On Aug 3, 2015, at 5:07 PM, JACK SARFATTI <This email address is being protected from spambots. You need JavaScript enabled to view it.> wrote:
My comment on that web page
I agree with Martin Rees that the universe as a simulation is a flaky yet fascinating idea. It's a crazy idea. Is it crazy enough to be true? Let's play with it. We know that the piece of the universe we can observe with light is bounded by two classically 2D spherical shells of light called the past particle horizon and the future (de Sitter) event horizon. We are at the centers of these horizons - they are observer dependent. Our past particle horizon is the future light cone of the point of inflation creation of our "observable universe" patch. Our future event horizon is the past light cone of our "end time." This is Roger Penrose's "conformal time" in which the finite conformal end time is really infinite "wristwatch" proper time. See Roger's book "The Road to Reality" for details. What matters are the intersections of our here-now past light cone with our past particle horizon and our future light cone with our future event horizons. These two intersections are the areas A of the of the two spherical shells of light. Stephen Hawking et-al showed that these horizon areas are thermodynamic entropies S = kBA/4Lp^2, where kB is something like the quantum of entropy, Lp is the quantum of length roughly speaking, it is ~ 10^-33 cm. Seth Lloyd at MIT suggests that each pixel Lp^2 is a QUBIT of a hologram screen computer. Our future horizon has about 10^123 of these qubits. Curiously enough if we use an old idea of Wheeler and Feynman combined with Hawking's idea of black body radiation emitted not only from black hole horizons, but also from these cosmological horizons then it turns out that the back-from-future advanced Wheeler-Feynman Hawking black body radiation has two components with a low temperature Tcold = hc/kBA^1'2 and a hotter temperature from the Heisenberg uncertainty fluctuation in radial position of the horizons of Thot = hc/kB(LpA^1/2)^1/2. Planck's 1900 black body law gives an energy density hc/Lp^2A from the "hot" component. This is exactly what we see in the dark energy accelerating the expansion rate of our universe. However, in order for this crazy idea to work we have to assume that this positive energy density propagating backwards in time because that causes the required repulsive anti-gravity cosmic field that we actually see in the positive cosmological constant /\ = 1/LpA^1/2 > 0.
