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SUMMARY:Axions in plasmas: from the lab to astrophysics
DTSTART:20260415T130000Z
DTEND:20260415T140000Z
DTSTAMP:20260610T213900Z
UID:indico-event-2174@indico.lip.pt
CONTACT:pbras@lip.pt\;psilva@uc.pt
DESCRIPTION:Speakers: Hugo Terças (Departamento de Física - Instituto Su
 perior de Engenharia de Lisboa\; GoLP - Group of Lasers and Plasmas - Inst
 ituto de Plasmas e Fusão Nuclear)\n\nAxions constitute one of the most el
 egant and theoretically well motivated extensions of the standard model. D
 espite the fact of being so far elusive\, they have been proposed to solve
  the apparent breaking of the charge-parity (CP) symmetry in QCD - the fam
 ous strong CP problem - by promoting the small CP angle observed in experi
 ments to a field: the axion restores the CP symmetry in QCD dynamically\, 
 via a mechanism that is reminiscent to that of the Higgs boson when giving
  mass to the gauge fields.\nOn the other hand\, the smallness of such CP b
 reaking implies an extremely weak coupling to photons\, which renders axio
 ns one of the most appealing candidates for dark matter. Altogether\, the 
 axion is a most-hunted particle\, and a plethora of experiments are curren
 tly devoted to its searches. One critical limitation to the current experi
 mental platforms is that they rely on axion-photon conversion\, which is a
  non-resonant process.\nA natural way to circumvent this issue is to desig
 n experiments using plasmas\, thus relying on the resonant axion-plasmon c
 onversion. We show that\, by exploiting the physics of electrostatic insta
 bilities taking place in plasmas\, we are allowed to increase the conversi
 on probability (or\, equivalently\, the axion decay rate) by several order
 s of magnitude. Moreover\, by replacing real plasmas by synthetic (meta ma
 terial) plasmas\, we might be able to probe the axion within the parameter
  region predicted by the QCD.\nFinally\, given the ubiquity of plasmas in 
 the different astrophysical scenarios\, we investigate some consequences o
 f the axion-plasmon conversion in the production of axions in magnetars an
 d discuss the importance of axion conversion in intergalactic plasmas.\n\n
 https://indico.lip.pt/event/2174/
LOCATION:Sala de Conferências (Departamento de Física FCTUC)
URL:https://indico.lip.pt/event/2174/
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