Abstract
We discuss the physics of quarks and gluons in the nuclear wave function at very high energies. We show that the density of gluons and quarks in the nuclear structure functions can become very large as the energy of the nucleus increases. This leads to parton recombination in the nuclear wave function, which compensates the parton branching to keep the parton density from exceeding the maximum physically possible value. The effect is known as parton saturation. We derive an equation governing the structure functions in the saturation regime and present a solution of this equation. We will argue that eRHIC collider would be an ideal machine to study the strong gluonic fields associated with the saturation regime in the nucleus.
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