View Full Version : TEV photons the product of matter-antimatter reactions?
<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\nthere are very high energy photons observed, in the MEV and TEV range.\n\nwhat i wonder is: is there a way to determine whether these photons\ncould be the result of matter-antimatter reactions? if large\nquantities of matter and anti-matter were to collide, esp. of higher\natomic numbers than 2, what range of photons would we observe, and how\ncould we distinguish such high energy photons from other processes\nsuch as acceleration of matter into a black hole?\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>there are very high energy photons observed, in the MEV and TEV range.
what i wonder is: is there a way to determine whether these photons
could be the result of matter-antimatter reactions? if large
quantities of matter and anti-matter were to collide, esp. of higher
atomic numbers than 2, what range of photons would we observe, and how
could we distinguish such high energy photons from other processes
such as acceleration of matter into a black hole?
Arvind Rajaraman
Apr15-04, 02:57 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>ensabah6@yahoo.com (Daniel) wrote in message news:<ba566c17.0404132208.13afab5d@posting.google. com>...\n> there are very high energy photons observed, in the MEV and TEV range.\n>\n> what i wonder is: is there a way to determine whether these photons\n> could be the result of matter-antimatter reactions? if large\n> quantities of matter and anti-matter were to collide, esp. of higher\n> atomic numbers than 2, what range of photons would we observe, and how\n> could we distinguish such high energy photons from other processes\n> such as acceleration of matter into a black hole?\n\nA very relevant paper is http://arxiv.org/abs/astro-ph/0404205. They\nargue that the spectrum of photons from annihilating particles is\ndifferent from astrophysical sources.\n\nThe abstract is: "Two ground-based experiments have recently\nindependently detected TeV \\$\\gamma\\$-rays from the direction of the\nGalactic center. The observations made by the VERITAS and CANGAROO\ncollaborations are unexpected, although not impossible to interpret in\nterms of astrophysical sources. Here we examine in detail whether the\nobserved \\$\\gamma\\$-rays may arise from the more exotic alternative of\nannihilations of dark matter particles clustered in the center of the\nGalaxy."\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>ensabah6@yahoo.com (Daniel) wrote in message news:<ba566c17.0404132208.13afab5d@posting.google.com>...
> there are very high energy photons observed, in the MEV and TEV range.
>
> what i wonder is: is there a way to determine whether these photons
> could be the result of matter-antimatter reactions? if large
> quantities of matter and anti-matter were to collide, esp. of higher
> atomic numbers than 2, what range of photons would we observe, and how
> could we distinguish such high energy photons from other processes
> such as acceleration of matter into a black hole?
A very relevant paper is http://arxiv.org/abs/astro-ph/0404205. They
argue that the spectrum of photons from annihilating particles is
different from astrophysical sources.
The abstract is: "Two ground-based experiments have recently
independently detected TeV $\gamma$-rays from the direction of the
Galactic center. The observations made by the VERITAS and CANGAROO
collaborations are unexpected, although not impossible to interpret in
terms of astrophysical sources. Here we examine in detail whether the
observed $\gamma$-rays may arise from the more exotic alternative of
annihilations of dark matter particles clustered in the center of the
Galaxy."
Danny Ross Lunsford
Apr15-04, 11:26 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>Daniel wrote:\n\n> what i wonder is: is there a way to determine whether these photons\n> could be the result of matter-antimatter reactions? if large\n> quantities of matter and anti-matter were to collide, esp. of higher\n> atomic numbers than 2, what range of photons would we observe, and how\n> could we distinguish such high energy photons from other processes\n> such as acceleration of matter into a black hole?\n\nI have an even more basic question - if a large amount of it is running\naround, how to even describe the radiation at all? There is no classical\nlimit. Certainly Maxwell-Lorentz alone (without further inputs) can\'t do it.\n\n-drl\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>Daniel wrote:
> what i wonder is: is there a way to determine whether these photons
> could be the result of matter-antimatter reactions? if large
> quantities of matter and anti-matter were to collide, esp. of higher
> atomic numbers than 2, what range of photons would we observe, and how
> could we distinguish such high energy photons from other processes
> such as acceleration of matter into a black hole?
I have an even more basic question - if a large amount of it is running
around, how to even describe the radiation at all? There is no classical
limit. Certainly Maxwell-Lorentz alone (without further inputs) can't do it.
-drl
vBulletin® v3.7.6, Copyright ©2000-2009, Jelsoft Enterprises Ltd.