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This paper has been withdrawn by the authors, due to a mistake pointed out by Lenny Ng and Josh Sabloff.

This paper has been withdrawn due to a photometric calibration error.

This paper has been withdrawn by the author due to a critical error in the proof of Theorem A pointed out by Burkhard Wilking.

This paper was withdrawn by the authors due an error in the elimination of the front in the linearized interior equations (28)-(29).

This paper has been withdrawn due to an error, and no further revisions will be made.

The paper is withdrawn due to mistakes in the proofs for Proposition 1.2 and Theorem 2.2.

This paper has been withdrawn by the authors as requested by the journal.

This paper has been withdrawn by the author due to a crucial error

This paper has been withdrawn by the author, because it is now part of an enlarged version entitled "Time functions as utilities" arXiv:0909.0890

This paper has been withdrawn by the author

The effect of the random quantum transverse field $\Omega$

This paper was withdrawn by the authors.

This paper has been withdrawn by the author due to a crucial sign error in Proposition 3.1.

This paper has been withdrawn by the author(s), due a mistake of factor 1/2.

This paper is withdrawn. We found a mistake in Lemma 4.1

This paper is withdrawn because of an error in Lemma 3.1

This paper has been withdrawn by the author(s), due to a crucial error in eq. 6.

This paper has been withdrawn by the author.

This paper has been withdrawn by the authors, due a crucial mistake in Lemma 2

This paper has been withdrawn due to an error. We plan to replace it with a corrected version.