De Sitter Galileon

被引:76
作者
Burrage, Clare [1 ]
de Rham, Claudia [1 ]
Heisenberg, Lavinia [1 ]
机构
[1] Univ Geneva, Dept Phys Theor, CH-1211 Geneva, Switzerland
关键词
modified gravity; cosmological applications of theories with extra dimensions; GRAVITY; EQUATIONS; SPACE;
D O I
10.1088/1475-7516/2011/05/025
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We generalize the Galileon symmetry and its relativistic extension to a de Sitter background. This is made possible by studying a probe-brane in a flat five-dimensional bulk using a de Sitter slicing. The generalized Lovelock invariants induced on the probe brane enjoy the induced Poincare symmetry inherited from the bulk, while living on a de Sitter geometry. The non-relativistic limit of these invariants naturally maintain a generalized Galileon symmetry around de Sitter while being free of ghost-like pathologies. We comment briefly on the cosmology of these models and the extension to the AdS symmetry as well as generic FRW backgrounds.
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页数:14
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