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websterling
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The Planck 2015 (formerly 2014) Data Release will finally be released to the public tomorrow February 5. Details at-
http://www.cosmos.esa.int/web/planck
http://www.cosmos.esa.int/web/planck
Nice. Now if I only had the time to look at it all.websterling said:The Planck 2015 (formerly 2014) Data Release will finally be released to the public tomorrow February 5. Details at-
http://www.cosmos.esa.int/web/planck
Thank you websterling for that heads-up!websterling said:The Planck 2015 (formerly 2014) Data Release will finally be released to the public tomorrow February 5. Details at-
http://www.cosmos.esa.int/web/planck
Garth said:...I wonder whether Planck 2015 will shed any light on the gravity wave/dust controversy?..
Garth said:I wonder whether Planck 2015 will shed any light on the gravity wave/dust controversy?
My take-away:marcus said:This came out yesterday, caveat lector. Roughly 270 authors are listed (216 plus something over 50).
http://arxiv.org/abs/1502.00612
A Joint Analysis of BICEP2/Keck Array and Planck Data
BICEP2/Keck, Planck Collaborations: P. A. R. Ade, N. Aghanim, Z. Ahmed, R. W. Aikin, K. D. Alexander, M. Arnaud, J. Aumont, C. Baccigalupi, A. J. Banday, D. Barkats, R. B. Barreiro, J. G. Bartlett, N. Bartolo, E. Battaner, K. Benabed, A. Benoit-Lévy, S. J. Benton, J.-P. Bernard, M. Bersanelli, P. Bielewicz, C. A. Bischoff, J. J. Bock, A. Bonaldi, L. Bonavera, J. R. Bond, J. Borrill, F. R. Bouchet, F. Boulanger, J. A. Brevik, M. Bucher, I. Buder, E. Bullock, C. Burigana, R. C. Butler, V. Buza, E. Calabrese, J.-F. Cardoso, A. Catalano, A. Challinor, R.-R. Chary, H. C. Chiang, P. R. Christensen, L. P. L. Colombo, C. Combet, J. Connors, F. Couchot, A. Coulais, B. P. Crill, A. Curto, F. Cuttaia, L. Danese, R. D. Davies, R. J. Davis, P. de Bernardis, A. de Rosa, G. de Zotti, J. Delabrouille, et al. (216 additional authors not shown)
(Submitted on 2 Feb 2015)
We report the results of a joint analysis of data from BICEP2/Keck Array and Planck. BICEP2 and Keck Array have observed the same approximately 400 deg2 patch of sky centered on RA 0h, Dec. −57.5deg. The combined maps reach a depth of 57 nK deg in Stokes Qand U in a band centered at 150 GHz. Planck has observed the full sky in polarization at seven frequencies from 30 to 353 GHz, but much less deeply in any given region (1.2 μK deg in Q and U at 143 GHz). We detect 150×353 cross-correlation in B-modes at high significance. We fit the single- and cross-frequency power spectra at frequencies above 150 GHz to a lensed-ΛCDM model that includes dust and a possible contribution from inflationary gravitational waves (as parameterized by the tensor-to-scalar ratio r). We probe various model variations and extensions, including adding a synchrotron component in combination with lower frequency data, and find that these make little difference to the r constraint. Finally we present an alternative analysis which is similar to a map-based cleaning of the dust contribution, and show that this gives similar constraints. The final result is expressed as a likelihood curve for r, and yields an upper limit r0.05<0.12 at 95% confidence. Marginalizing over dust and r, lensing B-modes are detected at 7.0σsignificance.
Comments: Provisionally accepted by PRL. Data and figures available for download at this http URL and this http URL
My comment: they got a lot of people on board.
websterling said:The Planck site has a nice article about this-
http://www.esa.int/Our_Activities/Space_Science/Planck/Planck_gravitational_waves_remain_elusive
Contrary to what others are reporting, their consensus is that it's mostly dust and microlensing, and that it sets an upper limit on the amount of gravitational waves from inflation- probably no more than about half the observed signal.
It does not, as has been claimed, mean that inflation, gravity waves from inflation, B-mode polarization of the CMB from gravity waves from inflation, or anything else is dead.
Résonaances has just posted his perspective-
http://www.resonaances.blogspot.it/2015/02/b-modes-whats-next.html
That's a really terrible critique. Inflation makes more than just one prediction, and some of those predictions has been borne out by observation.marcus said:Résonaances has a great Monty Python clip about the Taunting Frenchman! Thoughtful comment on the whole affair. The question that Paul Steinhardt raises (including at the Paris December 2014 Planck results conference) is not about inflation being dead, but that it is not science because it accommodates to any and all findings (BICEP or not BICEP, high r or low) with a cheerful cry of "I told you so!
Not dead in other words, just altogether too flexible.
cristo said:It's certainly an impressive amount of work.. and so many papers. It'll take a while to read them all!
One particularly interesting result (and which was hinted at from the joint analysis paper), is that the [itex]m^2\phi^2[/itex] inflation model (the simplest, and the one which fit the previous BICEP data best!) is now disfavored at 3 sigma. But we shall have to wait for the full inflation paper to see what the Planck people have to say.
1. At the frequencies where the CMB is brightest, the small deviations in temperature are *much* brighter than the light from our own galaxy, except very close to the galactic center. Other galaxies further away are all much dimmer than the CMB at these frequencies.Tanelorn said:I just saw this Planck view of the milky way and wanted to ask, if all the galaxies in the U are radiating this much diffuse microwave energy, then how much might this total galaxy microwave output for the whole universe, along with the wide spread of red shifts, contribute to the amplitude of the cmbr measurements? My apologies If this is in the wrong place, I will gladly delete and start a new thread.
http://www.space.com/28478-spectacular-milky-way-maps-planck-images.html
The Planck 2015 Data Release is a collection of data from the Planck satellite, a space observatory operated by the European Space Agency (ESA) that mapped the cosmic microwave background (CMB) radiation, the leftover radiation from the Big Bang. The data release includes measurements of the CMB, as well as other astronomical objects such as galaxies and galaxy clusters.
The Planck 2015 Data Release is significant because it provides the most detailed and accurate measurements of the CMB to date. This data is crucial for understanding the origins and evolution of the universe, as well as testing theories of cosmology and particle physics.
The Planck satellite spent four years (2009-2013) scanning the entire sky at nine different frequencies, using specialized instruments to measure the CMB and other astronomical objects. The data was then processed and analyzed by a team of scientists to create the final data release.
The Planck 2015 Data Release has the potential to confirm or challenge existing theories about the universe, such as the Big Bang theory and inflation theory. It may also provide insights into the nature of dark matter and dark energy, two mysterious components of the universe that make up the majority of its mass and energy.
The Planck 2015 Data Release is publicly available and can be accessed through the ESA's Planck Legacy Archive. Scientists can use this data to conduct their own research and analysis, and it is also available for educational and outreach purposes to increase public understanding of the universe.