Related papers: Einstein spacetimes with recurrent lightlike vecto…

Einstein's Special Theory of Relativity was proposed a little over a hundred years back. It remained a bedrock of twentieth century physics right up to Quantum Field Theory. However, the failure over several decades to provide a unified…

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This paper has been withdrawn by the author and replaced by arXiv:0809.4751

Paper withdrawn by author. New treatment is in preparation.

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The presence of a non-zero cosmological term in Einstein field equations can be interpreted as the physical possibility for preferred reference frames without breaking of general covariance. This possibility is used in the process of…

This paper has been withdrawn by the authors. We have discovered an error in the evaluation of the diagram, which invalidates our conclusion.

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This comment has been withdrawn by the authors due to crucial error.

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This paper has been withdrawn by the author. The most updated version can be accessed by arXiv:1806.07290.

The paper has been withdrawn because the research work is still in progress.

This paper has been withdrawn by the author due to a necessity of further editing. (Will be resubmitted here or elsewhere in editted form.)

We prove that, contrary to the situation with time-like and space-like parallel vector fields, there are real gravitational fields satisfying Einsteins equations of gravity and admitting nontrivial light-like parallel vector fields; we…

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This paper has been withdrawn by the author.