Abstract
Motivated by claims of broken rotational invariance in the WMAP data, a number of models have appeared in the literature realizing this effect through vector field(s) with a nonvanishing spatial vacuum expectation value. We discuss why many such models have ghost instabilities.
Original language | English (US) |
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Pages (from-to) | 181-186 |
Number of pages | 6 |
Journal | Theoretical and Mathematical Physics |
Volume | 170 |
Issue number | 2 |
DOIs | |
State | Published - Feb 2012 |
Bibliographical note
Funding Information:This work was supported in part by the US Department of Energy (Grant No. DE-FG02-94ER-40823).
Keywords
- broken rotational invariance
- ghost instability