5 citations · 9 across the 4 of their papers we have counts for
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Relations between the modified Chaplygin gas and a scalar field
Sandro Silva e Costa
In this work the modified Chaplygin gas is related to a cosmological scalar field. Analytical results, more general than the solutions previously shown in the literature, are prese…
The harmonic oscillator, dimensional analysis and inflationary solutions
Sandro Silva e Costa
In this work, focused on the production of exact inflationary solutions using dimensional analysis, it is shown how to explain inflation from a pragmatic and basic point of view, i…
Birth of a Closed Universe of Negative Spatial Curvature
S. S. e Costa, H. V. Fagundes
We propose a modified form of the spontaneous birth of the universe by quantum tunneling. It proceeds through topology change and inflation, to eventually become a universe with cl…
Schwarzschild solution and Mach's principle
Sandro S. Costa
The purpose of this work is to show a possible reconciliation between Mach's principle and the Schwarzschild solution, using a description of this solution in terms of a new radial…