cosmological perturbations in Unimodular Gravity.

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“…There have been a number of attempts to address these problems (See [28][29][30] and the references therein), which includes different dynamical dark energy models with a dynamical equation of state (w DE = −1) for the dark energy (DE) component [31][32][33]. It has already been shown by a number of authors that a phantom-like equation of state (EoS) of the dark energy sector can effectively speed up the acceleration of the universe which results in a higher value of the Hubble parameter H 0 [34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Quintessence or Phantom: Study of scalar field dark energy models through a general parametrization of the Hubble parameter

Roy¹,

Goswami²,

Das³

2022

Preprint

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In this work we propose a simple general parametrization scheme of the Hubble parameter for the scalar field dark energy models. In our approach it is possible to incorporate both the quintessence and phantom scalar field in a single analytical scheme and write down relevant cosmological parameters which are independent of the nature of the scalar field. A general condition for the phantom barrier crossing has also been obtained. To test this approach, a well behaved parametrization of the normalized Hubble parameter has been considered and a wide variety of observational data like CMB data, Supernovae data, BAO data etc. has been used to constraint the various cosmological parameters. It has been found that data prefer the present value of the equation of state of the dark energy to be in the phantom domain. One interesting outcome of this analysis is that although the current value of the dark energy equation of state is phantom in nature, a phantom crossing of the EOS has taken place in the recent past. We have also carried out the Bayesian model comparison between ΛCDM model and the proposed model which indicates that this model is favored by data as compared to ΛCDM model.

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Tracker phantom field and a cosmological constant: Dynamics of a composite dark energy model

Cited by 18 publications

References 59 publications

Phantom Scalar Field Cosmologies Constrained by Early Cosmic Measurements

Phantom Scalar Field Cosmologies Constrained by Early Cosmic Measurements

Gauge fixing in cosmological perturbations of Unimodular Gravity

Quintessence or Phantom: Study of scalar field dark energy models through a general parametrization of the Hubble parameter

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