Moduli-induced gravitino problem.
نویسندگان
چکیده
We investigate the cosmological moduli problem by studying a modulus decay in detail and find that the branching ratio of the gravitino production is generically of O(0.01-1), which causes another cosmological disaster. Consequently, the cosmological moduli problem cannot be solved simply by making the modulus mass heavier than 100 TeV. We also illustrate our results by explicitly calculating the branching ratio into the gravitinos in the mixed modulus-anomaly model.
منابع مشابه
Gravitino Production from Heavy Moduli Decay and Cosmological Moduli Problem Revived
The cosmological moduli problem for relatively heavy moduli fields is reinvestigated. For this purpose we examine the decay of a modulus field at a quantitative level. The modulus dominantly decays into gauge bosons and gauginos, provided that the couplings among them are not suppressed in the gauge kinetic function. Remarkably the modulus decay into a gravitino pair is unsuppressed generically...
متن کاملNon-thermal Dark Matter and the Moduli Problem in String Frameworks
We address the cosmological moduli/gravitino problems and the issue of too little thermal but excessive non-thermal dark matter from the decays of moduli. The main examples we study are the G2-MSSM models arising from M theory compactifications, which allow for a precise calculation of moduli decay rates and widths. We find that the late decaying moduli satisfy both BBN constraints and avoid th...
متن کاملGravitinos from Heavy Scalar Decay
Cosmological issues of the gravitino production by the decay of a heavy scalar field X are examined, assuming that the damped coherent oscillation of the scalar once dominates the energy of the universe. The coupling of the scalar field to a gravitino pair is estimated both in spontaneous and explicit supersymmetry breaking scenarios, with the result that it is proportional to the vacuum expect...
متن کاملKKLT type models with moduli-mixing superpotential
We study KKLT type models with moduli-mixing superpotential. In several string models, gauge kinetic functions are written as linear combinations of two or more moduli fields. Their gluino condensation generates moduli-mixing superpotential. We assume one of moduli fields is frozen already around the string scale. It is found that Kähler modulus can be stabilized at a realistic value without tu...
متن کاملA Bottom - Up Approach to Moduli Dynamics in Heavy Gravitino Scenario : Superpotential , Soft Terms and Sparticle Mass Spectrum
Physics of moduli fields is examined in the scenario where gravitino is relatively heavy with mass of order 10 TeV, which may be favored in view of the severe gravitino problem. The form of moduli superpotential is shown to be determined, if one imposes a phenomenological requirement that no physical CP phase arises in gaugino masses from conformal anomaly mediation. This bottom-up approach all...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Physical review letters
دوره 96 21 شماره
صفحات -
تاریخ انتشار 2006