Normally set to zero in planetary and galactic situations, FTP, what is this quantity, denoted by a capital lambda, which Einstein called "the biggest blunder of my life"?
It exists because the metric tensor has a covariant derivative of zero; therefore it is also a candidate to appear in the metric part of Einstein's field equation. In the weak field approximation, it is proportional to a constant mass density throughout all space. Normally set to zero in planetary and galactic situations, FTP, what is this quantity, denoted by a capital lambda, which Einstein called "the biggest blunder of my life"?
It exists because the metric tensor has a covariant derivative of zero; therefore it is also a candidate to appear in the metric part of Einstein's field equation.
{cosmological constant}