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View Full Version : 3d event horizon defines GR-compatible spacetime?


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Jun29-04, 05:39 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>I\'m doing research for a book (not about physics) and would appreciate\nany references that address these questions...\n\nIf a 2d event horizon fully defines the entropy or information of the\n3d entity inside it (per Berkenstein & Hawking), would a 3d event\nhorizon fully define the information or state of a 4d spacetime?\n\nWould many/any solutions to GR apply in that spacetime?\n\nCould it be argued that only the present state or moment is extant in\nthat spacetime as that 3d surface is all that is required to fully\nspecify it?\n\nCould the LQG spin network that comprises that 3d surface be\nconsidered a quantum "computer" that instantiates (decoheres?) the\nnext moment or future?\n\nCould that spin network be considered the wavefunction for that 4d\nspacetime?\n\nThanks in advance!\n\nLiam Breck\nNetwork Improv\nBoston, Mass. USA\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">&nbsp;&nbsp;View this Usenet post in original ASCII form </a></div><P></jabberwocky>I'm doing research for a book (not about physics) and would appreciate
any references that address these questions...

If a 2d event horizon fully defines the entropy or information of the
3d entity inside it (per Berkenstein & Hawking), would a 3d event
horizon fully define the information or state of a 4d spacetime?

Would many/any solutions to GR apply in that spacetime?

Could it be argued that only the present state or moment is extant in
that spacetime as that 3d surface is all that is required to fully
specify it?

Could the LQG spin network that comprises that 3d surface be
considered a quantum "computer" that instantiates (decoheres?) the
next moment or future?

Could that spin network be considered the wavefunction for that 4d
spacetime?

Thanks in advance!

Liam Breck
Network Improv
Boston, Mass. USA