By Roberto D. Peccei (auth.), Markus Kuster, Georg Raffelt, Berta Beltrán (eds.)
Axions are extraordinary hypothetical debris which could either clear up the CP challenge of quantum chromodynamics and while account for the darkish subject of the universe. according to a sequence of lectures by way of global specialists during this box held at CERN (Geneva), this quantity offers a pedagogical creation to the speculation, cosmology and astrophysics of those interesting debris and provides an up to date account of the prestige and prospect of ongoing and deliberate experimental searches. rookies and practitioners of astroparticle physics will locate during this ebook either a concise creation and a present reference paintings to a show off subject that connects the "inner area" of the easy particle international with the "outer area" of the universe at large.
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Additional info for Axions: Theory, Cosmology, and Experimental Searches
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Va (a) is therefore periodic with period Δa = 2π va /N = 2πfa . 30) where the axion mass ma (t) = ma [T (t)] is a function of temperature and hence of time. 27) implies that the axion ﬁeld has a range 0 ≤ a ≤ 2πva . Hence there are N degenerate vacua. The discrete degeneracy implies the existence of domain walls, which will be discussed in Sect. 3. 29), the equation of motion becomes ∂t2 + 3 R˙ 1 ∂t − 2 ∇2x R R a(x) m2a (t) fa sin a(x) fa =0. 32) where Nf is the number of quark ﬂavors with mass less than T .
Phys. Rev. D 28, 679 (1983) 45 63. : First year Wilkinson Microwave Anisotropy Probe (WMAP) observations: Implications for inﬂation. Astrophys. J. Suppl. 148, 213 (2003) [astro-ph/0302225] 45 64. : Correlated adiabatic and isocurvature CMB ﬂuctuations in the wake of WMAP. Phys. Rev. Lett. 91, 131302 (2003) [astroph/0304175] 45 50 P. Sikivie 65. : Bounds on isocurvature perturbations from CMB and LSS data. Phys. Rev. Lett. 91, 171301 (2003) [astro-ph/0306286] 45 66. : Isocurvature bounds on axions revisited.