Monday December 1, 2008, 6:01 am

GZK Photons as Ultra High Energy Cosmic Rays

Authors: Gelmini, Graciela B.; Kalashev, Oleg E.; Semikoz, Dmitry V.

We calculate the flux of "GZK-photons", namely the flux of Ultra High

Energy Cosmic Rays (UHECR) consisting of photons produced by extragalactic

nucleons through the resonant photoproduction of pions, the so called GZK effect. We We calculate the flux of "GZK-photons", namely the flux of Ultra High Energy Cosmic Rays (UHECR) consisting of photons produced by extragalactic nucleons through the resonant photoproduction of pions, the so called GZK effect. We show that, for primary nucleons, the GZK photon fraction of the total UHECR flux is between 10-4 and 10-2 above 1019 eV and up to the order of 0.1 above 1020 eV. The GZK photon flux depends on the assumed UHECR spectrum, slope of the nucleon flux at the source, distribution of sources and intervening backgrounds. Detection of this photon flux would open the way for UHECR gamma-ray astronomy. Detection of a larger photon flux would imply the emission of photons at the source or new physics. We compare the photon fractions expected for GZK photons and the minimal predicted by Top-Down models. We find that the photon fraction above 1019 eV is a crucial test for Top-Down models.
Comment: 21 pages, 18 figures with 35 panels in version 3 (substantial changes to the "Topological defects", "SHDM" and "Photon fractions" subsections were made with respect to version 2)
Full-text available from: Cached PDF
Linked PDF (experimental)
http://arxiv.org/abs/astro-ph/0506128

Monday December 8, 2008, 2:37 am
=======================
just in case any one thinks I'm gone, I'm here. the Eric, Randy, care2

person, that works for queen elizabeth, suspended my account, again,

after care2 deleted over 200 front page stories, that you are not allowed

to see, I guess they are worried about you figuring out something I've

been trying to tell you..again..

it takes about 3 minutes to open a new care2 account.

I'm pretty bored anyways, its about 5:00am, not tired not hungry,

no reason for suspension... care2 are a bunch of nwo controlled,

wait for the end to come, forget about their and your children,..type of

people

thats who I take the abuse for,.. it would be nice to know that they have

past next dec 31 2009, to be alive, and free.


Scott Shaubel, Lizzy, I've had it, time to crank it up, you are done, I have

not been wrong yet, and the only thing you have been able to do to me

in 2 years is suspend my care2 account,..

hahahahahah, I am laughing at you liz, you are done like dinner,.


don't be disalusioned by their lies. codex, nau,...are real.

Scott Shaubel
.. still here,.. always around,

=============================
every lyric and song I put in get deleted, every time I say queen

elizabeth, it gets deleted,
all were front page stories, voted by you,


wake up, speak up, stand up for your rights,..

Scott Shaubel
.. still here,.. always around,
==========================

this part,..is exactly correct..by a dead Bob Marley

But if you know what life is worth,You will look for yours on earth:
We sick an tired of-a your ism-skism game ...
-Dyin n goin to heaven in-a jesus name,.. lord.We know when we
understand:..Almighty,... God .... is a living man...You can fool some

people
sometimes,..But you cant fool all the people all the time...So now we

see the light
...what you gonna do?... We gonna stand up for our rights! yeah.

Scott Shaubel
.. still here,.. always around,
=======================================

Monday December 8, 2008, 3:12 am


this part,is exactly correct,from a dead Bob Marley...take note,..

But if you know what life is worth,You will look for yours on earth:
We sick an tired of-a your ism-skism game ...
-Dyin n goin to heaven in-a jesus name,.. lord.We know when we
understand:..Almighty,... God .... is a living man...You can fool some people
sometimes,..But you cant fool all the people all the time...So now we see the light
...what you gonna do?... We gonna stand up for our rights! yeah.

Scott