# Is a non-vanishing cosmological constant really needed - Physics > General Physics

Is a non-vanishing cosmological constant really needed - Physics > General Physics - Download this document for free, or read online. Document in PDF available to download.

Abstract: Using consistenly the compact Friedmann-Lemaitre solutions for an open$k=-0.580$ universe with zero cosmological constant $\Lambda = 0$ we showthat the oberved apparent accelerated expansion is compatible with a timedependent Hubble parameter $H=\dot{R}-R$ equal to $H=87.95$ km-s-Mpc at$t=10.39$ Gys, $H {0}=67.9 \pm 4 $ km-s-Mpc at $t {o}=13.7 \pm 0.2$ Gyrspresent, $H=61.4$ km-s-Mpc at $t=15$ Gyrs and with an apparent globalflatness given by $1=\Omega {m}+\Omega {r}+\Omega {k}$ at all times which,properly averaged from galaxy formation times to present, gives$<\Omega {m}>=0.272$, $<\Omega {r}>=0.005$, $<\Omega {k}>=0.728$. Therefore, nocosmological constant is needed.

Author: ** Julio A. Gonzalo**

Source: https://arxiv.org/