The semantic desktop at work

Observer-dependent entanglement

“…|0 f is the positive frequency Wightman function (WF), and the fieldφ(x) is given by the integral over all momentum of the rightmost term in large parentheses in (13). In the above, the response function F (ω) is a consequence of Fermi's golden rule and depends only on the field and not on the structure of the detector, since the latter has been completely factored out [30].…”

“…The coordinates transformation t(τ, ζ) = (a −1 + ζ) sinh(aτ ) and x(τ, ζ) = (a −1 + ζ) cosh(aτ ) with metric ds 2 = (1 + aζ) 2 dτ 2 − dζ 2 , describes the observer's "local laboratory" where the detector sits at the origin ζ = 0 of the local spatial coordinates. For a "rigid" detector, its monopole field M(x(τ, ζ)) (the term in leftmost parentheses in (13) can be written in a factorized form M(x(τ, ζ)) = λ(τ ) M(τ ) f (ζ). The detector-field interaction is now given by…”

“…We also learned that the spatial degrees of freedom of global fields are entangled, including the vacuum state [7,8,9,10]. This entanglement can be extracted by point-like systems and in principal be used for quantum information processing (see for example [11,12,13,14]). Most of the early studies on relativistic entanglement in non-inertial frames involved global modes.…”

Universality and thermalization in the Unruh effect

“…We will introduce the non-perturbative oscillatordetector model. Replacing the usual two-level system in the Unruh-DeWitt model with a harmonic oscillator is somewhat common in the literature [3,[23][24][25][26][27]. However, in almost all of these cases, a perturbative approach was used, and not many practical non-perturbative results have been obtained in the past.…”

When the Social Meets the Semantic: Social Semantic Web or Web 2.5

“…Nevertheless, like a wiki, the query concepts are inconsistent and it is necessary to unify them. Semantic desktops [46,47] are the solution provided in order to allow semantic queries within the computer documents.…”