Gamma-ray bursts and dark energy-dark matter interaction

Barreiro, Tiago; Bertolami, Orfeu; Torres, Paulo

doi:10.1111/j.1365-2966.2010.17344.x

Cited by 9 publications

(5 citation statements)

References 28 publications

(56 reference statements)

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“…Then, other classes of models are motivated from a field theory perspective and are well motivated. Numerous observations [26][27][28][29][30][31][32][33][34][35][36][37] are in support of the theory of dark sector interaction, constraining energy transfer from DM to DE or the opposite paved their way into existence. Cosmological observations indicate that the coupling impacts the universe's evolution [38,39].…”

Section: Jcap05(2024)033mentioning

confidence: 88%

Coupled quintessence scalar field model in light of observational datasets

Patil,

Ruchika,

Panda

2024

J. Cosmol. Astropart. Phys.

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We do a detailed analysis of a well-theoretically motivated interacting dark energy scalar field model with a time-varying interaction term. Using current cosmological datasets from CMB, BAO, Type Ia Supernova, H(z) measurements from cosmic chronometers, angular diameter measurements from Megamasers, growth measurements, and local SH0ES measurements, we found that dark energy component may act differently than a cosmological constant at early times. The observational data also does not disfavor a small interaction between dark energy and dark matter at late times. When using all these datasets in combination, our value of H 0 agrees well with SH0ES results but in 2.5σ tension with Planck results. We also did AIC and BIC analysis, and we found that the cosmological data prefer coupled quintessence model over ΛCDM, although the chi-square per number of degrees of freedom test prefers the latter.

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Section: Jcap05(2024)033mentioning

confidence: 88%

Coupled quintessence scalar field model in light of observational datasets

Patil,

Ruchika,

Panda

2024

J. Cosmol. Astropart. Phys.

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“…The latter value arises from the matching of the model with supernova, CMB data, and cosmic topology [45,47,52]. Notice that in what concerns α, the observational constraints are as follows: WMAP1 is compatible with α 0.6 [45]; WMAP3 admits values in the range α 0.2 [53]; and structure formation implies that α 0.2 [54].…”

Section: The Generalized Chaplygin Gas -An State Equation For the Dar...mentioning

confidence: 99%

Perturbative approach for mass varying neutrinos coupled to the dark sector in the generalized Chaplygin gas scenario

Bernardini

Bertolami

2008

Phys. Rev. D

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We suggest a perturbative approach for generic choices for the universe equation of state and introduce a novel framework for studying mass varying neutrinos (MaVaN's) coupled to the dark sector. For concreteness, we examine the coupling between neutrinos and the underlying scalar field associated with the generalized Chaplygin gas (GCG), a unification model for dark energy and dark matter. It is shown that the application of a perturbative approach to MaVaN mechanisms translates into a constraint on the coefficient of a linear perturbation, which depends on the ratio between a neutrino energy dependent term and scalar field potential terms. We quantify the effects on the MaVaN sector by considering neutrino masses generated by the seesaw mechanism. After setting the GCG parameters in agreement with general cosmological constraints, we find that the squared speed of sound in the neutrino-scalar GCG fluid is naturally positive. In this scenario, the model stability depends on previously set up parameters associated with the equation of state of the universe. Our results suggest that the GCG is a particularly suitable candidate for constructing a stable MaVaN scenario.

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“…[5] for general discussions), on another hand, interaction within the dark sector itself should not be excluded. Indeed, a recent study [6] suggests that a putative interaction might also be detectable using for instance gamma-ray bursts. The interaction between dark energy and dark matter can be introduced either by ad hoc arguments [7] or because dark energy and dark matter are unified in the context of some framework [8][9][10][11].…”

Section: Introductionmentioning

confidence: 97%