String theory: gravitons for closed strings vs. open strings

zb23
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In the spectrum of the closed string, we encountered a graviton. Why is the symmetric 2-tensor in the open string spectrum, not a graviton?
 
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this thread is to open up discussion on Gravi-GUT as theories of everything GUT or Grand Unified Theories attempt to unify the 3 forces of weak E&M and strong force, and Gravi-GUT want to add gravity. this peer reviewed paper in a journal on Gravi-GUT Chirality in unified theories of gravity F. Nesti1 and R. Percacci2 Phys. Rev. D 81, 025010 – Published 14 January, 2010 published by Physical Review D this paper is cited by another more recent Gravi-GUT these papers and research...
In post #549 here I answered: And then I was surprised by the comment of Tom, asking how the pairing was done. Well, I thought that I had discussed it in some thread in BSM, but after looking at it, it seems that I did only a few sparse remarks here and there. On other hand, people was not liking to interrupt the flow of the thread and I have been either contacted privately or suggested to open a new thread. So here it is. The development can be traced in some draft papers...
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