FTP what is this cosmological mystery, once called his "greatest mistake" by Einstein?
In one theory of this, the equation of state parameter w is equal to -1, implying a density strictly independent of the scale factor, although w can range between 0 and -1 in other theories, known as "quintessence." In all cases, however, this implies that the pressure exerted is negative, causing the universe to feel an accelerating force, rather than deceleration caused by normal matter and energy. FTP what is this cosmological mystery, once called his "greatest mistake" by Einstein?
In one theory of this, the equation of state parameter w is equal to -1, implying a density strictly independent of the scale factor, although w can range between 0 and -1 in other theories, known as "quintessence."
{dark energy} or {cosmological constant} (prompt on early "quintessence")