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Identifier

000414777

Title

Assessment of the localizability of Ultra-High Energy Cosmic-Ray (UHECR) sources through next-generation optopolarimetric experiments.

Alternative Title

Εκτίμηση της εντοπισιμότητας των πηγών κοσμικών ακτίνων υπερ-υψηλών ενεργειών μέσω οπτοπολωσιμετρικών πειραμάτων επόμενης γενιάς.

Author

Βέλλη, Μαρία-Χριστίνα Γ.

Thesis advisor

Παυλίδου, Βασιλική

Abstract

The sources of the most energetic particles known in our universe (Ultra-High Energy Cosmic Rays), still remain unknown. Their discovery will not only enlighten the mystery of what mechanism (cosmic accelerator) could possibly accelerate these particles up to energies 10²⁰ eV, but also will possibly reveal new particle physics, or new astrophysical objects. The main reason why it is difficult to locate such sources is because particles coming from them are ionized atoms and so they get deflected by the Galactic magnetic field and our knowledge of its 3-dimensional structure is limited. That is because until today only observations of quantities integrated along the line of sight are possible. Next-generation optopolarimetric experiments such as the PASIPHAE programme, will provide such information in the near future and so we will be able to back-propagate/correct the trajectories of the highest-energy cosmic rays. In this work we examine how the significance of the detection of an UHECR source gets better with such correction. Our results show that for a very plausible correction, such as reducing the deflection angles to half their current values, then for an initial 3σ significance reported source, we would get the significance to rise to 4.5σ.

Language

English

Subject

Back-propagation

Significance measurements

UHECR

Διόρθωση τροχιάς

Κοσμικές ακτίνες υπερ-υψηλών ενεργειών

Issue date

2018-03-23

Collection

School/Department--School of Sciences and Engineering--Department of Physics--Post-graduate theses