At least one of the gravitative waves detected by the LIGO and Virgo detector might not be from black holes or neutron stars , but something even more alien , physicist have take . lie with as boson stars or dark matter whizz , we have no other evidence these object even exist . However , they would be utile in explaining some aspect of the macrocosm that do n’t currently make signified , as well as the exceptional features of this wave .
Gravitational undulation detectorswere found to capture unification between objects we already knew live , such as disgraceful hole and neutron star . Despite doubt as to whetherwe have detecteda merger between one of each , signs oftwo black holes collidinghave only been eclipse for recent scientific importance byneutron star fusion .
However , an extra Bob Hope for the detector was that they would find new aim , whose existence was unsure or just guessed at . An international team think one detected gravitative wave , GW190521 , might have done just that . Their bet is on a unification between two stars made from particles different from those that make up most of the familiar universe .
A comparison of the gravitational wave GW190521 as detected by the LIGO network and a simulation of two boson stars, along with a diagram of the stars' orbits degradingImage Credit: Galician Institute of High Energy Physics
boson are a class of subatomic particles with integer spin . Besides photons , which we fuck well , and theHiggs boson , where at least the name is conversant , the category include a social class of particle little get it on to non - physicists . While photons lack mass , and Higgs bosons have exceptionally unforesightful lives , it has been proposed that undiscovered bosons could form stars where they are clumped in pockets left over from the Big Bang .
" Boson stars behave very much like black holes but they are fundamentally different , as they lack the two most classifiable ( and somewhat debatable ) aspects of dim holes : their no - return surface have it off as event horizon , and the uniqueness in the interior , where laws of physics break down , ” say study generator Dr Sanchis - Gual of the University of Valencia in astatement .
If so , we might not be able to see such stars – but their great deal could contribute to the account for thefrustratingly problematic sullen matter . On their own , such boson star would be almost impossible to notice , but if two are in close-fitting orbits around each other they would produce a lasting gravitative moving ridge at the edge of our capacitance to notice . If the orbits decayed until the two maven collide , the answer would be a gravitative wave superficially similar to those we have go through .
The challenge would be tell such a undulation from one raise by two black holes . But one wafture is think to show the sign .
When GW190521 was first discover it was announced as the product of the two heavy ( and most upstage ) black gob we had yet seen merging , with a combined mass of 142 times that of the Sun .
However , contingent of the event dumbfound astronomers . For one thing , the placement appeared to bein the saucer arounda supermassive black hole , which was unexpected . Moreover , the larger objective before the uniting had a mass of 85 time that of the Sun , a size thought to be unsufferable for a single star to grow . Although a previous merger of less massive smutty golf hole offered a potential account , the event remain an oddity .
In two papers , Sanchis - Gaul and co - authors propose GW190521 ’s components are more likely to have been boson hotshot than black cakehole . They reason that the methods presently used to sue gravitative wave are design on the assumption that anything contributing to a wave , and declamatory than a sure mass , is a black hole . By scrapping these assumptions and feign what would happen if boson star merged , the team produced an outcome similar to GW190521 . They also provide grounds another gravitative wave , GW190426 , was not produced by boson star , while GW200220 in all probability was n’t either .
The fact a model matches the observation does n’t show GW190521 was a boson star merger , or even that boson stars exist . Alternative explanation for GW190521have been offered , but these also require changes to the way we picture the universe . Debates about the nature of this event will stay on for some time , but with fortune , future gravitational waving signal detection will be made that postulate fresh explanations , helping us determine which is right .
A paper on how the author searched for signs of boson stars in specific gravitative wave is published in the journalPhysical Review D.
A more worldwide word on how to march gravitational undulation data to give up for more possibilities is put out subject access in the journalPhysical Review X.
