7,582 research outputs found
Study of Inflationary Generalized Cosmic Chaplygin Gas for Standard and Tachyon Scalar Fields
We consider an inflationary universe model in the context of generalized
cosmic Chaplygin gas by taking matter field as standard and tachyon scalar
fields. We evaluate the corresponding scalar fields and scalar potentials
during intermediate and logamediate inflationary regimes by modifying the first
Friedmann equation. In each case, we evaluate the number of e-folds, scalar as
well as tensor power spectra, scalar spectral index and important observational
parameter, i.e., tensor-scalar ratio in terms of inflatons. The graphical
behavior of this parameter shows that the model remains incompatible with WMAP7
and Planck observational data in each case.Comment: 20 pages, 8 figures, Accepted for publication in EPJ
QCD analysis of neutrino charged current structure function F2 in deep inelastic scattering
An analytic expression for the neutrino charged current structure function F sub 2 (x, Q sup 2) in deep inelastic scattering, consistent with quantum chromodynamics, is proposed. The calculated results are in good agreement with experiment
P(P bar)P elastic scattering and cosmic ray data
It is shown that the total cross section for pp elastic scattering at cosmic ray energies, as well as the total cross section, the slope parameter b(s,t) and the differential cross section for small momentum transfer at ISR and collider energies for p(p)p elastic scattering can be simultaneously fitted by using a simple Regge pole model. The results of this theory is discussed in detail
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