Cosmic Acceleration, Dark Energy and Fundamental Physics

Abstract

A web of interlocking observations has established that the expansion of the Universe is speeding up and not slowing, revealing the presence of some form of repulsive gravity. Within the context of general relativity the cause of cosmic acceleration is a highly elastic (p\sim -rho), very smooth form of energy called ``dark energy'' accounting for about 75% of the Universe. The ``simplest'' explanation for dark energy is the zero-point energy density associated with the quantum vacuum; however, all estimates for its value are many orders-of-magnitude too large. Other ideas for dark energy include a very light scalar field or a tangled network of topological defects. An alternate explanation invokes gravitational physics beyond general relativity. Observations and experiments underway and more precise cosmological measurements and laboratory experiments planned for the next decade will test whether or not dark energy is the quantum energy of the vacuum or something more exotic, and whether or not general relativity can self consistently explain cosmic acceleration. Dark energy is the most conspicuous example of physics beyond the standard model and perhaps the most profound mystery in all of science.

10 pages, 8 figures, invited review for Journal of the Physical Society of Japan, in press

References in corpus (26)

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Measurements of Omega and Lambda from 42 High-Redshift Supernovae
• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Determination of Cosmological Parameters
• Detection of the Baryon Acoustic Peak in the Large-Scale Correlation Function of SDSS Luminous Red Galaxies
• Type Ia Supernova Discoveries at z>1 From the Hubble Space Telescope: Evidence for Past Deceleration and Constraints on Dark Energy Evolution
• 4D Gravity on a Brane in 5D Minkowski Space
• The Cosmological Constant
• The Supernova Legacy Survey: Measurement of Omega_M, Omega_Lambda and w from the First Year Data Set
• Is Cosmic Speed-Up Due to New Gravitational Physics?
• New Constraints on ${\Omega }_M$, ${\Omega }_{\Lambda }$, and w from an Independent Set of Eleven High-Redshift Supernovae Observed with HST
• Cosmological Constraints from the SDSS Luminous Red Galaxies
• Quantization of Four-form Fluxes and Dynamical Neutralization of the Cosmological Constant
• Quintessence and the Rest of the World
• Constraints on dark energy from Chandra observations of the largest relaxed galaxy clusters
• Cosmic Microwave Background Anisotropies
• Braneworld models of dark energy
• CDM Models with a Smooth Component
• Probing the dark energy: methods and strategies
• Structure Formation with Generalized Dark Matter
• The Cosmological Constant is Back
• A correlation of the cosmic microwave sky with large scale structure
• Weak Lensing and Dark Energy
• What Do We Really Know About Cosmic Acceleration?
• Dark Energy Constraints from the CTIO Lensing Survey
• Probing Dark Energy with Supernovae: Exploiting Complementarity with the Cosmic Microwave Background
• Direct Dark Matter Searches

Cited by in corpus (45)

• Dark Energy
• A test of the nature of cosmic acceleration using galaxy redshift distortions
• The Clustering of Galaxies in the SDSS-III DR9 Baryon Oscillation Spectroscopic Survey: Testing Deviations from $\Lambda$ and General Relativity using anisotropic clustering of galaxies
• Bianchi type III models with anisotropic dark energy
• LRS Bianchi Type I Models with Anisotropic Dark Energy and Constant Deceleration Parameter
• Improved Constraints on the Acceleration History of the Universe and the Properties of the Dark Energy
• Anisotropic Cosmological Constant and the CMB Quadrupole Anomaly
• Dark energy models with variable equation of state parameter
• Bianchi Type III Anisotropic Dark Energy Models with Constant Deceleration Parameter
• Dark energy models from a parametrization of $H$: A comprehensive analysis and observational constraints
• Growth Index of DGP Model and Current Growth Rate Data
• One Hundred Years of the Cosmological Constant: from 'Superfluous Stunt' to Dark Energy
• The growth of linear perturbations in the DGP model
• Constraints on Kinematic Model from Recent Cosmic Observations: SN Ia, BAO and Observational Hubble Data
• Resource Letter: Dark Energy and the Accelerating Universe
• Cylindrically Symmetric Solutions in $f(R,T)$ Gravity
• The growth factor of matter perturbations in an f(R) gravity
• Bianchi Type $I$ Cosmology in $f(R,T)$ Gravity
• All "static" spherically symmetric perfect fluid solutions of Einstein's equations with constant equation of state parameter and finite-polynomial "mass function"
• Model-Independent Reconstruction of the Expansion History of the Universe from Type Ia Supernovae
• Accelerating bianchi type dark energy cosmological model with cosmic string in f(T) Gravity
• Gravitational Dust Collapse in $f(R)$ Gravity
• Inflationary Cosmology in the Modified $f(R,T)$ Gravity
• Quintessence versus phantom dark energy: the arbitrating power of current and future observations
• Observational constraints on scalar field models of dark energy with barotropic equation of state
• Phase-space of flat Friedmann-Robertson-Walker models with both a scalar field coupled to matter and radiation
• The role of curvature in the slowing down acceleration scenario
• Evolution of Anisotropies in Eddington-Born-Infeld Cosmology
• Dark Energy Models With Variable Equation Of State Parameter
• Revisiting a model-independent dark energy reconstruction method
• Exploring Plane Symmetric Solutions in $f(R)$ Gravity
• Dark Matter and Particle Physics
• Testing a dissipative kinetic k-essence model
• The general static spherical perfect fluid solution with EoS parameter w=-1/5
• Dark matter and cosmic acceleration from Wesson's IMT
• Gravitation as a Casimir interaction
• Dark matter, dark energy and modern cosmology: the case for a Kuhnian paradigm shift
• ZKDR Distance, Angular Size and Phantom Cosmology
• Cosmological Equation of State and Interacting Energies
• White dwarfs as a probe of dark energy
• Stability of Differentially Rotating Disks in $f(T)$ Theory
• An analysis of Born-Infeld boson compact objects
• Nonlinear Spinors as the Candidate of Dark Matter
• Tracing Signatures of Modified Gravity in Redshift-Space Galaxy Bispectrum Multipoles: Prospects for Euclid
• A cyclic cosmological model based on the f(ρ) modified theory of gravity