Sökning: "NATURAL SCIENCES Physics Astronomy and astrophysics Astroparticle physics"

Visar resultat 6 - 10 av 12 avhandlingar innehållade orden NATURAL SCIENCES Physics Astronomy and astrophysics Astroparticle physics.

1. 6. Exploring the potentials of next-generation, wavelength-shifting, optical sensors for IceCube

   Författare :Jakob Beise; Erin O'Sullivan; Christian Ohm; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Neutrino Physics; Astroparticle Physics; Supernovae; Wavelength Shifters; IceCube;

   Sammanfattning : The IceCube Neutrino Observatory has sensitivity to MeV electron antineutrinos from core-collapse supernovae through an excess of the detection rate over the background. Wavelength-shifting sensors have the potential to greatly increase photon collection making it a promising candidate for improving the measurement of the supernova neutrino light curve in IceCube-Gen2. LÄS MER

3. 7. Bright Needles in a Haystack : A Search for Magnetic Monopoles Using the IceCube Neutrino Observatory

   Författare :Alexander Burgman; Carlos Pérez de los Heros; Olga Botner; Allan Hallgren; David Milstead; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; magnetic monopole; IceCube; astroparticle physics; neutrino telescope; Fysik med inriktning mot elementarpartikelfysik; Physics with specialization in Elementary Particle Physics;

   Sammanfattning : The IceCube Neutrino Observatory at the geographic South Pole is designed to detect the light produced by the daughter-particles of in-ice neutrino-nucleon interactions, using one cubic kilometer of ice instrumented with more than 5000 optical sensors.Magnetic monopoles are hypothetical particles with non-zero magnetic charge, predicted to exist in many extensions of the Standard Model of particle physics. LÄS MER

4. 8. Search for neutrinos from precursors and afterglows of Gamma-ray Bursts using the IceCube Neutrino Observatory

   Författare :Kunal Deoskar; Chad Finley; Klas Hultqvist; Magnus Axelsson; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Astroparticle physics; neutrinos; acceleration of particles; Gamma ray bursts; Physics; fysik;

   Sammanfattning : Gamma ray bursts (GRBs) have long been considered as a possible source of ultra high energy cosmic rays, which makes them a promising neutrino source candidate. Previous IceCube searches for neutrino correlations with GRBs focused on the prompt phase of the GRB and found no significant correlation between neutrino events and the observed GRBs. LÄS MER

5. 9. Seeking the faint extremes : Detection and characterisation of extragalactic soft-spectrum gamma-ray sources and exploring methods to enhance their detection with machine learning in the 50 GeV-50 TeV energy range

   Författare :Tomas Bylund; Yvonne Becherini; Gilles Henri; Linnéuniversitetet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; GeV gamma-rays; TeV gamma-rays; AGN; blazar; deep learning; observational high-energy astronomy; Astroparticle Physics; Astropartikelfysik;

   Sammanfattning : This thesis deals with an observational study of Blazars, strong gamma-ray sources with Very High Energies (VHE) located far outside our Galaxy. Blazars are a class of galaxies that contain a supermassive black hole that is actively consuming large quantities of matter, a process that results in the liberation of tremendous amounts of energy that then powers the emission of huge bulks of charged particles that get accelerated almost to the speed of light. LÄS MER

7. 10. Astrophysical probes of axionlike particles

   Författare :Eike Christoph Ravensburg; M. C. David Marsh; Frank Wilczek; Joerg Jaeckel; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; astroparticle physics; axions; supernovae; physics beyond the standard model; dark matter; Theoretical Physics; teoretisk fysik;

   Sammanfattning : This thesis is a contribution to the search for new fundamental physics in the form of axionlike particles (ALPs). ALPs are relatively light and feebly interacting particles that are part of many theories extending the Standard Model of particle physics, e.g. LÄS MER