Tachyonic Quintessence and a Preferred Direction in the Sky

Details Tachyonic Quintessence and a Preferred Direction in the Sky Tachyonic Quintessence and a Preferred Direction in the Sky

2010-02-02

arxiv.org/abs/1002.0510v2

Phys.Rev.D81:083532,2010

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

v1- 6 pages, 1 figure; v2- version published on PRD

Scientific paper

10.1103/PhysRevD.81.083532

We show that quintessence, when it is described by a tachyonic field, can amplify a tiny primordial gradient generating a preferred direction in the sky. In its simplest realization, this mechanism only affects the Cosmic Microwave Background fluctuations at the quadrupole level. We briefly discuss how higher multipoles can also be affected, once the full structure of the quintessence potential is taken into account.

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