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Dark Energy with Phantom Crossing and the H0 Tension. [PDF]

open access: yesEntropy (Basel), 2021
We investigate the possibility of phantom crossing in the dark energy sector and the solution for the Hubble tension between early and late universe observations.
Di Valentino E, Mukherjee A, Sen AA.
europepmc   +3 more sources

The Early Data Release of the Dark Energy Spectroscopic Instrument [PDF]

open access: yesAstronomical Journal, 2023
The Dark Energy Spectroscopic Instrument (DESI) completed its 5 month Survey Validation in 2021 May. Spectra of stellar and extragalactic targets from Survey Validation constitute the first major data sample from the DESI survey. This paper describes the
D. C. A. G. Adame   +263 more
semanticscholar   +1 more source

Validation of the Scientific Program for the Dark Energy Spectroscopic Instrument [PDF]

open access: yesAstronomical Journal, 2023
The Dark Energy Spectroscopic Instrument (DESI) was designed to conduct a survey covering 14,000 deg2 over 5 yr to constrain the cosmic expansion history through precise measurements of baryon acoustic oscillations (BAO).
D. C. A. G. Adame   +260 more
semanticscholar   +1 more source

Survey Operations for the Dark Energy Spectroscopic Instrument [PDF]

open access: yesAstronomical Journal, 2023
The Dark Energy Spectroscopic Instrument (DESI) survey is a spectroscopic survey of tens of millions of galaxies at 0 < z < 3.5 covering 14,000 sq. deg. of the sky.
E. Schlafly   +49 more
semanticscholar   +1 more source

Underdetermination of dark energy [PDF]

open access: yesPhysical Review D, 2023
There is compelling evidence that the Universe is undergoing a late phase of accelerated expansion. One of the simplest explanations for this behaviour is the presence of dark energy. A plethora of microphysical models for dark energy have been proposed.
William J. Wolf, Pedro G. Ferreira
semanticscholar   +1 more source

Overview of the Instrumentation for the Dark Energy Spectroscopic Instrument [PDF]

open access: yesAstronomical Journal, 2022
The Dark Energy Spectroscopic Instrument (DESI) embarked on an ambitious 5 yr survey in 2021 May to explore the nature of dark energy with spectroscopic measurements of 40 million galaxies and quasars. DESI will determine precise redshifts and employ the
B. Abareshi   +266 more
semanticscholar   +1 more source

The Hubble Tension and Early Dark Energy [PDF]

open access: yesAnnual Review of Nuclear and Particle Science, 2022
Over the past decade, the disparity between the value of the cosmic expansion rate determined directly from measurements of distance and redshift and that determined instead from the standard Lambda cold dark matter (ΛCDM) cosmological model, calibrated ...
M. Kamionkowski, A. Riess
semanticscholar   +1 more source

Is local H 0 at odds with dark energy EFT? [PDF]

open access: yesJournal of Cosmology and Astroparticle Physics, 2022
Local H_0 determinations currently fall in a window between H 0 ∼ 70 km/s/Mpc (TRGB) and H 0 ∼ 76 km/s/Mpc (Tully-Fisher). In contrast, BAO data calibrated in an early ΛCDM universe are largely consistent with Planck-ΛCDM, H 0 ∼ 67.5 km/s/Mpc.
Bum-hoon Lee   +4 more
semanticscholar   +1 more source

Carroll Symmetry, Dark Energy and Inflation [PDF]

open access: yesFrontiers of Physics, 2021
Carroll symmetry arises from Poincaré symmetry upon taking the limit of vanishing speed of light. We determine the constraints on the energy-momentum tensor implied by Carroll symmetry and show that for energy-momentum tensors of perfect fluid form ...
J. de Boer   +4 more
semanticscholar   +1 more source

The Dark Energy Survey Data Release 2 [PDF]

open access: yesAstrophysical Journal Supplement Series, 2021
We present the second public data release of the Dark Energy Survey, DES DR2, based on optical/near-infrared imaging by the Dark Energy Camera mounted on the 4 m Blanco telescope at Cerro Tololo Inter-American Observatory in Chile.
Des collaboration   +134 more
semanticscholar   +1 more source

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