Can broken rotational invariance be reconciled with inflation?

M. Peloso

Research output: Contribution to journalArticlepeer-review


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 languageEnglish (US)
Pages (from-to)181-186
Number of pages6
JournalTheoretical and Mathematical Physics
Issue number2
StatePublished - Feb 2012

Bibliographical note

Funding Information:
This work was supported in part by the US Department of Energy (Grant No. DE-FG02-94ER-40823).


  • broken rotational invariance
  • ghost instability


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