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The 2nd International Conference "Exploring the Energetic Universe 2019"
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Browsing The 2nd International Conference "Exploring the Energetic Universe 2019" by Title

Browsing The 2nd International Conference "Exploring the Energetic Universe 2019" by Title

Now showing items 1-20 of 33

Accelerated Parameter Estimation with DALE X

Daniel, Scott F.; Linder, Eric V. (NURIS; Energetic Cosmos Laboratory, 2017-05-08)

We consider methods for improving the estimation of constraints on a high-dimensional parameter space with a computationally expensive likelihood function. In such cases Markov chain Monte Carlo (MCMC) can take a long time ...
The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: Constraining modified gravity

Mueller, Eva-Maria; Percival, Will; Linder, Eric; Alam, Shadab; Zhao, Gong-Bo; Sanchez, Ariel G.; Beutler, Florian (American Physical Society, 2016-12-02)

We use baryon acoustic oscillation and redshift space distortion from the completed Baryon Oscillation Spectroscopic Survey, corresponding to data release 12 of the Sloan Digital Sky Survey, combined sample analysis in ...
Constraining dark energy dynamics in extended parameter space

Di Valentino, Eleonora; Melchiorri, Alessandro; Linder, Eric V.; Silk, Joseph (American Physical Society, 2017-07-19)

Dynamical dark energy has been recently suggested as a promising and physical way to solve the 3 sigma tension on the value of the Hubble constant H0 between the direct measurement of Riess et al. (2016) (R16, hereafter) ...
Cosmic Curvature Tested Directly from Observations

Denissenya, Mikhail; Linder, Eric V.; Shafieloo, Arman (NURIS; Energetic Cosmos Laboratory, 2018-02-13)

Cosmic spatial curvature is a fundamental geometric quantity of the Universe. We investigate a model independent, geometric approach to measure spatial curvature directly from observations,without any derivatives of data. ...
Cosmic growth and expansion conjoined

Linder, Eric V. (2017-01-31)

Abstract Cosmological measurements of both the expansion history and growth history have matured, and the two together provide an important test of general relativity. We consider their joint evolutionary track, showing ...
Cosmic Growth Signatures of Modified Gravitational Strength

Denissenya, Mikhail; Linder, Eric V. (NURIS; Energetic Cosmos Laboratory, 2018-09-05)

Cosmic growth of large scale structure probes the entire history of cosmic expansion and gravitational coupling. To get a clear picture of the effects of modification of gravity we consider a deviation in the coupling ...
Dark Energy from α-attractors: Phenomenology and Observational Constraints

Garcia-Garcia, Carlos; Linder, Eric V.; Ruiz-Lapuente, Pilar; Zumalacaregui, Miguel (NURIS; Energetic Cosmos Laboratory, 2018-03-01)

The possibility of linking inflation and late cosmic accelerated expansion using the α-attractor models has received increasing attention due to their physical motivation. In the early universe, α-attractors provide an ...
Debiasing Cosmic Gravitational Wave Sirens [Article]

Keeley, Ryan E.; Shafieloo, Arman; L'Huillier, Benjamin; Linder, Eric V. (NURIS; Energetic Cosmos Laboratory, 2019-05-27)

Accurate estimation of the Hubble constant, and other cosmological parameters, from distances measured by cosmic gravitational wave sirens requires sufficient allowance for the dark energy evolution. We demonstrate how ...
Developments in Cosmic Growth and Gravitation [Article]

Linder, Eric V. (NURIS; Energetic Cosmos Laboratory, 2019-04-23)

Cosmic surveys of large scale structure have imaged hundreds of millions of galaxies and mapped the 3D positions of over a million. Surveys starting over the next few years will increase these numbers more than tenfold. ...
The End of Cosmic Growth

Linder, Eric V.; Polarski, David (NURIS; Energetic Cosmos Laboratory, 2018-10-24)

The growth of large scale structure is a battle between gravitational attraction and cosmic acceleration. We investigate the future behavior of cosmic growth under both general relativity (GR)and modified gravity during ...
Eternal and Evanescent Black Holes: It’s All Done With Mirrors

Good, Michael R.R.; Linder, Eric V. (NURIS; Energetic Cosmos Laboratory, 2017-11-27)

The analogy between black hole radiation and accelerating mirror radiation (the dynamical Casimir effect) is particularly strong for mirror trajectories giving rise to a constant thermal flux of particles. We present new ...
Finite Energy but Infinite Entropy Production from Moving Mirrors

Good, Michael R.R.; Linder, Eric V. (NURIS; Energetic Cosmos Laboratory, 2018-07-20)

Accelerating mirrors provide a simple conceptual laboratory for studying particle production and the relation between trajectory and particle, energy, and entropy fluxes. We focus on the relation between energy and entropy, ...
Gravity’s Islands: Parametrizing Horndeski Stability

Denissenya, Mikhail; Linder, Eric V. (NURIS; Energetic Cosmos Laboratory, 2018-07-31)

Cosmic acceleration may be due to modified gravity, with effective field theory or property functions describing the theory. Connection to cosmological observations through practical parametrization of these functions is ...
GW170817 Most Likely Made a Black Hole

Pooley, David; Kumar, Pawan; Wheeler, J. Craig; Grossan, Bruce (NURIS; Energetic Cosmos Laboratory, 2018-05-14)

There are two outstanding issues regarding the neutron-star merger event GW170817: the nature of the compact remnant and the interstellar shock. The mass of the remnant of GW170817, ∼2.7 M⊙, implies the remnant could be ...
Joining bits and pieces of reionization history

Hazra, Dhiraj Kumar; Paoletti, Daniela; Finelli, Fabio; Smoot, George F. (NURIS; Energetic Cosmos Laboratory, 2019-04-02)

Cosmic Microwave Background temperature and polarization anisotropies from Planck have estimated lower value of the optical depth to reionization (τ) compared to WMAP.
Model independent expansion history from supernovae: Cosmology versus systematics

L'Huillier, Benjamin; Shafieloo, Arman; Linder, Eric V.; Kim, Alex G. (NURIS; Energetic Cosmos Laboratory, 2019-03-05)

We examine the Pantheon supernovae distance data compilation in a model independent analysis to test the validity of cosmic history reconstructions beyond the concordance ΛCDM cosmology. Strong deviations are allowed by ...
Modified Gravity Away from a Lambda CDM Background [Article]

Brando, Guilherme; Falciano, Felipe T.; Linder, Eric V.; Velten, Hermano E. S. (NURIS; Energetic Cosmos Laboratory, 2019-05-01)

Within the effective field theory approach to cosmic acceleration, the background expansion can be specified separately from the gravitational modifications. We explore the impact of modified gravity in a background different ...
No Run Gravity[Article]

Linder, Eric V. (NURIS; Energetic Cosmos Laboratory, 2019-03-05)

Considering the dark energy/gravity landscape if next generation surveys of galaxies, cosmic microwave background radiation, and gravitational waves do not find clear modification of gravity, we develop No Run Gravity as ...
No Slip CMB

Brush, Micah; Linder, Eric V.; Zumalacárregui, Miguel (NURIS; Energetic Cosmos Laboratory, 2018-10-29)

No Slip Gravity is a simple modified gravity theory with only one free function and the interesting characteristic that -- unlike many modified gravity theories -- it suppresses growth. This allows it to fit current redshift ...
No Slip Gravity

Linder, Eric V. (NURIS; Energetic Cosmos Laboratory, 2018-01-04)

A subclass of the Horndeski modified gravity theory we call No Slip Gravity has particularly interesting properties: 1) a speed of gravitational wave propagation equal to the speed of light, 2) equality between the effective ...