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  1. 2 Open Physics

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  1. 1 2006

  2. 1 2004

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  1. 1 Baleanu D.

  2. 1 Kirilova D.

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Cosmological perturbations in FRW model with scalar field within Hamilton-Jacobi formalism and symplectic projector method

100%
Baleanu D.
Open Physics
|
2006
|
vol. 4
|
issue 4
503-510
EN
The Hamilton-Jacobi analysis is applied to the dynamics of the scalar fluctuations about the Friedmann-Robertson-Walker (FRW) metric. The gauge conditions are determined from the consistency conditions. The physical degrees of freedom of the model are obtained by the symplectic projector method. The role of the linearly dependent Hamiltonians and the gauge variables in the Hamilton-Jacobi formalism is discussed.
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Neutrino oscillations and the early universe

72%
Kirilova D.
Open Physics
|
2004
|
vol. 2
|
issue 3
467-491
EN
The observational and theoretical status of neutrino oscillations in connection with solar and atmospheric neutrino anomalies is presented briefly. The effect of neutrino oscillations on the evolution of the early Universe is discussed in detail. A short review is given of the standard Big Bang Nucleosynthesis (BBN) and the influence of resonant and non-resonant neutrino oscillations on active neutrinos and on primordial synthesis of He-4. BBN cosmological constraints on neutrino oscillation parameters are discussed.
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