Production by Nambu Goldstone Bosons with Application to Inflation Rehea
نویسنده
چکیده
A semiclassical calculation of particle production by a scalar field in a potential is performed. We focus on the particular case of production of fermions by a NambuGoldstone boson θ. We have derived a (non)local equation of motion for the θ-field with the backreaction of the produced particles taken into account. The equation is solved in some special cases, namely for purely Nambu-Goldstone bosons and for the tilted potential U(θ) ∝ mθ. Enhanced production of bosons due to parametric resonance is investigated; we argue that the resonance probably disappears when the expansion of the universe is included. Application of our work on particle production to reheating and an idea for baryogenesis in inflation are mentioned. PAC Numbers: 98.80.–k, 98.80.Cq, 14.80.Mz, 11.30.Fs
منابع مشابه
Calculation of particle production by Nambu-Goldstone bosons with application to inflation reheating and baryogenesis.
A semiclassical calculation of particle production by a scalar eld in a potential is performed. We focus on the particular case of production of fermions by a NambuGoldstone boson . We have derived a (non)local equation of motion for the eld with the backreaction of the produced particles taken into account. The equation is solved in some special cases, namely for purely Nambu-Goldstone bosons ...
متن کاملA Coupling of Pseudo Nambu Goldstone Bosons to Other Scalars and Role in Double Field Inflation
We find a coupling of Pseudo Nambu Goldstone bosons (PNGBs) to other (ordinary) scalars, and consider its importance in various contexts. Our original motivation was the model of Double Field inflation [1]. We also briefly consider the role of this coupling for the case of the QCD axion. PACS Numbers: 14.80.Mz, and 98.80.-k,Cq.
متن کاملThe curvaton as a Bose-Einstein condensate of chiral pseudo Nambu-Goldstone bosons
Explaining cosmic inflation by the effective dynamics of an SU(NC) pure gauge theory of scale Λ ∼ 10−6 Mp is lacking an explanation of the (Gaussian) spatial curvature perturbations needed to seed the formation of large-scale structure after inflation. In this work it is demonstrated how fundamentally charged fermions of mass mF ∼ 10−12 Λ, whose approximate chiral symmetry is spontaneously brok...
متن کاملN-flationary magnetic fields
There is increasing interest in the role played by pseudo Nambu-Goldstone bosons (pNGBs) in the construction of string–inspired models of inflation. In these models the inflaton is expected to be coupled to gauge fields, and will lead to the generation of magnetic fields that can be of cosmological interest. We study the production of such fields mainly focusing on the model of N-flation, where...
متن کاملFluctuation-induced Nambu-Goldstone bosons in a Higgs-Josephson model
We present a new mechanism of fluctuation-induced Nambu-Goldstone bosons in a scalar field theory of Higgs-Josephson systems. We consider a simple scalar field model with U(1) rotational symmetry. When there is an interaction which violates the rotational symmetry, the Nambu-Goldstone bosons become massive and massless bosons are concealed. We present a model where the massive boson becomes a m...
متن کامل