View Full Version : dark energy and strings
alistair
Jun28-04, 09:39 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>The total amount of dark energy in the universe increases with the\npassage of time (in the epoch we are living in).Can string theory tell\nus where the dark energy is coming from? What is its source?\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>The total amount of dark energy in the universe increases with the
passage of time (in the epoch we are living in).Can string theory tell
us where the dark energy is coming from? What is its source?
<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>alistair <alistair@goforit64.fsnet.co.uk> wrote in message news:<861c1b21.0406260929.12b3246b-100000@posting.google.com>...\n\n> The total amount of dark energy in the universe increases with the\n> passage of time (in the epoch we are living in).Can string theory tell\n> us where the dark energy is coming from? What is its source?\n\nThe dark energy is the energy of the vacuum, so as the Universe\nexpands, there is more vacuum, and thus more vacuum energy.\n\nDavid\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>alistair <alistair@goforit64.fsnet.co.uk> wrote in message news:<861c1b21.0406260929.12b3246b-100000@posting.google.com>...
> The total amount of dark energy in the universe increases with the
> passage of time (in the epoch we are living in).Can string theory tell
> us where the dark energy is coming from? What is its source?
The dark energy is the energy of the vacuum, so as the Universe
expands, there is more vacuum, and thus more vacuum energy.
David
alistair
Jul1-04, 03:44 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>Could dark energy be gravitons leaking into our brane from another\nbrane,\nso that an observer on the other brane is experiencing a decceleration\nof the expansion of space?\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>Could dark energy be gravitons leaking into our brane from another
brane,
so that an observer on the other brane is experiencing a decceleration
of the expansion of space?
<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>alistair <alistair@goforit64.fsnet.co.uk> wrote in message news:<861c1b21.0406301323.2199c91e-100000@posting.google.com>...\n> Could dark energy be gravitons leaking into our brane from another\n> brane,\n> so that an observer on the other brane is experiencing a decceleration\n> of the expansion of space?\n\n\nThere may be gravitons entering our brane that came from other branes\nbut that would not cause dark energy. However, people have theorized\nsolutions to the dark energy problem within the context of brane world\nmodels, such as that inflation could be caused by the distance between\nthe branes or the angle between intersecting branes.\n\nDavid\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>alistair <alistair@goforit64.fsnet.co.uk> wrote in message news:<861c1b21.0406301323.2199c91e-100000@posting.google.com>...
> Could dark energy be gravitons leaking into our brane from another
> brane,
> so that an observer on the other brane is experiencing a decceleration
> of the expansion of space?
There may be gravitons entering our brane that came from other branes
but that would not cause dark energy. However, people have theorized
solutions to the dark energy problem within the context of brane world
models, such as that inflation could be caused by the distance between
the branes or the angle between intersecting branes.
David
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