ORBi: Payez Alexandre - Can axionlike particles explain the alignments of the polarisations of light from quasars?

Reference : Can axionlike particles explain the alignments of the polarisations of light from quasars?


	Document type :	Scientific journals : Article
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics Physical, chemical, mathematical & earth Sciences : Physics
	To cite this reference:	http://hdl.handle.net/2268/95422

Title :	Can axionlike particles explain the alignments of the polarisations of light from quasars?
Language :	English
Author, co-author :	Payez, Alexandre [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Interactions fondamentales en physique et astrophysique >]
	Cudell, Jean-René [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Interactions fondamentales en physique et astrophysique >]
	Hutsemekers, Damien [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
Publication date :	25-Oct-2011
Journal title :	Physical Review. D : Particles and Fields
Publisher :	American Physical Society
Volume :	84
Pages :	085029, pp. 1-17
Audience :	International
ISSN :	1550-7998
e-ISSN :	1550-2368
City :	College Park
Country :	MD
Keywords :	[en] axion ; polarisation ; quasar ; large-scale ; alignment ; wave-packet
Abstract :	[en] The standard axion-like particle explanation of the observed large-scale coherent orientations of quasar polarisation vectors is ruled out by the recent measurements of vanishing of circular polarisation. We introduce a more general wave-packet formalism and show that, although decoherence effects between waves of different frequencies can reduce significantly the amount of circular polarisation, the axion-like particle hypothesis is disfavoured given the bandwidth with which part of the observations were performed. Finally, we show that a more sophisticated model of extragalactic fields does not lead to an alignment of polarisations.
Target :	Researchers ; Professionals
Permalink :	http://hdl.handle.net/2268/95422
DOI :	10.1103/PhysRevD.84.085029

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