scholarly journals Long-wavelength modes of cosmological scalar fields

2006 ◽  
Vol 73 (12) ◽  
Author(s):  
Marcin Jankiewicz ◽  
Thomas W. Kephart
Keyword(s):  
Scalar Fields ◽  
Long Wavelength ◽  
Cosmological Scalar

Stability of cosmological scalar fields

1990 ◽  
Vol 105 (8-9) ◽  
pp. 961-969 ◽  
Author(s):  
D. Grasso
Keyword(s):  
Scalar Fields ◽  
Cosmological Scalar

scholarly journals Fundamental scalar fields and the dark side of the universe

2015 ◽  
Vol 24 (12) ◽  
pp. 1544025 ◽  
Author(s):  
Eduard G. Mychelkin ◽  
Maxim A. Makukov
Keyword(s):  
Dark Matter ◽  
Dark Energy ◽  
Electric Fields ◽  
Scalar Fields ◽  
Mass Scale ◽  
Dark Side ◽  
Spacetime Metric ◽  
Cosmological Scalar ◽  
Static Electric Fields ◽  
The Universe

Starting with geometrical premises, we infer the existence of fundamental cosmological scalar fields. We then consider physically relevant situations in which spacetime metric is induced by one or, in general, by two scalar fields, in accord with the Papapetrou algorithm. The first of these fields, identified with dark energy (DE), has exceedingly small but finite (subquantum) Hubble mass scale ([Formula: see text] eV), and might be represented as a neutral superposition of quasi-static electric fields. The second field is identified with dark matter (DM) as an effectively scalar conglomerate composed of primordial neutrinos and antineutrinos in a special tachyonic state.

scholarly journals Effective action for cosmological scalar fields at finite temperature

2015 ◽  
Vol 2015 (8) ◽  
Author(s):  
Yeuk-Kwan E. Cheung ◽  
Marco Drewes ◽  
Jin U Kang ◽  
Jong Chol Kim
Keyword(s):  
Effective Action ◽  
Finite Temperature ◽  
Scalar Fields ◽  
Cosmological Scalar

scholarly journals Global integrability of cosmological scalar fields

2008 ◽  
Vol 41 (46) ◽  
pp. 465101 ◽  
Author(s):  
Andrzej J Maciejewski ◽  
Maria Przybylska ◽  
Tomasz Stachowiak ◽  
Marek Szydłowski
Keyword(s):  
Scalar Fields ◽  
Global Integrability ◽  
Cosmological Scalar

scholarly journals PHANTOM UNIVERSE FROM CPT SYMMETRIC QFT

2006 ◽  
Vol 15 (08) ◽  
pp. 1299-1310 ◽  
Author(s):  
ALEXANDER A. ANDRIANOV ◽  
FRANCESCO CANNATA ◽  
ALEXANDER Y. KAMENSHCHIK
Keyword(s):  
Field Theory ◽  
Dark Energy ◽  
Scalar Field ◽  
Complex Potential ◽  
Vacuum Energy ◽  
Scalar Fields ◽  
Smooth Transition ◽  
Cpt Symmetry ◽  
Energy Equivalence ◽  
Cosmological Scalar

We develop a generalization of semiclassical field theory for the case of non-Hermitian Hamiltonians with CPT symmetry and construct a classical cosmological, scalar-field based model describing a smooth transition from ordinary dark energy to the phantom one. Our model arises from a Lagrangian with a complex potential leading to a non-trivial vacuum with real vacuum energy. Equivalence with models involving two scalar fields one of which is phantom-like is discussed.

scholarly journals Jacobi Stability Analysis of Scalar Field Models with Minimal Coupling to Gravity in a Cosmological Background

2016 ◽  
Vol 2016 ◽  
pp. 1-26 ◽  
Author(s):  
Bogdan Dănilă ◽  
Tiberiu Harko ◽  
Man Kwong Mak ◽  
Praiboon Pantaragphong ◽  
Sorin V. Sabau
Keyword(s):  
Stability Analysis ◽  
Scalar Field ◽  
Scalar Fields ◽  
Cosmological Evolution ◽  
Order System ◽  
Unstable State ◽  
Scalar Field Models ◽  
Klein Gordon ◽  
Cosmological Scalar ◽  
The Stability

We study the stability of the cosmological scalar field models by using the Jacobi stability analysis, or the Kosambi-Cartan-Chern (KCC) theory. In this approach, we describe the time evolution of the scalar field cosmologies in geometric terms, by performing a “second geometrization” and considering them as paths of a semispray. By introducing a nonlinear connection and a Berwald-type connection associated with the Friedmann and Klein-Gordon equations, five geometrical invariants can be constructed, with the second invariant giving the Jacobi stability of the cosmological model. We obtain all the relevant geometric quantities, and we formulate the condition for Jacobi stability in scalar field cosmologies. We consider the Jacobi stability properties of the scalar fields with exponential and Higgs type potential. The Universe dominated by a scalar field exponential potential is in Jacobi unstable state, while the cosmological evolution in the presence of Higgs fields has alternating stable and unstable phases. We also investigate the stability of the phantom quintessence and tachyonic scalar field models, by lifting the first-order system to the tangent bundle. It turns out that in the presence of a power law potential both of these models are Jacobi unstable during the entire cosmological evolution.

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