Zeldovich equation of state

Zeldovich equation of state refers to an equation of state, proposed by Yakov Zeldovich in 1962, to describe matter at ultra-high densities. It is characterized by extreme rigidity and relativistic consistency, in which the pressure is equal to the energy density. Because of this, matter obeying the Zeldovich equation of state is often referred to as a stiff fluid or stiff matter. In such a medium, the speed of sound reaches the causal upper limit, equal to the speed of light.

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