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Dark Energy and the Accelerating Universe
Joshua Frieman, Michael Turner, Dragan Huterer
The discovery ten years ago that the expansion of the Universe is accelerating put in place the last major building block of the present cosmological model, in which the Universe i…
Cosmic Acceleration, Dark Energy and Fundamental Physics
Michael S. Turner, Dragan Huterer
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. With…
What Do We Really Know About Cosmic Acceleration?
Charles Shapiro, Michael S. Turner
Essentially all of our knowledge of the acceleration history of the Universe - including the acceleration itself - is predicated upon the validity of general relativity. Without re…
The Cosmology of Generalized Modified Gravity Models
Sean M. Carroll, Antonio De Felice, Vikram Duvvuri +3
We consider general curvature-invariant modifications of the Einstein-Hilbert action that become important only in regions of extremely low space-time curvature. We investigate the…
Is Cosmic Speed-Up Due to New Gravitational Physics?
Sean M. Carroll, Vikram Duvvuri, Mark Trodden +1
We show that cosmic acceleration can arise due to very tiny corrections to the usual gravitational action of General Relativity of the form , with . This eliminates the n…
Dark Energy as a Modification of the Friedmann Equation
Gia Dvali, Michael S. Turner
Dark energy could actually be the manifestation of a modification to the Friedmann equation arising from new physics (e.g., extra dimensions). Writing the correction as $(1-Ω_M)H^α…
The New Cosmology: Mid-term Report Card for Inflation
Michael S. Turner
Inflation has been the driving idea in cosmology for two decades and is a pillar of the New Cosmology. The inflationary paradigm has now passed its first round of significant tests…
Probing Dark Energy with Supernovae: Exploiting Complementarity with the Cosmic Microwave Background
Joshua A. Frieman, Dragan Huterer, Eric V. Linder +1
A primary goal for cosmology and particle physics over the coming decade will be to unravel the nature of the dark energy that drives the accelerated expansion of the Universe. In…
Making Sense Of The New Cosmology
Michael S. Turner
Over the past three years we have determined the basic features of the Universe -- spatially flat; accelerating; comprised of 1/3 a new form of matter, 2/3 a new form of energy, wi…
The New Cosmology
Michael S. Turner
Over the past three years we have determined the basic features of our Universe. It is spatially flat; accelerating; comprised of 1/3 a new form of matter, 2/3 a new form of energy…
A Cosmic Perspective from Lapland in 2001
Michael S. Turner
A convergence of ideas, observations and technology have led to the greatest period of cosmological discovery yet. Over the past three years we have determined the basic features o…
Dark Energy and the New Cosmology
Michael S. Turner
A successor to the standard hot big-bang cosmology is emerging. It greatly extends the highly successful hot big-bang model. A key element of the New Standard Cosmology is dark ene…
Do SNe Ia Provide Direct Evidence for Past Deceleration of the Universe?
Michael S. Turner, Adam Riess
Observations of SN 1997ff at z ~ 1.7 favor the accelerating Universe interpretation of the high-redshift type Ia supernova data over simple models of intergalactic dust or SN lumin…
The Case for Omega_M = 0.33 +/- 0.035
Michael S. Turner
For decades, the determination of the mean density of matter(Omega_M) has been tied to the distribution of light. This has led to a ``bias,'' perhaps as large as a factor of 2, in…
New HST spectra indicate the QSO PG1718+4807 will not give the primordial deuterium abundance
David Kirkman, David Tytler, John M. O'Meara +6
The z ~ 0.701 absorption system towards the QSO PG1718+4807 is the only example of a QSO absorption system which might have a deuterium/hydrogen ratio approximately ten times the v…
Constraining the Properties of Dark Energy
Dragan Huterer, Michael S. Turner
The presence of dark energy in the Universe is inferred directly from the accelerated expansion of the Universe, and indirectly, from measurements of cosmic microwave background (C…
A Sober Assessment of Cosmology at the New Millennium
Michael S. Turner
Cosmology is the dot com of the sciences. Boom or bust. It is about nothing less than the origin and evolution of the Universe, the all of everything. It is the boldest of enterpri…
Probing the dark energy: methods and strategies
Dragan Huterer, Michael S. Turner
The presence of dark energy in the Universe is inferred directly from the accelerated expansion of the Universe, and indirectly, from measurements of cosmic microwave background (C…
Big-Bang Nucleosynthesis Predictions for Precision Cosmology
Scott Burles, Kenneth M. Nollett, Michael S. Turner
The determination of the primeval deuterium abundance has opened a precision era in big-bang nucleosynthesis (BBN), making accurate predictions more important than ever before. We…
What Is The BBN Prediction for the Baryon Density and How Reliable Is It?
Scott Burles, Kenneth M. Nollett, Michael S. Turner
Together, the standard theory of big-bang nucleosynthesis (BBN) and the primeval deuterium abundance now very precisely peg the baryon density. Based upon our analysis of the deute…
Optimal Supernova Search Strategies
Dragan Huterer, Michael S. Turner
Recent use of Type Ia supernovae to measure acceleration of the universe has motivated questions regarding their optimal use to constrain cosmological parameters Omega_M, Omega_Λ a…
Kinematic Constraints to the Key Inflationary Observables
Mark B. Hoffman, Michael S. Turner
The observables and are key to testing and understanding inflation. (, , and respectively quantify the gravity-wave and density-perturbation contributions t…
Dark Matter, Dark Energy and Fundamental Physics
Michael S. Turner
More than sixty years ago Zwicky made the case that the great clusters of galaxies are held together by the gravitational force of unseen (dark) matter. Today, the case is stronger…
On the degree of scale invariance of inflationary perturbations
Dragan Huterer, Michael S. Turner
Many, if not most, inflationary models predict the power-law index of the spectrum of density perturbations is close to one, though not precisely equal to one, |n-1| \sim O(0.1), i…