Archive for February 15, 2017

How Time Passes

Posted in Jazz with tags , , , on February 15, 2017 by telescoper

I don’t seem to have had much time recently to post any lengthy pieces about music, and today is no exception, but I couldn’t resist sharing this fascinating title track from the album How Time Passes which was recorded in New York City in October 1960. It features Don Ellis on trumpet and  Jaki Byard on piano (with Ellis doubling on piano sometimes to allow Byard to play saxophones) along with Ron Carter on bass and Charlie Persip on drums. The album is a fascinating collection of modern jazz performances informed by  contemporary classical music, a blend that came to be known as Third Stream. This track is particularly unusual because of its elastic approach to tempo – it is constantly speeding up and slowing down in a way that makes you wonder how the band stays together – but it also features some beautiful work on trumpet by Don Ellis.


P.S. As well as being a superb jazz musician, Don Ellis was also a fine composer. Among other things he wrote the theme music for the film The French Connection. Not a lot of people know that.



Cosmological Parameters from pre-Planck CMB Measurements: a 2017 Update [CEA]

Posted in The Universe and Stuff on February 15, 2017 by telescoper

Via arXiver, here’s a nice summary of the (strong) constraints on cosmological parameters that can be achieved from Cosmic Microwave Background experiments other than Planck. This is an important thing to do for a number of reasons, including that it might reveal interesting systematic differences between pre- and post-Planck data which merit further study.

The first author of this paper, Erminia Calabrese, will be joining us on the staff of the School of Physics & Astronomy at Cardiff University in May 2017!


We present cosmological constraints from the combination of the full mission 9-year WMAP release and small-scale temperature data from the pre-Planck ACT and SPT generation of instruments. This is an update of the analysis presented in Calabrese et al. 2013 and highlights the impact on $Lambda$CDM cosmology of a 0.06 eV massive neutrino – which was assumed in the Planck analysis but not in the ACT/SPT analyses – and a Planck-cleaned measurement of the optical depth to reionization. We show that cosmological constraints are now strong enough that small differences in assumptions about reionization and neutrino mass give systematic differences which are clearly detectable in the data. We recommend that these updated results be used when comparing cosmological constraints from WMAP, ACT and SPT with other surveys or with current and future full-mission Planck cosmology. Cosmological parameter chains are publicly available on the NASA’s LAMBDA data archive.

Read this…

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