Computer simulation demonstrates formation of first stars after Big Bang

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Washington, August 1 : Scientists have developed a computer simulation that demonstrates how gas and dust came together in the early universe to form the first stars after the Big Bang.

Researchers believe that our universe began with the Big Bang about 13 billion years ago, and that soon after that event, matter began to form as small dust grains and gases.

How the first stars formed from this dust and gas has been a burning question for years. The question of how the first stars evolved is so important because their formations and eventual explosions provided the seeds for subsequent stars to come into being.

Now, a state-of-the-art computer simulation offers the most detailed picture yet of how these first stars in the universe came into existence.

The composition of the early universe was quite different from that of today, and the physics that governed the early universe were also somewhat simpler.

Dr. Naoki Yoshida and colleagues in Japan and the US incorporated these conditions of the early universe, sometimes referred to as the "cosmic dark ages," to simulate the formation of an astronomical object that would eventually shine its light into this darkness.

The result is a detailed description of the formation of a protostar - the early stage of a massive primordial star of our universe - and the researchers' computer simulation, which has been called a "cosmic Rosetta Stone," sets the bar for further investigation into the star formation process.

According to their simulation, gravity acted on minute density variations in matter, gases, and the mysterious "dark matter" of the universe after the Big Bang in order to form this early stage of a star - a protostar with a mass of just one percent of our sun.

The simulation reveals how pre-stellar gases would have actually evolved under the simpler physics of the early universe to form this protostar.

Dr. Yoshida's simulation also shows that the protostar would likely evolve into a massive star capable of synthesizing heavy elements, not just in later generations of stars, but soon after the Big Bang.

"This general picture of star formation, and the ability to compare how stellar objects form in different time periods and regions of the universe, will eventually allow investigation into the origins of life and planets," said Lars Hernquist, a Professor of Astronomy at Harvard University.

Their simulation of the birth of a protostar in the early universe signifies a key step toward the ambitious goal of piecing together the formation of an entire primordial star and of predicting the mass and properties of these first stars of the universe.

ANI

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