Study shows that the GW190521 event could be explained by primordial black holes

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The most large binary black gap merger. This graphic shows a nonetheless from a numerical relativity simulation in line with GW190521. The ripples illustrate the spacetime curvature and gravitational waves produced by the pair of merging black holes. The backside shows the gravitational wave sign as a operate of time. The left shows representations of the black gap event horizons for GW190521 and different large black gap binaries detected by LIGO/Virgo. (Credit: D. Ferguson, Okay. Jani, D. Shoemaker, P. Laguna, Georgia Tech, MAYA Collaboration).

In September 2020, the LIGO/Virgo collaboration, a big group of scientists working at completely different universities worldwide, introduced that that they had detected most large gravitational wave binary sign noticed up to now, which they referred to as GW190521. In a paper published in Physical Review Letters, they explored the speculation that this sign was produced by the merger of two black holes, with no less than the main element mass in the mass hole predicted by the pair-instability supernova concept.

Researchers at Université de Genève, Technion, Sapienza University and INFN have not too long ago examined the LIGO/Virgo information additional and explored another rationalization for the GW190521 event. In their paper, additionally published in Physical Review Letters, they particularly thought of the chance that the GW190521 event could be related to primordial black holes, these produced in the early universe.

“Our paper originated from the observation by the LIGO/Virgo collaboration of the so-called GW190521 event, the merger of two black holes,” Antonio Riotto, considered one of the researchers who carried out the examine, informed Phys.org. “The more massive black hole turns out to be in the so-called mass gap, that is, in a range of masses where astrophysical arguments are deficient in explaining the astrophysical nature of such a black hole. Our primary objective was to understand if the event could have an explanation within the primordial black hole scenario, i.e., by those black holes that are generated in the early universe and whose masses may fall in the mass gap without any problem.”

To look at the chance that a sign is related to the so-called primordial black gap state of affairs, one can compute the price at which two black holes of primordial origin merge (i.e., their merger price) to provide a gravitational wave sign. Subsequently, researchers should examine this prediction to the merger price that would be wanted to elucidate the sign noticed.

“Matching such a prediction to the observed rate needed to explain the GW190521 event, we found the parameters of the scenario [that were] needed and checked whether they escaped the current constraints from other experiments, e.g., those from cosmic microwave background (CMB) constraints,” Riotto mentioned. “Indeed, it turns out that the GW190521event may be explained by our initial primordial black hole hypothesis.”

Riotto and his colleagues demonstrated that the GW190521 event noticed by the LIGO/Virgo collaboration could be theoretically explained by the merger of primordial black holes. In the future, their work could thus inform different research aimed toward confirming the existence of primordial black holes. Meanwhile, the researchers plan to discover the chance that different occasions detected by LIGO/Virgo collaboration originated from primordial black holes.

“As part of the ongoing effort to establish the existence of primordial black holes using current and future gravitational wave data, we have organised a workshop bringing together scientists studying black holes from both the primordial and the astrophysical communities, as well as members of the LIGO/Virgo collaboration, with the aim of creating synergies between experts of different fields,” Gabriele Franciolini, one other researcher concerned in the examine, informed Phys.org. “With more than 300 participants, the large participation proves the widespread interest of the scientific community in this exciting line of research.”


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More info:
GW190521 mass hole event and the primordial black gap state of affairs. Physical Review Letters(2021). DOI: 10.1103/PhysRevLett.126.051101

GW190521: A binary black gap merger with a complete mass of 150  M⊙. Physical Review Letters(2021). DOI: 10.1103/PhysRevLett.125.101102

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Study shows that the GW190521 event could be explained by primordial black holes (2021, March 5)
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