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Paper   IPM / P / 7936
School of Physics
  Title:   On Supergravity Solutions of Branes in Melvin Universe
1.  M. Alishahiha
2.  B. Safarzadeh
3.  M.H. Yavartanoo
  Status:   Published
  Journal: JHEP
  Vol.:  01
  Year:  2006
  Pages:   153
  Supported by:  IPM
We study supergravity solutions of type II branes wrapping a Melvin universe. These solutions provide the gravity description of non-commutative field theories with non-constant non-commutativity parameter. Typically these theories are non-supersymmetric, though they exhibit some feature of their corresponding supersymmetric theories. An interesting feature of these non-commutative gauge theories is that there is a critical length in the theory in which for distances larger than this length the effects of non-commutativity become important and for smaller distances these effects are negligible. Therefore we would expect to see this kind of non-commutativity in large distances which might be relevant in cosmology. We also study M5-brane wrapping on 11-dimensional Melvin universe and its descendant theories upon compactifying on a circle.

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