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Physics Stack Exchange users whose comments are worth studying include Lubos Motl and Ron Maimon (now at http://www.quora.com/Ron-Maimon and http://www.physicsoverflow.org/user/Ron+Maimon). Also see http://arxiv.org/abs/hep-ph/0207124 for a review of physics since the standard model.


Sep
5
comment Is it possible that QM is just GR?
@user1247: I don't have a proof that Hadley's idea (I guess it is to get QM from probability distributions over space-times with micro-CTCs) can't work. All I can point out is that he doesn't have a single concrete example of such a space-time to work with... On the other hand, McCorkle's conclusion is so unlikely that it's just unbelievable, but the line of argument is too intricate to want to engage. I would point to fermionic statistics as something that he especially shouldn't be able to construct... If I come up with anything better to say, I'll post it.
Sep
5
comment top quark and Z,W bosons?
@Matt Reece: "Just a coincidence." Someone disagrees: arxiv.org/abs/1209.0474 ... In the longer run (which may not be so far away), I expect to find that there are quite a few similarly simple quantitative relations which do have explanations, but which have been dismissed as "coincidence". The difficulty is to identify which such relations do mean something, and which ones don't.
Sep
4
comment Is it possible that QM is just GR?
Mark Hadley wants to get QM from CTCs in GR, e.g. arxiv.org/abs/gr-qc/0703150. And R.A. McCorkle tried to get the whole standard model from vacuum GR, adsabs.harvard.edu/abs/1989PhyS...40..721M arxiv.org/abs/hep-th/9612045. You might find those interesting to puzzle over; try to figure out why they don't work.
Aug
28
comment Can superdeterminism resolve contextuality, entanglement and Shor's algorithm in quantum mechanics?
When a discussion gets as long as this, this website starts automatically prompting you to "move to chat". I clicked on "yes", and that last message was automatically generated... The link leads to a chat area created for continuation of this discussion. To post there, you have to have an account on "stackexchange.com", which is distinct from "physics.stackexchange.com", though you may be able to import your account details from this site.
Aug
28
comment Seeking an account of fundamental particle physics sensitive to the issue of theory-laden observation
Then I recommend the two books I already mentioned.
Aug
28
comment Can you count “collapses”? How many collapses in the observable universe?
Read "collapse" as "decoherence event" and this is a meaningful but difficult question - difficult because decoherence is a matter of degree, so one would need to talk about thresholds and other technical details.
Aug
27
comment Can superdeterminism resolve contextuality, entanglement and Shor's algorithm in quantum mechanics?
let us continue this discussion in chat
Aug
27
comment Can superdeterminism resolve contextuality, entanglement and Shor's algorithm in quantum mechanics?
Regarding your constructions: my expectation is that Bell's theorem is irrelevant for free bosonic fields because the physics isn't rich enough to make a measuring device. I'm not sure about the string, but if you can realize a Bell scenario there, I think it would have to be in a space obtained by a nonlocal transformation (holographic, twistorial, ...?) of the target space. It shouldn't be possible to produce Bell violations directly in the target space, for the usual reasons.
Aug
27
comment Can superdeterminism resolve contextuality, entanglement and Shor's algorithm in quantum mechanics?
We can make the choice of settings depend on a deterministically chaotic process. This chaotic intermediate process necessarily randomizes any "signal" that existed in the local microscopic physical state. So the only way to get the right statistics in the experimental outcomes will be to have exponential finetuning of the initial conditions.
Aug
27
comment Can superdeterminism resolve contextuality, entanglement and Shor's algorithm in quantum mechanics?
You have to show how the altered past could possibly produce the right chances without miraculous finetuning, when the right chances depend on the experimental settings, and the experimental settings depend on weight of mouse droppings, or number of lightning strikes modulo 2, or the nth digit of pi, or any other input that could be used to govern a control process...
Aug
27
comment Seeking an account of fundamental particle physics sensitive to the issue of theory-laden observation
You need to suppose that everything is made of atoms, and that there are physical laws, and that 2+2=4... The SM is very thoroughly tested by now. If it's wrong, it's wrong at the margins. If physical reality works in some completely other way, that other way must still mimic the SM very closely, in all circumstances presently accessible to experiment. The hegemony of the SM is not due to paradigm blindness, it's due to repeated quantitative success.
Aug
26
comment Seeking an account of fundamental particle physics sensitive to the issue of theory-laden observation
This really all depends on the level at which you hope to see blindspots and paradigm-busting. What paradigm do you want to challenge - neutralino dark matter? the continuum? the 5-sigma standard of evidence? The literature of physics provides a constant stream of attempts at re-thinking and new thinking, at every level that anyone has imagined. Arxiv is full of this; and for anyone who wants to revert to earlier stages of physics and start over, we have vixra.
Aug
25
comment Seeking an account of fundamental particle physics sensitive to the issue of theory-laden observation
David, theory-laden observation is a commonplace notion of physics, but it seems you want to hear about something very abstract and general, rather than about episodes like how they confused muon and pion. For the latter, a good history like Abraham Pais's "Inward Bound" should provide endless raw material. For the former... there is a famous book called "Constructing Quarks", but I've never read it.
Aug
24
comment Can superdeterminism resolve contextuality, entanglement and Shor's algorithm in quantum mechanics?
Each location only has a local copy of the vacuum data, but to produce the correlations, the apparatus at each location would also need to "know about" the settings of the apparatus at the other location, which aren't determined by the vacuum data, they're determined by the macroscopic control processes.
Aug
24
comment Can superdeterminism resolve contextuality, entanglement and Shor's algorithm in quantum mechanics?
I never said the photons are unaffected by the past. The problem is that the experimental settings can be controlled by arbitrarily complicated macroscopic processes. When this happens at two or more locations which are spacelike separated, there is no way for a shared subquantum vacuum to be the common cause behind Bell correlations...
Aug
24
comment Can superdeterminism resolve contextuality, entanglement and Shor's algorithm in quantum mechanics?
You don't have to think in terms of counterfactuals. You can have many instances of the same experiment (but with varied settings) taking place in the same space-time. The implication of Bell's theorem is that you can't get the right frequencies for the outcomes from a local deterministic physics, unless you artificially tune the microscopic causes at each separate location in order to give the desired frequencies.
Aug
23
comment Can superdeterminism resolve contextuality, entanglement and Shor's algorithm in quantum mechanics?
so you can't get the right statistics just by relying on the subquantum vacuum being the same everywhere.
Aug
23
comment Can superdeterminism resolve contextuality, entanglement and Shor's algorithm in quantum mechanics?
The distant past is a causal antecedent of both the experimental settings and the EPR pair. But for the experimental settings, the local chain of cause and effect "passes through" the mouse, whereas it does not do so for the EPR pair. The scenario is that the selection of experimental setting is determined by what happens inside the mouse, a complicated macroscopic process...
Aug
22
comment What criteria distinguishes causality from retrocausality?
One reason that this is annoying is that you actually have something to say, but since it is scattered across a dozen identities, it's not possible to see how your thoughts connect.
Aug
22
comment What criteria distinguishes causality from retrocausality?
And "Naive stupid boy" who posted 10 minutes later. physics.stackexchange.com/q/34713/1486