Abstract
We propose a brane-world setup based on gauge/gravity duality in which the four-dimensional cosmological constant is set to zero by a dynamical self-adjustment mechanism. The bulk contains Einstein gravity and a scalar field. We study holographic RG flow solutions, with the standard model brane separating an infinite volume UV region and an IR region of finite volume. For generic values of the brane vacuum energy, regular solutions exist such that the four-dimensional brane is flat. Its position in the bulk is determined dynamically by the junction conditions. Analysis of linear fluctuations shows that a regime of 4-dimensional gravity is possible at large distances, due to the presence of an induced gravity term. The graviton acquires an effective mass, and a five-dimensional regime may exist at large and/or small scales. We show that, for a broad choice of potentials, flat-brane solutions are manifestly stable and free of ghosts. We compute the scalar contribution to the force between brane-localized sources and show that, in certain models, the vDVZ discontinuity is absent and the effective interaction at short distances is mediated by two transverse graviton helicities.
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ArXiv ePrint: 1704.05075
Dedicated to the memory of Pierre Binetruy, a fine scientist and a leader.
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Charmousis, C., Kiritsis, E. & Nitti, F. Holographic self-tuning of the cosmological constant. J. High Energ. Phys. 2017, 31 (2017). https://doi.org/10.1007/JHEP09(2017)031
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DOI: https://doi.org/10.1007/JHEP09(2017)031