Affinity for scalar fields to dissipate

Abstract

The zero temperature effective equation of motion is derived for a scalar field interacting with other fields. For a broad range of cases, involving interaction with as few as one or two fields, dissipative regimes are found for the scalar field system. The zero temperature limit constitutes a baseline effect that will be prevalent in any general statistical state. Thus, the results found here provide strong evidence that dissipation is the norm not exception for an interacting scalar field system. For application to inflationary cosmology, this provides convincing evidence that warm inflation could be a natural dynamics once proper treatment of interactions is done. The results found here also may have applicability to entropy production during the chiral phase transition in heavy ion collision. PACS number(s): 98

Fine-tuning solution for hybrid inflation in dissipative chaotic dynamics

“…The results obtained in Ref. [21] show that we can evade the assumption of an initial high temperature thermal bath as used in Ref. [28] to derive the local equations of motion for the fields and makes it, therefore, more appropriate to the application we intend for here, which is the study of the initial conditions problem for the onset of inflation in hybrid inflation models characterized by potentials like Eq.…”

“…In Ref. [21] we have studied in details the general equations for the non-Markovian dissipative kernels at zero temperature and shown that for a certain class of field decaying modes the Markovian approximation is also a valid assumption. The results obtained in Ref.…”

“…In fact the magnitude of the dissipation terms may be controlled by these couplings, as shown in Refs. [15,21,28].…”

“…[15,28,21] dissipation comes from the coupling of the system fields φ and σ (here taken as background field configurations) to a bath made of a set of other fields, for example made of N ψ fermions ψ i and/or N χ scalars χ i . The general form of the interactions can be of the form…”

“…The viability of the construction of microscopic motivated models of strong dissipative inflaton models has been shown possible in the context of superstring inspired models in Ref. [20] and argued also possible for more general models in [21].…”