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Carbon, carbon everywhere, but not from the Big Bang

Date:
May 11, 2011
Source:
North Carolina State University
Summary:
As Star Trek is so fond of reminding us, we're carbon-based life forms. But the event that jump-started the universe, the Big Bang, didn't actually produce any carbon, so where the heck did it -- and we -- come from? A researcher has helped create supercomputer simulations that demonstrate how carbon is produced in stars, proving an old theory correct.
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Afterglow of the Big Bang. A full-sky map of the oldest light in the universe. Colors indicate "warmer" (red) and "cooler" (blue) spots. The oval shape is a projection to display the whole sky; similar to the way the globe of the earth can be represented as an oval.
Credit: NASA/WMAP Science Team

As Star Trek is so fond of reminding us, we're carbon-based life forms. But the event that jump-started the universe, the Big Bang, didn't actually produce any carbon, so where the heck did it -- and we -- come from? An NC State researcher has helped create supercomputer simulations that demonstrate how carbon is produced in stars, proving an old theory correct.

More than 50 years ago, an astronomer named Fred Hoyle deduced that when three helium nuclei -- or alpha particles -- come together inside the core of a star, they have difficulty combining to form carbon-12, the stuff we're made of. So he predicted a new state of carbon-12, one with an energy tuned just right to make the formation of carbon possible in stars. This new state is now known as the Hoyle state. Later experimentation demonstrated that the theory was correct, but no one had ever been able to reproduce the Hoyle state from scratch, starting from the known interactions of protons and neutrons. If the Hoyle state didn't show up in those calculations, then the calculations must be incorrect or incomplete.

NC State physicist Dean Lee, along with German colleagues Evgeny Epelbaum, Hermann Krebs, and Ulf-G. Meissner, had previously developed a new method for describing all the possible ways that protons and neutrons can bind with one another inside nuclei. This "effective field theory" is formulated on a complex numerical lattice that allows the researchers to run simulations that show how particles interact. When the researchers put six protons and six neutrons on the lattice, the Hoyle state appeared together with other observed states of carbon-12, proving the theory correct from first principles.

"We've had simple models of the Hoyle state using three alpha particles for a long time, but the first principles calculations weren't giving anything close," Lee says. "Our method places the particles into a simulation with certain space and time parameters, then allows them to do what they want to do. Within those simulations, the Hoyle state shows up."

Their research appears in the May 13 issue of Physical Review Letters.

Lee adds, "This work is valuable because it gives us a much better idea of the kind of 'fine-tuning' nature has to do in order to produce carbon in stars."


Story Source:

The above post is reprinted from materials provided by North Carolina State University. Note: Materials may be edited for content and length.


Journal Reference:

  1. Evgeny Epelbaum, Hermann Krebs, Dean Lee, Ulf-G. Meißner. Ab Initio Calculation of the Hoyle State. Physical Review Letters, 2011; 106 (19) DOI: 10.1103/PhysRevLett.106.192501

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North Carolina State University. "Carbon, carbon everywhere, but not from the Big Bang." ScienceDaily. ScienceDaily, 11 May 2011. <www.sciencedaily.com/releases/2011/05/110511131134.htm>.
North Carolina State University. (2011, May 11). Carbon, carbon everywhere, but not from the Big Bang. ScienceDaily. Retrieved July 31, 2015 from www.sciencedaily.com/releases/2011/05/110511131134.htm
North Carolina State University. "Carbon, carbon everywhere, but not from the Big Bang." ScienceDaily. www.sciencedaily.com/releases/2011/05/110511131134.htm (accessed July 31, 2015).

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