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Apr22-04, 02:41 PM
<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>Hi,\n\nI want to ask a question about the brane world model. In my understanding\nabout the brane world model, our 4-dimesion world is a brane in a\nhigher-dimension space, gravity can propagate in the bulk (I think some gauge\nboson can also propagate, as long as the bulk is a brane in some more higher\ndimension), other gauge boson are comfined in the brane. The thing I don\'t\nunderstand is, the brane is placed in the bulk, and there may be other\nbranes, I think there should be no constrains about the position of these\nbranes. But in those models, RS model for example, They compact the\nextradimension into a S1/Z2 orbifold, and place two branes on the fixed\npoints, thus make the brane the boundary of the bulk. I cannot see there is\nsome particular requirement for this kind of set up. Can these brane just\nmove around in the bulk? Or must there is a brane for the boundary of the\nbulk, cann\'t they just sit in the middle of the bulk for example? Any\ncomments or references are appreciated.\n\n--\nBest Regards,\nLR\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>Hi,
I want to ask a question about the brane world model. In my understanding
about the brane world model, our 4-dimesion world is a brane in a
higher-dimension space, gravity can propagate in the bulk (I think some gauge
boson can also propagate, as long as the bulk is a brane in some more higher
dimension), other gauge boson are comfined in the brane. The thing I don't
understand is, the brane is placed in the bulk, and there may be other
branes, I think there should be no constrains about the position of these
branes. But in those models, RS model for example, They compact the
extradimension into a S1/Z2 orbifold, and place two branes on the fixed
points, thus make the brane the boundary of the bulk. I cannot see there is
some particular requirement for this kind of set up. Can these brane just
move around in the bulk? Or must there is a brane for the boundary of the
bulk, cann't they just sit in the middle of the bulk for example? Any
comments or references are appreciated.
--
Best Regards,
LR
I want to ask a question about the brane world model. In my understanding
about the brane world model, our 4-dimesion world is a brane in a
higher-dimension space, gravity can propagate in the bulk (I think some gauge
boson can also propagate, as long as the bulk is a brane in some more higher
dimension), other gauge boson are comfined in the brane. The thing I don't
understand is, the brane is placed in the bulk, and there may be other
branes, I think there should be no constrains about the position of these
branes. But in those models, RS model for example, They compact the
extradimension into a S1/Z2 orbifold, and place two branes on the fixed
points, thus make the brane the boundary of the bulk. I cannot see there is
some particular requirement for this kind of set up. Can these brane just
move around in the bulk? Or must there is a brane for the boundary of the
bulk, cann't they just sit in the middle of the bulk for example? Any
comments or references are appreciated.
--
Best Regards,
LR