Though many physicists believe it ’s potential that our universe of discourse is one of many in a multiverse , they fight to find concrete evidence to back up that hypothesis . But now , we may find that evidence — if we look for the wreckage go forth behind by a hit of cosmic proportions .
example by Olena Shmahalo
Over at Quanta , Jennifer Oullette explores one experimentation that could render evidence for the multiverse . It assumes that our universe was contain during a hit with another population — and that this spectacular event may have left a cosmic imprint behind that we can measure .
Writes Oullette :
Like many of her colleagues , Hiranya Peiris , a cosmologist at University College London , once largely send away the notion that our universe might be only one of many ina vast multiverse . It was scientifically challenging , she thought , but also basically untestable . She preferred to focus her research on more concrete questions , like how galaxies acquire .
Then one summer at the Aspen Center for Physics , Peiris find oneself herself chatting with the Perimeter Institute’sMatt Johnson , who remark his pastime in developing tools to study the idea . He suggested that they collaborate .
At first , Peiris was sceptical . “ I think as an observer that any hypothesis , however interesting and refined , is seriously lacking if it does n’t have testable consequences , ” she said . But Johnson convinced her that there might be a way to test the construct . If the universe that we inhabit had long ago collided with another universe , the collapse would have leave animprint on the cosmic microwave background(CMB ) , the faint afterglow from the Big Bang . And if physicist could discover such a signature , it would provide a window into the multiverse .
Erick Weinberg , a physicist at Columbia University , explain this multiverse by comparing it to a simmering cauldron , with the bubbles typify individual universes — isolate air hole of space - time . As the pot seethe , the bubbles expound and sometimes collide . A standardized process may have occurred in the first moments of the cosmos .
In the class since their initial meeting , Peiris and Johnson have studied how a collision with another universe in the former minute of time would have send something standardized to a shock wave across our universe . They think they may be able to find grounds of such a hit in data from the Planck space scope , which map the CMB .
The projection might not work , Peiris concedes . It requires not only that we live in a multiverse but also that our creation clash with another in our primal cosmic history . But if physicists succeed , they will have the first improbable evidence ofa cosmos beyond our own .
You have to scan the whole articleover at Quanta
https://www.quantamagazine.org/20141110-multiverse-collisions-may-dot-the-sky/
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