  Dilepton production from the quark-gluon plasma (QGP) phase of
ultra-relativistic heavy-ion collisions is computed using the leading-order
(3+1)-dimensional anisotropic hydrodynamics. It is shown that high-energy
dilepton spectrum is sensitive to the initial local-rest-frame momentum-space
anisotropy of the QGP. Our findings suggest that it may be possible to
constrain the early-time momentum-space anisotropy in relativistic heavy-ion
collisions using high-energy dilepton yields.
