Charlie Stromeyer Jr.
May13-04, 06:49 AM
<jabberwocky><div class="vbmenu_control"><a href="jabberwocky:;" onClick="newWindow=window.open('','usenetCode','toolbar=no, location=no,scrollbars=yes,resizable=yes,status=no ,width=650,height=400'); newWindow.document.write('<HTML><HEAD><TITLE>Usenet ASCII</TITLE></HEAD><BODY topmargin=0 leftmargin=0 BGCOLOR=#F1F1F1><table border=0 width=625><td bgcolor=midnightblue><font color=#F1F1F1>This Usenet message\'s original ASCII form: </font></td></tr><tr><td width=449><br><br><font face=courier><UL><PRE>First, I would like to say "Hi" to Lubos and Urs and to thank them for\nbeing two of the moderators of this newsgroup.\n\nFor those of you who may not know, Lubos was the first person to\nanalytically prove Hod\'s conjecture about the quasinormal modes of\nblack holes, and later I will post about what QNMs may mean in\ndetermining whether it is even feasable for dS space to contain a\nfinite dimensional Hilbert space, i.e. unless somebody else has\nalready posted on this topic.\n\nIn the meantime, let us consider a question which may be even more\ndifficult :-)\n\nSpeaking of analytical proofs, I once tried to figure out whether\nacausal effects can arise in the non-local string theories (NLSTs)\nfirst described in [1] because I wanted to use such knowledge for\ndemonstrating the superiority of Maldacena\'s version of holography vs.\nany potential axiomatic QFT versions of holography such as those of\nRehren.\n\nHowever, before I could see an answer to the question of acausal\neffects I noticed that U. Trittman had found that Maldacena\'s\nconjecture is superior by instead using numerical simulations, and\nthen I forgot about the acausality question.\n\nNow, though, I am reminded of this issue about acausality because\nsomeone referred me to a brief four page paper which descibes a\nrelatively simple experiment showing that the wavefunction in QM is\nboth non-local and non-sequential [2].\n\n(Additionally, there are reasons to think that quantum computation, in\none particular case based upon geometric phase or Berry phase, is\nextra-dynamical which means that the process of quantum computation\ncan transcend the usual dynamical and linear time evolution of a\nquantum system [3]).\n\nBack in 1997, I told M. Bershadsky (who was at Harvard U. at the time)\nthat I had once read that Richard Feynman thought that wave-particle\nduality was the most fundamental aspect of QM, and I also told\nBershadsky some speculations about using T-duality on the worldsheet\nto try to derive the wave-particle duality of QM.\n\nHowever, such speculations were fruitless because I could not figure\nout how to get SUSY to work in my scenario to derive the wave-particle\nduality needed for fermions, and nor was I sure if I could really\ncapture the non-locality of QM.\n\nNow, I know better and that a more fundamentally noncommutative\napproach would be needed. However, perhaps N. Seiberg is _too_ smart\nbecause, as I seem to recall, he thought of how stringy effects can\ncancel out acausality in at least one of his models about NC fields\n:-)\n\nMore seriously, though, paper [2] seems to imply that string theory\nhas to be compatible with not just the non-local behavior of the\nwavefunction in QM but also with its non-sequential behavior.\n\nWhat appeals to me about the NLSTs in [1] is that they are non-local\nboth in spacetime and on the worldsheet, and so do you think that\nNLSTs would be the best string theory framework to start with for then\nthinking about potential non-sequential or acausal effects? (It has\nbeen about three years since I have thought about any potential\nacausality in string theory physics.)\n\n\n[1] http://arxiv.org/abs/hep-th/0105309\n\n[2] http://arxiv.org/abs/quant-ph/0102109\n\n[3] http://arxiv.org/abs/quant-ph/0005069\n\nsee also http://arxiv.org/abs/quant-ph/0010081\n\n\n--------------\n\n</UL></PRE></font></td></tr></table></BODY><HTML>');"> <IMG SRC=/images/buttons/ip.gif BORDER=0 ALIGN=CENTER ALT="View this Usenet post in original ASCII form"> View this Usenet post in original ASCII form </a></div><P></jabberwocky>First, I would like to say "Hi" to Lubos and Urs and to thank them for
being two of the moderators of this newsgroup.
For those of you who may not know, Lubos was the first person to
analytically prove Hod's conjecture about the quasinormal modes of
black holes, and later I will post about what QNMs may mean in
determining whether it is even feasable for dS space to contain a
finite dimensional Hilbert space, i.e. unless somebody else has
already posted on this topic.
In the meantime, let us consider a question which may be even more
difficult :-)
Speaking of analytical proofs, I once tried to figure out whether
acausal effects can arise in the non-local string theories (NLSTs)
first described in [1] because I wanted to use such knowledge for
demonstrating the superiority of Maldacena's version of holography vs.
any potential axiomatic QFT versions of holography such as those of
Rehren.
However, before I could see an answer to the question of acausal
effects I noticed that U. Trittman had found that Maldacena's
conjecture is superior by instead using numerical simulations, and
then I forgot about the acausality question.
Now, though, I am reminded of this issue about acausality because
someone referred me to a brief four page paper which descibes a
relatively simple experiment showing that the wavefunction in QM is
both non-local and non-sequential [2].
(Additionally, there are reasons to think that quantum computation, in
one particular case based upon geometric phase or Berry phase, is
extra-dynamical which means that the process of quantum computation
can transcend the usual dynamical and linear time evolution of a
quantum system [3]).
Back in 1997, I told M. Bershadsky (who was at Harvard U. at the time)
that I had once read that Richard Feynman thought that wave-particle
duality was the most fundamental aspect of QM, and I also told
Bershadsky some speculations about using T-duality on the worldsheet
to try to derive the wave-particle duality of QM.
However, such speculations were fruitless because I could not figure
out how to get SUSY to work in my scenario to derive the wave-particle
duality needed for fermions, and nor was I sure if I could really
capture the non-locality of QM.
Now, I know better and that a more fundamentally noncommutative
approach would be needed. However, perhaps N. Seiberg is _too_ smart
because, as I seem to recall, he thought of how stringy effects can
cancel out acausality in at least one of his models about NC fields
:-)
More seriously, though, paper [2] seems to imply that string theory
has to be compatible with not just the non-local behavior of the
wavefunction in QM but also with its non-sequential behavior.
What appeals to me about the NLSTs in [1] is that they are non-local
both in spacetime and on the worldsheet, and so do you think that
NLSTs would be the best string theory framework to start with for then
thinking about potential non-sequential or acausal effects? (It has
been about three years since I have thought about any potential
acausality in string theory physics.)
[1] http://arxiv.org/abs/http://www.arxiv.org/abs/hep-th/0105309
[2] http://arxiv.org/abs/http://www.arxiv.org/abs/quant-ph/0102109
[3] http://arxiv.org/abs/http://www.arxiv.org/abs/quant-ph/0005069
see also http://arxiv.org/abs/http://www.arxiv.org/abs/quant-ph/0010081
--------------
being two of the moderators of this newsgroup.
For those of you who may not know, Lubos was the first person to
analytically prove Hod's conjecture about the quasinormal modes of
black holes, and later I will post about what QNMs may mean in
determining whether it is even feasable for dS space to contain a
finite dimensional Hilbert space, i.e. unless somebody else has
already posted on this topic.
In the meantime, let us consider a question which may be even more
difficult :-)
Speaking of analytical proofs, I once tried to figure out whether
acausal effects can arise in the non-local string theories (NLSTs)
first described in [1] because I wanted to use such knowledge for
demonstrating the superiority of Maldacena's version of holography vs.
any potential axiomatic QFT versions of holography such as those of
Rehren.
However, before I could see an answer to the question of acausal
effects I noticed that U. Trittman had found that Maldacena's
conjecture is superior by instead using numerical simulations, and
then I forgot about the acausality question.
Now, though, I am reminded of this issue about acausality because
someone referred me to a brief four page paper which descibes a
relatively simple experiment showing that the wavefunction in QM is
both non-local and non-sequential [2].
(Additionally, there are reasons to think that quantum computation, in
one particular case based upon geometric phase or Berry phase, is
extra-dynamical which means that the process of quantum computation
can transcend the usual dynamical and linear time evolution of a
quantum system [3]).
Back in 1997, I told M. Bershadsky (who was at Harvard U. at the time)
that I had once read that Richard Feynman thought that wave-particle
duality was the most fundamental aspect of QM, and I also told
Bershadsky some speculations about using T-duality on the worldsheet
to try to derive the wave-particle duality of QM.
However, such speculations were fruitless because I could not figure
out how to get SUSY to work in my scenario to derive the wave-particle
duality needed for fermions, and nor was I sure if I could really
capture the non-locality of QM.
Now, I know better and that a more fundamentally noncommutative
approach would be needed. However, perhaps N. Seiberg is _too_ smart
because, as I seem to recall, he thought of how stringy effects can
cancel out acausality in at least one of his models about NC fields
:-)
More seriously, though, paper [2] seems to imply that string theory
has to be compatible with not just the non-local behavior of the
wavefunction in QM but also with its non-sequential behavior.
What appeals to me about the NLSTs in [1] is that they are non-local
both in spacetime and on the worldsheet, and so do you think that
NLSTs would be the best string theory framework to start with for then
thinking about potential non-sequential or acausal effects? (It has
been about three years since I have thought about any potential
acausality in string theory physics.)
[1] http://arxiv.org/abs/http://www.arxiv.org/abs/hep-th/0105309
[2] http://arxiv.org/abs/http://www.arxiv.org/abs/quant-ph/0102109
[3] http://arxiv.org/abs/http://www.arxiv.org/abs/quant-ph/0005069
see also http://arxiv.org/abs/http://www.arxiv.org/abs/quant-ph/0010081
--------------