The Theoretical and Empirical Foundation of Relativity      (Physics)
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Our understanding of gravitation, like all scientific                   knowledge, rests on a foundation of carefully interpreted                       experimental results.  Adding to this base is a challenge for                   theorists and experimenters.  The effects one must study and try                to observe in order to distinguish between competing ideas and                  theories are subtle and minute.  In this project possible effects               of gravitation in a special binary star system and in atoms and                 nuclei are studied.  Though vastly different settings, each                     offers the opportunity to learn something new about gravity.                            The binary pulsar PSR 1913+16 is a unique testing ground for            relativistic gravity.  The pulsar emits a steady stream of radio                pulses as it orbits a companion star.  Careful interpretation of                the variation in the rate at which we receive these radio pulses                will enable the reconstruction of the orbit and the testing of                  our ideas about gravity.  The first evidence for the existence of               gravitational radiation comes from the study of this system.                    This evidence grows stronger as more data accumulates.                                  The idea that gravity is described by a geometrical                     structure of space and time is common to all metric theories of                 gravity.  General relativity is such a theory.  To test this most               fundamental idea, Einstein's equivalence principle effects on                   atoms and nuclei which move through a gravitational field are                   studied.
{'FirstName': 'Mark', 'LastName': 'Haugan', 'PI_MID_INIT': 'P', 'PI_SUFX_NAME': None, 'PI_FULL_NAME': 'Mark P Haugan', 'EmailAddress': 'mph@physics.purdue.edu', 'NSF_ID': '000448306', 'StartDate': '07/01/1987', 'EndDate': None, 'RoleCode': 'Principal Investigator'}
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{'Code': '1244', 'Text': 'Gravity Theory'}
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