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View Full Version : Re: Is energy more fundamental than mass?


Ilja Schmelzer
Mar23-05, 04:33 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>To the question in the subject:\n\nYes. Energy appears as part of the energy-momentum tensor\nin the equations of gravity\n\nG_mn = T_mn\n\nMoreover, it is conserved (even in GR using the\npseudo-tensor), but mass not\n(positron + electron -&gt; light)\n\nIlja\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>To the question in the subject:

Yes. Energy appears as part of the energy-momentum tensor
in the equations of gravity

G_{mn} = T_{mn}

Moreover, it is conserved (even in GR using the
pseudo-tensor), but mass not
(positron + electron -> light)

Ilja

mathman
Mar23-05, 03:42 PM
The electron-positron to energy reaction is reversible. Gamma rays above 1.022 Mev in energy can turn into an electron positron pair under the right conditions, such as when passing through lead.