ASP Online Seminars: Phenomenological Aspects of Axion-Like Particles in Cosmology and Astrophysics

by Dr Ahmed Ayad (University of the Witwatersrand, South Africa)



Cosmology and particle physics are closer today than ever before, with several searches underway at the interface between cosmology, particle physics, and field theory. The mystery of dark matter (DM) is one of the greatest common unsolved problems between these fields. It is established now based on many astrophysical and cosmological observations that only a small fraction of the total matter content of the universe is made of baryonic matter, while the vast majority is constituted by dark matter. However, the nature of such a component is still unknown. One theoretically well-motivated approach to understanding the nature of dark matter would be through looking for light pseudo-scalar candidates for dark matter such as axions and axion-like particles (ALPs). Axions are hypothetical elementary particles resulting from the Peccei-Quinn (PQ) solution to the strong CP problem in quantum chromodynamics (QCD). Furthermore, many theoretically well-motivated extensions to the standard model of particle physics (SMPP) predicted the existence of more pseudo-scalar particles similar to the QCD axion and called ALPs. Axions and ALPs are characterized by their coupling with two photons. While the coupling parameter for axions is related to the axion mass, there is no direct relation between the coupling parameter and the mass of ALPs. Nevertheless, it is expected that ALPs share the same phenomenology of axions. In the past years, axions and ALPs regained popularity and slowly became one of the most appealing candidates that possibly contribute to the dark matter density of the universe. In my talk, I will show that the phenomenology of axions and ALPs interactions with photons can be used to constrain some of their properties and explain several astrophysical phenomena.

Organized by

Ahmed Ayad (ASP2018 Alumnus)

  • Abdesslam Arhrib
  • Ahmed Ayad
  • Ahmed Refaat
  • Ahmed Shaaban
  • Ann Njeri
  • Christogonus Sunday
  • Cristina Alexandru
  • Dereje Wakgari
  • ebode onyie fabien
  • Fatima Bendebba
  • Fatima Zahra LAHBABI
  • Fatma Shaban
  • Fernando Ferroni
  • Francisco Fenias Macucule
  • Hajar Imam
  • Heba Sami
  • Jamal Al Zain
  • Jaouad El Falaki
  • Jean Baptiste FANKAM FANKAM
  • Jebin Larosh
  • Jespere Calderone Nzobadila Ondze
  • Kayode Ayodeji DADA
  • Mbolahasina RALIJAONA
  • Meryem Noury
  • Mohamed Ali
  • Mohamed Belfakir
  • Mohamed Zaazoua
  • Mohammed Boukidi
  • Mounia Laassiri
  • Muhammad Ibrahim Abdulhamid
  • Nada Mahran
  • Niyonshuti Emmanuel
  • Rian Fritz Jalandoni
  • Sakina Boudissa
  • Sanae Ezzarqtouni
  • Sandile Kumalo
  • Somiealo Azote
  • Soumaya Manai
  • Ulrich Goerlach
  • Yassine El Ghazali
Zoom Meeting ID
Ketevi Adikle Assamagan
Alternative host
Steve Muanza
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