* Posts by E2

13 posts • joined 23 Oct 2015

UK's climate change dept abolished, but 'smart meters and all our policies strong as ever'

E2

.... and

.. they have everything to do with " demand management"

What will laws on self-driving cars look like? Think black boxes and 'minimum attention'

E2

Re: Road Net

That already has a name. MaaS.

E2

drivers ... able to immediately take control of the wheel

What does "immediately" mean ? The number I've heard mentioned is within 4 seconds. Which is quite short to asess all of the external conditions from scratch. So, sort of ebgs the question as to why have the AV ?

...ensure that in the inevitable future car crashes that will take place with these vehicles, it can be shown, clearly and legally, not to have been the fault of the software....

An invalid presumption that it will never be the fault of the sofware ( or, more accurately, the system )

Stephen Hawking reckons he's cracked the black hole paradox

E2

Re: information conservation

If we don't know the quantum physics behind this well-known thermodynamic process

We do. Quantum statistical thermodynamics is a very well established field. It's what gives you Boe-Einstein condensation, the Chandrasakar limit etc. It doesn't violate determinism.

Heisenberg's uncertainty principle should have led us to question the general validity of determinism in any case.

No. HUP doesn't violate determinism. A least not per-se. Maybe worth pointing out that detirminism in the quantum sense is the uniqueness of the time evolution of the state vector (which is what completely describes the system), not of classical variables.

E2

Re: Would you like another dimension with that, sir!

My take on this, FWIW. In the simplest, non-QM, view of black holes, they are violating determinism. The matter collapses to a singularity, which can't have structure, so history is lost, just the parameters set by physical conservation laws - mass-energy, charge, angular momentum etc. being retained. Physically, we don't expect a singularity, as QM will kick in. So, at this level, the "black-hole paradox" is a bit hype-ish. Physical theory breaks down at the limit where you expect it to break down at. Challenge for the Hawkings of this world is to introduce QM in ways that recover the features we expect in a consistent theory.

E2

Re: @h4rm0ny

"How that does that make the outcome of the collision that preceded particle Y going into the black hole non-deterministic?"

It makes the dynamics of the coupled X,Y and black-hole system non-D, at least under any time reversal symmetric dynamics.

E2

Re: Would you like another dimension with that, sir!

Once you start talking QM and GR together, it's above my degree grade as well ( Unification of these 2 is one of, if not the, unresolved issues in physics ).

As normally presented, QM is a touch internally inconsistent. One the one hand, the microscopic systems' dynamics when isolated are deterministic. Coupled microscopic systems are also detirministic. But when mixed states are forced by measurement ( executed by classical, macroscopic apparatus ) to chose between eigenstates, the wavefunction collapse - Dirac jump - is acausal. I.e. non-detirministic. This fundamental acausality ( no hidden variables ) is experimentally supported using Bell's theorem.

Problem is, the classical aperatus, experimental observer, etc. are made up of coupled atoms and molecules, etc. Analysed from this angle, how, where, and when do their consituent coupled deterministic systems suddenly and mysteriously exibit acausality ?

There is some interesting stuff on " thermodynamically irreversable quantum decoherence" which addresses this. But whether fully or just partially, I'm not up to knowing. Unfortunately (IMO) it hasn't made it into the non-specialist narrative.

E2

Re: information conservation

The observed reality of a prefered time direction is a statistical thermodyamic (entropy) effect. It doesn't conflict with the maths of time reversal symmetry on the micoscopic level.

E2

Re: information conservation

A theory is deterministic if, given the (full specification of) the state of any isolated system at a specified time, then the equations of motion (or equivalent) have one and only one solution at a future specified time.

This is the same as saying that all of the information on future (and past) states of the system is encoded in the state of the system at a specific instance.

Loss of information would destroy the 1-to-1 deteriministic mapping.

E2

Re: information conservation

PS. Underlying equations are usually time-reversal symetric, so inconsistent with 1-way deteriminism.

EU's Paris terror response includes 'virtual currencies' crimp

E2

Re: Re:Congratulations to our fore-sighted government for preventing such a risk in Britain.

Very probably co-incidence. But the systems being put in place for the future will allow this, and it'd be silly to think that they will not be used.

E2

Re: Roads....

They intend doing this. What do you think thegovernment' interest in automated cars, MaaS, etc. is.

Chaos at TalkTalk: Data was 'secure', not all encrypted, we took site down, were DDoSed

E2

Re: TalkTalk are completely incompetent

Registered specifically to endorse your statement.

Hassled several times a day from some arseholes in the Philipines who did not even have reference to the UK credit control converations that had the process on hold while they verifies that Idid not owe money.

Statements from TT in the post threatening action had no registered company name and adresss, onlt the tradign name that I traced on the web. Companies House sadi I could report it to "technical offenses" - they should be chopping the legs off major companies deliberately doing this so that you have to go through their offshore call centres.

Strangely the only decent people in the process were the debt recovery agency.

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