Abstract

In the Scale Expanding Cosmos (SEC) the gravitational potential is modified by the cosmological scale expansion. The range of the gravitational field rolls off close to the Hubble distance and the presence of matter modifies the gravitational vacuum field, which evaluated in the cosmological reference frame contains negative energy that should equal the gravitating mass energy mc². A freely falling particle never reaches the event-horizon, which could prevent the formation of black holes. Although the results presented in this paper are tentative, two definite conclusions may be made in the SEC model:

1. The event-horizon is a true singularity.
2. Any spherically symmetric solution (other than the cosmological line element) of the Einstein's equations necessarily must modify the vacuum energy-momentum tensor generating negative field energy.