Black holes are weird: In 2018, a team of mathematicians said that some black holes in a growing universe like us could press the reset button on the content history, effectively erasing the past and future. I calculated that I could do it. With a huge question mark.
No one guesses exactly what it looks like from the observer’s point of view. But if that turns out to be true, we may finally get a solution to one of the most important questions in modern cosmology.
When we draw a logical conclusion according to the laws of physics, the entire mass of a collapsed star gets squeezed into an infinitely small point called a singularity.
It’s a bit like saying that there is volume of space containing secrets from other parts of the universe where physics itself collapses. To deal with the rule-based universe we know and these here be dragons parts of black holes, physicists apply a small one called cosmic censorship.
There are two forms of this censorship.
Within the black hole, there is a barrier deeper than the horizon of what most people hear, beyond which physics is effectively canceled, suggesting that nothing can be predicted.
This barrier conveniently separates these troublesome singularities from the rest of space and time, preventing their lawlessness from becoming a pressing isssue.
On the other hand, a more powerful version of cosmic censorship holds the idea that there is no such thing as physical lawlessness. Therefore, it will be necessary to disappear this barrier and somehow keep physics happily in some form.
Peter Hinz, a mathematician at the University of California, Berkeley, has doubts about version 2.
“People are happy with the constant strong cosmological censorship that has been going on for about 20 years since the mid-1990s,” Hinz said in February 2018. “We challenge with that point of view.”
Hinz and his team studied a virtually charged, non-rotating object called the Reissner-Nordström-de Sitter black hole. Theoretically, this type of black hole has a barrier called Cauchy Horizon. Beyond Cauchy’s horizon, there is no cause or effect inside this warped landscape, but time & space are smeared smoothly into infinite moments.
Advocates of a strong cosmic censorship model argued that these horizon are obliterated by singularities with small deviations in the gravitational pull of collapsing stars. Which should eliminate Cauchy’s horizons in favor of a strong cosmic censorship model.
A 2018 study shows how the two can continue to technically coexist even with such disturbances, but only if the universe surrounding the black hole accelerates and expands rate like ours.
The reason behind this conclusion is pretty heavy, but here’s the tl version. Doctor Thanks to their charge, the Reissner-Nordstrom de Sitter black hole already has a slight internal thrust that resists the enormous attraction of gravity and subtly countering its time & space warping effects.
On the other hand, an expanding universe like us sets the limits of time and energy to the bending of physics surrounding a singularity.
The combination of these two effects protects Cauchy’s horizon to some extent, gives physics a shattering singularity, and gives an infinite moment behind a non-returning line.
In this strange area, their past objects are disconnected and there is no specific future.
Crossing into it would mean he could never return, but he would also not be crushed in-to a speck either. If you don’t know how you feel, don’t worry. Researchers are not so convinced either.
João Costa, a physicist and team member at the University of Lisbon, Portugal, explained this using familiar subject.
“When we think of Schrodinger’s cats, we know that we can assign probabilities to being live and dead cats,” Cardoso told Edwin Cartridge at physicsworld.com.
“But if the cat fell within Cauchy’s horizon, we couldn’t even calculate these probabilities.”
This makes black holes stranger even more strange than quantum mechanics madness. It really says something. This exercise is philosophical, as the Reissner-Nordström-de Sitter black hole probably doesn’t exist, but it doesn’t mean that conjcture useless.
Mathematics still works for a typical neutrally charged black hole, and they argue that this can even be observed in the gravitational wave washout from colliding black hole.
In that case, we will finally get our first tantalizing glimpse inside part of the universe that is kept secret forever.
This research was published in Physical Review Letters.