Constraints on dark energy models including gamma ray bursts
نویسندگان
چکیده
منابع مشابه
Constraining dark energy with gamma - ray bursts
We use the cosmology-independent gamma-ray burst (GRB) distances of Wang (2008) to constrain dark energy cosmological model parameters. Current GRB data alone can not tightly constrain cosmological parameters and allow for a wide range of dark energy models. When used jointly with current Type Ia supernovae data and baryon acoustic peak measurements, the GRB data favor slightly lower values of ...
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After presenting a short history of gamma-ray burst (GRB) studies, we discuss the current constraints on GRB models which follows from astronomical observations. We concentrate on the energetics of the GRBs with known redshifts and the association of the well-localized GRBs with star forming regions in remote galaxies. We also discuss implications of the observed GRB rate. Arguments are given f...
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An Eγ,jet ∝ E ′ p 1.5 relationship with a small scatter for current γ-ray burst (GRB) data was recently reported, where Eγ,jet is the beaming-corrected γ-ray energy and E ′ p is the νFν peak energy in the local observer frame. By considering this relationship for a sample of 12 GRBs with known redshift, peak energy, and break time of afterglow light curves, we constrain the mass density of the ...
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The Milagro Gamma-Ray Observatory employs a water Cerenkov detector to observe extensive air showers produced by high-energy particles interacting in the Earth’s atmosphere. Milagro has a wide field of view and high duty cycle, monitoring the northern sky almost continuously in the 100 GeV to 100 TeVenergy range. Milagro is thus uniquely capable of searching for very high energy emission from g...
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We show that γ-ray burst (GRB) afterglow observations strongly suggest, within the fireball model framework, that radiating electrons are shock accelerated to a power-law energy distribution, dne/dγe ∝ γ −p e , with universal index p ≈ 2.2, and that the fraction of shock energy carried by electrons, ξe, is universal and close to equipartition, ξe ∼ 1/3. For universal p and ξe, a single measurem...
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 2008
ISSN: 0370-2693
DOI: 10.1016/j.physletb.2007.10.053