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X-ORIGINAL-URL:https://ecap.nat.fau.de
X-WR-CALDESC:Events for Erlangen Centre for Astroparticle Physics
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DTSTART:20230326T010000
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DTSTART;TZID=Europe/Berlin:20231116T130000
DTEND;TZID=Europe/Berlin:20231116T140000
DTSTAMP:20260417T154904
CREATED:20231017T124139Z
LAST-MODIFIED:20231116T170957Z
UID:4800-1700139600-1700143200@ecap.nat.fau.de
SUMMARY:ECAP Seminar: Denys Malyshev
DESCRIPTION:Search for primordial black hole dark matter with X-ray satellites and prospects for future missions\nUltralight primordial black holes (PBHs) in the mass range of 1016 – 1022 g are allowed by current observations to constitute a significant fraction\, if not all\, of the dark matter in the Universe. In this work\, we present limits on ultralight\, nonrotating PBHs which arise from the nondetection of the Hawking radiation signals from such objects in the keV – MeV energy band. Namely\, we consider observations from the current-generation missions XMM-Newton and INTEGRAL/SPI and discuss the observational perspectives of the future missions Athena\, eXTP\, and THESEUS for PBH searches. Based on 3.4 Msec total exposure time of XMM-Newton observations of Draco dwarf spheroidal galaxy\, we conclude that PBH with masses ≲ 1016 g cannot make all dark matter at 95% confidence level. Our ON-OFF-type analysis of >100 Msec of INTEGRAL/SPI data on the Milky Way halo puts significantly stronger constraints. Only ≲ 10 % of dark matter can be presented by PBHs with masses ≲ 3 × 1016 g while the majority of dark matter cannot be represented by PBHs lighter than 7 × 1016 g at 95% confidence level. We discuss the strong impact of systematic uncertainty related to the variations of instrumental and astrophysical INTEGRAL/SPI background on the derived results and estimate its level. We also show that future large field-of-view missions such as THESEUS /X-GIS will be able to improve the constraints by a factor of 10 – 100 depending on the level of control of the systematics of these instruments. \nDownload talk slides
URL:https://ecap.nat.fau.de/index.php/event/ecap-seminar-2023-11-16-denys-malyshev/
LOCATION:Zoom
CATEGORIES:Seminar
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DTSTART;TZID=Europe/Berlin:20231123T130000
DTEND;TZID=Europe/Berlin:20231123T140000
DTSTAMP:20260417T154904
CREATED:20231017T124140Z
LAST-MODIFIED:20231117T105916Z
UID:4801-1700744400-1700748000@ecap.nat.fau.de
SUMMARY:ECAP Seminar: Esra Bulbul
DESCRIPTION:First Results from the eROSITA All-Sky Survey: An Open Window to Precision Cosmology\nClusters of galaxies trace the highest peaks in the cosmic density field and offer an independent and powerful probe of the growth of structure and cosmology. Locating clusters through well-planned multi-wavelength surveys is crucial for testing gravitational theory and cosmology. Successfully launched in July 2019\, eROSITA\, the German-built telescope array operating between 0.2-8 keV on board the Russian-German Spectrum-RG (SRG) mission\, delivers the largest catalogs of clusters of galaxies from its All-Sky Surveys. The first eROSITA all-sky survey\, yielding more than 10\,000 confirmed clusters of galaxies\, constrains the cosmological parameters from cluster mass function and cluster-clustering when combined with the overlapping DES\, HSC\, and KIDS weak lensing surveys. I will summarise the first cluster science\, large scale structure\, and cosmology results from eROSITA’s first All-Sky Survey and provide an outlook for future deeper surveys.
URL:https://ecap.nat.fau.de/index.php/event/ecap-seminar-2023-11-23-esra-bulbul/
LOCATION:ECAP Laboratory\, 00.061\, Nikolaus-Fiebiger-Str. 2\, Erlangen\, 91058\, Germany
CATEGORIES:Seminar
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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20231130T130000
DTEND;TZID=Europe/Berlin:20231130T140000
DTSTAMP:20260417T154904
CREATED:20231017T124140Z
LAST-MODIFIED:20231116T161738Z
UID:4802-1701349200-1701352800@ecap.nat.fau.de
SUMMARY:ECAP Seminar: Heinrich Päs
DESCRIPTION:Neutrinos\, Quantum Gravity and the Big Questions – New Ideas for New Data\nNeutrinos are perfect probes of quantum gravity. The particles’ weak interactions allow to preserve quantum coherence for very long timespans\, and neutrino telescopes have started to collect data of neutrinos at extreme energies that have travelled extra-galactic distances. Moreover\, the expected breaking of global symmetries such as lepton number in quantum gravity may induce neutrino Majorana masses. The talk discusses how new ideas about quantum gravity could imply exotic properties or phenomena in the neutrino sector\, such as altered dispersion relations\, quantum-gravitational decoherence\, or UV/IR mixing that may be linked to the big open questions of particle physics and cosmology like the nature of dark matter or the electroweak hierarchy problem.
URL:https://ecap.nat.fau.de/index.php/event/ecap-seminar-2023-11-30-heinrich-pas/
LOCATION:ECAP Laboratory\, 00.061\, Nikolaus-Fiebiger-Str. 2\, Erlangen\, 91058\, Germany
CATEGORIES:Seminar
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