Isocurvature Fluctuations of the M - theory Axion Observable ?
نویسندگان
چکیده
Banks and Dine have recently shown that the M theory naturally accommodates the Peccei-Quinn axion. Since the decay constant F a of the axion is large as F a ≃ 10 15 − 10 16 GeV, the halo axion is hardly detected in coming axion-search experiments. However, we show that isocurvature fluctuations of the M-theory axion produced at the inflationary epoch are most likely detectable in future satellite experiments on anisotropies of the cosmic microwave background radiation.
منابع مشابه
Observational Implications of Axionic Isocurvature Fluctuations
Axion is the most attractive candidate to solve the strong CP problem in QCD. If it exists, the inflationary universe produces axion fluctuations which are mixture of isocurvature and adiabatic fluctuations in general. We investigate how large isocurvature fluctuations are allowed or favored in order to explain observations of the large scale structure of the present universe. Generic flat univ...
متن کاملIsocurvature Fluctuations of the M-theory Axion in a Hybrid Inflation Model
The M-theory which is the strong-coupling heterotic string theory brings various interesting new phenomenologies to us. The M-theory bulk axion is one of them, whose decay constant is estimated as Fa ≃ 10GeV. Direct searches for the M-theory axion seem impossible because of the large decay constant. However, we point out that large isocurvature fluctuations of the Mtheory axion are obtained in ...
متن کاملCosmological Axion Problem in Chaotic Inflationary Universe
We investigate two cosmological axion problems (isocurvature fluctuations and domain-wall formation) in chaotic inflationary universe. It is believed that these problems are solved if potential for the Peccei-Quinn scalar field is very flat. However , we find that too many domain walls are produced through parametric resonance decay of the Peccei-Quinn scalar field. Only the axion model with N ...
متن کاملObservable isocurvature fluctuations from the Affleck-Dine condensate
In D-term inflation models, Affleck-Dine baryogenesis produces isocurvature density fluctuations. These can be perturbations in the baryon number, or, in the case where the present neutralino density comes directly from B-ball decay, perturbations in the number of dark matter neutralinos. The latter case results in a large enhancement of the isocurvature perturbation. The requirement that the d...
متن کاملIsocurvature forecast in the anthropic axion window
We explore the cosmological sensitivity to the amplitude of isocurvature fluctuations that would be caused by axions in the “anthropic window” where the axion decay constant fa ≫ 10 GeV and the initial misalignment angle Θi ≪ 1. In a minimal ΛCDM cosmology extended with subdominant scale-invariant isocurvature fluctuations, existing data constrain the isocurvature fraction to α < 0.09 at 95% C....
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 1997