Telescope built to capture big bang light
COLUMBIA U. (US) — A new telescope will record relics from the universe’s moment of creation in an effort to learn more about the big bang.
A team recently launched the 6,000 pound device, called EBEX, from Antarctica via a football-stadium-sized helium balloon that carried it into the upper reaches of the atmosphere.
The telescope was built to capture snapshots of light particles that were emitted when the universe was only 380,000 years old.
Most cosmologists agree that the universe started out hot, dense and microscopically small. But where did it come from, and how did it expand into its present form?
One prevailing theory suggests that, in a fraction of a second, this embryonic universe expanded faster than the speed of light, increasing in size at a greater rate than it has in the 15 billion years since.
Physicists believe that proving or disproving this theory will help them understand what existed before the big bang and why the big bang occurred in the first place. Until recently, scientists had no way of putting this hypothesis, the “inflationary cosmological model,” to the test.
If the high-powered telescope is able to capture a specific signature in that early light, called B-type polarization, it will be the first time any device has done so.
“No one has ever seen this before,” says Amber Miller, a professor of physics at Columbia University.
Much like a digital camera, the telescope takes photographs, but instead of capturing information in the form of optical light, EBEX “is designed to look at microwaves,” explains Miller.
The photons, or light particles, that the device picks up were emitted when the universe was 380,000 years old. They are part of a relic known as the cosmic microwave background, or CMB, cooled plasma leftover from the hot big bang that can still be observed today.
“Something special happened at that time,” says Miller. The plasma cooled enough to allow for photons, which had previously been bound up with electrons, to break free and travel through the universe.
“As that light got away,” she adds, “it carried with it an imprint, a photograph, of what the universe looked like before anything was formed.”
The B-type polarizations her team is looking for were created even earlier: by gravitational waves thought to have been generated during the big bang.
“If we find the signatures of those waves, that tells us something about the type of expansion that took place in that early universe and what drove it,” says Miller.
The data her team gathers will complement results recorded over the last year by a second camera, which sits atop a 17,000-foot plateau in Chile’s Atacama Desert. They are analyzing that data now and hope to publish it later this year.
“Right now is an exciting time for our group,” says Miller.
Scientists strapped the 6,000-pound telescope to a football-stadium-sized helium balloon that carried it into the upper reaches of the atmosphere. (Credit: Asad Aboobaker)
Source: Columbia University