by Paul Ratner
have branched off
main universe after the Big Bang
appear to us
Credit: Kavli IPMU
led to black
holes and dark matter,
proposes a new
There may be baby universes
Researchers recently used a huge telescope in Hawaii
to study primordial black holes.
These black holes might have formed in the early
days from baby universes and may be responsible for
The study also raises the possibility that our own
universe may look like a black hole to outside
A new paper (Exploring
Primordial Black Holes from the Multiverse with Optical Telescopes)
takes a deep dive into primordial black holes that were formed as a
part of the early universe when there were still no stars or
black holes could
account for strange cosmic possibilities, including baby universes
and major features of the current state of the cosmos like
To study the exotic primordial black holes (PBHs), physicists
employed the Hyper Suprime-Cam (HSC)
of the huge 8.2m
Subaru Telescope operating near the 4,200 meter
summit of Mt. Mauna Kea in Hawaii.
This enormous digital
camera can produce images of the entire Andromeda galaxy every few
minutes, helping scientists observe one hundred million stars in one
In their study, the scientists considered a number of scenarios,
especially linked to the period of inflation. That is the time of
quick expansion following
the Big Bang, when the universe we know
today came into existence with all its structures.
The researchers calculated that in the process of inflation, the
climate was ripe for creating primordial black holes of various
masses. And some of them reflect the characteristics predicted for
Another way PBHs could have been created during inflation is from
"baby universes" - small universes that branched off from the main
Hyper Suprime-Cam (HSC)
gigantic digital camera
Credit: HSC project / NAOJ
A baby or "daughter" universe would ultimately collapse but the
tremendous release of energy would lead to the formation of a black
the press release from the Kavli
Institute for the Physics and Mathematics of the Universe (Kavli
IPMU) in Japan, one of the institutions participating in this study.
What's also fascinating, some of the bigger baby universes might not
have gone so quietly.
Above a certain critical
size, the theory of gravity developed by Albert Einstein permits
that such a universe may be perceived differently by observers.
you were inside it, you'd see an expanding universe, while if you
were outside, this baby universe would look like a black hole...
A conjecture that leads
to wondering - are we potentially on the inside or outside of such a
If you follow this
multiverse logic, it also may be
possible that while primordial black holes would appear to us as
black holes, their true structural natures could be concealed by
their "event horizons" - the boundaries surrounding black holes from
which not even light can escape.
It should be noted, while strange or counter-intuitive, this is not
the first go-around for these types of ideas.
A study earlier in 2020 (A
Mini Fractal Universe may lie Inside charged Black Holes - if they
exist) found that so-called "charged" black holes may
include within them endlessly-repeating fractal universes of various
sizes, including miniature, that can be stretched and deformed in
To solidify their theories and to find a primordial black hole, the
researchers will continue using the Subaru Telescope, with some
promising PBH candidates already emerging.
The international team of particle physicists working on the
research came from the University of California, Los Angeles and the
The group included
cosmologists and astronomers,
Check out their new paper
Primordial Black Holes from the Multiverse with Optical Telescopes"
in Physical Review Letters.