7,370 research outputs found
Precision cosmology from future lensed gravitational wave and electromagnetic signals
The standard siren approach of gravitational wave cosmology appeals to the
direct luminosity distance estimation through the waveform signals from
inspiralling double compact binaries, especially those with electromagnetic
counterparts providing redshifts. It is limited by the calibration
uncertainties in strain amplitude and relies on the fine details of the
waveform. The Einstein Telescope is expected to produce
gravitational wave detections per year, of which will be lensed. Here
we report a waveform-independent strategy to achieve precise cosmography by
combining the accurately measured time delays from strongly lensed
gravitational wave signals with the images and redshifts observed in the
electromagnetic domain. We demonstrate that just 10 such systems can provide a
Hubble constant uncertainty of for a flat Lambda Cold Dark Matter
universe in the era of third generation ground-based detectors
Dynamical correlations and screened exchange on the experimental bench: spectral properties of the cobalt pnictide BaCo2As2
Understanding the Fermi surface and low-energy excitations of iron or cobalt
pnictides is crucial for assessing electronic instabilities such as magnetic or
superconducting states. Here, we propose and implement a new approach to
compute the low-energy properties of correlated electron materials, taking into
account both screened exchange beyond the local density approximation and local
dynamical correlations. The scheme allows us to resolve the puzzle of BaCo2As2,
for which standard electronic structure techniques predict a ferromagnetic
instability not observed in nature.Comment: 6 pages, 4 figures + Supplementary materia
A Note on Chiral Symmetry Breaking from Intersecting Branes
In this paper, we will consider the chiral symmetry breaking in the
holographic model constructed from the intersecting brane configuration, and
investigate the Nambu-Goldstone bosons associated with this symmetry breaking.Comment: 16 pp, minor changes, to appear PR
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