Stringy Space-Time Foam and High-Energy Cosmic Photons
نویسندگان
چکیده
منابع مشابه
Ultrahigh-energy photons as probes of Lorentz symmetry violations in stringy space-time foam models.
The time delays between γ rays of different energies from extragalactic sources have often been used to probe quantum gravity models in which Lorentz symmetry is violated. It has been claimed that these time delays can be explained by or at least put the strongest available constraints on quantum gravity scenarios that cannot be cast within an effective field theory framework, such as the space...
متن کاملSpacetime foam and high-energy photons
It is shown that high-energy astrophysics can provide information on the small-scale structure of spacetime.
متن کاملSpace Time Fluctuations and Ultra High Energy Cosmic Ray Interactions
The intimate geometry of space-time is expected to suffer stochastic fluctuations as a result of quantum gravitational effects. These fluctuations may induce observable consequences on the propagation of high energy particles over large distances, so that the strength and the characteristics of these fluctuations may be constrained, mainly in the range of energies of interest for cosmic ray phy...
متن کاملPhotons with sub-Planckian energy cannot efficiently probe space-time foam
Extra-galactic sources of photons have been used to constrain space-time quantum fluctuations in the Universe. In these proposals, the fundamental “fuzziness” of distance caused by space-time quantum fluctuations has been directly identified with fluctuations in optical paths. Phase-front corrugations deduced from these optical-path fluctuations are then applied to light from extra-galactic poi...
متن کاملDouble Pair Production by Ultra High Energy Cosmic Ray Photons
Using CompHEP package we’ve made the detailed estimate of the influence of double ee pair production (DPP) by photons on the propagation of ultra high energy electromagnetic (EM) cascade. We show that in the models in which cosmic ray photons energy reaches few×103 EeV refined DPP analysis may lead to substantial difference in predicted photon spectrum compared to previous rough estimates.
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Physics: Conference Series
سال: 2011
ISSN: 1742-6596
DOI: 10.1088/1742-6596/283/1/012022