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dark energy

This tag is associated with 16 posts

Planck and the Hubble constant: how fast are things flying apart, and what does it mean?

A quick discussion of Planck’s new value of the Hubble constant, as part of our series on the Planck results.

Simulations of Dark matter core formation

The Top 12 of 2012

What were astronomers reading and talking about in their research last year? Check out figures from the top 12 most-cited astronomy papers from 2012 (so far) and find out what researchers were up to and why!

White Dwarf Detonation

Exploding diamonds in the sky

Pakmor et al. propose a new mechanism to make Type 1a supernova explosions from a pair of white dwarfs.

Super-simple supernovae: a simple model for Type Ia light curves

A simple analytical model for the light curves of Type Ia supernovae.

The strength of weak lensing

The Canada-France Hawaii Telescope weak gravitational lensing survey (CFHTLens), recently released new results to help constrain our cosmological models. While still in its early stages, weak lensing will ultimately be a powerful tool to discover the nature of the mysterious dark energy.

WMAP’s Closing Comments: ΛCDM Stands Strong

The final results from the WMAP satellite show agreement with the standard model of cosmology to unprecedented precision.

Gravitational Lensing in the Canary Islands

I recently attended a two-week crash course in the “Astrophysical Applications of Gravitational Lensing”. In this post, I overview a few of the ways astronomers employ lensing to study the Universe, from extrasolar planets to distant quasars and large-scale structure.

An image of galaxy distribution in space, from SDSS

Probing Dark Energy With WFIRST and Euclid

Two upcoming space telescope missions, WFIRST and Euclid, will be able to shed light on the nature of the mysterious dark energy.

Two Telescopes Free To Good Home

Today the National Reconnaissance Office (NRO) announced that it has given NASA not one but two fully-constructed space telescopes, roughly equivalent to Hubble with a wider field of view. The telescopes, which were offered to NASA about a year ago (a team of scientists has been considering whether to accept them in the meantime), come with all their hardware minus instruments – a total value to the agency of hundreds of millions of dollars plus years of lead time.

Gravitational Lensing of the CMB

The South Pole Telescope collaboration detects the effects of gravitational lensing on the cosmic microwave background and derives improved constraints on several cosmological parameters.

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