Astronomical observations reveal a gap in the mass distribution of relativistic objects:
neither black holes nor neutron stars with masses between two and five solar masses have
ever been observed. Based on the solution of the TOV equation, modified to include scalar
fields and in combination with Quantum Chromodynamics (QCD), we propose a new class of
invisible dark energy objects (DEOs), whose mass-range covers this gap properly. It turns
out that the eternal state of nuclear matter inside massive NSs is incompressible
quark-superfluids, where the particles moves almost freely in line with the asymptotic
freedom of QCD. Unlike normal astronomical objects, the environs inside DEOs are fairly
flat, but surrounded by strongly curved spacetime. The consequence is that DEOs are
practically invisible and therefore observationally indistinguishable from isolated and
inactive stellar black holes.
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