Article
Astronomy & Astrophysics
Pedro De La Torre Luque
Summary: Recent cosmic-ray studies have suggested a possible excess in the antiproton flux around 10 GeV, potentially related to dark matter, but with significant uncertainties. Through a Markov-Chain Monte Carlo analysis, researchers evaluated the origin of the excess and found a proton ratio matching AMS-02 data, with a remaining constant excess of around 10%.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
R. U. Abbasi, M. Abe, T. Abu-Zayyad, M. Allen, Y. Arai, E. Barcikowski, J. W. Belz, D. R. Bergman, S. A. Blake, R. Cady, B. G. Cheon, J. Chiba, M. Chikawa, T. Fujii, K. Fujisue, K. Fujita, R. Fujiwara, M. Fukushima, R. Fukushima, G. Furlich, W. Hanlon, M. Hayashi, N. Hayashida, K. Hibino, R. Higuchi, K. Honda, D. Ikeda, T. Inadomi, N. Inoue, T. Ishii, H. Ito, D. Ivanov, H. Iwakura, H. M. Jeong, S. Jeong, C. C. H. Jui, K. Kadota, F. Kakimoto, O. Kalashev, K. Kasahara, S. Kasami, H. Kawai, S. Kawakami, S. Kawana, K. Kawata, E. Kido, H. B. Kim, J. H. Kim, M. H. Kim, S. W. Kim, Y. Kimura, S. Kishigami, V. Kuzmin, M. Kuznetsov, Y. J. Kwon, K. H. Lee, B. Lubsandorzhiev, J. P. Lundquist, K. Machida, H. Matsumiya, T. Matsuyama, J. N. Matthews, R. Mayta, M. Minamino, K. Mukai, I. Myers, S. Nagataki, K. Nakai, R. Nakamura, T. Nakamura, Y. Nakamura, T. Nonaka, H. Oda, S. Ogio, M. Ohnishi, H. Ohoka, Y. Oku, T. Okuda, Y. Omura, M. Ono, R. Onogi, A. Oshima, S. Ozawa, I. H. Park, M. S. Pshirkov, J. Remington, D. C. Rodriguez, G. I. Rubtsov, D. Ryu, H. Sagawa, R. Sahara, Y. Saito, N. Sakaki, T. Sako, N. Sakurai, K. Sano, K. Sato, T. Seki, K. Sekino, P. D. Shah, F. Shibata, N. Shibata, T. Shibata, H. Shimodaira, B. K. Shin, H. S. Shin, D. Shinto, J. D. Smith, P. Sokolsky, N. Sone, B. T. Stokes, T. A. Stroman, T. Suzawa, Y. Takagi, Y. Takahashi, M. Takamura, M. Takeda, R. Takeishi, A. Taketa, M. Takita, Y. Tameda, H. Tanaka, K. Tanaka, M. Tanaka, Y. Tanoue, S. B. Thomas, G. B. Thomson, P. Tinyakov, I. Tkachev, H. Tokuno, T. Tomida, S. Troitsky, R. Tsuda, Y. Tsunesada, Y. Uchihori, S. Udo, T. Uehama, F. Urban, T. Wong, K. Yada, M. Yamamoto, K. Yamazaki, J. Yang, K. Yashiro, F. Yoshida, Y. Zhezher, Z. Zundel
Summary: This paper reports results on the measurement of the cosmic-ray composition using the TALE air fluorescence detector, focusing on X-max distributions of showers observed over a wide energy range. The study shows that the composition of cosmic rays becomes heavier with increasing energy, consistent with a rigidity-dependent cutoff of events from Galactic sources. Additionally, a change in the cosmic-ray composition is observed at energies just above 10(17) eV.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
Sandipan Sengupta
Summary: This paper presents a Hamiltonian theory of gravity for noninvertible tetrad fields, which exhibit three local degrees of freedom. The formulation here provides a Hamiltonian basis to analyze gravity theory around a physical singularity.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
P. De La Torre Luque, M. N. Mazziotta, F. Loparco, F. Gargano, D. Serini
Summary: Advancements in cosmic-ray flux measurements have been made possible by new experiments and the AMS-02 mission. Using the upcoming DRAGON2 code, researchers studied the impact of cross section uncertainties on light secondary nuclei fluxes, finding that these uncertainties can explain discrepancies in Li and Be fluxes compared to AMS-02 data. Further analysis also provided insights into improving cross section parameterizations for better consistency.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
P. De la Torre Luque, M. N. Mazziotta, F. Loparco, F. Gargano, D. Serini
Summary: Recent work challenges current models of cosmic-ray propagation in the Galaxy by analyzing secondary cosmic rays flux ratios. Results suggest that Li ratios favor a harder spectral index of the diffusion coefficient, while remaining compatible with observed uncertainties.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Review
Physics, Multidisciplinary
M. Aguilar, L. Ali Cavasonza, G. Ambrosi, L. Arruda, N. Attig, F. Barao, L. Barrin, A. Bartoloni, S. Basegmez-du Pree, J. Bates, R. Battiston, M. Behlmann, B. Beischer, J. Berdugo, B. Bertucci, V Bindi, W. de Boer, K. Bollweg, B. Borgia, Mj Boschini, M. Bourquin, E. F. Bueno, J. Burger, W. J. Burger, S. Burmeister, X. D. Cai, M. Capell, J. Casaus, G. Castellini, F. Cervelli, Y. H. Chang, G. M. Chen, H. S. Chen, Y. Chen, L. Cheng, H. Y. Chou, S. Chouridou, V Choutko, C. H. Chung, C. Clark, G. Coignet, C. Consolandi, A. Contin, C. Corti, Z. Cui, K. Dadzie, Y. M. Dai, C. Delgado, S. Della Torre, M. B. Demirkoz, L. Derome, S. Di Falco, V Di Felice, C. Diaz, F. Dimiccoli, P. von Doetinchem, F. Dong, F. Donnini, M. Duranti, A. Egorov, A. Eline, J. Feng, E. Fiandrini, P. Fisher, V Formato, C. Freeman, Y. Galaktionov, C. Gamez, R. J. Garcia-Lopez, C. Gargiulo, H. Gast, I Gebauer, M. Gervasi, F. Giovacchini, D. M. Gomez-Coral, J. Gong, C. Goy, V Grabski, D. Grandi, M. Graziani, K. H. Guo, S. Haino, K. C. Han, R. K. Hashmani, Z. H. He, B. Heber, T. H. Hsieh, J. Y. Hu, Z. C. Huang, W. Hungerford, M. Incagli, W. Y. Jang, Yi Jia, H. Jinchi, K. Kanishev, B. Khiali, G. N. Kim, Th Kirn, M. Konyushikhin, O. Kounina, A. Kounine, V Koutsenko, A. Kuhlman, A. Kulemzin, G. La Vacca, E. Laudi, G. Laurenti, I Lazzizzera, A. Lebedev, H. T. Lee, S. C. Lee, C. Leluc, J. Q. Li, M. Li, Q. Li, S. Li, T. X. Li, Z. H. Li, C. Light, C. H. Lin, T. Lippert, Z. Liu, S. Q. Lu, Y. S. Lu, K. Luebelsmeyer, J. Z. Luo, S. S. Lyu, F. Machate, C. Mana, J. Marin, J. Marquardt, T. Martin, G. Martinez, N. Masi, D. Maurin, A. Menchaca-Rocha, Q. Meng, D. C. Mo, M. Molero, P. Mott, L. Mussolin, J. Q. Ni, N. Nikonov, F. Nozzoli, A. Oliva, M. Orcinha, M. Palermo, F. Palmonari, M. Paniccia, A. Pashnin, M. Pauluzzi, S. Pensotti, H. D. Phan, V Plyaskin, M. Pohl, S. Porter, X. M. Qi, X. Qin, Z. Y. Qu, L. Quadrani, P. G. Rancoita, D. Rapin, A. Reina Conde, S. Rosier-Lees, A. Rozhkov, D. Rozza, R. Sagdeev, S. Schael, S. M. Schmidt, A. Schulz von Dratzig, G. Schwering, E. S. Seo, B. S. Shan, J. Y. Shi, T. Siedenburg, C. Solano, J. W. Song, R. Sonnabend, Q. Sun, Z. T. Sun, M. Tacconi, X. W. Tang, Z. C. Tang, J. Tian, Samuel C. C. Ting, S. M. Ting, N. Tomassetti, J. Torsti, C. Tuysuz, T. Urban, I Usoskin, V. Vagelli, R. Vainio, E. Valente, E. Valtonen, M. Vazquez Acosta, M. Vecchi, M. Velasco, J. P. Vialle, L. Q. Wang, N. H. Wang, Q. L. Wang, S. Wang, X. Wang, Z. X. Wang, J. Wei, Z. L. Weng, H. Wu, R. Q. Xiong, W. Xu, Q. Yan, Y. Yang, H. Yi, Y. J. Yu, Z. Q. Yu, M. Zannoni, C. Zhang, F. Zhang, F. Z. Zhang, J. H. Zhang, Z. Zhang, F. Zhao, Z. M. Zheng, H. L. Zhuang, V Zhukov, A. Zichichi, N. Zimmermann, P. Zuccon
Summary: The Alpha Magnetic Spectrometer (AMS) is a precision particle physics detector on the International Space Station conducting fundamental physics research in space. The latest results based on 120 billion charged cosmic ray events up to multiTeV energies have provided unexpected information and unique insights into the origins and propagation of cosmic rays.
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS
(2021)
Article
Astronomy & Astrophysics
I. Briki, M. Mazouz, L. Ghedira
Summary: We report measurements of the angular distributions of low momentum atmospheric muons at 38 m above sea level for zenith angles between -60 and 60 degrees in the south-north direction. The muon detection was performed using two NaI(Tl) scintillation detectors mounted in coincidence. The integrated and differential muon flux were determined by analyzing the deposited energy spectra in the scintillators backed up by a Geant4 simulation of the experimental setup. The results are consistent with the cosn(0) distribution and fill the gap in the geomagnetic cutoff rigidity interval 8 GV < Pc < 14 GV where no similar measurements were performed before. We found that n = 1.88 - 0.12 P mu c in the domain of muon momentum cutoff P mu c < 1 GeV/c. These measurements are useful for muon studies requiring accurate integrated flux.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Julien Manshanden, Guenter Sigl, Maria V. Garzelli
Summary: By investigating the fireball model, we find that only enhancing the strangeness in Standard Model hadronic interactions can solve the muon puzzle. The current accessible energies have already verified this strangeness enhancement, corresponding to a 5-9% increase in the average energy retained in the hadronic cascade compared to predictions from current models.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Noemie Globus, Anatoli Fedynitch, Roger D. Blandford
Summary: This article explores the potential mechanism of cosmic radiation on the emergence of biological homochirality, emphasizing the impact of parity violation in weak interactions on polarization transport in cosmic ray showers. The study shows that muons retain their polarization even at energies that can initiate mutagenesis, potentially establishing a connection between broken symmetries in the standard model of particle physics and living organisms. The research calculates radiation doses from primary and secondary cosmic rays at various targets in the solar system and discusses implications for enantioselective mutagenesis as a driver of homochiralization.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
Andrius Tamosiunas, Chad Briddon, Clare Burrage, Alan Cutforth, Adam Moss, Thomas Vincent
Summary: A key goal in cosmology is to better understand the accelerated expansion of the Universe. This study focuses on the chameleon screening phenomenon in cosmic voids and uses analytical and numerical methods to investigate its impact on structure formation. The results show a complex relationship between the properties of cosmic voids and the chameleon acceleration of test particles. The study also discusses the optimal density profiles for detecting the fifth force in upcoming observational surveys.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
George Lazarides, Rinku Maji, Qaisar Shafi
Summary: Investigated the impact of Coleman-Weinberg inflation on the stochastic gravity wave background spectrum emitted by intermediate-scale cosmic strings, finding it can help satisfy the PPTA bound. Explored the formation of strings, modified gravity wave spectra, and the results in different scenarios.
Article
Astronomy & Astrophysics
Rita C. dos Anjos, Jaziel G. Coelho, Jonas P. Pereira, Fernando Catalani
Summary: This paper investigates the contribution of cosmic-ray acceleration from SNR G57.2+0.8 hosting SGR J1935+2154 to the high-energy and very high-energy gamma-ray emission using the GALPROP code. The study also discusses the potential for a more comprehensive scenario for the generation of GeV-TeV gamma-rays in the context of the SNR + SGR association.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Physics, Particles & Fields
Petr Satunin
Summary: Based on recent gamma ray observations by the Tibet-AS gamma and LHAASO experiments, we present new constraints on the Lorentz Invariance violation energy scale for photons with quartic dispersion relation. The constraints in the subluminal scenario outperform pair production constraints and are the strongest in existing literature.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Engineering, Aerospace
Ramanath Cowsik, Dawson Huth
Summary: We use a phenomenological approach in a minimal model to study the spectral intensity of secondary cosmic-ray particles such as positrons, antiprotons, Lithium, Beryllium, and Boron. Our analysis shows that at GeV energies, cosmic rays traverse a significant amount of matter in the regions surrounding their sources. This amount decreases with increasing cosmic-ray energy and becomes negligible beyond 100 GeV. In the interstellar medium, cosmic rays of all energies up to 105 GeV/n pass through approximately 1-2 g/cm2 of matter before entering the intergalactic medium. The bulk of positrons and antiprotons are generated in the interstellar medium. Additionally, cosmic-ray nuclei like C, N, and O produce additional amounts of Li, Be, and B nuclei with spectra similar to those of C, O, etc. The implications of these minimal model findings for gamma-ray observations and the importance of spatial and temporal discreteness of cosmic-ray sources for modeling cosmic-ray propagation are briefly discussed.
ADVANCES IN SPACE RESEARCH
(2022)
Article
Physics, Nuclear
Jia-Shu Niu
Summary: This study uses a broken power law to fit the spectra of cosmic ray nuclei from AMS-02, revealing complicated relationships among different nuclear species that can be explained by the superposition of different kinds of sources. Future experiments, such as DAMPE, will provide opportunities for cross verification and further investigation into the properties of different sources.
