{"id":169873,"date":"2025-09-26T04:50:09","date_gmt":"2025-09-26T04:50:09","guid":{"rendered":"https:\/\/www.newsbeep.com\/ca\/169873\/"},"modified":"2025-09-26T04:50:09","modified_gmt":"2025-09-26T04:50:09","slug":"our-universe-could-be-trapped-inside-a-black-hole-with-no-way-out","status":"publish","type":"post","link":"https:\/\/www.newsbeep.com\/ca\/169873\/","title":{"rendered":"Our Universe could be trapped inside a black hole with no way out"},"content":{"rendered":"

The Big Bang may have actually been the explosive rebound of a collapsing black hole \u2013 one which our entire Universe could still be inside of.<\/p>\n

That\u2019s the claim of a new study led by Enrique Gazta\u00f1aga at the University of Portsmouth. The paper suggests the Big Bang was actually a \u2018Big Bounce\u2019, when matter falling into a giant black hole compressed, then rebounded and expanded outwards to create the Universe.<\/p>\n

\u201cIn other words, our entire observable Universe could be the inside of a black hole formed in a larger Universe,\u201d Gazta\u00f1aga told BBC Science Focus.<\/p>\n

Trapped in the event horizon<\/p>\n

The research, recently published in Physical Review D<\/a>, re-examined what happens when a dense, extremely large cloud of gas collapses under its own gravity.<\/p>\n

Rather than the traditional view that it will form an infinitely dense point (known as a singularity), the study proposes that the in-rushing matter instead reaches a certain point before bouncing off itself.<\/p>\n

This rebound results in a rapid expansion that closely resembles what cosmologists believe happened after the Big Bang, meaning our reality could be trapped within the event horizon of a black hole.<\/p>\n

This \u2018Black Hole Universe model\u2019 would help explain several key problems with the current, mainstream understanding of cosmology, known as the standard model.<\/p>\n

The standard model only works if there was a period of inflation, where the entire cosmos rapidly expanded a fraction of a second after the Big Bang. It also requires \u2018dark energy<\/a>\u2019, a mysterious substance that\u2019s pushing the cosmos apart, to explain why the Universe\u2019s more recent expansion appears to be accelerating.<\/p>\n

\u201cBut we don\u2019t know what either of these components actually are,\u201d said Gazta\u00f1aga. \u201cIn contrast, both periods of rapid expansion emerge naturally in the Black Hole Universe model as consequences of the geometry and dynamics of the bounce.<\/p>\n

\u201cOne reason this model is compelling is its simplicity: it explains cosmic expansion, inflation, and dark energy using only gravity and quantum mechanics \u2013 no extra assumptions or unknown ingredients.\u201d<\/p>\n

The Black Hole Universe model is not without its own problems. For instance, it still gives no insight into what dark matter<\/a> is. We know the invisible substance is spread throughout the Universe, as we can see it holding galaxies together, but astronomers have struggled to find what it\u2019s made of.<\/p>\n

\u201cIt\u2019s possible that some forms of dark matter are connected to relics from the collapsing phase of our Universe, but more work is needed to explore that idea,\u201d said Gazta\u00f1aga.<\/p>\n

\"BlackThe entire Universe could be locked within the event horizon of a black hole – Credit: Getty Images<\/p>\n

If the Universe began inside a black hole, that would mean we could still be inside one, which is itself inside a larger, wider universe. It could even be that some of the black holes we see around us each have their own mini-cosmos, complete with their own mini-black holes.<\/p>\n

\u201cYou can think of this like a nested structure \u2013 black holes inside black holes, like Russian dolls, said Gazta\u00f1aga.<\/p>\n

That doesn\u2019t necessarily mean every one of the untold trillions of black holes in our Universe has its own miniature version of the cosmos inside it, as the size of the black hole determines how much time the tiny creation has to develop.<\/p>\n

\u201cLarge black holes (like ours) allow structure to form \u2013 galaxies, stars, planets \u2013 while smaller ones lead to universes that expand or collapse too quickly for anything interesting to happen,\u201d said Gazta\u00f1aga.<\/p>\n

\u201cThat\u2019s important, because gravitational collapse predicts far more small black holes than large ones. The fact that we live in one of the rare, very large cases might not be a coincidence \u2013 it\u2019s the only kind of Black Hole Universe where observers like us could exist.\u201d<\/p>\n

The idea of a Black Hole Universe came about when Gazta\u00f1aga and his team took a new approach to looking at how our world began.<\/p>\n

\u201cInstead of assuming the Universe began with an unexplained \u2018Bang\u2019, we reverse the approach: we start with matter collapsing into a black hole,\u201d he explains.<\/p>\n

It all comes down to what\u2019s known as the quantum exclusion principle<\/a>. In short, this means that two identical particles don\u2019t like to be doing the same thing, at the same time, in the same place.<\/p>\n

Because of this, there\u2019s a limit on how densely matter can be packed before the particles can\u2019t cram in any closer without violating the quantum exclusion principle.<\/p>\n

It\u2019s one of the reasons that stars like white dwarfs don\u2019t just collapse under their own weight.\u00a0<\/p>\n

\u201cInside a black hole, the exclusion principle still applies,\u201d said Gazta\u00f1aga. \u201cIt prevents matter from collapsing to a point [a singularity]. Instead, it slows the collapse, halts it at high density, and causes a bounce, avoiding the singularity altogether.\u201d<\/p>\n

Relic black holes<\/p>\n

While the idea that the Universe started with a Big Bang works perfectly on paper, cosmologists won\u2019t know if the idea is correct until they test it.<\/p>\n

Fortunately, the theory makes several predictions about what our Universe should look like, which astronomers can use to test the theory.<\/p>\n

\u201cFor example, it predicts the Universe is slightly curved \u2013 positively curved like a sphere \u2013 not exactly flat,\u201d said Gazta\u00f1aga.<\/p>\n

\"FuzzyThe first direct visual evidence of a black hole (the one at the centre of the elliptical galaxy Messier 87 in the Virgo constellation) was captured by the Event Horizon Telescope in April 2017. – Photo credit: EHT Collaboration<\/p>\n

While most efforts to measure the Universe\u2019s curvature have found it to be flat, there could be a subtle bending that they haven\u2019t been sensitive enough to measure. This is why the European Space Agency\u2019s Euclid spacecraft is currently making the most accurate measurement of cosmic curvature ever taken, though it\u2019s not due to finish until 2030.<\/p>\n

\u201cIt also predicts the existence of\u00a0relic black holes\u00a0and\u00a0relic neutron stars \u2013 objects formed in the collapsing phase that survive through the bounce and might still be around today,\u201d said Gazta\u00f1aga.<\/p>\n

These would have influenced how the galaxies and stars grew over time. It could be possible to detect the signature of these relics in our current view of the Universe and discover whether we really are living inside a black hole.<\/p>\n

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