What-if inflaton is a spinor condensate?

Details What-if inflaton is a spinor condensate? What-if inflaton is a spinor condensate?

2009-05-15

arxiv.org/abs/0905.2573v3

Int. J. Mod. Phys. D Vol: 18, 14, 2173-2179 (2009)

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

8 Pages, This essay received an honorable mention from the Gravity Research Foundation essay competition in 2009; Typos correc

Scientific paper

10.1142/S0218271809016181

In the usual cosmological inflationary scenarios, the scalar field -- inflaton -- is usually assumed to be an elementary field. In this essay, we ask: What are the observational signatures, if the scalar field is a spinor condensate? and Is there a way to distinguish between the canonical scalar field and the spinor condensate driven models? In the homogeneous and isotropic background, we show that, although the dark-spinor (Elko) condensate leads to the identical acceleration equation as that of the canonical scalar field driven inflation, the dynamics of the two models are different. In the slow-roll limit, we show that the model, predicts a running of scalar spectral index consistent with the WMAP data. We show that the consistency relations between the spinor condensate and canonical scalar field driven model are different which can be tested using the future CMB and gravitational wave missions.

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