I received an email from a relative, asking if the newly
discovered “missing link” in astronomy now solves all the known mysteries. My
original response was a defiant “No”—for how could observation of polarized
light from gravitational
waves at the time of the Big Bang, thereby proving inflation, be the answer
to all of our mysteries? It definitely does not help answer the question of “how far away is epsilon Aurigae?”
But it got me thinking about what impact this amazing finding will actually
have on physics. Does it really solve all mysteries?
The published figure shows polarization (the lines) “ripples”
in the Cosmic Microwave Background (CMB), which were created during the
inflationary period at the beginning of the universe. The lines show how the
light/radiation/CMB is polarized. (Your polarized sunglasses block out light
polarized in a certain orientation) The CMB is left-over radiation from the
beginning of the universe—it permeates everywhere (that is shown in the blue
and red). It is how the polarization “curls”
that is the signature astronomers have been looking for. This is indicative of
gravitational waves interacting with the CMB.
Now, why does this matter? The figure below gives a lot of
information, but the point is that the inflation period happened quickly and allows
for the gravitational waves to polarize the CMB. So, it is essentially proof of
how the universe came to be—it helps answer how everything is. It provides a link toward the grand unification where the strong,
weak, and electromagnetic interactions are all unified (see the 3rd
figure, here).
This is a wonderful statement from Phil
Plait of Bad Astronomy:
“Inflation is based on principles of quantum
mechanics, while gravitational waves are the purview of relativity. QM has
brought us computers, solar power, atomic energy—a huge amount of modern tech.
Relativity is critical in many aspects of our lives as well, including GPS and also nuclear power. In the past these two concepts haven’t played well together, but now we have a
direct and profound connection between them. This result is new, and we have a
long, long way to go to understand it better. There’s no way to know what will
result from this. Yet. But whenever we open up new fields of science, all sorts
of interesting things follow. Bet on it.”