On Apr 12, 2013, at 12:22 AM, Ruth Kastner <
I agree that 'no mysticism' need be involved in explaining results of measurements, and that (to put it charitably) Wheeler's contributions to physics were far greater than his contributions to philosophy of physics.
I address these foundational matters in my new book on PTI. Bohm's theory may seem to provide a handy way to solve the measurement problem, however it encounters some serious challenges at the relativistic level. It has also been argued by Harvey Brown and David Wallace (2005) that even at the nonrelativistic level there are problems with the idea that a Bohmian corpuscle can give you a measurement result (ref. on request).
please send reference
On the other hand TI (extended in terms of PTI) finds its strongest expression at the relativistic level, in that one has to take absorption into account in the relativistic domain in any case, and absorption is the key overlooked aspect according to TI. In fact I argue that the measurement problem remains unsolved in the competing 'mainstream' nonrelativistic interpretations because they neglect the creation and annihilation of quanta. Emission is action by creation operators, and absorption is action by annihilation operators. You can get a definitive end to the measurement process by taking absorption (aka annihilation) into account. This happens way before the macroscopic level (see http://arxiv.org/abs/1204.5227, section 5) so that you don't get the usual infinite regress of entanglement of macroscopic objects which is the measurement problem.
I agree about the importance of including both creation and destruction in a time loop, but I don't see off-hand that is a problem for Bohm's theory.
Indeed, in my debate with Jim Woodward on dark energy density hc/Lp^2A as redshifted advanced Wheeler-Feynman Hawking radiation from our detector dependent future de Sitter horizon where the Hawking radiation density is hc/Lp^4 - the TI loop in time means that we must use the static LNIF representation of the metric for the virtual electron-positron pairs stuck at r = A^1/2 - Lp relative to the detector at r = 0 where
gtt = 1 - r^2/A
giving 1 + zstaticLNIF ~ (A^1/2/Lp)^1/2 = femit/fdetect
not the usual FRW metric where gtt = 1 and there is no horizon - that works for co-moving absorbers that will see the effect of expanding space for retarded radiation from us & 1 + zcomovingLIF = anow/athen
The static LNIF redshift factor for advanced radiation source frequency c/Lp from the future horizon back to our past detector is ~ (Lp/A^1/2)^1/2.
Even for retarded black body radiation reaching us from a past black hole horizon with Hawking's original redshifted peak frequency c/A^1/2, there should be a second peak signal at c/(LpA^1/2)^1/2 from radial oscillations of the horizon. Hawking's signal is from surface mode vibrations of the horizon.