1. Education, Outreach and Public Relations of the Pierre Auger Observatorymarko zavrtanik, Danilo Zavrtanik, Lili Yang, Serguei Vorobiov, Darko Veberič, Marta Trini, Samo Stanič, Ahmed Saleh, Gašper Kukec Mezek, Andrej Filipčič, Charles Timmermans, 2015, published scientific conference contribution Abstract: The scale and scope of the physics studied at the Pierre Auger
Observatory continue to offer significant opportunities for
original outreach work. Education, outreach and public
relations of the Auger Collaboration are coordinated in a
dedicated task whose goals are to encourage and support
a wide range of efforts that link schools and the public with
the Auger scientists and the science of cosmic rays, particle
physics, and associated technologies. We focus on the impact of
the Collaboration in Mendoza Province, Argentina and beyond.
The Auger Visitor Center in Malargüe has hosted over 95,000
visitors since 2001, and a fifth Collaboration-sponsored
science fair was held on the Observatory campus in November
2014. The Rural Schools Program, which is run by Observatory
staff and which brings cosmic-ray science and infrastructure
improvements to remote schools, continues to broaden its
reach. Numerous online resources, video documentaries, and
animations of extensive air showers have been created for wide
public release. Increasingly, collaborators draw on these
resources to develop Auger related displays and outreach events
at their institutions and in public settings to disseminate the
science and successes of the Observatory worldwide. We also
highlight education and outreach activities associated with the
planned upgrade of the Observatory’s detector systems and
future physics goals.
Found in: ključnih besedah
Summary of found: ...The scale and scope of the physics studied at the Pierre Auger
Observatory continue to...
Keywords: Pierre Auger Observatory, cosmic rays physics, education, outreach, public relations
Published: 03.03.2016; Views: 3774; Downloads: 176
 Fulltext (4,12 MB) |
2. Prospects On Testing Lorentz Invariance Violation With The Cherenkov Telescope Arraymarko zavrtanik, Danilo Zavrtanik, Gabrijela Zaharijas, Lili Yang, Serguei Vorobiov, Samo Stanič, Gašper Kukec Mezek, Andrej Filipčič, M. K. Daniel, 2015, published scientific conference contribution Found in: ključnih besedah
Summary of found: ...Invariance Violation (LIV),
Very High Energy (VHE) gamma-rays,
fundamental physics probes,
Active Galactic Nuclei (AGN),
Gamma Ray Bursts...
Keywords: Cherenkov Telescope Array (CTA), Lorentz Invariance Violation (LIV), Very High Energy (VHE) gamma-rays, fundamental physics probes, Active Galactic Nuclei (AGN), Gamma Ray Bursts (GRBs), pulsars
Published: 14.03.2016; Views: 3730; Downloads: 212
Fulltext (904,49 KB) |
3. Search for UHE neutrinos – in coincidence with LIGO GW150914 event – with the Pierre Auger ObservatoryLili Yang, 2016, published scientific conference contribution abstract Abstract: The first gravitational wave transient GW150914 was observed by Advanced LIGO on September 14th, 2015 at 09:50:45 Universal Time. In addition to follow-up electromagnetic observations, the detection of neutrinos will probe deeply and more on the nature of astrophysical sources, especially in the ultra-high energy regime. Neutrinos in the EeV energy range were searched in data collected at the surface detector of the Pierre Auger Observatory within ± 500 s and 1 day after the GW150914 event. No neutrino candidates were found. Based on this non-observation, we derive the first and only one neutrino fluence upper limit at EeV energies for this event at 90% CL, and report constraints on existence of accretion disk around mergers.
Found in: ključnih besedah
Keywords: gravitational waves, neutrinos, black hole physics
Published: 06.12.2016; Views: 4249; Downloads: 0
Fulltext (627,39 KB) |
4. Indirect Detection ExperimentsGabrijela Zaharijas, 2017, published scientific conference contribution abstract (invited lecture) Found in: ključnih besedah
Summary of found: ...live in a golden age for astro-particle physics, with a significant number of experiments actively...
Keywords: 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.
Published: 17.07.2017; Views: 3992; Downloads: 0
Fulltext (50,35 MB) |
5. Search for Physics beyond the Standard Model with the CRESST Experiment2017, master's thesis Abstract: 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).
Found in: ključnih besedah
Keywords: 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
Published: 13.10.2017; Views: 3635; Downloads: 0
Fulltext (10,71 MB) |
6. SIFTING FOR SAPPHIRES: SYSTEMATIC SELECTION OF TIDAL DISRUPTION EVENTS IN iPTFTiara Hung, Suvi Gezari, Tanja Petrushevska, 2018, original scientific article Abstract: We present results from a systematic selection of tidal disruption events (TDEs) in a wide area (4800
deg2
) g + R band experiment by the Intermediate Palomar Transient Factory (iPTF) with a rolling
cadence of 1 and 3 days. We use photometric selection criteria to down select from a total of 493
nuclear transients detected during the experiment to a sample of 26 blue (g − r < 0 mag) nuclear
transients in red host galaxies. Using Swift follow-up UV and X-ray imaging, and ground-based
optical spectroscopy, we classify 14 Type Ia supernovae (SNe Ia), 9 highly variable active galactic
nuclei (AGNs), 2 confirmed TDEs, and 1 potential core-collapse supernova. From our study, we
measure a TDE per galaxy rate of 1.7 +2.85
−1.27 ×10−4 gal−1 yr−1
(90% CL in Poisson statistics) using a
galaxy number density estimated from the SDSS luminosity function. We find that it is possible to
filter out AGNs by employing a more stringent transient color cut (g − r < −0.2 mag). The UV is an
important discriminator for filtering out SN contamination, since in the optical, SNe Ia can appear as
blue as TDEs in their early phases. However, the contamination from SN Ia drops significantly with a
more stringent spatial offset cut, suggesting higher precision in astrometry is essential for separating
TDEs from SNe Ia in the optical. Our most stringent optical photometric selection criteria yields
a contamination rate of 4.5:1, allowing for a manageable number of TDE candidates for complete
spectroscopic follow-up and real-time classification in the ZTF era.
Found in: ključnih besedah
Summary of found: ...accretion, accretion disks – black hole physics – galaxies: nuclei – ultraviolet: general...
Keywords: accretion, accretion disks – black hole physics – galaxies: nuclei – ultraviolet: general
Published: 02.03.2022; Views: 776; Downloads: 46
Fulltext (1,18 MB) |
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8. An Indication of Anisotropy in Arrival Directions of Ultra-high-energy Cosmic Rays through Comparison to the Flux Pattern of Extragalactic Gamma-Ray SourcesMarko Zavrtanik, Danilo Zavrtanik, Lili Yang, Serguei Vorobiov, Darko Veberič, Marta Trini, Samo Stanič, Ahmed Saleh, Gašper Kukec Mezek, Andrej Filipčič, A. Aab, 2018, original scientific article Found in: ključnih besedah
Summary of found: ...astroparticle physics, cosmic rays, active galaxies, starburst galaxies, data...
Keywords: astroparticle physics, cosmic rays, active galaxies, starburst galaxies, data analysis methods
Published: 14.02.2018; Views: 2719; Downloads: 0
Fulltext (2,83 MB) |
9. The Pierre Auger Observatory UpgradeDaniele Martello, Andrej Filipčič, Gašper Kukec Mezek, Ahmed Saleh, Samo Stanič, Marta Trini, Darko Veberič, Serguei Vorobiov, Lili Yang, Danilo Zavrtanik, Marko Zavrtanik, 2017, published scientific conference contribution Found in: ključnih besedah
Summary of found: ...Pierre Auger Observatory, AugerPrime, improved physics sensitivity...
Keywords: Pierre Auger Observatory, AugerPrime, improved physics sensitivity
Published: 19.02.2018; Views: 2501; Downloads: 138
Fulltext (2,79 MB) |
10. Energy enhancement of the target surface electron by using a 200 TW sub-picosecond laserJ. Y. Mao, 2018, original scientific article Abstract: One order of magnitude energy enhancement of the target surface electron beams with central energy at 11.5 MeV is achieved by using a 200 TW, 500 fs laser at an incident angle of 72° with a prepulse intensity ratio of 5×10−6. The experimental results demonstrate the scalability of the acceleration process to high electron energy with a longer (sub-picosecond) laser pulse duration and a higher laser energy (120 J). The total charge of the beam is 400±20 pC(
Found in: ključnih besedah
Summary of found: ...Strong field laser physics, Plasmas, Particles, Femtosecond phenomena, Surface dynamics....
Keywords: Strong field laser physics, Plasmas, Particles, Femtosecond phenomena, Surface dynamics.
Published: 07.08.2018; Views: 3458; Downloads: 0
Fulltext (421,81 KB) |
