On the Nature of the Compact Objects in the AGNs
  If the cores of Galaxies and AGNs comprise Supermassive Stars (SMSs) (Hoyle and Fowler 1963), nuclear energy generation may not be ignited for masses $M > 6\times 10^4 M_\odot$, and highly supermassive stars are likely to generate their luminosity, $L_{KH}$ slow gravitational contraction. We show that for such massive Newtonian SMSs, both the value of $L_{KH}$ and the the accretion luminosity, $L_{acc}$, could be much less than the appropriate Eddington value. Such highly SMSs will have a surface density as low as $10^{-14}$ g/cm$^3$ and they will not behave like a compact object with a ``hard surface'. For all such reasons, it is indeed possible to have $L_{SMS} \ll L_{ed}$. And this effect may be incorrectly interpreted as the evidence for the existence of central Super Massive Black Holes with Event Horizons.   In fact, in a very detailed work, and from various angles, we have recently shown that, the General Theory of Relativity does not permit the occurrenes of ``trapped surfaces'' and Black Holes (Mitra 1998a, gr-qc/9810038). 
Abhas Mitra