Re: Reachability for infinite -time Turing machines with long tapes

--Original Message- > From: Lawrence Crowell > > To: Everything List > > Sent: Wed, Mar 11, 2020 10:31 am > Subject: Re: Reachability for infinite -time Turing machines with long > tapes > > On Tuesday, March 10, 2020 at 10:16:38 AM UTC-5, Philip Thrift wrote: &

Re: Reachability for infinite -time Turing machines with long tapes

putability are *useless* to science. Suppose we found some actual matter that does infinite-time computing https://arxiv.org/abs/math/9808093 We extend in a natural way the operation of Turing machines to infinite ordinal time, and investigate the resulting supertask theory of com

Re: Reachability for infinite -time Turing machines with long tapes

You're ignoring quantum and photonic computing??!!  -Original Message- From: Lawrence Crowell To: Everything List Sent: Wed, Mar 11, 2020 10:31 am Subject: Re: Reachability for infinite -time Turing machines with long tapes On Tuesday, March 10, 2020 at 10:16:38 AM UTC-5, Philip

Re: Reachability for infinite -time Turing machines with long tapes

On Tuesday, March 10, 2020 at 10:16:38 AM UTC-5, Philip Thrift wrote: > > > https://arxiv.org/abs/1802.05734 > > @philipthrift > It looks to be a version of the busy beaver problem. The scale of the problem grows beyond computable bounds. LC -- You received this message because you are

Reachability for infinite -time Turing machines with long tapes

https://arxiv.org/abs/1802.05734 @philipthrift -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To view this

Re: Time Machines

rves in the spacetimes. The whole >> cosmology has a net angular momentum that frame drags geodesics into closed >> timelike curves.* >> > > So you could make a Time Machine if Gödel's solution to Einstein's field > equations was relevant for our universe, but it's not becaus

Re: Time Machines

or down on Godel, this'll take a while -Original Message- From: John Clark To: everything-list Sent: Fri, Jan 10, 2020 12:31 pm Subject: Time Machines On Wed, Jan 8, 2020 at 5:56 AM Lawrence Crowell wrote:   > Gödel's cosmology violates the Hawking-Penrose condition T^{00} &

Time Machines

r momentum that frame drags geodesics into closed > timelike curves.* > So you could make a Time Machine if Gödel's solution to Einstein's field equations was relevant for our universe, but it's not because the universe we live in doesn't spin. John K Clark -- You received this message

Carlton Frederick: Crypto-Stochastic Space-Time

, and theoretical physics at that. Almost as an epiphany, I realized that the time had come; I should be working on physics again. I had the time and freedom. And if I didn't resume research then, I probably never would.”* *Frederick took up physics again. He allocated five months where he devoted

Re: An inexpensive crystal makes a fine quantum time machine

This is actually quite interesting. The OTO measurements indicating entanglement increase means there is an evolution towards nonlocality. It should be mentioned that QFT with equal time commutators and Wightman conditions do not consider this. This seems to point to how there can be a duality

An inexpensive crystal makes a fine quantum time machine

radoxical about the idea of making a later measurement first and an earlier measurement second. One need only write down a factor of e^iHt/ℏ in between their two operators, where H is the system’s Hamiltonian, to represent the rewinding of time. (Forward-propagating time, in contrast, is represe

My new paper "The Quale of Time" published on MDPI Philosophies

My new paper "The Quale of Time" has been published on MDPI Philosophies: https://www.mdpi.com/2409-9287/4/2/16 <https://www.google.com/url?q=https%3A%2F%2Fwww.mdpi.com%2F2409-9287%2F4%2F2%2F16=D=1=AFQjCNHu83STOUIkFIaE7ygEmZfkAl3wWw> The paper is based on my ideas about emergen

Re: The Arrow of Time

> >>> From: <agrays...@gmail.com> >>> >>> >>> Question for Bruce; >>> >>> Remember when you tried to establish an arrow of time at the quantum >>> level with a paper on bremsstrahlung? Eventually, you withdrew that >>

Re: Gödel and the unreality of time

m not sure if the Gödel universe can do this. Generally this is regarded > as a pathological spacetime, one that is maybe removed by a superselection of > states in quantum gravitation. > > I am not sure this means time does not exist. It would mean in a way that > time has no global

Re: Gödel and the unreality of time

edges can generate entire cosmologies. I am not sure if the Gödel universe can do this. Generally this is regarded as a pathological spacetime, one that is maybe removed by a superselection of states in quantum gravitation. I am not sure this means time does not exist. It would mean in a way that

Re: The Arrow of Time

On Sunday, May 13, 2018 at 5:19:04 AM UTC, Bruce wrote: > > From: <agrays...@gmail.com > > > > On Saturday, May 12, 2018 at 10:36:54 PM UTC, Bruce wrote: >> >> From: <agrays...@gmail.com> >> >> >> Question for Bruce; >> >>

Gödel and the unreality of time

https://edwardfeser.blogspot.fr/2018/05/godel-and-unreality-of-time.html -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to

Re: The Arrow of Time

On Sunday, May 13, 2018 at 5:19:04 AM UTC, Bruce wrote: > > From: <agrays...@gmail.com > > > > On Saturday, May 12, 2018 at 10:36:54 PM UTC, Bruce wrote: >> >> From: <agrays...@gmail.com> >> >> >> Question for Bruce; >> >>

Re: The Arrow of Time

From: <agrayson2...@gmail.com <mailto:agrayson2...@gmail.com>> On Saturday, May 12, 2018 at 10:36:54 PM UTC, Bruce wrote: From: <agrays...@gmail.com> Question for Bruce; Remember when you tried to establish an arrow of time at the quantum level with a paper

Re: The Arrow of Time

On Saturday, May 12, 2018 at 10:36:54 PM UTC, Bruce wrote: > > From: <agrays...@gmail.com > > > > Question for Bruce; > > Remember when you tried to establish an arrow of time at the quantum level > with a paper on bremsstrahlung? Eventually, you withdrew that a

Re: The Arrow of Time

From: <agrayson2...@gmail.com <mailto:agrayson2...@gmail.com>> Question for Bruce; Remember when you tried to establish an arrow of time at the quantum level with a paper on bremsstrahlung? Eventually, you withdrew that analysis. But if you believe quantum measurements are

Re: The Arrow of Time

Question for Bruce; Remember when you tried to establish an arrow of time at the quantum level with a paper on bremsstrahlung? Eventually, you withdrew that analysis. But if you believe quantum measurements are irreversible in principle, isn't that sufficient to establish an arrow of time

Re: time arrow, measurement, superposition

> >> In 50% of the cases, it will turn out alive. >> >> I did not say this is impossible, but only that I don’t know how to >> construct the ψ-measuring machine. >> >> >> Is the "I" you or Ashe? I don't really follow this. If you have time

Re: time arrow, measurement, superposition

m the projection operator on >> state ψ. >> >> In 50% of the cases, the state of the cat will become ψ. >> >> Now measure whether the resulting cat in state ψ is alive or dead. >> >> In 50% of the cases, it will turn out alive. >> >> I did not

Re: time arrow, measurement, superposition

te of the cat will become ψ. >> >> Now measure whether the resulting cat in state ψ is alive or dead. >> >> In 50% of the cases, it will turn out alive. >> >> I did not say this is impossible, but only that I don’t know how to >> construct the ψ-measu

On the reversal of time in natural law (Schroedinger)

Schroedinger wrote an interesting (little known) paper, in 1931. It is a sort of 'Two-time symmetric interpretation' or 'Two-state vector quantum formalism', I mean that 'ABL rule', that Aharonov's stuff. “Über die Umkehrung der Naturgesetze,” Sitz. preuss. Akad. Wiss., Phys.-Math. Klasse 9

Re: The Arrow of Time

by time reversal. AG I argued this conclusion on the Entanglement thread. Here I will add some additional considerations. When you think of time reversibility, say for an electron being measured by SG device, you naturally think of passing the measured electron

Re: The Arrow of Time

;> >> >> >> On Monday, April 30, 2018 at 3:33:23 AM UTC, agrays...@gmail.com wrote: >>> >>> Implied by standard QM insofar as the theory is inherently irreversible, >>> that is, irreversible in principle at the quantum level since the wf cannot >&g

Re: The Arrow of Time

as the theory is inherently irreversible, that is, irreversible in principle at the quantum level since the wf cannot be recovered by time reversal. AG I argued this conclusion on the Entanglement thread. Here I will add some additional considerations. When you think

Re: The Arrow of Time

he theory is inherently irreversible, >> that is, irreversible in principle at the quantum level since the wf cannot >> be recovered by time reversal. AG >> > > I argued this conclusion on the Entanglement thread. Here I will add some > additional considerations. When you think of time re

Re: The Arrow of Time

be recovered by time reversal. AG I argued this conclusion on the Entanglement thread. Here I will add some additional considerations. When you think of time reversibility, say for an electron being measured by SG device, you naturally think of passing the measured electron backward along the same

Re: time arrow, measurement, superposition

know how to > construct the ψ-measuring machine. > Is the "I" you or Ashe? I don't really follow this. If you have time, you can expound a bit on what he's trying to say. AG -- You received this message because you are subscribed to the Google Groups "Everything List&qu

time arrow, measurement, superposition

Here below a point made by Asher Peres. -- One can even think of an experiment exhibiting the interference pattern between the cat alive and the cat dead. If such an experiment could indeed be performed, then the phase θ in the state ψ = 2-1/2[ |live> + exp(iθ)|dead>] would be

Re: The Arrow of Time

F > CORRECTION TO PREVIOUS STATEMENT: > I conflated time reversibility with time symmetry. So ignore comments > about the latter. AG > 2ND CORRECTION TO PREVIOUS STATEMENT: I don't think I correctly described the time revered process. It does NOT simply involve taking the backward

Re: The Arrow of Time

principle at the quantum level since the wf cannot >> be recovered by time reversal. AG >> > > I argued this conclusion on the Entanglement thread. Here I will add some > additional considerations. When you think of time reversibility, say for an > electron being

Re: The Arrow of Time

On Monday, April 30, 2018 at 3:33:23 AM UTC, agrays...@gmail.com wrote: > > Implied by standard QM insofar as the theory is inherently irreversible, > that is, irreversible in principle at the quantum level since the wf cannot > be recovered by time reversal. AG > I argued

The Arrow of Time

Implied by standard QM insofar as the theory is inherently irreversible, that is, irreversible in principle at the quantum level since the wf cannot be recovered by time reversal. AG -- You received this message because you are subscribed to the Google Groups "Everything List&q

Re: Page time and quantum error correction codes

looked at this. I got more response from a > post I sent to this list by accident. > > LC > > On Saturday, December 23, 2017 at 7:17:13 PM UTC-6, Lawrence Crowell > wrote: >> >> I answered an outstanding question on the physics stack exchange on page >> time

Re: Page time and quantum error correction codes

ody looked at this. I got more response from a post I sent to this list by accident. LC On Saturday, December 23, 2017 at 7:17:13 PM UTC-6, Lawrence Crowell wrote: I answered an outstanding question on the physics stack exchange on page time and information scrambling

Re: Page time and quantum error correction codes

I am curious whether anybody looked at this. I got more response from a post I sent to this list by accident. LC On Saturday, December 23, 2017 at 7:17:13 PM UTC-6, Lawrence Crowell wrote: > > I answered an outstanding question on the physics stack exchange on page > time and in

Page time and quantum error correction codes

I answered an outstanding question on the physics stack exchange on page time and information scrambling <https://physics.stackexchange.com/questions/368492/page-time-and-black-hole-scrambling-of-information>. Below are the first three paragraphs of the answer. The Page time comes

Re: "We spent a long time trying to convince ourselves this wasn’t real"

On Tue, Aug 9, 2016 at 9:17 AM, Telmo Menezes wrote: ​> ​ > Those are all good points, but it is not necessary that the Dyson > ​ ​ > builders are native of the star where they are building a certain > ​ ​ > sphere, right? > ​Maybe, but if interstellar travel was common

Re: "We spent a long time trying to convince ourselves this wasn’t real"

lve. On Earth it took > 4 billion years to go from chemicals to worms and another half a billion > years to go from worms to present day people. > The star you're talking about would only have a 1.6 billion year window for > life, and that doesn't seem like enough time > for Evolution >

Re: "We spent a long time trying to convince ourselves this wasn’t real"

u're talking about would only have a 1.6 billion year window for life, and that doesn't seem like enough time ​ for Evolution to ​ turn chemicals into Dyson ​builders​ . If you were on the Earth when the sun was ​only ​ 1.6 billion years old you'd have to wait another 2.4 billion years to see the fi

Re: "We spent a long time trying to convince ourselves this wasn’t real"

g-list <everything-list@googlegroups.com> Sent: Sun, Aug 7, 2016 5:05 pm Subject: Re: "We spent a long time trying to convince ourselves this wasn’t real" On Sun, Aug 7, 2016 at 8:45 PM, spudboy100 via Everything List <everything-list@googlegroups.com> wrote: > What I read

Re: "We spent a long time trying to convince ourselves this wasn’t real"

e existence of our galactic neighbors, as they do already with the fossil record, for example. And you? Cheers, Telmo. > > > -Original Message- > From: Telmo Menezes <te...@telmomenezes.com> > To: everything-list <everything-list@googlegroups.com> > Sent: Sun, Aug

Re: "We spent a long time trying to convince ourselves this wasn’t real"

pm Subject: "We spent a long time trying to convince ourselves this wasn’t real" What do you guys think of this? http://gizmodo.com/the-so-called-alien-megastructure-just-got-even-more-my-1784883811?utm_campaign=socialflow_io9_facebook_source=io9_facebook_medium=socialflow Cheers Telmo

"We spent a long time trying to convince ourselves this wasn’t real"

What do you guys think of this? http://gizmodo.com/the-so-called-alien-megastructure-just-got-even-more-my-1784883811?utm_campaign=socialflow_io9_facebook_source=io9_facebook_medium=socialflow Cheers Telmo. -- You received this message because you are subscribed to the Google Groups

Re: musings on time

On 03 Aug 2016, at 02:16, 'Chris de Morsella' via Everything List wrote: From: Bruno Marchal <marc...@ulb.ac.be> To: everything-list@googlegroups.com Sent: Monday, August 1, 2016 3:36 AM Subject: Re: musings on time On 29 Jul 2016, at 00:25, 'Chris de Morsella' via Everything List

Re: musings on time

From: Bruno Marchal <marc...@ulb.ac.be> To: everything-list@googlegroups.com Sent: Monday, August 1, 2016 3:36 AM Subject: Re: musings on time On 29 Jul 2016, at 00:25, 'Chris de Morsella' via Everything List wrote: From: Bruno Marchal <marc...@ulb.ac.be> To

Re: musings on time

On 29 Jul 2016, at 00:25, 'Chris de Morsella' via Everything List wrote: From: Bruno Marchal <marc...@ulb.ac.be> To: everything-list@googlegroups.com Sent: Wednesday, July 27, 2016 8:38 AM Subject: Re: musings on time On 26 Jul 2016, at 19:59, 'cdemorse...@yahoo.com' via Everything

Re: musings on time

From: Bruno Marchal <marc...@ulb.ac.be> To: everything-list@googlegroups.com Sent: Wednesday, July 27, 2016 8:38 AM Subject: Re: musings on time On 26 Jul 2016, at 19:59, 'cdemorse...@yahoo.com' via Everything List wrote:    -- Original message--From: Bruno M

Re: musings on time

from time to time, lurking I guess…. without further ado this is what I am musing on – today at least -- in the form of a poem. Time a Musing Time, this tapestry upon which the stories of the universe are written. This weave, spun from dancing kaleidoscope threads Giving us our view

Re: musings on time

   -- Original message-- From: Bruno Marchal <marc...@ulb.ac.be>Date: Mon, 7/25/2016 7:31 AM On 25 Jul 2016, at 01:45, 'Chris de Morsella' via Everything List wrote:Hey it’s been a while… been following some discussions from time to time, lurking I guess….without furth

Re: musings on time

On 25 Jul 2016, at 01:45, 'Chris de Morsella' via Everything List wrote: Hey it’s been a while… been following some discussions from time to time, lurking I guess…. without further ado this is what I am musing on – today at least -- in the form of a poem. Time a Musing Time

RE: musings on time

Hey it’s been a while… been following some discussions from time to time, lurking I guess…. without further ado this is what I am musing on – today at least -- in the form of a poem. Time a Musing Time, this tapestry upon which the stories of the universe are written. This weave

Re: Can Space-Time Be Based on Logic and Computation?

I would suspect the pessimism label for "static" expresses disappointment with scientific dogma... in other words, people become attracted to current body of knowledge and often forget that body of knowledge itself transforms wildly over time. There is a political inertia in acade

Re: Can Space-Time Be Based on Logic and Computation?

Hi Dan, On 30 Mar 2016, at 07:26, Dan wrote: Bruno, I always anticipate your thoughtful replies. I seem to transcend my own logical capabilities each time you introduce some concept which, at first, seems paradoxical to me. Resolution of paradox (due to language ambiguity or sensory

Re: Can Space-Time Be Based on Logic and Computation?

Bruno, I always anticipate your thoughtful replies. I seem to transcend my own logical capabilities each time you introduce some concept which, at first, seems paradoxical to me. Resolution of paradox (due to language ambiguity or sensory illusion) seems to me to be an essential growth

Re: Can Space-Time Be Based on Logic and Computation?

Bruno, I always anticipate your thoughtful replies. I seem to transcend my own logical capabilities each time you introduce some concept which, at first, seems paradoxical to me. Resolution of paradox (due to language ambiguity or sensory illusion) seems to me to be an essential growth

Re: Can Space-Time Be Based on Logic and Computation?

ing, but the second one can be used to put light on the qualia/ consciousness problem: how do we "know" non provable sentences? The constructive aspect of Gödel's incompleteness explains why the machine is confronted to such truth all the time, and how that enrich its menta

Re: Can Space-Time Be Based on Logic and Computation?

2:56:01 PM UTC-4, Bruno Marchal wrote: > > > On 24 Mar 2016, at 05:15, Dan wrote: > > Paper discussing exact mapping between renormalization group and deep > learning: http://arxiv.org/abs/1410.3831 > > > > It seems interesting, thanks. > > > > Another paper

Re: Can Space-Time Be Based on Logic and Computation?

org/abs/1410.3831 > > > > It seems interesting, thanks. > > > > Another paper relating Kolmogorov complexity to geometry, with focus on > spacetime / causality: http://arxiv.org/abs/1206.2893 > > > I will dig on this more when I have more time, but I am less convinced

Re: Can Space-Time Be Based on Logic and Computation?

://arxiv.org/abs/1206.2893 I will dig on this more when I have more time, but I am less convinced at first sight. Have you read my arguments? You would better see if some ideas there could help or not to extract physics from arithmetic through machine's self-reference. Some caution have

Re: Can Space-Time Be Based on Logic and Computation?

inutes in to Wolfram's SETI lecture. > > -Original Message- > From: Dan <eck...@gmail.com > > To: Everything List <everyth...@googlegroups.com > > Sent: Wed, Mar 16, 2016 11:13 pm > Subject: Can Space-Time Be Based on Logic and Computation? > > Pa

Re: Can Space-Time Be Based on Logic and Computation?

. -Original Message- From: Dan <eck...@gmail.com> To: Everything List <everything-list@googlegroups.com> Sent: Wed, Mar 16, 2016 11:13 pm Subject: Can Space-Time Be Based on Logic and Computation? Paper: http://arxiv.org/abs/1602.06987 Comments: Lossless compression of an image o

Can Space-Time Be Based on Logic and Computation?

Paper: http://arxiv.org/abs/1602.06987 Comments: Lossless compression of an image or audio file approximates its Kolmogorov complexity and reveals its "compressibility," or "interestingness." If it's not at all compressible it is too random to be aesthetic or enjoyable, whereas too much

Re: Can Space-Time Be Based on Logic and Computation?

g List <everything-list@googlegroups.com> Sent: Wed, Mar 16, 2016 11:13 pm Subject: Can Space-Time Be Based on Logic and Computation? Paper: http://arxiv.org/abs/1602.06987 Comments: Lossless compression of an image or audio file approximates its Kolmogorov complexity and reveals its &quo

Re: America: Bankrupt Living on Borrowed Time

-bankrupt-and-borrowed-time America-wings…. [image: Americanwings cartoon.jpg] -- You received this message because you are subscribed to the Google Groups Everything List group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr

Re: America: Bankrupt Living on Borrowed Time

of all their Property until their Children will wake up homeless on the continent their Fathers conquered.”* And so it seems sometimes the answer is right in front of us all along and we just fail to see it. http://www.zerohedge.com/news/2015-04-07/america-bankrupt-and-borrowed-time America

Re: America: Bankrupt Living on Borrowed Time

: Bankrupt Living on Borrowed Time Wow good cartoon - near the knuckle. Nice to see Mr Monopoly ... and the names on the seats aren't exactly necessary... I must save a copy of that! On 8 April 2015 at 19:52, Telmo Menezeste...@telmomenezes.com wrote: Thanks Brent

RE: America: Bankrupt Living on Borrowed Time

. -Original Message- From: spudboy100 via Everything List everything-list@googlegroups.com Sent: ‎9/‎04/‎2015 8:41 AM To: everything-list@googlegroups.com everything-list@googlegroups.com Subject: Re: America: Bankrupt Living on Borrowed Time It's already been the truth, but now with Silicon Valley

RE: America: Bankrupt Living on Borrowed Time

From: everything-list@googlegroups.com [mailto:everything-list@googlegroups.com] On Behalf Of colin hales Sent: Wednesday, April 08, 2015 4:54 PM To: everything-list@googlegroups.com Subject: RE: America: Bankrupt Living on Borrowed Time We can change things. Everything

Re: America: Bankrupt Living on Borrowed Time

their Children will wake up homeless on the continent their Fathers conquered.”* And so it seems sometimes the answer is right in front of us all along and we just fail to see it. http://www.zerohedge.com/news/2015-04-07/america-bankrupt-and-borrowed-time America-wings…. [image: Americanwings

Re: America: Bankrupt Living on Borrowed Time

will wake up homeless on the continent their Fathers conquered.”* And so it seems sometimes the answer is right in front of us all along and we just fail to see it. http://www.zerohedge.com/news/2015-04-07/america-bankrupt-and-borrowed-time America-wings…. [image: Americanwings cartoon.jpg

Re: America: Bankrupt Living on Borrowed Time

On 9 April 2015 at 11:53, colin hales col.ha...@gmail.com wrote: We can change things. Everything these predatory self-interested oligarchs have (and their soul-less, ethics-less zombie proxy humans ... corporations) only exists because we believe it exists. The zombie apocalypse is

Re: America: Bankrupt Living on Borrowed Time

will wake up homeless on the continent their Fathers conquered.”* And so it seems sometimes the answer is right in front of us all along and we just fail to see it. http://www.zerohedge.com/news/2015-04-07/america-bankrupt-and-borrowed-time America-wings…. [image: Americanwings cartoon.jpg

Re: America: Bankrupt Living on Borrowed Time

will wake up homeless on the continent their Fathers conquered.”* And so it seems sometimes the answer is right in front of us all along and we just fail to see it. http://www.zerohedge.com/news/2015-04-07/america-bankrupt-and-borrowed-time America-wings…. [image: Americanwings

Fwd: America: Bankrupt Living on Borrowed Time

homeless on the continent their Fathers conquered*.”/ And so it seems sometimes the answer is right in front of us all along and we just fail to see it. http://www.zerohedge.com/news/2015-04-07/america-bankrupt-and-borrowed-time America-wings…. Americanwings cartoon.jpg -- You received

Re: Reversing time = local reversal of thermodynamic arrows?

On 22 November 2014 05:36, John Clark johnkcl...@gmail.com wrote: On Fri, Nov 21, 2014 Bruno Marchal marc...@ulb.ac.be wrote: Yes the Schrodinger Wave Equation is easily reversible (and it's continuous and deterministic too), but with regard to the reversibility of time that's a irrelevant

Re: Reversing time = local reversal of thermodynamic arrows?

On 21 Nov 2014, at 17:36, John Clark wrote: On Fri, Nov 21, 2014 Bruno Marchal marc...@ulb.ac.be wrote: Yes the Schrodinger Wave Equation is easily reversible (and it's continuous and deterministic too), but with regard to the reversibility of time that's a irrelevant fact because

Re: Reversing time = local reversal of thermodynamic arrows?

On 21 Nov 2014, at 18:09, John Clark wrote: On Fri, Nov 21, 2014 Bruno Marchal marc...@ulb.ac.be wrote: To get something real that you can actually see I am a platonist. If I see something, I very much doubt it is real ... Then I don't know what the word real means. real is when I

Re: Reversing time = local reversal of thermodynamic arrows?

to the reversibility of time that's a irrelevant fact because the SWE is a unobservable abstraction. To be sure I was reasoning assuming the usual non relativistic SWE. Then it is reversible in the same unitary sense that quantum computer gates are reversible, which includes the usual notion

Re: Reversing time = local reversal of thermodynamic arrows?

On Sun, Nov 23, 2014 Bruno Marchal marc...@ulb.ac.be wrote: real is when I saw things, $and* I am not dreaming (say). Dreams are thoughts and thoughts exists in the same way that lines of longitude and latitude exists, on the other hand the evidence favors the theory that the sun has

Re: Reversing time = local reversal of thermodynamic arrows?

On 23 Nov 2014, at 17:24, John Clark wrote: On Sun, Nov 23, 2014 Bruno Marchal marc...@ulb.ac.be wrote: real is when I saw things, $and* I am not dreaming (say). Dreams are thoughts and thoughts exists in the same way that lines of longitude and latitude exists, on the other hand the

Re: Reversing time = local reversal of thermodynamic arrows?

in the Hilbert space. I can hardly imagine something more reversible. Yes the Schrodinger Wave Equation is easily reversible (and it's continuous and deterministic too), but with regard to the reversibility of time that's a irrelevant fact because the SWE is a unobservable abstraction. To be sure I

Re: Reversing time = local reversal of thermodynamic arrows?

On Fri, Nov 21, 2014 Bruno Marchal marc...@ulb.ac.be wrote: Yes the Schrodinger Wave Equation is easily reversible (and it's continuous and deterministic too), but with regard to the reversibility of time that's a irrelevant fact because the SWE is a unobservable abstraction. To be sure

Re: Reversing time = local reversal of thermodynamic arrows?

On Fri, Nov 21, 2014 Bruno Marchal marc...@ulb.ac.be wrote: To get something real that you can actually see I am a platonist. If I see something, I very much doubt it is real ... Then I don't know what the word real means. You get all sorts of strange stuff with i, like i^2=i^6 =-1 and

Re: Reversing time = local reversal of thermodynamic arrows?

On 19 Nov 2014, at 19:43, Richard Ruquist wrote: In MWI it is rather difficult to reverse time and unsplit the universe. The mutiverse is only the quantum configuration space taken seriously. The SWE describe all quantum evolution as a rotation (a unitary transformation) of a state

Re: Reversing time = local reversal of thermodynamic arrows?

On Thu, Nov 20, 2014 at 10:43 AM, Bruno Marchal marc...@ulb.ac.be wrote: On 19 Nov 2014, at 19:43, Richard Ruquist wrote: In MWI it is rather difficult to reverse time and unsplit the universe. The mutiverse is only the quantum configuration space taken seriously. The SWE describe all

Re: Reversing time = local reversal of thermodynamic arrows?

reversible. Yes the Schrodinger Wave Equation is easily reversible (and it's continuous and deterministic too), but with regard to the reversibility of time that's a irrelevant fact because the SWE is a unobservable abstraction. To get something real that you can actually see you must square

Re: Reversing time = local reversal of thermodynamic arrows?

On Tue, Nov 18, 2014 at 12:06 AM, Russell Standish li...@hpcoders.com.au wrote: I'd say that by about 1850 when people started to have a understanding of what Entropy was physicists had all they needed to have known that the universe must have started out in a very very low entropy state, that

Re: Reversing time = local reversal of thermodynamic arrows?

In MWI it is rather difficult to reverse time and unsplit the universe. It's not Hermitian Richard On Wed, Nov 19, 2014 at 1:40 PM, John Clark johnkcl...@gmail.com wrote: On Tue, Nov 18, 2014 at 12:06 AM, Russell Standish li...@hpcoders.com.au wrote: I'd say that by about 1850 when people

Re: Reversing time = local reversal of thermodynamic arrows?

On Wed, Nov 19, 2014 at 1:43 PM, Richard Ruquist yann...@gmail.com wrote: In MWI it is rather difficult to reverse time and unsplit the universe. Reversing time and unspliting universes are not the same thing. When a electron passes 2 slits the universe splits, when they hit the photographic

Re: Reversing time = local reversal of thermodynamic arrows?

You cannot really believe that coherency controls your life.?? On Wed, Nov 19, 2014 at 1:56 PM, John Clark johnkcl...@gmail.com wrote: On Wed, Nov 19, 2014 at 1:43 PM, Richard Ruquist yann...@gmail.com wrote: In MWI it is rather difficult to reverse time and unsplit the universe

Re: Reversing time = local reversal of thermodynamic arrows?

On 18 November 2014 18:06, Russell Standish li...@hpcoders.com.au wrote: On Fri, Nov 07, 2014 at 10:53:28PM -0500, John Clark wrote: On Thu, Nov 6, 2014 at 3:56 PM, meekerdb meeke...@verizon.net wrote: I'd say that expansion of the universe is almost necessary, not contingent.

Re: Reversing time = local reversal of thermodynamic arrows?

On Fri, Nov 07, 2014 at 12:59:28PM +1100, Bruce Kellett wrote: LizR wrote: On 7 November 2014 12:32, Bruce Kellett bhkell...@optusnet.com.au mailto:bhkell...@optusnet.com.au wrote: I have not seen your arguments for this, being new to the list, but the expansion of the universe is a

Re: Reversing time = local reversal of thermodynamic arrows?

of the plasma was almost infinitely below the maximum possible. There is no need for the maximum entropy, whatever that might be, to increase with the expansion because there is still an enormous potential for entropy to increase as gravitation comes into play. The time scale for this is much longer than

Re: Reversing time = local reversal of thermodynamic arrows?

be, to increase with the expansion because there is still an enormous potential for entropy to increase as gravitation comes into play. The time scale for this is much longer than the timescale of quark processes, so is not evident at early times. The main role that the expansion plays

Re: Reversing time = local reversal of thermodynamic arrows?

On Fri, Nov 07, 2014 at 10:53:28PM -0500, John Clark wrote: On Thu, Nov 6, 2014 at 3:56 PM, meekerdb meeke...@verizon.net wrote: I'd say that expansion of the universe is almost necessary, not contingent. I'd say that by about 1850 when people started to have a understanding of what

<    1   2   3   4   5   6   7   8   >