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***NSBL-RC-012 Realistic Non-Singular Cosmology with Negative Vacuum Density**

**Abstract**

We present a version of ``realistic non-singular cosmology'' in which the upper turning point of expansion is provided by negative mass density of vacuum rather than by gravitational radiation. The lower turning point is still provided by the negative pressure of electromagnetic energy. Again, assuming that the temperature of microwave radiation is a true measure of the electromagnetic energy density of the universe, and that the supernovae data of magnitudes and redshifts are reliable, we can determine (tentatively) the parameters of this version of our model, with an appropriate Hubble fraction of 0.475, and a deceleration parameter of 0.65, and estimate the time that passed, about 13.3 Gyr, since the initiation of the expansion phase, and the time that remains, about 55 Gyr, before the return to contraction. The maximum radiational temperature was only about 27,344 K, and the maximum mass density was low enough to give each typical star an ample space of about 5% of a lightyear to proceed with its own activity without disruption.

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nazirbaaklini@yahoo.com **