Weak energy condition
= Weak energy condition
{wiki}
The weak energy condition requires
$$
T_{\mu\nu}X^\mu X^\nu\geq0
$$
for every timelike vector $X$, so every observer measures nonnegative energy density.
= Weak energy condition
{wiki}
The weak energy condition requires
$$
T_{\mu\nu}X^\mu X^\nu\geq0
$$
for every timelike vector $X$, so every observer measures nonnegative energy density.