Today on the arXiv: Light echo gives insight into SNIa dust environment

Posted on Oct 12, 2016 in astro-ph, Research, universe

I noticed this interesting paper using high resolution, multi-epoch images from Hubble to study the time evolution of the aftermath of the explosion of SNIa SN204J, which went off in 2014 in the nearby galaxy M82 (a mere 11 million light years away). The data show the presence of a radially expanding light echo, as well […]

Today on the arXiv: how to measure the intrinsic CMB dipole, and radio emission from DM in the Coma cluster

Posted on Oct 6, 2016 in astro-ph, Research, Science

Elena Pierpaoli and her collaborator Slavash Yasini come up with a clever way of measuring the intrinsic CMB dipole, and disentangling it from the much bigger dipole induced by the Earth motion with respect to the CMB rest frame. The key idea is that leakage of the intrinsic dipole into the monopole and quadrupole induces […]

Today on the ArXiv: How to ride a light beam to the stars, and how not to analyse distance indicators

Posted on Oct 3, 2016 in astro-ph, News, Research, Science

Today on the arXiv, a nice analysis of how to design a solar sail in such a way that the light beam powering it is prevented from rocking it side to side, and hence destabilising it. The key idea is to use a spherical sail (rather than conical designs as previously proposed) and a multi-modal laser […]

Today on the arXiv: Prospector-alpha opens the way to high-accuracy photometry-based estimation of galactic properties

Posted on Sep 30, 2016 in astro-ph, Research, Science, universe

There is a terrific paper on today’s arXiv: The Prospector-alpha code is an impressive new approach to estimating a large number of important physical parameters of galaxies, including indicators for the galaxy’s star formation history, its metallicity, its mass and dust content. The code contains a large number of free physical parameters (describing star formation […]

Today on the arXiv: from light bulbs to 2 trillion dark matter particles simulations in 75 years

Posted on Sep 29, 2016 in astro-ph, News, Research

Today, Martin White suggests using a density-dependent correlation function as a tool to help distinguish General Relativity from modified gravity theories. The N-body simulation Zurich group shows impressive results from a cosmological simulation involving 2 trillion (2 x 10^12) particles, which they run on the Swiss Supercomputer in Manno using GPU-accelerated nodes, and benchmarked with […]

Bad news for LISA and Dark Matter line emission from the Galactic Centre

Posted on Sep 27, 2016 in astro-ph, Research

Today on the arXiv (arXiv:1609.08093) Camille Bonvin and collaborators (whom I know well from my days in Geneva) rule out the possibility to use the distortion in the gravitational waves chirp signal to measure the acceleration of the universe. They find that the peculiar acceleration is much greater and therefore would (1) wash out the […]

Papers of interest on the arXiv today – Sept 26th 2016

Posted on Sep 26, 2016 in astro-ph, Bayes, Research

Two interesting papers on the methodology side today: A ML source detection method that detects ultra-faint streaks below the pixel level noise (arXiv:1609.07158). They call it “ML” but in reality it uses MCMC to look at the Bayesian posterior (which is arguably a good thing!) and even Bayesian model comparison (in the BIC variety) to determine […]

PhD projects for Oct 2014 entry

Posted on Feb 10, 2014 in Research, Teaching

For details about funding and how to apply, please visit this page. 1) Direct detection of dark matter and global fits  Identifying the nature of the dark matter (DM) that inhabits the Universe is arguably the most compelling undertaking in astrophysics and particle physics today. Current searches for DM include: – The Large Hadron Collider (LHC) at […]