English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

States of Low Energy (SLE) are exact Hadamard states defined on arbitraryFriedmann-Lema\^{i}tre spacetimes. They are constructed from a fiducial stateby minimizing the Hamiltonian's expectation value after averaging with atemporal window function. We show the SLE to be expressible solely in terms ofthe (state independent) commutator function. They also admit a convergentseries expansion in powers of the spatial momentum, both for massive and formassless theories. In the massless case the leading infrared behavior is foundto be Minkowski-like for all scale factors. This provides a new cure for theinfrared divergences in Friedmann-Lema\^{i}tre spacetimes with acceleratedexpansion. In consequence, massless SLE are viable candidates forpre-inflationary vacua and in a soluble model are shown to entail aqualitatively correct primordial power spectrum.

Bonus Properties of States of Low Energy