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SUMMARY:Constraining Particle Physics models with Cosmology and Astrophysi
cs: two different cases.
DTSTART;VALUE=DATE-TIME:20240702T090000Z
DTEND;VALUE=DATE-TIME:20240702T123000Z
DTSTAMP;VALUE=DATE-TIME:20241011T145451Z
UID:indico-event-1977@indico.ifae.es
DESCRIPTION:Supervisor: Luigi Delle Rose\, Ricardo Zambujal Ferreira\n\n
\n\nAbstract:\n\nIn this thesis\, we have studied two different cases in w
hich cosmological and astrophysical observables can be used to constrain e
xtensions of the Standard Model. The first one was centered on the bubble
wall dynamics at a First-Order Electroweak Phase Transition. The main achi
evements of this thesis regarding this topic have been the following: firs
t\, we developed a very efficient numerical method with which we could fin
d\, for the first time\, the full solution of the linearized Boltzmann equ
ation in the context of the mentioned cosmological transition. Second\, we
extended our method by including the equations describing the evolution o
f the background plasma and the bubble wall. By doing so we were able to f
ind the value of the bubble wall velocity for a benchmark model. Third\, w
e confirmed that the out-of-equilibrium perturbations have an important im
pact on the value of the bubble wall speed\, so they need to be included i
n the analysis. The other case studied in this thesis involved the QCD axi
on\, the particle proposed to solve the strong CP problem. In particular\,
we computed the luminosity resulting from the resonant conversion from ax
ions to photons inside a superradiant cloud around a Black Hole. Regarding
this project\, the main achievements are the following ones: first\, the
method we used to compute the luminosity is analytical\, is mathematically
very transparent and allows to have clear quantitative and qualitative co
ntrol over the assumptions. Second\, we find that for Primordial Black Hol
es and axion masses around $10^{-5}\\\, M_\\odot$\, $10^{-7}$ eV respectiv
ely the resulting signal is so intense that it could be detected by the LO
FAR telescope. Third\, the mentioned values of PBH masses for which such d
etection could be possible match the mass range that has been used to expl
ain some ultra-short microlensing events observed by OGLE.\n\n \n\n \n\n
https://indico.ifae.es/event/1977/
LOCATION:Hybrid IFAE Seminar Room
URL:https://indico.ifae.es/event/1977/
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