Astrophysicists Question Gravity Wave Discovery: Scientist Questions BICEP2 Finding
On March 17, astrophysicists announced they had discovered evidence of gravity waves left over from the time of the supposed big bang, which was believed in the scientific community to be confirmation of the big-bang theory's cosmic inflation.
The researchers, using the South Pole telescope for the experiment named BICEP2, found further evidence to support the idea that the universe is expanding and began its expansion, not in a uniform manor but with an exponential inflationary spasm, The Washing Post reported.
However, like all groundbreaking discoveries, it must go through the rigorous process of being doubted and questioned by the world's top scientists before it can be considered true. As the late and famous astronomer Carl Sagan put it, "Extraordinary claims demand extraordinary evidence."
Since the discovery, the team has been met with stark criticism from some astrophysicists who said they believe the experiment merely detected the dust from our own Milky Way Galaxy rather than finding gravity waves.
Uros Seljak, a physics and astronomy professor at the University of California at Berkeley, told the Post that the polarization of ancient radiation the researchers found could have possibly been produced by primordial gravity waves in combination with space dust in the foreground.
"They have very nice measurements of something. We don't know what that something is," Seljak said. "We can't tell if BICEP2 has measured dust or has measured gravity waves."
Although Harvard astronomer John Kovac, one of BICEP2's leading researchers, insisted that the team's measurement of B-modes, which is the polarization of light created from gravity waves, are accurate, he said he understands the discovery comes with a degree of uncertainty.
"We are very confident that we have measured B-modes with high statistical significance in the sky, and we have looked at them in multiple way," Kovac said. "And the data suggest they are unlikely to be dominated by galactic foregrounds. That is not to say that there is not uncertainty about that."
The European Space Agency is expected to present new data this fall once its Plank Space Telescope finishes scanning the cosmos for microwave background radiation similar to BICEP2's process, which only looked at a small patch of space.