Results 1 - 10 of 3026
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[en] We consider the effect of quantum interactions on Pauli-Fierz massive gravity. With generic graviton cubic interactions, we observe that the 1-loop counterterms do not conform to the tree level structure of Pauli-Fierz action, resulting in the reappearance of the sixth mode ghost. Then to explore the quantum effects to the full extent, we calculate the resummed graviton propagator with an arbitrary interaction and analyze its complete structure, from which a minimal condition for the absence of the ghost is obtained.
[en] We study the large N anomalous dimensions of operators in a Leigh–Strassler deformation of N=4 super Yang–Mills theory. The operators that we study have a bare dimension of order N (so that the large N limit is not captured by planar diagrams) and are AdS/CFT dual to giant gravitons. The diagonalization of the dilatation operator factorizes into two problems. One of these problems is solved using a double coset ansatz. The second problem is equivalent to a set of decoupled harmonic oscillators
[en] The fermion-graviton system at linearized level in a (2+1)-dimensional space-time with the gravitational Chern-Simons term is studied. In this approximation it is shown that this system presents anomalous rotational properties and spin, in analogy with the gauge field-matter system. (A.C.A.S.)
[pt]O sistema fermion-graviton a nivel linearizado num espaco de tempo de dimensao (2+1) com termo gravitacional Chern-Simons e estudado. Nesta aproximacao mostra-se que este sistema apresenta propriedades rotacionais amomalas e spin, com amalogia ao sistema padrao campo-materia. (A.C.A.S.)
[en] A broad range of quantum field theories of gravity predict the existence of vector and scalar components of gravity in addition to the usual tensor component. These may produce effects observable at the classical level. We refer to experimental results suggestive of the appropriate effects and show that a clear, low-energy test of these theories may be made by measuring the gravitational acceleration of antiprotons in the Earth's field
[en] We show that the LHC will be able to differentiate between a four-dimensional model with quantum gravity at ∼ 1 TeV where the (massless) graviton becomes strongly coupled to standard model particles at 1 TeV and brane world type models with a large extra-dimensional volume and massive Kaluza-Klein gravitons. We estimate that the 14 TeV LHC could put a limit of the order of ∼ 5 TeV on the four dimensional Planck mass in a model independent way.
[en] In this paper, we extend our 10-dimensional (macroscopic and microscopic) analysis of an M2-brane giant graviton in the AdS7xS4 background [R. Abbaspur, From a giant M2 to a giant D2, Nucl. Phys. B 816 (2009) 73] to the case of an M2-brane dual giant in the AdS4xS7 geometry.