منابع مشابه
Signatures of Explosion Models for Sn Ia & Cosmology
Based on detailed models for the progenitors, explosions, light curves (LCs) and spectra, we discuss signatures of thermonuclear explosions, and the implications for cosmology. Consistency is needed to link observables and explosion physics. SNe Ia most probably result from the explosion of a degenerate CO-White Dwarf (WD) close to the Chandrasekhar mass. There is strong evidence that most of t...
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Aims. Power-law cosmologies, in which the cosmological scale factor evolves as a power law in the age, a ∝ t with α >∼ 1, regardless of the matter content or cosmological epoch, is comfortably concordant with a host of cosmological observations. Methods. In this article, we use recent measurements of the X-ray gas mass fractions in clusters of galaxies to constrain the α parameter with curvatur...
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We study spatially flat isotropic universes driven by k-essence. It is shown that Friedmann and k-field equations may be analytically integrated for arbitrary k-field potentials during evolution with a constant baryotropic index. It follows that there is an infinite number of dynamically different k-theories with equivalent kinematics of the gravitational field. We show that there is a large “w...
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HET Optical spectra covering the evolution from about 6 days before to about 5 weeks after maximum light and the ROTSE-IIIb unfiltered light curve of the “Branch-normal” Type Ia Supernova SN 2005hj are presented. The host galaxy shows H II region lines at redshift of z = 0.0574, which puts the peak unfiltered absolute magnitude at a somewhat over-luminous −19.6. The spectra show weak and narrow...
متن کاملType Ia Supernovae and Cosmology
I discuss the use of Type Ia supernovae (SNe Ia) for cosmological distance determinations. Low-redshift SNe Ia (z < ∼ 0.1) demonstrate that the Hubble expansion is linear with H0 = 72 ± 8 km s −1 Mpc, and that the properties of dust in other galaxies are generally similar to those of dust in the Milky Way. The light curves of high-redshift (z = 0.3– 1) SNe Ia are stretched in a manner consisten...
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ژورنال
عنوان ژورنال: Journal of Cosmology and Astroparticle Physics
سال: 2014
ISSN: 1475-7516
DOI: 10.1088/1475-7516/2014/10/047