Research in Gravitation Theory (Physics)
{'Code': '03010700', 'Directorate': {'Abbreviation': 'MPS', 'LongName': 'Direct For Mathematical & Physical Scien'}, 'Division': {'Abbreviation': 'PHY', 'LongName': 'Division Of Physics'}}
{'SignBlockName': 'Richard Isaacson', 'PO_EMAI': None, 'PO_PHON': None}
Research on three major problems concerned with the early               universe will be conducted:                                                             The first consists of solving the semiclassical backreaction            equations when nonconformally coupled free scalar fields are                    present in homogeneous and isotropic spacetimes.  Two aspects of                this are of particular interest.  One is the initial behaviors of               the solutions, as that will determine whether they have initial                 singularities or particle horizons.  The second is how                          Starobinsky's inflationary models and the R  models of Mijic et.                al. are affected by the presence of non-conformal fields during                 the inflationary phase.                                                                 The second research project consists of solving the                     backreaction problem for free scalar fields in anisotropic                      spacetimes.  It is of interest to see whether quantum effects                   change the nature of the singularities in these spacetimes.  Also               quantitative predictions for the amounts of anisotropy that can                 be dissipated in various models via particle production will be                 obtained.                                                                               The third research project will be an investigation of                  spontaneous symmetry breaking in spacetimes with compact spatial                sections for models with N scalar fields with quartic self-                     couplings.  It has already been shown that spontaneous symmetry                 breaking for these models in the large N limit does not occur in                the Einstein universe.  If this result is more general, then it                 may be of great importance to cosmology.
[{'FirstName': 'William', 'LastName': 'Hiscock', 'PI_MID_INIT': 'A', 'PI_SUFX_NAME': None, 'PI_FULL_NAME': 'William A Hiscock', 'EmailAddress': 'hiscock@physics.montana.edu', 'NSF_ID': '000467528', 'StartDate': '07/01/1987', 'EndDate': None, 'RoleCode': 'Principal Investigator'}, {'FirstName': 'Lee', 'LastName': 'Lindblom', 'PI_MID_INIT': None, 'PI_SUFX_NAME': None, 'PI_FULL_NAME': 'Lee Lindblom', 'EmailAddress': 'llindblom@ucsd.edu', 'NSF_ID': '000443137', 'StartDate': '07/01/1987', 'EndDate': None, 'RoleCode': 'Co-Principal Investigator'}]
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{'Code': '124400', 'Text': 'Gravity Theory'}
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