Probing grand unified theories with cosmic ray, gamma-ray and neutrino astrophysics

We explore scenarios where the highest energy cosmic rays are produced by new particle physics near the grand unification scale. Using detailed numerical simulations of extragalactic nucleon, gamma-ray, and neutrino propagation, we show the existence of an interesting parameter range for which such scenarios may explain part of the data and are consistent with all observational constraints. A combination of proposed observatories for ultra-high energy cosmic rays, neutrino telescopes of a few kilometer scale, and gamma-ray astrophysics instruments should be able to test these scenarios. In particular, for neutrino masses in the eV range, exclusive neutrino decay modes of superheavy particles can give rise to neutrino fluxes comparable to those predicted in models of active galactic nuclei.

Note:

15 latex pages, 5 postscript figures included, uses revtex.sty and psfig.sty. Submitted to Physical Review D

grand unified theory: validity test
cosmic radiation: energy spectrum
photon: cosmic radiation
neutrino: astrophysics
nucleon: astrophysics
postulated particle: massive
postulated particle: decay
flux
energy spectrum
numerical calculations

References(65)

Figures(0)

Evidence for correlated changes in the spectrum and composition of cosmic rays at extremely high-energies

HiRes

Collaboration

•

D.J. Bird

et al.

- Phys.Rev.Lett. 71 (1993) 3401-3404
•
DOI:
- 10.1103/PhysRevLett.71.3401

The Cosmic ray energy spectrum observed by the Fly's Eye

HiRes

Collaboration

•

D.J. Bird
(
- Illinois U., Urbana and
- Utah U. and
- Adelaide U.
)

et al.

- Astrophys.J. 424 (1994) 491-502
•
DOI:
- 10.1086/173906

Detection of a cosmic ray with measured energy well beyond the expected spectral cutoff due to cosmic microwave radiation

HIRES

Collaboration

•

D.J. Bird
(
- Illinois U., Urbana and
- Utah U.
)

et al.

- Astrophys.J. 441 (1995) 144-150
•
e-Print:
- astro-ph/9410067
•
DOI:
- 10.1086/175344

Observation of a very energetic cosmic ray well beyond the predicted 2.7-K cutoff in the primary energy spectrum

et al.

- Phys.Rev.Lett. 73 (1994) 3491-3494
•
DOI:
- 10.1103/PhysRevLett.73.3491

The Cosmic ray energy spectrum above 3 x 10**18-eV measured by the Akeno Giant Air Shower Array

S. Yoshida
(
- Tokyo U., ICRR and
- Tokyo Inst. Tech.
)
,
N. Hayashida
(
- Tokyo U., ICRR
)
,
K. Honda
(
- Yamanashi U.
)
,
M. Honda
(
- Tokyo U., ICRR
)
,
S. Imaizumi
(
- Saitama U.
)

et al.

- Astropart.Phys. 3 (1995) 105-124
•
DOI:
- 10.1016/0927-6505(94)00036-3

Extension of the cosmic ray energy spectrum beyond the predicted Greisen-Zatsepin-Kuz'min cutoff

et al.

- Phys.Rev.Lett. 81 (1998) 1163-1166
•
e-Print:
- astro-ph/9807193
•
DOI:
- 10.1103/PhysRevLett.81.1163

Particle Acceleration at Astrophysical Shocks: A Theory of Cosmic Ray Origin

R. Blandford
(
- Caltech
)
,
D. Eichler
(
- Maryland U. and
- Ben Gurion U. of Negev
)

- Phys.Rept. 154 (1987) 1-75
•
DOI:
- 10.1016/0370-1573(87)90134-7

The Origin of Ultrahigh-Energy Cosmic Rays

A.M. Hillas
(
- Leeds U.
)

- Ann.Rev.Astron.Astrophys. 22 (1984) 425-444,
- In *Burbidge, G. ( Ed.) Et Al.: Annual Review Of Astronomy and Astrophysics, Vol. 22*, 425-444,
- In *Lamb, F.k. ( Ed.): High Energy Astrophysics*, 277-296
•
DOI:
- 10.1146/annurev.aa.22.090184.002233