Azimuthal peculiarities of gamma-ray-hadron families and the new physics at $$\sqrt s $$ ≳ TeVTeV

1996 ◽  
Vol 19 (6) ◽  
pp. 1005-1010 ◽  
Author(s):  
R. A. Mukhamedshin
Keyword(s):  
Gamma Ray ◽  
New Physics

scholarly journals A C++ Cherenkov photons simulation in CORSIKA 8

2021 ◽  
Vol 251 ◽  
pp. 03011
Author(s):  
Matthieu Carrère ◽  
Luisa Arrabito ◽  
Johan Bregeon ◽  
David Parello ◽  
Philippe Langlois ◽  
...  
Keyword(s):  
High Performance ◽  
Gamma Ray ◽  
New Physics ◽  
Performance Comparison ◽  
Object Oriented Programming ◽  
Physical Models ◽  
Air Showers ◽  
Cherenkov Photon ◽  
Photon Propagation ◽  
Standard Software

CORSIKA is a standard software for simulations of air showers induced by cosmic rays. It has been developed mainly in Fortran 77 continuously over the last thirty years. It has become very difficult to add new physics features to CORSIKA 7. CORSIKA 8 aims to be the future of the CORSIKA project. It is a framework in C++17 which uses modern concepts in object oriented programming for an efficient modularity and flexibility. The CORSIKA 8 project aims to attain high performance by exploiting techniques such as vectorization, gpu/cpu parallelization, extended use of static polymorphism and the most precise physical models available. In this paper, we focus on the Cherenkov photon propagation module of CORSIKA, which is of particular interest for gamma-ray experiments, like the Cherenkov Telescope Array. First, we present the optimizations that we have applied to the Cherenkov module thanks to the results of detailed profiling using performance counters. Then, we report our preliminary work to develop the Cherenkov Module in the CORSIKA 8 framework. Finally, we will demonstrate the first performance comparison with the current CORSIKA software as well as physics validation.

scholarly journals Searches for Violation of CPT Symmetry and Lorentz Invariance with Astrophysical Neutrinos

Universe ◽  
2022 ◽  
Vol 8 (1) ◽  
pp. 42
Author(s):  
Celio A. Moura ◽  
Fernando Rossi-Torres
Keyword(s):  
Gamma Ray ◽  
Lorentz Invariance ◽  
New Physics ◽  
Time Signal ◽  
Cpt Symmetry ◽  
Symmetry Violation ◽  
Oscillation Phase ◽  
Astrophysical Neutrinos ◽  
Charge Parity ◽  
Violation Of Lorentz Invariance

Neutrinos are a powerful tool for searching physics beyond the standard model of elementary particles. In this review, we present the status of the research on charge-parity-time (CPT) symmetry and Lorentz invariance violations using neutrinos emitted from the collapse of stars such as supernovae and other astrophysical environments, such as gamma-ray bursts. Particularly, supernova neutrino fluxes may provide precious information because all neutrino and antineutrino flavors are emitted during a burst of tens of seconds. Models of quantum gravity may allow the violation of Lorentz invariance and possibly of CPT symmetry. Violation of Lorentz invariance may cause a modification of the dispersion relation and, therefore, in the neutrino group velocity as well in the neutrino wave packet. These changes can affect the arrival time signal registered in astrophysical neutrino detectors. Direction or time-dependent oscillation probabilities and anisotropy of the neutrino velocity are manifestations of the same kind of new physics. CPT violation, on the other hand, may be responsible for different oscillation patterns for neutrino and antineutrino and unconventional energy dependency of the oscillation phase or of the mixing angles. Future perspectives for possible CPT and Lorentz violating systems are also presented.

scholarly journals Missing Gamma-Ray Halos and the Need for New Physics in the Gamma-Ray Sky

2018 ◽  
Vol 868 (2) ◽  
pp. 87 ◽  
Author(s):  
Avery E. Broderick ◽  
Paul Tiede ◽  
Philip Chang ◽  
Astrid Lamberts ◽  
Christoph Pfrommer ◽  
...  
Keyword(s):  
Gamma Ray ◽  
New Physics

scholarly journals Astroparticle Physics with H.E.S.S.: recents results and nearfuture prospects

2019 ◽  
Vol 209 ◽  
pp. 01054
Author(s):  
Emmanuel Moulin
Keyword(s):  
Dark Matter ◽  
Gamma Ray ◽  
Lorentz Invariance ◽  
Cosmic Ray ◽  
High Energy ◽  
New Physics ◽  
Galactic Centre ◽  
Astroparticle Physics ◽  
Dark Matter Search ◽  
Physics Program

H.E.S.S. is an array of five Imaging Atmospheric Cherenkov Telescopes located in Namibia. It is designed for observations of astrophysical sources emitting very-high-energy (VHE) gamma rays in the energy range from a few ten GeVs to several ten TeVs. The H.E.S.S. instrument consists of four identical 12 m diameter telescopes and a 28 m diameter telescope placed at the center of the array. An ambitious Astroparticle Physics program is being carried out by the H.E.S.S. collaboration searching for New Physics in the VHE gamma-ray sky. The program includes the search for WIMP dark matter and axion-like particles, tests of Lorentz invariance, cosmic-ray electron measurements, and search for intergalactic magnetic fields. I will present the latest results on dark matter search from the observations of the Galactic Centre region, the search for Lorentz invariance violation with the 2014 flare observation of Markarian 501, and the first measurement of the cosmic-ray electron spectrum up to 20 TeV. The future of the H.E.S.S. Astroparticle Physics program will be discussed.

scholarly journals Latest Results from the Fermi Gamma-Ray Telescope

2014 ◽  
Vol 1 (1) ◽  
pp. 139-145
Author(s):  
Aldo Morselli
Keyword(s):  
Energy Range ◽  
Gamma Rays ◽  
Gamma Ray ◽  
New Physics ◽  
Large Area ◽  
Space Telescope ◽  
Astrophysical Objects

Can we learn about New Physics with astronomical and astro-particle data? Since its launch in 2008, the Large Area Telescope, onboard of the Fermi Gamma-ray Space Telescope, has detected the largest amount of gamma rays in the 20 MeV - 300 GeV energy range and electrons + positrons in the 7 GeV- 1 TeV range, opening a new observational window on a wide variety of astrophysical objects.

scholarly journals Chapter 5 Dark Matter and New Physics Beyond the Standard Model with LHAASO

2021 ◽  
Author(s):  
Xiaojun Bi
Keyword(s):  
Dark Matter ◽  
Standard Model ◽  
Gamma Ray ◽  
Galactic Halo ◽  
Effective Area ◽  
High Energy ◽  
New Physics ◽  
Dark Matter Annihilation ◽  
The Standard Model ◽  
Very High Energy

Abstract In order to reveal the nature of dark matter, it is crucial to detect its non-gravitational interactions with the standard model particles. The traditional dark matter searches focused on the so-called weakly interacting massive particles. However, this paradigm is strongly constrained by the null results of current experiments with high precision. Therefore there is a renewed interest of searches for heavy dark matter particles above TeV scale. The Large High Altitude Air Shower Observatory (LHAASO) with large effective area and strong background rejection power is very suitable to investigate the gamma-ray signals induced by dark matter annihilation or decay above TeV scale. In this document, we review the theoretical motivations and background of heavy dark matter. We review the prospects of searching for the gamma-ray signals resulted from dark matter in the dwarf spheroidal satellites and Galactic halo for LHAASO, and present the projected sensitivities. We also review the prospects of searching for the axion-like particles, which are a kind of well motivated light pseudo-scalars, through the LHAASO measurement of the very high energy gamma-ray spectra of astrophysical sources.

scholarly journals Testing merging of dark exotic stars from gravitational waves in the multi-messenger approach

2018 ◽  
Vol 33 (29) ◽  
pp. 1850167 ◽  
Author(s):  
Andrea Addazi ◽  
Antonino Marciano
Keyword(s):  
Dark Matter ◽  
Neutron Stars ◽  
Gamma Ray ◽  
New Physics ◽  
Dark Matter Halo ◽  
Electromagnetic Signal ◽  
Gamma Ray Burst ◽  
Ordinary Matter ◽  
Spatially Correlated ◽  
Wave Event

We discuss possible implications of the recent detection by the LIGO and VIRGO collaboration of the gravitational-wave event GW170817, the signal of which is consistent with predictions in general relativity on the merging of neutron stars. A near-simultaneous and spatially correlated observation of a gamma-ray burst, the GRB 170817A signal, was achieved independently by the Fermi Gamma-ray Burst Monitor, and by the Anti-coincidence Shield for the Spectrometer of the International Gamma-Ray Astrophysics Laboratory. Motivated by this near temporal and spatial concomitance of events, which can occur by chance only with the probability [Formula: see text], we speculate on the possibility that new dark stars signals could be detected from the LIGO/VIRGO detectors. This proposal, which aims at providing a test for some models of dark matter, relies on the recent achievement of detecting, for visible ordinary matter, the merging of neutron stars both in the gravitational and the electromagnetic channel. A lack of correlation between the two expected signals would suggest a deviation from the properties of ordinary matter. Specifically, we focus on models of invisible dark matter, and in particular we study the case of mirror dark matter, within the framework of which a large amount of mirror neutron stars are naturally envisaged to occupy our dark matter halo. The observation of an electromagnetically hidden event inside the dark matter halo of our galaxy should provide a hint of new physics. There would be indeed no satisfactorily complete explanation accounting for the lack of electromagnetic signal, if only standard neutron star merging were considered to describe events that happen so close to us.

scholarly journals New methods to reconstruct $$X_{\mathrm{max}}$$ and the energy of gamma-ray air showers with high accuracy in large wide-field observatories

2021 ◽  
Vol 81 (1) ◽  
Author(s):  
R. Conceição ◽  
L. Peres ◽  
M. Pimenta ◽  
B. Tomé
Keyword(s):  
Gamma Rays ◽  
Arrival Time ◽  
Gamma Ray ◽  
High Energy ◽  
New Physics ◽  
Wide Field ◽  
Air Showers ◽  
Experimental Conditions ◽  
New Methods ◽  
Wide Field Of View

AbstractNovel methods to reconstruct the slant depth of the maximum of the longitudinal profile ($$X_{\mathrm{max}}$$ X max ) of high-energy showers initiated by gamma-rays as well as their energy ($$E_0$$ E 0 ) are presented. The methods were developed for gamma rays with energies ranging from a few hundred GeV to $$\sim 10$$ ∼ 10 TeV. An estimator of $$X_{\mathrm{max}}$$ X max is obtained, event-by-event, from its correlation with the distribution of the arrival time of the particles at the ground, or the signal at the ground for lower energies. An estimator of $$E_0$$ E 0 is obtained, event-by-event, using a parametrization that has as inputs the total measured energy at the ground, the amount of energy contained in a region near to the shower core and the estimated $$X_{\mathrm{max}}$$ X max . Resolutions about $$40 \, (20)\,\mathrm{g/cm^2}$$ 40 ( 20 ) g / cm 2 and about $$30 \, (20)\%$$ 30 ( 20 ) % for, respectively, $$X_{\mathrm{max}}$$ X max and $$E_0$$ E 0 at $$1 \, (10) \ \mathrm {TeV}$$ 1 ( 10 ) TeV energies are obtained, considering vertical showers. The obtained results are auspicious and can lead to the opening of new physics avenues for large wide field-of-view gamma-ray observatories. The dependence of the resolutions with experimental conditions is discussed.

scholarly journals Gamma-Ray Bursts and New Physics

2006 ◽  
Vol 163 ◽  
pp. 23-37
Author(s):  
Tsvi Piran ◽  
Dafne Guetta ◽  
Maria Rodriguez-Martinez
Keyword(s):  
Gamma Ray ◽  
New Physics ◽  
Gamma Ray Bursts

scholarly journals Fundamental physics with blazar spectra: a critical appraisal

2019 ◽  
Vol 491 (4) ◽  
pp. 5268-5276 ◽  
Author(s):  
Giorgio Galanti ◽  
Fabrizio Tavecchio ◽  
Marco Landoni
Keyword(s):  
Gamma Ray ◽  
Lorentz Invariance ◽  
Spectral Energy Distribution ◽  
High Energy ◽  
New Physics ◽  
Spectral Energy ◽  
Bl Lac ◽  
Very High Energy ◽  
Emission Models ◽  
Hadron Beam

ABSTRACT Very-high-energy (VHE) BL Lacertae (BL Lac) spectra extending above $10 \, \rm TeV$ provide a unique opportunity for testing physics beyond the standard model of elementary particle and alternative blazar emission models. We consider the hadron beam scenario, the conversion of photons to axion-like particles (ALPs) and the Lorentz invariance violation (LIV) by analysing their consequences and induced modifications to BL Lac spectra. In particular, we consider how different processes can provide similar spectral features (e.g. hard tails) and we discuss the ways they can be disentangled. We use data from High-Energy Gamma-Ray Astronomy (HEGRA) of a high state of Markarian 501 and the High-Energy Stereoscopic System (H.E.S.S.) spectrum of the extreme BL Lac (EHBL) 1ES 0229+200. In addition, we consider two hypothetical EHBLs similar to 1ES 0229+200 located at redshifts z = 0.3 and z = 0.5. We observe that both the hadron beam and the photon–ALP oscillations predict a hard tail extending to energies larger than those possible in the standard scenario. Photon–ALP interaction predicts a peak in the spectra of distant BL Lacs at about $20\rm {-}30 \, \rm TeV$, while LIV produces a strong peak in all BL Lac spectra around $\sim 100 \, \rm TeV$. The peculiar feature of the photon–ALP conversion model is the production of oscillations in the spectral energy distribution, so that its detection/absence can be exploited to distinguish between the considered models. The above-mentioned features of the three models might be detected by the upcoming Cherenkov Telescope Array. Thus, future observations of BL Lac spectra could eventually shed light on new physics and alternative blazar emission models, driving fundamental research towards a specific direction.

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