Next Generation Very Large Array Memo No. 9 Science Working Group 4:
  Time Domain, Fundamental Physics, and Cosmology
  We report here on key science topics for the Next Generation Very Large Array
in the areas of time domain, fundamental physics, and cosmology. Key science
cases considered are pulsars in orbit around the Galactic Center massive black
hole, Sagittarius A*, electromagnetic counterparts to gravitational waves, and
astrometric cosmology. These areas all have the potential for ground-breaking
and transformative discovery. Numerous other topics were discussed during the
preparation of this report and some of those discussions are summarized here,
as well. There is no doubt that further investigation of the science case will
reveal rich and compelling opportunities.
