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Physical meaning and consequences of the loop infrared divergences in global de Sitter space

E. T. Akhmedov

  • Institute for Theoretical and Experimental Physics, B. Cheremushkinskaya 25, 117218 Moscow, Russia; Moscow Institute of Physics and Technology, Institutskii per 9, 141700 Dolgoprudny, Russia; and Mathematical Faculty of the National Research University Higher School of Economics, Vavilova 7, 117312 Moscow, Russia

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Phys. Rev. D 87, 044049 – Published 22 February, 2013

DOI: https://doi.org/10.1103/PhysRevD.87.044049

Abstract

Following Krotov and Polyakov [Nucl. Phys. B849, 410 (2011)], we show that in global de Sitter space its isometry is broken by the loop IR divergences for any invariant vacuum state of the massive scalars. We derive a kinetic equation in global de Sitter space that follows from the Dyson-Schwinger equation of the Schwinger-Keldysh diagrammatic technique in the IR limit and allows us to understand the physical meaning and consequences of the loop IR divergences. In many respects, the isometry breaking in global de Sitter space is similar to the one in the contracting Poincaré patch of de Sitter space. Hence, as a warm-up exercise we study the kinetic equation and properties of its solutions in the expanding and contracting Poincaré patches of de Sitter space. Quite unexpectedly, we find that under some initial conditions there is an explosive production of massive particles in the expanding Poincaré patch.

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Outline

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Phys. Rev. D 87, 044049– Published 22 February, 2013
  • Received 21 September 2012

© 2013 American Physical Society

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