  The origin and evolution of supermassive black holes (SMBHs) in our universe
have sparked controversy. In this study, we explore the hypothesis that some of
these black holes may have seeded from the direct collapse of dark energy
domains with density significantly higher than the surrounding regions. The
mechanism of the origin of such domains relies on the inflationary evolution of
a scalar field acting in D dimensions, which is associated with the
cosmological constant in our four-dimensional spacetime manifold. Inner space
quantum fluctuations of the field during inflation are responsible for the
spatial variations of the dark energy density in our space. This finding holds
particular significance, especially considering recent evidence from pulsar
timing array observations, which supports the existence of a stochastic
gravitational wave background consisting of SMBH mergers.
