FromQuarkstoQuasars

Echos of the Big Bang: Scientists Have “First Direct Evidence of Cosmic Inflation”

Jolene CreightonMarch 17th 2014
Image of Crab nebula via NASA
Image of Crab nebula via NASA

Cosmic inflation is one of the most fundamental and important theories in the sciences. It allows us to understand the early universe and why the cosmos appears the way that it does today. In essence, the theory is used to describe a period of rapid expansion that occurred shortly after the Big Bang (notably, it states that this expansion occurred at a speed that was much faster than the speed of light).

The theory of inflation is necessary in order for scientists to be able to explain many things — the large-scale structure of the cosmos (i.e., why it is shaped the way it is and why matter is scattered in the patterns that we observe); why the universe appears homogenous across vast distances; and it explains, and is responsible for, the even distribution of the cosmic microwave background radiation (CMB).

In other words, it allows us to explain and rationalize the Big Bang.

And today (March 17th, 2014), astrophysicists  announced that they may have found the signal left in the sky by this super-rapid expansion. The findings were made by the BICEP2 telescope at the South Pole utilizing data of the cosmic microwave background radiation (the faint glow left over from the Big Bang). Inflation depends on a specific prediction: That it would be associated with waves of gravitational energy. Ultimately, these tiny waves, or ripples in the fabric of space, would have left their mark on the CMB. And it’s these tiny waves that the scientists recently observed, tiny fluctuations in the CMB afterglow.

This is a notable discovery as the data represents the first images of gravitational waves that have been described as the “first tremors of the Big Bang.” Marc Kamionkowski, one of the world’s leading theoretical physicists for his work in large-scale structures and the early history of the universe, said that the news of this discovery is extremely exciting, “It’s not every day that you wake up and learn something new about what happened one trillionth of a trillionth of a trillionth of a second after the Big Bang.” Similarly, Prof John Kovac of the Harvard-Smithsonian Center for Astrophysics, and a leader of the BICEP2 collaboration, said: “This is opening a window on what we believe to be a new regime of physics – the physics of what happened in the first unbelievably tiny fraction of a second in the Universe.”

cosmic inflation gravitational waves
Gravitational waves from inflation put a distinctive twist pattern in the polarization of the CMB Via BIPEC2

Since the scientists were able to link the gravitational waves with an epoch in the early universe in which quantum effects were exceedingly dominant, we have moved one step closer linking the fourth force – gravity itself – into a Theory of Everything. However, Kamionkowski, asserts that he is “trying to maintain a sober caution, because extraordinary results really do require extraordinary scrutiny, and the results that were announced have yet to be vetted by the outside community.”

Individuals in the astronomical community will continue to test and verify the BICEP2 findings in order to ensure their accuracy; however, the initial results are promising, as scientists have effectively ruled out most other potential causes.

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