Scientists Discover Hidden Force Driving Universe's Hottest Fluid

Topic: Physics

Researchers led by Yu-Gang Ma and Xu-Guang Huang studied quark-gluon plasma to understand its acceleration. They found that peak proper acceleration can reach several hundred MeV at both low and high collision energies.

Quark-gluon plasma is an extremely hot state of matter where quarks and gluons move freely. It's like a perfect fluid, but it's created when atomic nuclei crash into each other at nearly the speed of light. Scientists have been studying this material to understand conditions that existed shortly after the Big Bang.

The researchers wanted to know more about the acceleration of this plasma. They used two particle transport models and a technique called Gaussian smearing to map how acceleration forms and changes inside quark-gluon plasma. They tracked acceleration across collision energies ranging from 3.5 GeV to 2.76 TeV.

Their simulations showed that peak proper acceleration can reach several hundred MeV at both low and high collision energies. The strongest transverse acceleration points outward and appears near the outer boundary of the fireball. This edge becomes an acceleration hotspot because pressure falls rapidly there while enthalpy density remains low.

The researchers also found that the plasma behaves differently depending on the energy of the collision. At lower energies, nuclear stopping initially slows the matter down, producing deceleration of up to about 500 MeV. At ultrarelativistic energies, the nuclei pass through each other so quickly that they pull the newly created plasma into brief, intense acceleration pulses.

Why It Matters

Understanding quark-gluon plasma and its acceleration can help us better comprehend the universe's earliest moments. This knowledge may also lead to new discoveries in particle physics and our understanding of extreme matter.

Key Facts

• Quark-gluon plasma is an extremely hot state of matter created when atomic nuclei crash into each other at nearly the speed of light.
• The researchers used two particle transport models and a technique called Gaussian smearing to map how acceleration forms and changes inside quark-gluon plasma.
• Peak proper acceleration can reach several hundred MeV at both low and high collision energies.
• The strongest transverse acceleration points outward and appears near the outer boundary of the fireball.
• The researchers found that the plasma behaves differently depending on the energy of the collision.

Key Terms

Quark-gluon plasma

An extremely hot state of matter where quarks and gluons move freely.

Gaussian smearing

A technique used to map how acceleration forms and changes inside quark-gluon plasma.

Implications

Understanding quark-gluon plasma and its acceleration can help us better comprehend the universe's earliest moments. This knowledge may also lead to new discoveries in particle physics and our understanding of extreme matter.