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11 papers · 2 filters
On ekpyrotic brane collisions
Syksy Rasanen
We derive the five-dimensional metrics which describe a non-singular boundary brane collision in the ekpyrotic scenario in the context of general relativity, taking into account br…
BRST Properties of New Superstring States
Dimitri Polyakov
Brane-like states are defined by physical vertex operators in NSR superstring theory, existing at nonzero pictures only. These states exist both in open and closed string theories,…
The spectrum of strings on BTZ black holes and spectral flow in the SL(2,R) WZW model
Samuli Hemming, Esko Keski-Vakkuri
We study the spectrum of bosonic string theory on rotating BTZ black holes, using a SL(2,R) WZW model. Previously, Natsuume and Satoh have analyzed strings on BTZ black holes using…
SUSY breaking in orbifold models
M. Chaichian, A. Kobakhidze, M. Tsulaia
We consider the problem of supersymmetry breaking in 5 dimensional N=1 supersymmetric models with compactification.
Hubble Law and Brane Matter after Ekpyrosis
Kari Enqvist, Esko Keski-Vakkuri, Syksy Rasanen
We study brane matter in the ekpyrotic scenario and observe that in order to obtain standard gravity on the visible brane, the tension of the visible brane should be positive. If t…
Noncommutative Gauge Field Theories: A No-Go Theorem
M. Chaichian, P. Prešnajder, M. M. Sheikh-Jabbari +1
Studying the general structure of the noncommutative (NC) local groups, we prove a no-go theorem for NC gauge theories. According to this theorem, the closure condition of the gaug…