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In each case that has been understood, the minimum of the tachyon potential always corresponds to some kind of stable background. Thus the tachyon reflects the instability of the original background to decay into the new background. Success of this analysis raises hope that perhaps the tachyon in (25+1) dimensional bosonic string theory may also be understood in a similar manner. Vol. 4, 2003 Tachyons in String Theory S41 References [1] A. Sen, JHEP 9808, 012 (1998) [arXiv:hep-th/9805170]. [2] A.
This absence is forced on us by the requirement of diffeomorphism invariance (or ‘general covariance’ ). This is a key difference and it causes a host of conceptual as well as technical difficulties in the passage to quantum theory. For, most of the techniques used in the familiar, Minkowskian quantum theories are deeply rooted in the availability of a flat back-ground metric. It is this structure that enables one to single out the vacuum state, perform Fourier transforms to decompose fields canonically in to creation and annihilation parts, define masses and spins of particles and carry out regularizations of products of operators.
G. K. and Theory Group CERN 1211 Geneva 23 Switzerland Ann. Henri Poincar´e 4, Suppl. 1007/s00023-003-0904-3 Annales Henri Poincar´ e Tachyons in String Theory Ashoke Sen Abstract. We describe some of the recent developments in our understanding of the tachyon in string theory. In this talk I shall try to address the following topics: 1. What are tachyons? 2. Dealing with tachyons in quantum field theory 3. Tachyons in string theory 4. Making sense of string theory tachyons 5. Possible application to cosmology 6.