Cosmic microwave background anisotropy with cosine-type quintessence

Kawasaki, Masahiro; Moroi, Takeo; Takahashi, Tomo

doi:10.1103/physrevd.64.083009

Cited by 25 publications

(36 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In figure 2 we show the 1, 2, and 3 σ constraints in the (f, µ) plane obtained by our analysis. Comparison with figure 5 of [12], shows that the more recent data improve by a factor of three or so the constraints on µ.…”

Section: Discussionmentioning

confidence: 87%

“…In [12], a detailed study of the parameter space of the model has been performed by taking into account the constraints from CMB observations of BOOMERanG [22] and MAXIMA [23]. Constraints on this quintessence model were derived from its effects on integrated Sachs-Wolfe effect as well as from its effects on the location of the first peak.…”

Section: Discussionmentioning

confidence: 99%

“…Our approach is orthogonal to the "model independent" approach recently taken on the subject by many investigators (see for instance [9]), and is admittedly based on a theoretical prejudice in favor of radiatively stable potentials. To our knowledge, the most recent complete analyses of this model date back to about five years ago [10,11,12]. Given the recent developments of the observational situation, we believe that it is important to perform an analysis of the model in which the latest data are taken into account.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Confronting pseudo-Nambu-Goldstone-boson quintessence with data

Dutta

Sorbo

2007

Phys. Rev. D

View full text Add to dashboard Cite

We analyze the observational constraints on the model where a pseudo-Nambu-Goldstone boson (pNGB) plays the role of dark energy. The constraints are derived by using the latest Gold set of 182 type Ia supernovae and the CMB shift parameter. We allow for both the initial value of the scalar field and the present value of the energy density in the pNGB to vary. We find that -compared to previous analyses -the allowed portion of parameter space has shrunk around the region where the pNGB does not evolve significantly.

show abstract

Section: Discussionmentioning

confidence: 87%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Confronting pseudo-Nambu-Goldstone-boson quintessence with data

Dutta

Sorbo

2007

Phys. Rev. D

View full text Add to dashboard Cite

show abstract

“…The amplitude of these perturbations will be proportional to the value of Hubble rate evaluated during the period of inflation H inf , if their quantum origins are from inflation. For a large H inf the isocurvature DE perturbations may be non-negligible and will contribute to the observed CMB anisotropy [178,179]. In the cases discussed here, however, these isocurvature perturbations are negligible.…”

Section: Analysis Of Perturbations In Quintom Cosmologymentioning

confidence: 82%

Quintom cosmology: Theoretical implications and observations

et al. 2010

View full text Add to dashboard Cite

We review the paradigm of quintom cosmology. This scenario is motivated by the observational indications that the equation of state of dark energy across the cosmological constant boundary is mildly favored, although the data are still far from being conclusive. As a theoretical setup we introduce a no-go theorem existing in quintom cosmology, and based on it we discuss the conditions for the equation of state of dark energy realizing the quintom scenario. The simplest quintom model can be achieved by introducing two scalar fields with one being quintessence and the other phantom. Based on the double-field quintom model we perform a detailed analysis of dark energy perturbations and we discuss their effects on current observations. This type of scenarios usually suffer from a manifest problem due to the existence of a ghost degree of freedom, and thus we review various alternative realizations of the quintom paradigm. The developments in particle physics and string theory provide potential clues indicating that a quintom scenario may be obtained from scalar systems with higher derivative terms, as well as from nonscalar systems. Additionally, we construct a quintom realization in the framework of braneworld cosmology, where the cosmic acceleration and the phantom divide crossing result from the combined effects of the field evolution on the brane and the competition between four and five dimensional gravity. Finally, we study the outsets and fates of a universe in quintom cosmology. In a scenario with null energy condition violation one may obtain a bouncing solution at early times and therefore avoid the Big Bang singularity. Furthermore, if this occurs periodically, we obtain a realization of an oscillating universe. Lastly, we comment on several open issues in quintom cosmology and their connection to future investigations.

show abstract

“…Cosine type potentials resulting from a quintessence axion were introduced in [22,23] and their implications for the CMB have been studied in [24]. They take on the classical potential…”

Section: B Nambu-goldstone Cosine Potentialsmentioning

confidence: 99%

Loop corrections to scalar quintessence potentials

2002

View full text Add to dashboard Cite

The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. The stability of scalar quintessence potentials under quantum fluctuations is investigated for both uncoupled models and models with a coupling to fermions. We find that uncoupled models are usually stable in the late universe. However, a coupling to fermions is severely restricted. We check whether a graviton induced fermion-quintessence coupling is compatible with this restriction.

show abstract

Cosmic microwave background anisotropy with cosine-type quintessence

Cited by 25 publications

References 36 publications

Confronting pseudo-Nambu-Goldstone-boson quintessence with data

Confronting pseudo-Nambu-Goldstone-boson quintessence with data

Quintom cosmology: Theoretical implications and observations

Loop corrections to scalar quintessence potentials

Contact Info

Product

Resources

About