TY - JOUR
T1 - Troubles with spacetime noncommutative theories
T2 - Tachyons or S-branes?
AU - Bak, Dongsu
AU - Kim, Seok
PY - 2004/5/1
Y1 - 2004/5/1
N2 - We find lorentzian solutions of spacetime noncommutative gauge theories that are localized exponentially in space and time. Together with time translational invariance of the theories, we argue that perurbative S matrix formulation of such theories is problematic in the sense that the S matrix based on free in and out states misses the spacetime localized degrees. We show that, in 3+1 dimensions, the problem disappears for the cases where the noncommutativity becomes purely spatial by an appropriate Lorentz transformation or the noncommutativity is lightlike with its electric and magnetic parts orthogonal to each other.
AB - We find lorentzian solutions of spacetime noncommutative gauge theories that are localized exponentially in space and time. Together with time translational invariance of the theories, we argue that perurbative S matrix formulation of such theories is problematic in the sense that the S matrix based on free in and out states misses the spacetime localized degrees. We show that, in 3+1 dimensions, the problem disappears for the cases where the noncommutativity becomes purely spatial by an appropriate Lorentz transformation or the noncommutativity is lightlike with its electric and magnetic parts orthogonal to each other.
KW - Non-Commutative Geometry
KW - Solitons Monopoles and Instantons
UR - http://www.scopus.com/inward/record.url?scp=23044468395&partnerID=8YFLogxK
U2 - 10.1088/1126-6708/2004/05/053
DO - 10.1088/1126-6708/2004/05/053
M3 - Article
AN - SCOPUS:23044468395
SN - 1029-8479
VL - 8
SP - 1213
EP - 1222
JO - Journal of High Energy Physics
JF - Journal of High Energy Physics
IS - 5
ER -