Star tracks in the ghost condensate

被引:28
作者
Dubovsky, SL [1 ]
机构
[1] CERN, Div Theory, Dept Phys, CH-1211 Geneva 23, Switzerland
[2] Russian Acad Sci, Inst Nucl Res, Moscow 117312, Russia
来源
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2004年 / 07期
关键词
dark energy theory; gravity;
D O I
10.1088/1475-7516/2004/07/009
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We consider the infrared modi. cation of gravity by the ghost condensate. Naively, in this scenario one expects sizable modi. cation of gravity at distances of order 1000 km, provided that the characteristic timescale of the theory is of the order of the Hubble time. However, we argue that this is not the case. The main physical reason for the masking is the simple fact that the Earth ( and any other object in the Universe) has a velocity at least of order 10(-3)c with respect to the rest frame of the ghost condensate. Taken together with strong retardation effects present in the ghost sector, this implies that no observable modi. cation of the gravitational field of nearby objects occurs. Instead, the physical manifestation of the ghost condensate is the presence of 'star tracks' narrow regions of space with growing gravitational and ghost fields inside - along the trajectory of any massive object. We briefly discuss the possibilities for observing these tracks.
引用
收藏
页码:181 / 197
页数:17
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