Results 1 - 10
of
43
FNAL-PUB-08-215-A-T Gravitational Wave Bursts from Cosmic Superstring Reconnections
, 901
"... We compute the gravitational waveform produced by cosmic superstring reconnections. This is done by first constructing the superstring reconnection trajectory, which closely resembles that of classical, instantaneous reconnection but with the singularities smoothed out due to the string path integra ..."
Abstract
-
Cited by 3 (0 self)
- Add to MetaCart
(Show Context)
We compute the gravitational waveform produced by cosmic superstring reconnections. This is done by first constructing the superstring reconnection trajectory, which closely resembles that of classical, instantaneous reconnection but with the singularities smoothed out due to the string path integral. We then evaluate the graviton vertex operator in this background to obtain the burst amplitude. The result is compared to the detection threshold for current and future gravitational wave detectors, finding that neither bursts nor the stochastic background would be detectable by Advanced LIGO. This disappointing but anticipated conclusion holds even for the most optimistic values of the reconnection probability and loop sizes. 1 1
Top-Down Models and Extremely High Energy Cosmic Rays
, 1999
"... We developed numerical code for calculation of the extragalactic component of the spectra of leptons, nucleons and γ-rays resulting from “top-down ” (nonacceleration) models for the case of uniform and isotropic source distribution. We explored two different classes of “top-down ” scenarios: the wid ..."
Abstract
-
Cited by 1 (1 self)
- Add to MetaCart
(Show Context)
We developed numerical code for calculation of the extragalactic component of the spectra of leptons, nucleons and γ-rays resulting from “top-down ” (nonacceleration) models for the case of uniform and isotropic source distribution. We explored two different classes of “top-down ” scenarios: the wide earlier investigated class of X particles coming from collapse and/or annihilation of cosmic topological defects (such as cosmic strings, monopoles, etc.) and the models of super-heavy long-living X particles with lifetime of the order or much greater than the current Universe age. I.
PHYSICS OF EXTREMELY HIGH ENERGY COSMIC RAYS
, 2000
"... Over the last third of the century, a few tens of events, detected by ground-based cosmic ray detectors, have opened a new window in the field of high-energy astrophysics. These events have macroscopic energies- exceeding 5 × 10 19 eV-, unobserved sources- if supposed to be in our vicinity-, an unkn ..."
Abstract
-
Cited by 1 (0 self)
- Add to MetaCart
Over the last third of the century, a few tens of events, detected by ground-based cosmic ray detectors, have opened a new window in the field of high-energy astrophysics. These events have macroscopic energies- exceeding 5 × 10 19 eV-, unobserved sources- if supposed to be in our vicinity-, an unknown chemical composition and a production and transport mechanism yet to be explained. With a flux as low as one particle per century per square kilometer, only dedicated detectors with huge apertures can bring in the high-quality and statistically significant data needed to answer those questions. In this article, we review the present status of the field both from an experimental and theoretical point of view. Special attention is given to the next generation of detectors devoted to the thorough exploration of the highest energy ranges. 1.
1Artificial Neural Network as a FPGA Trigger for a Detection of Very Inclined Air Showers
"... Abstract—The observation of ultra-high energy neutrinos (UHEνs) has become a priority in experimental astroparticle physics. Neutrinos can interact in the atmosphere (downward-going ν) or in the Earth crust (Earth-skimming ν), producing air showers that can be observed with arrays of detectors at th ..."
Abstract
-
Cited by 1 (1 self)
- Add to MetaCart
(Show Context)
Abstract—The observation of ultra-high energy neutrinos (UHEνs) has become a priority in experimental astroparticle physics. Neutrinos can interact in the atmosphere (downward-going ν) or in the Earth crust (Earth-skimming ν), producing air showers that can be observed with arrays of detectors at the ground. The surface detector array of the Pierre Auger Ob-servatory can detect these types of cascades. The distinguishing signature for neutrino events is the presence of very inclined showers produced close to the ground (i.e., after having traversed a large amount of atmosphere). Up to now, the Pierre Auger Observatory did not find any candidate for a neutrino event. This imposes competitive limits to the diffuse flux of UHEνs. A very low rate of events potentially generated by neutrinos is a significant challenge for a detection technique and requires both sophisticated algorithms and high-resolution hardware. We
The Antarctic Muon And Neutrino Detector Array (AMANDA) is a
"... Search for neutrino-induced cascades with 5 years of the AMANDA-II data DISSERTATION zur Erlangung des akademischen Grades doctor rerum naturalium (Dr. rer. nat.) ..."
Abstract
- Add to MetaCart
Search for neutrino-induced cascades with 5 years of the AMANDA-II data DISSERTATION zur Erlangung des akademischen Grades doctor rerum naturalium (Dr. rer. nat.)
Study of the performance of the Pierre Auger Observatory
, 2007
"... ii Die Dissertation kann wie folgt zitiert werden: urn:nbn:de:hbz:468-20070890 ..."
Abstract
- Add to MetaCart
(Show Context)
ii Die Dissertation kann wie folgt zitiert werden: urn:nbn:de:hbz:468-20070890
Reconstruction of the Primary Energy Spectrum from Fluorescence Telescope Data
"... Die Dissertation kann wie folgt zitiert werden: ..."
(Show Context)
Signatures of galactic magnetic lensing
, 2000
"... Preprint typeset in JHEP style.- HYPER VERSION. ..."
(Show Context)
