strings and expansion of the universe [Archive]

alistair

Dec2-04, 03:54 AM

Dec13-04, 03:13 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>\n"alistair" <alistair@goforit64.fsnet.co.uk> wrote in message\nnews:861c1b21.0411300709.134c4ddd-100000@posting.google.com...\n> When strings are compressed to around 10^-34 metres their energy\n> rises.\n>A volume of space made from compressed strings would expand and\n> release energy.\n\nBut how [and when] do you compress the strings? Where do\nyou take the energy from?\n\n> Could this be how dark energy forms in the universe?\n\nCould be. Anything can be, which is not in direct and\nblatant contradiction to what we observe.\n\nBut why not go further and say directly, that dark\nenergy might be string tension? Why this business of\ncompression and [I guess you mean subsequent] expansion?\nWhere do strings become "compressed" in the expanding\nuniverse?\n\n> It is interesting to note that if each string is a photon of\n> wavelength 10^-34 metres, this would give a vacuum energy density of\n> 10^114 Joules/m^3\n> which is one of the values often quoted for the quantum mechanical\n> calculation of vacuum energy.\n\nThe same argument applies to any "particle" or particle like\nobject of Planck length.\n\nBest MP\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>"alistair" <alistair@goforit64.fsnet.co.uk> wrote in message
news:861c1b21.0411300709.134c4ddd-100000@posting.google.com...
> When strings are compressed to around 10^-34 metres their energy
> rises.
>A volume of space made from compressed strings would expand and
> release energy.

But how [and when] do you compress the strings? Where do
you take the energy from?

> Could this be how dark energy forms in the universe?

Could be. Anything can be, which is not in direct and
blatant contradiction to what we observe.

But why not go further and say directly, that dark
energy might be string tension? Why this business of
compression and [I guess you mean subsequent] expansion?
Where do strings become "compressed" in the expanding
universe?

> It is interesting to note that if each string is a photon of
> wavelength 10^-34 metres, this would give a vacuum energy density of
> 10^114 Joules/m^3
> which is one of the values often quoted for the quantum mechanical
> calculation of vacuum energy.

The same argument applies to any "particle" or particle like
object of Planck length.

Best MP