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Infra-red effects of Non-linear sigma model in de Sitter space · Around

2011

Infra-red effects of Non-linear sigma model in de Sitter space

Kitamoto, Hiroyuki, Kitazawa, Yoshihisa

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We extend our investigation on a possible de Sitter symmetry breaking mechanism in non-linear sigma models.

The scale invariance of the quantum fluctuations could make the cosmological constant time dependent signaling the de Sitter symmetry breaking.
To understand such a symmetry breaking mechanism, we investigate the energy-momentum tensor.
We show that the leading infra-red logarithms cancel to all orders in perturbation theory in a generic non-linear sigma model.

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