61. Auger HighlightsMarko Zavrtanik, Danilo Zavrtanik, Darko Veberič, Samo Stanič, Andrej Filipčič, Antonella Castellina, Gašper Kukec Mezek, Ahmed Saleh, Marta Trini, Serguei Vorobiov, Lili Yang, 2014, objavljeni znanstveni prispevek na konferenci Najdeno v: ključnih besedah Povzetek najdenega: ...Pierre Auger Observatory,
ultra high energy cosmic rays (UHECR),
UHECR hybrid detection technique,
UHECR energy... Ključne besede: Pierre Auger Observatory, ultra high energy cosmic rays (UHECR), UHECR hybrid detection technique, UHECR energy spectrum, UHECR mass composition, UHECR arrival directions Objavljeno: 20.06.2017; Ogledov: 3192; Prenosov: 295
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62. Astroparticles at the High Energy Frontier: Results from the Pierre Auger ObservatoryMarko Zavrtanik, Danilo Zavrtanik, Serguei Vorobiov, Darko Veberič, Samo Stanič, Ahmed Saleh, Andrej Filipčič, Gonzalo Parente, 2014, objavljeni znanstveni prispevek na konferenci Najdeno v: ključnih besedah Ključne besede: Pierre Auger Observatory, ultra-high energy cosmic rays (UHECR), UHECR energy spectrum, mass composition, anisotropies Objavljeno: 20.06.2017; Ogledov: 3152; Prenosov: 0
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63. Multi-resolution anisotropy studies of ultrahigh-energy cosmic rays detected at the Pierre Auger ObservatoryMarko Zavrtanik, Danilo Zavrtanik, Lili Yang, Serguei Vorobiov, Darko Veberič, Marta Trini, Samo Stanič, Ahmed Saleh, Gašper Kukec Mezek, Andrej Filipčič, A. Aab, 2017, izvirni znanstveni članek Najdeno v: ključnih besedah Ključne besede: Pierre Auger Observatory, ultra-high energy cosmic rays (UHECR), UHECR anisotropies, angular power spectrum, needlet wavelet analysis Objavljeno: 23.06.2017; Ogledov: 2831; Prenosov: 0
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64. Results from the Pierre Auger ObservatoryMarko Zavrtanik, Danilo Zavrtanik, Darko Veberič, Samo Stanič, Andrej Filipčič, Ivan De Mitri, 2015, objavljeni znanstveni prispevek na konferenci Najdeno v: ključnih besedah Povzetek najdenega: ...Pierre Auger Observatory,
Ultra High Energy Cosmic Rays (UHECR),
UHECR energy spectrum, UHECR mass... Ključne besede: Pierre Auger Observatory, Ultra High Energy Cosmic Rays (UHECR), UHECR energy spectrum, UHECR mass composition Objavljeno: 27.06.2017; Ogledov: 2712; Prenosov: 0
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65. Indirect Detection ExperimentsGabrijela Zaharijas, 2017, objavljeni povzetek znanstvenega prispevka na konferenci (vabljeno predavanje) Najdeno v: ključnih besedah Povzetek najdenega: ...a significant number of experiments actively monitoring high- energy Universe. Many of these probes provide excellent... Ključne besede: We live in a golden age for astro-particle physics, with a significant number of experiments actively monitoring high-energy Universe. Many of these probes provide excellent tests of particle physics models of dark matter particles. In particular, experiments such as Fermi -LAT, AMS-02, Ice Cube, ... are significantly cutting into the parameter space of one of the most popular candidates, the WIMPs. In this talk I will describe some of the strategies and methods used to search for dark matter with astrophysical data. Special attention will be given to the latest indications of an unaccounted gamma-ray excess at few GeV in the Fermi-LAT data in the region around the Galactic Centre, which steered lots of attention as it was shown to be consistent with putative signals of WIMP dark matter particles and complementary constraints provided by other experiments. Finally I will discuss projections of the expected sensitivities with upcoming experiments and continued data taking with current ones. Objavljeno: 17.07.2017; Ogledov: 3394; Prenosov: 0
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66. Search for Physics beyond the Standard Model with the CRESST Experiment2017, magistrsko delo Opis: In spite of the successes of observational astro- and particle physics and cosmology very much of the universe remains unknown. The Standard Model of particle physics is a theory describing the electromagnetic, weak, and strong nuclear interactions, as well as classifying all the subatomic particles known. But there is overwhelming evidence, that all the known particles, the ordinary (baryonic) matter, the building blocks of planets, stars and ourselves, only make up about 4.9% of the energy content of the universe. The standard model of cosmology (CDM) indicates that the total mass-energy of the universe contains beside the 4.9% ordinary matter two other components: 26.8% dark matter and 68.3% dark energy. The accelerating expansion of the Universe is the result of the effect of the dark energy with its most simple form given by a cosmological constant in Einstein's Equation. Dark matter is an unidentified type of matter that is not accounted for by dark energy and neutrinos and is generally believed to be a non-relativistic, charge neutral and non-baryonic new form of matter. Although dark matter has not been directly observed yet, its existence and properties are inferred from its gravitational effects such as the motions of visible matter, gravitational lensing, its influence on the universe's large-scale structure, and its effects in the cosmic microwave background. Thus the search for Dark Matter is the search for physics beyond the standard model. Although the nature of dark matter is yet unknown, its presence is crucial to understanding the future of the universe. The CRESST experiment is searching for direct evidence in the form of a nuclear recoil induced on a scintillating CaWO4 crystal by a dark matter particle, and is installed and taking data underground at Laboratory Nazionali del Gran Sasso (LNGS) in Italy. While both, dark energy and dark matter, have not been detected directly, a class of dark matter particles that interact only via gravity and the weak force, referred to asWeakly Interacting Massive Particles (WIMPs), has been established as the leading candidate among the dark matter community. For this thesis a special model of dark matter was studied, namely the dark photon. This thesis provides a detailed description of the calculation of the 90% upper limit on the dark photon kinetic mixing based on data from the second phase of the CRESST experiment. The analysis was carried out in a frequentist approach based on the (unbinned) maximum-likelihood method and likelihood ratios. To make a statement about the calculated result and its quality, the used algorithm had to be tested, what was done with Monte Carlo simulations (pseudo data). Najdeno v: ključnih besedah Povzetek najdenega: ...only make up about 4.9% of the energy content of the universe. The standard model... Ključne besede: astro physics, particle physics, cosmology, universe, Standard Model of particle physics, standard model of cosmology, matter, ordinary matter, dark matter, dark energy, accelerating expansion of the Universe, non-baryonic, new form of matter, gravitational lensing, cosmic microwave background, search for physics beyond the standard model, CRESST experiment, direct detection, CaWO4 crystal, underground laboratory, Laboratory Nazionali del Gran Sasso, Weakly Interacting Massive Particles, WIMP, dark photon, 90% upper limit, upper limit, kinetic mixing, frequentist approach, unbinned, maximum likelihood Objavljeno: 13.10.2017; Ogledov: 3013; Prenosov: 0
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67. Astroparticle studies at the Pierre Auger ObservatoryLili Yang, predavanje na tuji univerzi Opis: The Pierre Auger Observatory (PAO), the world’s largest cosmic ray detector combines a large surface detector (SD) with an air fluorescence detector (FD). It is designed to observe extensive air showers (EAS) of billions of secondary particles induced by the UHECRs in the earths’ atmosphere. The “hybrid” design (i.e., detected simultaneously by SD and FD) provides wealth of information about shower development and excellent event reconstruction. Together with observations of UHECRs, the Surface Detector (SD) of the PAO is sensitive to UHE neutrinos through the observation of deeply initiated inclined down-going showers produced by neutrino interactions in the atmosphere, which method has been well established. On the other hand, high-energy photons can also be discriminated from background of charged cosmic rays based on their characters of the shower front. In this talk, I will give a review on recent results from PAO and introduce the ultra-high energy multi-messenger studies from PAO. Najdeno v: ključnih besedah Povzetek najdenega: ...been well established. On the other hand, high- energy photons can also be discriminated from background... Ključne besede: Pierre Auger Observatory, cosmic rays, ultra-high energy Objavljeno: 17.01.2018; Ogledov: 2353; Prenosov: 0
Polno besedilo (8,86 MB) Gradivo ima več datotek! Več...
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68. Supernova remnants in the very-high-energy sky: prospects for the Cherenkov Telescope ArrayMarko Zavrtanik, Danilo Zavrtanik, Gabrijela Zaharijas, Lili Yang, Serguei Vorobiov, Samo Stanič, Gašper Kukec Mezek, Christopher Eckner, P. Cristofari, 2017, objavljeni znanstveni prispevek na konferenci Najdeno v: ključnih besedah Ključne besede: supernova remnants, CTA, very-high-energy Objavljeno: 16.02.2018; Ogledov: 2089; Prenosov: 139
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69. Extragalactic source population studies at very high energies in the Cherenkov Telescope Array eraMarko Zavrtanik, Danilo Zavrtanik, Gabrijela Zaharijas, Lili Yang, Serguei Vorobiov, Samo Stanič, Gašper Kukec Mezek, Christopher Eckner, T. Hassan, 2017, objavljeni znanstveni prispevek na konferenci Najdeno v: ključnih besedah Povzetek najdenega: ...very high energy,
CTA,
extragalactic source... Ključne besede: very high energy, CTA, extragalactic source Objavljeno: 16.02.2018; Ogledov: 2238; Prenosov: 109
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70. A Compact High Energy Camera (CHEC) for the Gamma-ray Cherenkov Telescope of the Cherenkov Telescope ArrayMarko Zavrtanik, Danilo Zavrtanik, Gabrijela Zaharijas, Lili Yang, Serguei Vorobiov, Samo Stanič, Gašper Kukec Mezek, Christopher Eckner, R. White, 2017, objavljeni znanstveni prispevek na konferenci Najdeno v: ključnih besedah Ključne besede: Compact High Energy Camera, CTA, Gamma-ray Cherenkov Telescope Objavljeno: 16.02.2018; Ogledov: 1913; Prenosov: 75
Polno besedilo (6,76 MB) |