Astrophysicists are surprised that extremely black holes have “gravitational hair” that can shrink

The artist’s concept of a rotating black hole that increases matter through a collection disk and releases a jet. Credit: NASA / JPL-Caltech

Black holes are considered one of the most mysterious objects in the universe. Part of their plot lies in the fact that they are, in fact, one of the simplest solutions to Einstein’s general relativity equations. In fact, black holes can only be fully characterized by three physical quantities: mass, rotation, and load. Because there are no additional “hairy” attributes to distinguish them, black holes are called “hairless”: Black holes with the same mass, rotation, and load are completely compatible with each other.

Dr. Theiss Studies. Lior Burko, a former student at Dartmouth University in Massachusetts and Gaurav Khanna, a professor at the University of Rhode Island. A special kind along with Subir Sabharwal black hole black hole violates the uniqueness, the “no hair” theorem. Specifically, the group explored extreme black holes – holes that were “saturated” with the maximum load or rotation they could carry.

They found that a black hole was a quantity that could be constructed from a spatial curvature that was protected and measured by an observer lying on the horizon. This amount violates the specificity of the black hole, as it depends not only on the three classical attributes, but also on how the black hole is formed.

This amount constitutes “gravity hair” and can be potentially measured by gravitational wave observatories in the near and future. LIGO and LISA. This new hair structure tracks the development of a similar amount found in the context of a simpler “toy” model using scalar area and spherical black holes by Angelopoulos, Aretakis, and Gajic, and extends to rotating gravity concerns. the ones.

“This new result is surprising,” Burko said, “because the black hole uniqueness theorems are well-established and especially extended to extreme black holes. There must be a hypothesis of unsatisfied theorems to explain how the theorems do not apply in this case.” continued and determined that although the external concerns of extreme black holes rot as they do for ordinary black holes, certain areas of concern develop indefinitely along the event horizon.

“Specificity theorems assume time independence. However, the Aretakis phenomenon clearly violates the independence of time along the horizon of events. This is a space where hair can be opened and combed over long distances by the gravitational wave observatory. ” Unlike other studies that have found hair in black hole scalarization, Burko noted that “we are working with vacuum Einstein’s theory without additional dynamic fields that change the theory and violate the principle of Strong Equivalence.”

The team used very intensive numerical simulations to get the results. The simulations involve the use of the most advanced Nvidia graphics processing unit (GPU) with dozens of more than 5,000 cores in parallel. “Each of these GPUs can perform up to 7 trillion calculations per second; However, with such computing power, such simulations seem to take several weeks to complete, ”he said.

Given the exploratory nature of this work, in one of the best-reviewed physics journals on 26/2021, Physical examination D like a prestigious letter.

Reference: “Scars and Gravity Hair for Extreme Kerr Black Holes” by Lior M. Burko, Gaurav Khanna and Subir Sabharwal, January 26, 2021, Physical examination D.
DOI: 10.1103 / PhysRevD.103.L021502

The study was funded in part by the National Science Foundation and the Office of Marine Research. Computational sources from the UMass Dartmouth Center for Scientific Computing and Visual Research (CSCVR) were used for the study. CSCVR promotes the UMass Dartmouth mission by providing collaborative research in the field of computational science within the University and with researchers from other universities, providing high-quality discovery-based educational experiences that transcend traditional academic or departmental boundaries for undergraduate and graduate students. , National Laboratories and Industry. Khanna is the director of the Center.

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