Red Bull
Dec4-04, 10:57 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>I was just wondering if any knows more about what\nstring theory has to say about quantum fluctuations in\nthe context of inflationary perturbations.\n\nFirstly, should I think of the background fields in\nstring theory (i.e. the metric and the other massless\nfields on the target space) as observables in\nspacetime? In particular, do the equations on,\ng_\\mu\\nu etc imposed by scale invariance of the\nappropriate sigma model then describe the time\nevolution of their expectation values?\n\nI think that cosmologists think of inflationary\nperturbations as arising from a mode of some scalar\nfield operator collapsing into one\nparticular eigenstate. So they are thought (at least\nby some people) to be truly random.\n\nBut then how can the expectation value of the metric\n(say) be expected to evolve deterministically? If what\nthe cosmologists say is true then it seems that it\ndoesn\'t, or am I interpreting things incorrectly?\n\nAny thoughts appreciated.\n\n\n________________________________ __\nDo you Yahoo!?\nThe all-new My Yahoo! - Get yours free!\nhttp://my.yahoo.com\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>I was just wondering if any knows more about what
string theory has to say about quantum fluctuations in
the context of inflationary perturbations.
Firstly, should I think of the background fields in
string theory (i.e. the metric and the other massless
fields on the target space) as observables in
spacetime? In particular, do the equations on,
g_\mu\nu etc imposed by scale invariance of the
appropriate \sigma model then describe the time
evolution of their expectation values?
I think that cosmologists think of inflationary
perturbations as arising from a mode of some scalar
field operator collapsing into one
particular eigenstate. So they are thought (at least
by some people) to be truly random.
But then how can the expectation value of the metric
(say) be expected to evolve deterministically? If what
the cosmologists say is true then it seems that it
doesn't, or am I interpreting things incorrectly?
Any thoughts appreciated.
__{________________________________}
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The all-new My Yahoo! - Get yours free!
http://my.yahoo.com
string theory has to say about quantum fluctuations in
the context of inflationary perturbations.
Firstly, should I think of the background fields in
string theory (i.e. the metric and the other massless
fields on the target space) as observables in
spacetime? In particular, do the equations on,
g_\mu\nu etc imposed by scale invariance of the
appropriate \sigma model then describe the time
evolution of their expectation values?
I think that cosmologists think of inflationary
perturbations as arising from a mode of some scalar
field operator collapsing into one
particular eigenstate. So they are thought (at least
by some people) to be truly random.
But then how can the expectation value of the metric
(say) be expected to evolve deterministically? If what
the cosmologists say is true then it seems that it
doesn't, or am I interpreting things incorrectly?
Any thoughts appreciated.
__{________________________________}
Do you Yahoo!?
The all-new My Yahoo! - Get yours free!
http://my.yahoo.com