Fluctuation-dissipation dynamics of cosmological scalar fields
نویسندگان
چکیده
منابع مشابه
Global dynamics of cosmological scalar fields – Part I
We investigate the Liouvillian integrability of Hamiltonian systems describing a universe filled with a scalar field (possibly complex). The tool used is the differential Galois group approach, as introduced by Morales-Ruiz and Ramis. The main result is that the generic systems are non-integrable, although there still exist some values of parameters for which integrability remains undecided. We...
متن کاملGlobal dynamics of cosmological scalar fields – Part II
This is the second part of integrability analysis of cosmological models with scalar fields. Here, we study systems with conformal coupling, and show that apart from four cases, where explicit first integrals are known, the generic system is not integrable. We also comment on some chaotic properties of the system, and the issues of integrability restricted to the real domain.
متن کاملFluctuation-dissipation theorem and the Unruh effect of scalar and Dirac fields
We present a simple and systematic method to calculate the Rindler noise, which is relevant to the analysis of the Unruh effect, by using the fluctuation-dissipative theorem. To do this, we calculate the dissipative coefficient explicitly from the equations of motion of the detector and the field. This method gives not only the correct answer but also a hint as to the origin of the apparent sta...
متن کاملLong-Wavelength Modes of Cosmological Scalar Fields
Scalar fields have played a major role in attempts to model the early Universe. In particular, nearly every incarnation of the inflation scenario has relied on scalars to generate vacuum energy and in turn exponential expansion and density fluctuations. Many of these models rely on slow roll potentials, i.e., potentials that are nearly flat where the scalar masses can be very small. Recently, h...
متن کاملNonlinear perturbations of cosmological scalar fields
We present a covariant formalism for studying nonlinear perturbations of scalar fields. In particular, we consider the case of two scalar fields and introduce the notion of adiabatic and isocurvature covectors. We obtain differential equations governing the evolution of these two covectors, as well as the evolution equation for the covector associated with the curvature perturbation. The form o...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical Review D
سال: 2015
ISSN: 1550-7998,1550-2368
DOI: 10.1103/physrevd.91.083540