The Hunt for a Fundamental Theory of Quantum Gravity – fastbn

The Hunt for a Fundamental Theory of Quantum Gravity


The world of Bousso’s new theorem is still leaving our universe in remarkable ways. For mathematical comfort, he assumed that there is an unlimited variety of items – an unrealistic assumption that makes some physicists wonder if this third layer matches the reality (with its 17 or more known items) better than the second layer. “We don’t have an endless number of quantitative fields,” said Edgar ShaghoulianPhysicist at the University of California, Santa Cruz.

However, for some experts, Bousso’s work delivers a satisfactory denunciation to the story of Penrosa and Wall, despite his unreal abundance of items. It establishes that singulars cannot be avoided, even in space times with mild reactions to quantum matter. “Just adding small quantitative corrections, you can’t interfere with the singular,” Ponington said. The work of a wall and bousso “responds so quite definitely.”

The real singular

But Bousso’s theorem does not yet guarantee that singular must be formed in our universe.

Some physicists endure hope that the dead go away. What seems like a single could actually connect to someone else. In the case of a black hole, maybe these light rays end in another universe.

And a lack of a large Bang singular could imply that our universe began with “great bounce.” The idea is that a previous universe, because it collapsed under the drawing of gravity, somehow avoided the formation of a single and instead bounced into a period of expansion. Physicists who develop bounce theories often work in the second layer of the onion, using semicular physics that exploits negative energy quantitative effects To get around the singular required by the theorems of Penrose and Hawking. Considering the newer theorems, they will now need to swallow the uncomfortable truth that their theories also violate the widespread second law.

One physicist chasing rebounds, Surjeet Rajendran from Johns Hopkins University, says he is undisputed. He points out that not even the widespread second law is gospel truth. Rejecting it would enable singular and continuations of space-time possible.

Singularity skeptics can also attract the theory at the core of the onion, where space-time behaves in really quantitative ways, such as taking over positions. There, nothing can be given to certain. It is difficult to define the concept of an area, for example, it is therefore not clear what form the second law should take, and therefore the new theorems will not hold.

Bousso and the same physicists, however, suspect that a very quantum arena with no notion of an area is equal to a light ray, and because something would be recognized as a single must persist in the core theory and in our universe. The beginning of the cosmos and the hearts of black holes would really mark edges of the map where watches cannot mark and space stops.

“Inside black holes, I’m positive that there is some notion of singular,” said Netta EngelhardtA physicist at MIT, who worked with a wall.

In this case, the still unknown fundamental theory of quantum gravity would not kill singular but to demit them. This more true theory would allow physicists to ask questions and calculate significant answers, but the language of those questions and answers would change dramatically. Space time quantities as a position, curvature and duration could be useless to describe a singular. There, where time ends, other amounts or concepts may have to take their place. “If you were to guess me,” Ponington said, “whatever quantum state describes the singular itself has no notion of time.”


Original story reprinted with permission of How much magazine,, Edit independent publication of the Simons Foundation whose mission is to improve public understanding of science by coverage of research developments and trends in mathematics and the physical and life sciences.



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