Hair on black holes is extremely combable

Black holes are considered to be one of the most mysterious objects in the universe. Part of their mind arises from the fact that they are among the simplest solutions to Einstein’s field equations of general relativity. In fact, black holes can be fully identified by just three physical sizes: the mass, the spinning and the cost. Since they do not have additional “hairy” attributes to distinguish them, black holes are said to have “no hair”: Black holes are of the same mass, spinning, and cost just the same.

Dr. Lior Burko of Theiss Research in collaboration with Professor Gaurav Khanna of the University of Massachusetts Dartmouth and the University of Rhode Island along with his former student Dr. Subir Sabharwal discovered that a specific type of black hole opposes black hole homogeneity, the nickname “hairless” theorem. In particular, the team studied outer black holes – holes that are “saturated” with the most cost or spinning they can afford. They discovered that there is a size that can be picked up from orbit during space at the horizon of the preserved black hole, and can be measured by a distant observer. Because this amount depends on how the black hole was created, and not just on the three classical virtues, it goes against the unity of a black hole.

This amount includes “gravitational hair” and may be measured by recent and upcoming wave observation centers such as LIGO and LISA. The structure of this new hair follows a similar size development found by Angelopoulos, Aretakis, and Gajic in the context of a simpler “toy” model using a sleek field and spherical black holes, and extends it to rotary gravity bites. ones.

“This new result is surprising,” Burko said, “in that the particular black hole theories are well established, and in particular their extension to extreme black holes. The unsatisfied theories must be accepted, to explain how whether theories are irrelevant in this case. ” In fact, the team followed on from previous work by Aretakis, which found that while outside bumps of rotting black holes will rot as they do for regular black holes, on the horizon of the event there will be some hitting fields evolving in infinite time. “The particular theories embrace the independence of time. But the Aretakis phenomenon in particular contradicts the independence of time on the horizon of the event. This is the gap through which the hair can pop. out and combed at high speed with a tow wave observer, “Burko said. Unlike other hair-finding work in black hole scattering, Burko noted “in this work we were working with Einstein’s theory of emptiness, without additional dynamic fields that would alter the theory and potentially to go against the Principle of Strong Equality. “

The team used very intensive numerical symbols to generate their results. The simulations involved using dozens of Nvidia graphics processing units (GPUs) at their peak with more than 5,000 cores each, at the same time. “Each of these GPUs can compute up to 7 trillion seconds; however, even with computing capability like that the simulations look many weeks to complete,” Khanna said.

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Due to the progressive nature of this work, it was published on 1/26/2021 in one of the leading peer-reviewed physics journals, Corporate Review D. as a distinguished Letter. The published version is available online at: DOI 10.1103 / PhysRevD.103.L021502.

The research was part-funded by the National Science Foundation and the Office of Naval Research. The computing facilities of the UMass Dartmouth Center for Computer Science & Imaging Research (CSCVR) were used for the research work. The CSCVR furthers UMass Dartmouth’s mission by providing discovery-based high-quality educational experiences that transcend the traditional boundaries of an academic field or department, and encourages collaborative research in the computer sciences alongside within the University and with researchers at other universities. , National Labs, and industry. Khanna acts as Center Director.