Squeezed States in the de Sitter Vacuum

Abstract

We discuss the treatment of squeezed states as excitations in the Euclidean vacuum of de Sitter space. A comparison with the treatment of these states as candidate no-particle states, or alpha-vacua, shows important differences already in the free theory. At the interacting level alpha-vacua are inconsistent, but squeezed state excitations seem perfectly acceptable. Indeed, matrix elements can be renormalized in the excited states using precisely the standard local counterterms of the Euclidean vacuum. Implications for inflationary scenarios in cosmology are discussed.

15 pages, no figures. One new citation in version 3; no other changes

References in corpus (3)

• A note on alpha-vacua and interacting field theory in de Sitter space
• Trans-Planckian footprints in inflationary cosmology
• Vacuum Choices and the Predictions of Inflation

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