ZEU-THAT

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2017-06-19
14:04
[PUBDB-2017-05457] Journal Article
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Scenarios for Ultrafast Gamma-Ray Variability in AGN
ddc:520
We analyze three scenarios to address the challenge of ultrafast gamma-ray variability reported from active galactic nuclei. We focus on the energy requirements imposed by these scenarios: (i) external cloud in the jet, (ii) relativistic blob propagating through the jet material, and (iii) production of high-energy gamma-rays in the magnetosphere gaps [...]
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2017-06-06
14:54
OpenAccess [PUBDB-2017-04360] Preprint/Report
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Cosmic-Ray and Neutrino Emission from Gamma-Ray Bursts with a Nuclear Cascade
[DESY-17-078; arXiv:1705.08909]
 GO
We discuss neutrino and cosmic-ray emission from Gamma-Ray Bursts (GRBs) with the injection of nuclei, where we take into account that a nuclear cascade from photo-disintegration can fully develop in the source. One of our main objectives is to test if recent results from the IceCube and the Pierre Auger Observatory can be accommodated with the paradigm that GRBs are the sources of Ultra-High Energy Cosmic Rays (UHECRs) [...]
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2017-03-27
11:22
[PUBDB-2017-01466] Journal Article
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Bottom-up discrete symmetries for Cabibbo mixing
ddc:530
We perform a bottom-up search for discrete non-Abelian symmetries capable of quantizing the Cabibbo angle that parameterizes CKM mixing. Given a particular Abelian symmetry structure in the up and down sectors, we construct representations of the associated residual generators which explicitly depend on the degrees of freedom present in our effective mixing matrix. [...]
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2017-03-03
11:35
OpenAccess [PUBDB-2017-01283] Report/Journal Article
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Multi-messenger light curves from gamma-ray bursts in the internal shock model
[arXiv:1606.02325; DESY-16-108] ddc:520
Gamma-ray bursts (GRBs) are promising as sources of neutrinos and cosmic rays. In the internal shock scenario, blobs of plasma emitted from a central engine collide within a relativistic jet and form shocks, leading to particle acceleration and emission. [...]
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2017-03-03
11:27
arXiv [PUBDB-2017-01282] Report/Journal Article
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Astrophysical Neutrino Production Diagnostics with the Glashow Resonance
[arXiv:1611.07983] ddc:530
We study the Glashow resonance $\bar{\nu}_e + e^- \rightarrow W^- \rightarrow$ hadrons at 6.3 PeV as diagnostic of the production processes of ultra-high energy neutrinos. The focus lies on describing the physics of neutrino production from pion decay as accurate as possible by including the kinematics of weak decays and Monte Carlo simulations of pp and p$\gamma$ interactions. [...]
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2017-01-09
12:17
OpenAccess [PUBDB-2017-00300] Report/Journal Article
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Perspectives for tests of neutrino mass generation at the GeV scale: Experimental reach versus theoretical predictions
[DESY-16-136; arXiv:1607.07880] ddc:530
We discuss the parameter space reach of future experiments searching for heavy neutral leptons (HNLs). We consider the GeV seesaw model with three HNL generations and focus on two classes of models: generic assumptions (such as random mass matrices or the Casas-Ibarra parametrization) and flavor symmetry-generated models. [...]
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2017-01-06
16:30
OpenAccess [PUBDB-2017-00249] Report/Journal Article
; ; ; et al
Search for ultrarelativistic magnetic monopoles with the Pierre Auger observatory
[FERMILAB-PUB-16-373-AD-AE-CD-TD; arXiv:1609.04451] ddc:530
We present a search for ultrarelativistic magnetic monopoles with the Pierre Auger observatory. Such particles, possibly a relic of phase transitions in the early Universe, would deposit a large amount of energy along their path through the atmosphere, comparable to that of ultrahigh-energy cosmic rays (UHECRs). [...]
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2017-01-06
16:26
OpenAccess [PUBDB-2017-00248] Report/Journal Article
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Azimuthal asymmetry in the risetime of the surface detector signals of the Pierre Auger Observatory
[FERMILAB-PUB-16-094-AD-AE-CD-TD; arXiv:1604.00978] ddc:530
The azimuthal asymmetry in the risetime of signals in Auger surface detector stations is a source of information on shower development. The azimuthal asymmetry is due to a combination of the longitudinal evolution of the shower and geometrical effects related to the angles of incidence of the particles into the detectors. [...]
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2017-01-05
16:22
OpenAccess [PUBDB-2017-00203] Journal Article
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A Search for Brief Optical Flashes Associated with the SETI Target KIC 8462852
ddc:520
The F-type star KIC 8462852 has recently been identified as an exceptional target for search for extraterrestrial intelligence (SETI) observations. We describe an analysis methodology for optical SETI, which we have used to analyze nine hours of serendipitous archival observations of KIC 8462852 made with the VERITAS gamma-ray observatory between 2009 and 2015. [...]
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2017-01-05
15:19
OpenAccess [PUBDB-2017-00202] Journal Article
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Nonrelativistic Perpendicular Shocks Modeling Young Supernova Remnants : Nonstationary Dynamics and Particle Acceleration at Forward and Reverse Shocks
ddc:520
For parameters that are applicable to the conditions at young supernova remnants, we present results of two-dimensional, three-vector (2D3V) particle-in-cell simulations of a non-relativistic plasma shock with a large-scale perpendicular magnetic field inclined at a $45^\circ $ angle to the simulation plane to approximate three-dimensional (3D) physics. We developed an improved clean setup that uses the collision of two plasma slabs with different densities and velocities, leading to the development of two distinctive shocks and a contact discontinuity. [...]
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