Sure, it’s detected everywhere. From the Beeb:
A few weeks ago, physicists behind the Bicep2 experiment made headlines for detecting a strong signature of inflation – ripples in the spacetime fabric of the cosmos called gravitational waves. The pattern in the sky they saw was precisely what the inflation theorists predicted.
What’s this got to do with the multiverse? No one knows exactly how inflation occurred, but some of the simplest, most reasonable ideas suggest that random quantum fluctuations in the early Universe caused inflation to stop in some regions but not in others. Inflation would thus be eternal.
In places where inflation ceased, pocket universes would form, where atoms, stars, and even planets could assemble. Our Universe would be just be one of these myriad pocket universes.
Although inflation is widely accepted, eternal inflation remains more speculative. “I’m personally skeptical of this story,” says physicist Sean Carroll of the California Institute of Technology. Still, he says, it is plausible.
…
Scientists may simply never find direct signs of any kind of multiverse, Carroll says. For some naysayers, that means these theories are not scientific. But that misses the point, he says. “Our job as physicists is to believe what our equations tell us.” In other words, by pursuing the maths, theorists may help us discover indirect signs of the multiverse. And eventually, enough of this indirect evidence could have been assembled to suggest that the multiverse is overwhelmingly likely. More.
On that basis, ghosts are plausible too. No shortage of indirect evidence.
How did science get to be about this kind of stuff? When did the words: How, exactly? get lost?
See also: 
The Science Fictions series at your fingertips (cosmology).
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