15 citations · 18 across the 4 of their papers we have counts for
4 papers
Average luminosity distance in inhomogeneous universes
Valentin Kostov
Using numerical ray tracing, the paper studies how the average distance modulus in an inhomogeneous universe differs from its homogeneous counterpart. The averaging is over all dir…
Average luminosity distance in inhomogeneous universes
Valentin Kostov
The paper studies the correction to the distance modulus induced by inhomogeneities and averaged over all directions from a given observer. The inhomogeneities are modeled as mass-…
Two non-comoving stiff fluids in radial motion and spherical symmetry
Valentin Kostov
The problem of two stiff fluids (energy density = pressure) moving radially in spherical symmetry is treated. The metric ansatz is chosen spherically symmetric, conformally static…
Mass Distribution of Spiral Galaxies in a Thin Disk Model with Velocity Curve Extrapolation
Valentin Kostov
We model a spiral galaxy by a thin axially symmetric disk that includes both visible and dark matter. The surface mass density of the disk is calculated directly from the rotationa…