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PCOS Science Goals

Test the validity of Einstein's General Theory of Relativity and investigate the nature of spacetime

Einstein's General Theory of Relativity is one of the most cherished fundamental theories of physics. But this description of gravity is widely expected to be incomplete because of its lack of a quantum foundation. The electromagnetic, weak, and strong forces, by contrast, are well defined by quantum mechanics. Most tests of General Relativity have been done in low gravitational fields, e.g., within the Solar System. Among the most stringent tests to date are the binary pulsar observations where the effects of gravitational radiation are important. However, the best tests would be in the most extreme conditions, near the event horizons of black holes, and where black holes are interacting at close range, particularly where velocities are an appreciable fraction of the speed of light. General Relativity makes specific predictions about how the light emitted from material in the inner-most regions around a black hole is distorted and gravitationally redshifted. Detailed observations of that light will provide stringent tests of strong gravity. General relativity also predicts that the inspiral of two massive objects will perturb spacetime and generate gravitational waves. The most extreme conditions and hence the strongest gravitational wave signals exist during the merger of massive black holes. Studying gravity in these strong field limits will provide essential tests of General Relativity and the nature of spacetime.


Program News and Announcements

17 Oct 2017
NASA has selected NASA LISA Study Team members to help prepare the LISA Decadal survey science case; identified Study Office members, including a core team who will work closely with the study team members; and nominated representatives to ESA's LISA Science Study Team.
10 Oct 2017
PCOS 2017 Program Annual Technology Report (PATR) released. »  [PDF]
02 Oct 2017
Note: Deadline for Nominations to the Executive Committee of the PhysPAG extended until 16 Oct 2017 »  [PDF]
26 Sep 2017
XARM Participating Scientists proposals due 24 Oct 2017 »  Details

Project News

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  • NASA Official: Phil Newman
  • Web Curator: Pat Tyler
Goddard Space Flight Center