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Simulations of Fast Neutrino Flavor Conversions with Interactions in Inhomogeneous Media
Guenter Sigl
We investigate toy models for spatial and temporal instabilities in collective neutrino oscillations induced by neutrino self-interactions, with special emphasis on inhomogeneous s…
Improved constraints on parton distributions using LHCb, ALICE and HERA heavy-flavour measurements and implications for the predictions for prompt atmospheric-neutrino fluxes
O. Zenaiev, M. V. Garzelli, K. Lipka +5
The impact of measurements of heavy-flavour production in deep inelastic scattering and in collisions on parton distribution functions is studied in a QCD analysis at nex…
Prompt neutrinos from atmospheric charm in the general-mass variable-flavor-number scheme
M. Benzke, M. V. Garzelli, B. A. Kniehl +3
We present predictions for the prompt-neutrino flux arising from the decay of charmed mesons and baryons produced by the interactions of high-energy cosmic rays in the Earth's atmo…
Prompt neutrino fluxes in the atmosphere with PROSA parton distribution functions
PROSA Collaboration, M. V. Garzelli, S. Moch +6
Effects on atmospheric prompt neutrino fluxes of present uncertainties affecting the nucleon composition are studied by using the PROSA fit to parton distribution functions (PDFs).…
Prompt neutrino flux in the atmosphere revisited
M. V. Garzelli, S. Moch, G. Sigl
Prompt neutrino fluxes due to the interactions of high-energy cosmic rays with the Earth's atmosphere are backgrounds in the search for high-energy neutrinos of galactic or extra-g…
Possible cosmogenic neutrino constraints on Planck-scale Lorentz violation
David M. Mattingly, Luca Maccione, Matteo Galaverni +2
We study, within an effective field theory framework, $O(E^{2}/\Mpl^{2})$ Planck-scale suppressed Lorentz invariance violation (LV) effects in the neutrino sector, whose size we pa…
Constraining resonant photon-axion conversions in the Early Universe
Alessandro Mirizzi, Javier Redondo, Guenter Sigl
The presence of a primordial magnetic field would have induced resonant conversions between photons and axion-like particles (ALPs) during the thermal history of the Universe. Thes…
Collective flavor transitions of supernova neutrinos
Guenter Sigl, Ricard Tomas, Andreu Esteban-Pretel +4
We give a very brief overview of collective effects in neutrino oscillations in core collapse supernovae where refractive effects of neutrinos on themselves can considerably modify…
Microwave Background Constraints on Mixing of Photons with Hidden Photons
Alessandro Mirizzi, Javier Redondo, Guenter Sigl
Various extensions of the Standard Model predict the existence of hidden photons kinetically mixing with the ordinary photon. This mixing leads to oscillations between photons and…
Lectures on Astroparticle Physics
Guenter Sigl
These are extended notes of a series of lectures given at the XIth Brazilian School of Cosmology and Gravitation. They provide a selection of topics at the intersection of particle…
Ultra-High Energy Neutrino Fluxes: New Constraints and Implications
Dmitry Semikoz, Guenter Sigl
We apply new upper limits on neutrino fluxes and the diffuse extragalactic component of the GeV gamma-ray flux to various scenarios for ultra high energy cosmic rays and neutrinos.…
Indirect Detection of Kaluza-Klein Dark Matter
Gianfranco Bertone, Geraldine Servant, Guenter Sigl
We investigate prospects for indirect detection of Kaluza--Klein dark matter, focusing on the annihilation radiation of the first Kaluza--Klein excitation of the Hypercharge gauge…
Cosmic Radiation Constraints on Low String Scale and Extra Dimension Cross Sections
Guenter Sigl
The observed interaction energy of cosmic rays with atmospheric nuclei reaches up to a PeV in the center of mass. We compute nucleon-nucleon and nucleon-neutrino cross sections for…
Ultra-High Energy Neutrino Fluxes and Their Constraints
Oleg E. Kalashev, Vadim A. Kuzmin, Dmitry V. Semikoz +1
Applying our recently developed propagation code we review extragalactic neutrino fluxes above 10^{14} eV in various scenarios and how they are constrained by current data. We spec…
Ultra-High Energy Cosmic Rays from Neutrino Emitting Acceleration Sources?
Oleg E. Kalashev, Vadim A. Kuzmin, Dmitry V. Semikoz +1
We demonstrate by numerical flux calculations that neutrino beams producing the observed highest energy cosmic rays by weak interactions with the relic neutrino background require…
Ultrahigh Energy Neutrinos and Cosmic Rays as Probes of New Physics
G. Sigl
Cosmic high energy neutrinos are inextricably linked to the origin of cosmic rays which is one of the major unresolved questions in astrophysics. In particular, the highest energy…
Cosmic Neutrinos and New Physics beyond the Electroweak Scale
Craig Tyler, Angela V. Olinto, Guenter Sigl
New physics beyond the electroweak scale may increase weak interaction cross sections beyond the Standard Model predictions. Such cross sections can be expected within theories tha…
Cosmic rays and neutrino interactions beyond the standard model
Guenter Sigl
Some solutions of the hierarchy problem of particle physics can lead to significantly increased neutrino cross sections beyond the electroweak scale. We discuss some consequences f…
On Metric Preheating
Karsten Jedamzik, Guenter Sigl
We consider the generation of super-horizon metric fluctuations during an epoch of preheating in the presence of a scalar field χquadratically coupled to the inflaton. We find that…
Probing Grand Unified Theories with Cosmic Ray, Gamma-Ray and Neutrino Astrophysics
Guenter Sigl, Sangjin Lee, Pijushpani Bhattacharjee +1
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 extragalact…
Numerical Toy-Model Calculation of the Nucleon Spin Autocorrelation Function in a Supernova Core
Georg Raffelt, Guenter Sigl
We develop a simple model for the evolution of a nucleon spin in a hot and dense nuclear medium. A given nucleon is limited to one-dimensional motion in a distribution of external,…
Extremely High Energy Neutrinos, Neutrino Hot Dark Matter, and the Highest Energy Cosmic Rays
Shigeru Yoshida, Guenter Sigl, Sangjin Lee
Extremely high energy (up to 10**(22) eV) cosmic neutrino beams initiate high energy particle cascades in the background of relic neutrinos from the Big Bang. We perform numerical…
Ultra-High Energy Neutrino-Nucleon Cross Section and Radiative Corrections
Guenter Sigl
A cubic kilometer scale experiment has been proposed to detect cosmic neutrinos of energy from tens of GeV up to the highest energies observed for cosmic rays, around 10**20 eV, or…
A Type II Supernovae Constraint on -
Xiangdong Shi, Guenter Sigl
The role of a resonant - oscillation is discussed in the event of a supernova explosion. It is concluded that a significant - mixing may hinder the ability of t…