Troubles with Spacetime Noncommutative Theories: Tachyons or S-branes?
arXiv:hep-th/0310123 · doi:10.1088/1126-6708/2004/05/053
Abstract
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.
arXiv comment10 pages, references added, more solutions added, reference added
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Cited by in corpus (9)
- Unitary Quantum Physics with Time-Space Noncommutativity
- Non-conformality of gamma_i-deformed N=4 SYM theory
- Quantum Stability for the Heisenberg Ferromagnet
- Some properties of the integrable noncommutative sine-Gordon system
- Space-time non-commutativity tends to create bound states
- Noncommutative Electrodynamics with covariant coordinates
- Topics in noncommutative integrable theories and holographic brane-world cosmology
- Scalar Hair of Global Defect and Black Brane World
- Pulsating Strings in Deformed Backgrounds