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magnetospheric eternally collapsing object
Magnetospheric eternally collapsing objects or MECOs were proposed in 2003 as alternative models for black holes by Darryl Leiter and Stanley Robertson. They are a variant of the ''eternally collapsing objects'' or ECOs proposed by Abhas Mitra first in 1998.〔A. Mitra,Foundations of Physics Letters,
Volume 15, pp 439–471 (2002) (Springer, Germany)〕 His peer reviewed paper published in Journal of Mathematical Physics of the American Institute of Physics supports this contention that the so-called black holes should be ECOs by showing that true Schwarzschild black holes have gravitational mass M = 0.〔A. Mitra, J. Math. Phys. 50, 042502 (2009) (American Institute of Physics)〕 He argues that (i) The so-called massive Black Hole Candidates (BHCs) must be quasi-black holes rather than exact black holes and (ii) During preceding gravitational collapse, entire mass energy and angular momentum of the collapsing objects must be radiated away before formation of exact mathematical black holes. And since the formation of a mathematical zero-mass black hole requires infinite proper time, continued gravitational collapse becomes eternal, and the so-called black hole candidates must be Eternally Collapsing Objects (ECO). For physical realization of this, he argued that in an extremely relativistic regime, continued collapse must be slowed to a near halt by radiation pressure at the Eddington limit.〔A. Mitra, Phys. Rev. D 74, 024010 (2006) (American Physical Soc., USA) 〕〔A. Mitra, MNRAS, 367, L66-L68 (2006) (Royal Astronomical Soc., London) 〕〔A. Mitra, MNRAS, 369, 492–496 (2006) (Royal Astronomical Soc. London)〕〔A. Mitra, New Astronomy, Volume 12, 146–160 (2006) (Elsevier, Netherlands) 〕〔A. Mitra & N.K. Glendenning, MNRAS 404, L50-L54 (2010) (Royal Astronomical Soc., London)〕
A proposed observable difference between MECOs and black holes is that the MECO can produce its own intrinsic magnetic field. An uncharged black hole cannot produce its own magnetic field, though its accretion disc can.〔
==Theoretical model==
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