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Date: Fri, 14 Sep 2007 17:17:24 +0200
From: "alessandro de angelis" <deangelis.alessandro@gmail.com>
To: xyz <xyz@castfvg.it>, "AFAM account" <info@afamweb.com>
Subject: Fwd: MAGIC su New Scientist dell'8 settembre
In-Reply-To: <66c06caf0709080840i776cec81l4868da78df0fc097@mail.gmail.com>
References: <66c06caf0709080840i776cec81l4868da78df0fc097@mail.gmail.com>
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Come responsabile scientifico di MAGIC devo dire che l'interpretazione va
oltre il risultato... Che spero sia per voi comunque interessante.

http://www.newscientist.com/channel/fundamentals/mg19526204.300-finally-a-magic-test-for-string-theory.html

Questa era la descrizione ufficiale che ho spedito in giro (un po' tecnica)

MAGIC detected a big gamma-ray flare in the galaxy Mkn501. The galaxy has a
black hole (BH) in the center, so the flare is probably due to a change in
its accretion rate (to simplify, a large mass falling in the BH). The
luminosiy of the galaxy doubled in 2 minutes. The arrival time of the
photons > 10 TeV was displaced by 4 minutes with respect to the arrival time
of the photons at about 100 GeV. This can be due to some peculiar dynamics
of the accretion process, or to a dependence of the speed of light on
energy. If we take tha last hypothesis, and we assume, as Amelino-Camelia
and Ellis, a dependence on the energy of the Quantum Gravity unification
scale E_QG such that v=c(1-E/E_QG), we obtain E_QG~0.03M_P, where M_P is the
Planck mass. I'ts a nice result - although it is not excluded that some
funny dynamics is at work... The paper is .
arXiv:0708.2889<http://xxx.lanl.gov/abs/0708.2889>

Cordiali saluti,
Alessandro

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<span class="gmail_quote">Come responsabile</span><span class="gmail_quote"> scientifico di MAGIC devo dire che l&#39;interpretazione va oltre il risultato... Che spero sia per voi comunque interessante.<br></span><br><a href="http://www.newscientist.com/channel/fundamentals/mg19526204.300-finally-a-magic-test-for-string-theory.html" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">



http://www.newscientist.com/channel/fundamentals/mg19526204.300-finally-a-magic-test-for-string-theory.html</a><br><br>Questa era la descrizione ufficiale che ho spedito in giro (un po&#39; tecnica)<br><br>MAGIC detected a big gamma-ray flare in the galaxy Mkn501. The galaxy
has a black hole (BH) in the center, so the flare is probably due to a
change in its accretion rate (to simplify, a large mass falling in
the BH). The luminosiy of the galaxy doubled in 2 minutes. The arrival
time of the photons &gt; 10 TeV was displaced by 4 minutes with respect
to the arrival time of the photons at about 100 GeV. This can be due to some
peculiar dynamics of the accretion process, or to a dependence of the
speed of light on energy. If we take tha last hypothesis, and we
assume, as Amelino-Camelia and Ellis, a dependence on the energy of the Quantum Gravity unification scale E_QG such that v=c(1-E/E_QG), we obtain
E_QG~0.03M_P, where M_P is the Planck mass. I&#39;ts a nice result - although it is not excluded that
some funny dynamics is at work... The paper is . <span><a href="http://xxx.lanl.gov/abs/0708.2889" title="Abstract" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">arXiv:0708.2889</a><br><br>Cordiali saluti,
<br>Alessandro<br></span>

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