Virginia Techde Boer, J.Jejjala, V.Minic, Djordje2013-12-182013-12-182005-02de Boer, J ; Jejjala, V ; Minic, D, FEB 2005. “α-states in de Sitter space,” PHYSICAL REVIEW D 71(4): 044013. DOI: 10.1103/PhysRevD.71.0440130556-2821http://hdl.handle.net/10919/24743Field theory in de Sitter space admits a one-parameter family of vacua determined by a superselection parameter alpha. Of these vacua, the Euclidean vacuum uniquely extrapolates to the vacuum of flat Minkowski space. States which resemble the alpha-vacua can be constructed as excitations above the Euclidean vacuum. Such states have modes alpha(k) which decay faster that k((1-d)/2). Fields in such states exhibit nonlocal correlations when examined from the perspective of fields in the Euclidean vacuum. The dynamics of such entangled states are fully consistent. If an alpha-state with properties that interpolate between an alpha-vacuum and the Euclidean vacuum were the initial condition for inflation, a signature for this may be found in a momentum dependent correction to the inflationary power spectrum. The functional formalism, which provides the tool for examining physics in an alpha-state, extends to fields of other spin. In particular, the extension to spin-2 may proffer a new class of infrared modifications to gravitational interactions. The implications of superselection sectors for the landscape of string vacua are briefly discussed.en-USIn Copyrightquantum-field-theorylinear dissipative systemprobe wmapobservationscosmological constantparticle creationdesitteruniverse2-point functionsmachs principlecp conservationvacuumAstronomy & AstrophysicsPhysicsArticle - Refereedhttp://link.aps.org/doi/10.1103/PhysRevD.71.044013https://doi.org/10.1103/PhysRevD.71.044013