New spin on Einstein's non-symmetric metric tensor [PDF]
Richard T. HammondA solution to the gravitational field equations based on a non-symmetric metric tensor is examined. Unlike Einstein's interpretation of electromagnetism, or Moffat's generalized gravity, it is shown that the non-symmetric part of the metric tensor is the potential of the spin field. This is in agreement with string theory and provides a natural coupling between gravitation and strings.View original: http://arxiv.org/abs/1207.5170
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