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Title: Dynamical Solution to the Problem of a Small Cosmological Constant and Late-Time Cosmic Acceleration

Abstract

Increasing evidence suggests that most of the energy density of the universe consists of a dark energy component with negative pressure that causes the cosmic expansion to accelerate. We address why this component comes to dominate the universe only recently. We present a class of theories based on an evolving scalar field where the explanation is based entirely on internal dynamical properties of the solutions. In the theories we consider, the dynamics causes the scalar field to lock automatically into a negative pressure state at the onset of matter domination such that the present epoch is the earliest possible time consistent with nucleosynthesis restrictions when it can start to dominate.

Authors:
; ;
Publication Date:
Sponsoring Org.:
(US)
OSTI Identifier:
40205906
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 85; Journal Issue: 21; Other Information: Othernumber: PRLTAO000085000021004438000001; 012047PRL; PBD: 20 Nov 2000; Journal ID: ISSN 0031-9007
Publisher:
The American Physical Society
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ACCELERATION; COSMOLOGICAL CONSTANT; ENERGY DENSITY; NUCLEOSYNTHESIS; SCALAR FIELDS; UNIVERSE

Citation Formats

Armendariz-Picon, C., Mukhanov, V., and Steinhardt, Paul J. Dynamical Solution to the Problem of a Small Cosmological Constant and Late-Time Cosmic Acceleration. United States: N. p., 2000. Web. doi:10.1103/PhysRevLett.85.4438.
Armendariz-Picon, C., Mukhanov, V., & Steinhardt, Paul J. Dynamical Solution to the Problem of a Small Cosmological Constant and Late-Time Cosmic Acceleration. United States. doi:10.1103/PhysRevLett.85.4438.
Armendariz-Picon, C., Mukhanov, V., and Steinhardt, Paul J. Mon . "Dynamical Solution to the Problem of a Small Cosmological Constant and Late-Time Cosmic Acceleration". United States. doi:10.1103/PhysRevLett.85.4438.
@article{osti_40205906,
title = {Dynamical Solution to the Problem of a Small Cosmological Constant and Late-Time Cosmic Acceleration},
author = {Armendariz-Picon, C. and Mukhanov, V. and Steinhardt, Paul J.},
abstractNote = {Increasing evidence suggests that most of the energy density of the universe consists of a dark energy component with negative pressure that causes the cosmic expansion to accelerate. We address why this component comes to dominate the universe only recently. We present a class of theories based on an evolving scalar field where the explanation is based entirely on internal dynamical properties of the solutions. In the theories we consider, the dynamics causes the scalar field to lock automatically into a negative pressure state at the onset of matter domination such that the present epoch is the earliest possible time consistent with nucleosynthesis restrictions when it can start to dominate.},
doi = {10.1103/PhysRevLett.85.4438},
journal = {Physical Review Letters},
issn = {0031-9007},
number = 21,
volume = 85,
place = {United States},
year = {2000},
month = {11}
}