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Stress–energy tensor
The
stress–energy tensor
(sometimes
stress–energy–momentum tensor
or
energy–momentum tensor
) is a
tensor
quantity in
physics
that describes the
density
and
flux
of
energy
and
momentum
in
spacetime
, generalizing the
stress tensor
of
Newtonian physics
. It is an attribute of
matter
,
radiation
, and non-gravitational
force field
s. The stress–energy tensor is the source of the
gravitational field
in the
Einstein field equations
of
general relativity
, just as mass density is the source of such a field in
Newtonian gravity
.
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