7 citations · 25 across the 12 of their papers we have counts for
13 papers
Nakedly singular counterpart of Schwarzschild's incompressible star. A barotropic continuity condition in the center
Łukasz Bratek, Joanna Jałocha, Andrzej Woszczyna
A static sphere of incompressible fluid with uniform proper energy density is considered as an example of exact star-like solution with weakened central regularity conditions chara…
First integrals in the Brans-Dicke cosmology
Zdzislaw A. Golda, Andrzej Woszczyna, Lukasz Bratek
The work presents the frst and the second degree Darboux polynomials, Jacobi's last multipliers as well as the set of frst integrals for Brans-Dicke cosmology. Algebraic invariant…
Symbolic Tensor Calculus -- Functional and Dynamic Approach
A. Woszczyna, P. Plaszczyk, W. Czaja +1
In this paper, we briefly discuss the dynamic and functional approach to computer symbolic tensor analysis. The ccgrg package for Wolfram Language/Mathematica is used to illustrate…
Consistent initial data for CMD perturbations
Wojciech Czaja, Zdzislaw A. Golda, Andrzej Woszczyna
We investigate the initial condition which are simultaneously consistent with perturbation equations in both the radiation-dominated and the mater-dominated epochs. The exact formu…
Momentum of cosmological acoustic field
Wojciech Czaja, Zdzislaw A. Golda, Andrzej Woszczyna
The acoustic spacetime corresponding to perturbed Friedman-Lemaitre-Robertson-Walker universe inherit the space isometries from the original FLRW model, but essentially differs in…
The acoustic wave equation in the expanding universe. Sachs-Wolfe theorem
Wojciech Czaja, Zdzislaw A. Golda, Andrzej Woszczyna
In this paper the acoustic field propagating in the early hot () universe of arbitrary space curvature () is considered. The field equations are reduced to the d'…