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View Full Version : black holes collapsing to a singularity


alistair
Nov2-04, 12:38 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>\n\n\n\nCan the collapse of a star to a singularity be prevented if some of\nthe rest mass of a collapsing star becomes photons which create a\npressure that opposes gravity? The gravitational field outside the\nblack hole that forms from the collapsing star would still be what\ngeneral relativity says it should be.\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>Can the collapse of a star to a singularity be prevented if some of
the rest mass of a collapsing star becomes photons which create a
pressure that opposes gravity? The gravitational field outside the
black hole that forms from the collapsing star would still be what
general relativity says it should be.

Thomas Cuny
Nov3-04, 10:07 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>alistair wrote:\n\n&gt;\n&gt;\n&gt;\n&gt;\n&gt; Can the collapse of a star to a singularity be prevented if some of\n&gt; the rest mass of a collapsing star becomes photons which create a\n&gt; pressure that opposes gravity? The gravitational field outside the\n&gt; black hole that forms from the collapsing star would still be what\n&gt; general relativity says it should be.\nPhotons are not a source of antigravity. Photons are attracted by\ngravity.\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>alistair wrote:

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>
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> Can the collapse of a star to a singularity be prevented if some of
> the rest mass of a collapsing star becomes photons which create a
> pressure that opposes gravity? The gravitational field outside the
> black hole that forms from the collapsing star would still be what
> general relativity says it should be.
Photons are not a source of antigravity. Photons are attracted by
gravity.