- Cosmo-torun - cosmo.torun.pl

Diffusion PNCG, mess. n° 6 (fwd)
by Boud Roukema 27 Mar '09

27 Mar '09

hi all some interesting announcements pozdr boud > > ---------- Forwarded message ---------- > Date: Thu, 26 Mar 2009 16:46:49 +0100 > From: Programme National de Cosmologie et Galaxies <pncg iap.fr> > To: Programme National de Cosmologie et Galaxies <pncg iap.fr> > Subject: Diffusion PNCG, mess. n° 6 > > PNCG - Message n° 6 - 26 mars 2009 > > 1. Oxford Physics Department 2 Jobs Advert > > 2. NAM/JENAM 2009 : Epoch of Reionisation Session > > 3. Blois 2009 > > 4. Santa Fe Cosmology Summer Workshop for 2009 > > 5. Summer School in Statistics for Astronomers, June 1-6, 2009 > > ----------------------------------------------------------------------- > 1. Oxford Physics Department 2 Jobs Advert > > Please visit http://www.physics.ox.ac.uk/jobs/ to view this. > > *1* Vacancy Title: Post-doctoral Researchers in OBSERVATIONAL COSMOLOGY > within Astrophysics > > Reference Number: DB09005 > > Job Description: The Department of Physics invites applications for one > or more post-doctoral positions in observational cosmology. > > The observational cosmology programme at Oxford includes: the analysis > of surveys for type Ia supernovae; analysis of large-area surveys of > weak gravitational lensing incorporating photometric redshift estimation; > and the design and implementation of upcoming redshift surveys to measure > baryonic oscillations. We especially welcome applications from candidates > interested in working on any of these projects. > > The post-holder will have the opportunity to engage in teaching for up > to 3 hours per week during term. The starting salary is from £28,839 > to £38,757 pa depending on skills and experience. A benefits package > and a research budget for travel and other expenses will be provided. > Appointments will be for two years in the first instance, extendable > to three years. Appointments would start on 1 May 2009 or later. > > Further particulars are available from > http://www.physics.ox.ac.uk/astro/jobs/ > Applicants should send a statement of research interests, > curriculum vitae, list of publications (one file only in pdf), > and the names and addresses of three referees by the closing date > of 31 March 2009, quoting reference DB09005. Email submission is > preferred. Please ensure that the reference number DB09005 is > included in the subject title. In addition candidates should arrange > for letters from the referees to be sent to sec astro.ox.ac.uk by the > closing date. Interviews are expected to be held shortly after. > > > The University is an equal opportunity employer > > > Anyone who thinks they may be interested in the job is encouraged > to talk to Vanessa Ferraro-Wood (or email: sec astro.ox.ac.yuk) about it. > > The application deadline is 31/03/2009 > > > *2* Vacancy Title: Postdoctoral Researcher in Theoretical Cosmology > (Fixed Term) within Astrophysics > > Reference Number: DB09006 > > Job Description: We invite applications for a postdoctoral research > position starting 1 October, 2009 to work in the area of Theoretical > Cosmology for one year in the first instance, with the possibility of > extending to 3 years. There will be a particular focus on cosmic > microwave background anisotropy and interpretation of data from the > Atacama Cosmology Telescope and the Planck satellite. The successful > candidate is likely to have experience in analysis of cosmological data > and be capable of initiating research in a lively group with significant > interaction between theory and observation. The candidate will work > primarily with Joanna Dunkley, but will be encouraged to interact with > other faculty members and to carry out independent research. > > Oxford Astrophysics offers a stimulating research environment, with a > large number of faculty in cosmology, including theoretical (Pedro > Ferreira, Joe Silk, Adrianne Slyz), observational (Richard Ellis, Steve > Rawlings, Isobel Hook, Lance Miller) and experimental (Mike Jones, > Ghassan Yassin, Gavin Dalton). > > > Anyone who thinks they may be interested in the job is encouraged to > talk to Dr Joanna Dunkley (or email: j.dunkley1 physics.ox.ac.uk) about > it. > > > The application deadline is 31/03/2009 > > > ----------------------------------------------------------------------- > 2. NAM/JENAM 2009 : Epoch of Reionisation Session > > As part of the 2009 UK National Astronomy Meeting & the Joint European > National Astronomy Meeting at the University of Hertfordshire > (www.jenam2009.eu) there will be a parallel session on > > "Epoch of reionisation: > first light to the earliest galaxies currently known" > > on Monday 20th April 2009. > Please see www.jenam2009.eu/default.asp?ContentID=1327 > for more information. > > We would welcome submission of abstracts for this session by the > deadline on Monday March 9th. > > Registration and abstract submission is available at > www.jenam2009.eu/cmsapps/jenam_conference_reg/ > confreg2.asp?userid=0&confid=4&contentid=1329 > > ----------------------------------------------------------------------- > 3. Blois 2009 > > The XXIth Rencontres de Blois entitled "Windows on the Universe" > will be held from June 21st to June 26th, 2009 > in the Château de Blois, Loire Valley, France. > > This series, started in 1989 with the celebration of the > 25th anniversary of the discovery of CP violation, is a > high level cross disciplinary conference series which is > organized every year in May or June in the beautiful > Renaissance castle of Blois. > > This year will be the 20th anniversary of this series of > conferences; moreover, 2009 has also been tagged as the > "World year of astronomy". > To celebrate these two events, 7 Nobel laureates : J.Cronin, > R. Giacconi, D. Gross, M. Perl, G. Smoot, J. Steinberger, > J. Taylor and many other well known scientists have accepted > our invitation to attend and give a lecture. > > Registration and abstract submission for parallel session talks > are open at http://blois.in2p3.fr > > ----------------------------------------------------------------------- > 4. Santa Fe Cosmology Summer Workshop for 2009 > > The next of our continuing series of Santa Fe Cosmology Summer workshops > will be held in Santa Fe, New Mexico from July 6 to July 24, 2009. > The workshop series is sponsored by Los Alamos National Laboratory and > by the Kavli Institute for Cosmological Physics at the University of > Chicago. The venue is the campus of St. John's College, a small liberal > arts college that provides both a pleasant ambiance and convenient access > to Santa Fe. > > The aim of the Santa Fe workshops is to bring together physicists and > astrophysicists with interests in structure formation, the cosmic > microwave background, and the early universe. Typically, a large > portion of the time is devoted to discussion, with formal or informal > talks as needed to introduce such discussion. Attendance is limited > to about 80 participants to encourage this informality. We also > encourage attendance by a number of graduate students and junior > researchers, so they can be exposed to forefront research and interact > with leaders in the field. We therefore ask you to bring this meeting > to the attention of exceptional students and postdocs. > > This year, the first two weeks will follow our standard workshop > format, while the third week will be a focused workshop on weak > lensing. Details on third week activities will be available shortly. > > There will be no registration fee and highly subsidized housing will > be provided (the precise cost estimates will be available soon, but > are typically $150/week, less for students). Travel support will not > be available. > > To register for the meeting and to make suggestions for the scientific > program, go to the Workshop website at > > http://www.lanl.gov/projects/cosmology/sf09/ > > We will be filling spaces on a rolling basis, so you are strongly > advised to register as soon as possible, and preference will be given > to those who register before April 08, 2009. > > ----------------------------------------------------------------------- > 5. Summer School in Statistics for Astronomers, June 1-6, 2009 > > First Announcement > > Summer School in Statistics for Astronomers V > June 1-6, 2009 > Penn State University > http://astrostatistics.psu.edu/su09/ > > The fifth annual Penn State Summer School in Statistics for > Astronomers will be held at Penn State. This is a 6-day course > in fundamental statistical inference designed to provide > physical scientists, particularly young researchers in astronomy, > with a strong conceptual foundation in modern statistics and to > develop a repertoire of well-established techniques applicable > to observational astronomy. Classroom instruction is interspersed > with hands-on analysis of astronomical data using the public-domain > R software package. The course is taught by a team of statistics > and astronomy professors with opportunity for discussion of > methodological issues. > > Statistical techniques covered include: > > * exploratory data analysis > * hypothesis testing and parameter estimation > * regression & confidence interval estimation > * model selection & goodness-of-fit > * maximum likelihood methods & Bayes' Theorem > * non-parametric methods > * Monte Carlo methods > * Poisson processes > * time series analysis > > INTERESTED PARTICIPANTS SHOULD REGISTER AT > http://astrostatistics.psu.edu/su09/reg.html > REGISTRATION DEADLINE: May 1, 2009 > (or when the enrollment limit reaches) > REGISTRATION FEE: $250. > > The 2009 Summer School is organized by Penn State University's > Center for Astrostatistics. It will be modeled on the last four Penn > State Summer Schools and the 2008 Indian Institute of Astrophysics- > Penn State Summer School. See http://astrostatistics.psu.edu/ > for past lecture notes. This Web site > http://astrostatistics.psu.edu/su09/ > also gives information on travel, lodging, and visas. >

1 0

cosmo workshop wt 14:00 20.01.09 B Lew: 'A high significance foreground non-Gaussian signal ?'
by Boud Roukema 25 Feb '09

25 Feb '09

witam, Cosmo workshop tomorrow wtorek 20.01.09 at 14:00 @KRA. Bartek Lew will talk about his present project: 'A high significance foreground non-Gaussian signal ?' Everyone is welcome, but be warned: this is a research level work session, most likely in English. pozdr boud

2 6

200-bit precision floating point arithmetic and trigonometry?
by Boud Roukema 03 Feb '09

03 Feb '09

hi cosmo-torun, This follows from a conversation some of us had recently. Debian stable (etch) includes GMP and MPFR - i ran a test program which quite nicely does e.g. 200-bit floating point operations, including trig functions, and gets reasonable answers. :) Source + doc: http://gmplib.org/ http://www.mpfr.org/ These are both under the LGPL instead of the GPL, so it turns out that... the non-free program Mathematica uses the free program GMP ! So apparently non-free software libraries are not good enough for Mathematica for this purpose. Or Mathematica is just "abusing the commons". [the commons: http://en.wikipedia.org/wiki/The_commons ] pozdr boud On Wed, 14 Jan 2009, Bartosz Lew wrote: >>> But within standard types long double is better than double etc. >> >> i assume this means you've experimented with this? Based on the >> wikipedia entries, i suggested to Zbyszek that this could be >> interesting, but i haven't tried it. My understanding is that it >> pushes to the limit of the machine you're using, which can be better >> than 64bit, but is nowhere near 128bit. :) > > mmm, don't remember which means that probably not much. > > But, I never experienced a need for such extremely super-duper high accuracy. > As far as the calculation is actually correct within the given precision it's cool. > Eg. CMBFast works in 4byte float numbers and it's sufficient. > AFAIK people still very often use 4byte floats. > My opinion is that is the code returns wrong numbers its an indication that it should be rewritten > in smarter way rather than going to long doubles or quadruple precisions. > >> >> Tomorrow Thursday i've got linux@IF so i'm very unlikely to be at >> KRA. But that's not an argument against both of you coming here and >> doing stuff. :) > > ok. > > B. >

1 0

Diffusion PNCG, mess. No 3 (fwd)
by Boud Roukema 30 Jan '09

30 Jan '09

witam some of these may be interesting pozdr boud ---------- Forwarded message ---------- > Date: Fri, 30 Jan 2009 16:03:39 +0100 > From: Programme National de Cosmologie et Galaxies pncg iap fr > To: Programme National de Cosmologie et Galaxies pncg iap fr > Subject: Diffusion PNCG, mess. n° 3 PNCG - Message n°3 - 30 janvier 2009 1. postdoc position at LPNHE 2. Invisible Universe International Conference 3. POSTDOCTORAL FELLOWSHIP in instrumentation at the Institut d'Astrophysique Spatiale d'Orsay (IAS) 4. Journées asa/alma (6 et 7 avril 2009 à Grenoble) : dernière annonce 5. Post-doctoral fellowship at LAM (Marseille-France) on Herschel Extragactic Key Projects ----------------------------------------------------------------------- 1. postdoc position at LPNHE The Laboratoire de Physique Nucleaire et des Hautes Energies de Paris (LPNHE, CNRS/IN2P3 and University of Paris) invites applications for a post-doctoral position in Observational Cosmology. The position is for 2 years starting on October 1st 2009, or earlier, with a possible extension of 1 year, contingent on funding. The researcher will work within the Supernova & Cosmology group of LPNHE (http://supernovae.in2p3.fr) primarily on the measurement of Dark Energy using Type Ia supernovae. The work will focus on analyzing the high-quality supernova data sets recently obtained by the Supernova Legacy Survey and the Nearby Supernova Factory projects, in which the LPNHE group is strongly involved, as well as on the combination of these data sets with other large supernova data sets such as obtained by the SDSS-II. The candidate is expected to have a PhD in Physics or Astrophysics and expertise in data analysis (not necessary supernova cosmology) and interpretation. Applications (CV, research statement and names of 3 referees) should be sent by email to Reynald Pain (reynald.pain lpnhe in2p3 fr). Applicants should also arrange for up to three letters of reference to be sent to the same address. The closing date is February 15, 2009. ----------------------------------------------------------------------- 2. Invisible Universe International Conference The LUTh (« Universe and Theory Laboratory » - CNRS UMR 8102, Paris Observatory), in collaboration with UNESCO and several national and international institutes organizes the « Invisible Universe International Conference » in Paris (France) from June 29 to July 3, 2009 at the Palais de l?UNESCO. The conference intends to bring together all scientists working on the various aspects of dark energy, dark matter and gravity modification and their connection to cosmological observations and fundamental physics. The list of invited speakers is completed: L. Amendola (Italy), A. Ashtekar (USA), L. Bergstrom (Sweden), Ed. Bertschinger (USA), P. Binetruy* (France), F. Combes (France), A. Connes (France), Ed. Copeland (UK), G. Dvali (Switzerland), P. Fayet (France), D. Gross (USA), F. Hammer (France), S. Katsanevas (France), E. Kolb (USA), O. Le Fevre (France), Y. Mellier (France), M. Milgrom (Israel), T. Padmanabhan (India), J. Peebles (USA), J.-L. Puget (France), A. Riess (USA), G. Smoot (USA). L. Susskind (USA), E. Wright (USA). 8 parallel sessions are organized as an international workshop such that every oral presentation is expected to be about twenty-five minutes. 1) Observational Astrophysical Aspect of dark energy and dark matter 2) Experimental particle physics aspects of dark matter 3) Gravitation and cosmology 4) Inhomogeneous universe models and backreaction 5) Dark energy as a new energy component 6) Dark matter candidates 7) Dark Matter and Dark energy as modified gravity 8) Theoretical and numerical aspects of cosmic structures and evolution THE REGISTRATIONS ARE NOW OPEN, THE CONTRIBUTED TALKS ARE WELCOME. We would be very grateful if you can also disseminate widely the information among your colleagues and students. For further information, please see the following web and e-mail adresses : http://universe2009.obspm.fr meeting.univ2009 obspm fr ----------------------------------------------------------------------- 3. POSTDOCTORAL FELLOWSHIP in instrumentation at the Institut d'Astrophysique Spatiale d'Orsay (IAS) A new generation of scintillating bolometers for EURECA Contact: Pierre de Marcillac (marcillac ias u-psud fr) STAP team (Thermal Spectroscopy for Physics and Astrophysics) Deadline for application: february 23th 2009. Job starts: at a date to be defined with the candidate (typically september or october 2009, but with some flexibility between june and december 2009). Funding is available for 2 years (*) Research topic: EURECA is a European project, still in a design study phase, dedicated to the direct detection of dark matter particles (neutralinos) with cryogenic detectors underground (see http://www.eureca.ox.ac.uk/) Cross sections of neutralino candidates with nucleons in the targets as low as 10-10pbarn are foreseen -hence two orders of magnitude better than the best actual achievements- implying close to one ton of detectors. While EURECA design will be strongly influenced by the results of the two big european underground experiments CRESST and EDELWEISS, the project also incorporates experienced teams involved in the direct dark matter detection with bolometers or with very low radioactivity techniques at a research and development phase. The IAS team is just one of them, improving since 1994 the so-called scintillating bolometer technique and applying it to different targets. Scintillating bolometers cooled at temperature lower than 20mK are planned to be used within EURECA, for their ability to explore the huge uncertainties encountered in the constitution of the neutralino itself, while being able to susbstract efficiently in a single experiment all the systematics associated with an experiment dealing with very rare events. The massive detectors built by the IAS team since 1994 proved to be able to reject most of the radioactive background during tests performed either at IAS at sea level, or underground within the EDELWEISS or ROSEBUD experiments. Though, improvements are needed in view of the EURECA project: a simpler construction design, making more easy a future serial production of detectors, has to be looked for. Configurations similar to already existing ones (as the ones used by the EDELWEISS collaboration,...) could be explorated. much less radioactive Ge-NTD sensors, -our common thermistors- with respect to the existing ones are highly desirable. At low energy, where the expected signals is high, there is confusion with noise. Time constants criteria are no longer useful to distinguish among the non-ionizing events between the good events (recoiling nuclei) and the bad ones, decays in the Ge-NTD sensors, these latter being usually faster. At high energy, such decays could also be highly confusing at slow (some hundred of Hz) sampling rates, which are the ones used today in EDELWEISS and probably later by EURECA. It is hoped that, going from much purer germanium material as initial material, we should avoid unwanted radioactive impurities in the sensors. Such activated "impurities" are normally produced after exposure in the nuclear reactor used to transmuted part of the raw material (Ge) into the desirable doping elements. fast neutron detectors, a solution to measure the rarest fast neutrons remaining inside the dark matter experiments shieldings will help a lot in estimating their contribution to the observed rate of recoiling nuclei in the detectors. Fast neutrons, through their elastic scattering, are the ultimate background in experiments dealing with direct detection, but as well in other experiments looking for very rare events: a consequence of their strong penetration power. Simulations of shielding efficiencies are the normal tools used to estimate such a contribution, but we think that one should try also to measure this important contribution by in situ measurements when dealing with very low event rates. It was proposed recently to use the neutron capture reaction by 6Li in lithiated detectors (as massive 6LiF bolometers) to measure in a straightforward way the energy of fast neutrons in the 10keV-10MeV range. The post-doctoral fellow will work preferentially on these three topics at IAS, in collaboration with teams at CEA-IRFU-SEDI or at CNRS-CSNSM working within the EDELWEISS collaboration. Selection criteria: The succesfull candidate is expected - to hold a relevant PhD (in physics, astrophysics or astroparticle physics). - to be able to demonstrate the capacity to carry out independent high quality research in a related area. - to have experience in instrumentation at very low temperature with massive bolometers (particle detection) Preferences will be given to candidates hosted by the institutions participating in the EURECA project. Salary: The annual gross salary will be of 25 600 euros (2130 euros per month). How to apply: Send a CV, a complete list of publications, and a statement of research interests to Pierre de Marcillac (marcillac ias u-psud fr) (deadline, february 23th), and arrange to have letter(s) of recommendation sent by the same date. Electronic applications can be sent in pdf, ps, or word format. (*) This grant has been made available thanks to the the P2I (Physique des 2 Infinis) networking structure, joining research institutions within the Paris & Ile de France region (see http://events.lal.in2p3.fr/P2I/) ----------------------------------------------------------------------- 4. Journées asa/alma (6 et 7 avril 2009 à Grenoble): dernière annonce L'Action Spécifique ALMA organise à Grenoble deux jours de travail (les lundi et mardi 6 et 7 avril 2009) au cours desquels la communauté discutera de la manière dont elle souhaite s'organiser autour d'ALMA. Toutes les informations sont à jour (avec une première ébauche du programme) à l'adresse suivante : http://www.graal.univ-montp2.fr/hosted/alma/ALMA2009.html Ces journées permettront 1) de recenser les équipes qui préparent déjà scientifiquement ALMA et 2) de faire dialoguer les radio-astronomes avec ou sans expertise en interférométrie avec des observateurs venant d'autres domaines de longueur d'onde, des modélisateurs, des fournisseurs de données micro-physiques nécessaires à l'analyse des données, etc... Attention : les dates de clôture des inscriptions et de l'appel à contribution ont été changées. Elles sont maintenant toutes les deux fixées au vendredi 13 février 2009 au soir. ----------------------------------------------------------------------- 5. Post-doctoral fellowship at LAM (Marseille-France) on Herschel Extragactic Key Projects Applications are invited for a Postdoctoral Research Fellow position with Dr. A. Boselli and Pr. V. Buat within the team "Physique des Galaxies" at Laboratoire d'Astrophysique de Marseille to work on the Key Insights of Herschel Guaranted Time Key Projects devoted to extragalactic astronomy. The successful applicant will be involved with the reduction and analysis of photometric data obtained with the PACS and SPIRE instruments. The successful applicant will be able to work on one of the following Herschel Guaranted Time Key Projects: the Herschel Reference Sample (HRS) and the Herschel Multi-tiered Extragalactic Survey (HerMES). HRS consists of a far-IR survey (250, 360, 520 microns) of a complete, K band selected, volume limited sample of 323 galaxies in the nearby universe. Combined with data at other wavelengths (from UV to radio centimetric) this sample will be used to study the physical properties of the interstellar medium (dust, gas, radiation field...) of galaxies spanning a large range in morphological type and luminosity with the aim of understanding the star formation process and the matter cycle in galaxies. HerMES consists of a large set of fields observed in several photometric bands from 70 to 550 microns with Herschel SPIRE and PACS with an unprecedented depth and spatial coverage. These data combined with ancillary surveys will give the first complete view on the evolution of galaxies over cosmological time giving access to the entire star formation occuring in the universe. The specific interest of our team will be to study the evolution of dust attenuation and star formation activity with redshift through the fitting of spectral energy distributions. Research experience in extragalactic studies with an emphasis on star-forming galaxies and infrared emission is desired. Experience with the reduction and photometric measurement of space-based data will be appreciated. Candidates should have obtained, by the starting date, a Ph.D. in Astronomy, Physics, Astrophysics, or equivalent. The appointment is for one year possibly renewable starting on September 1, 2009. To apply, please send resume, publication list, and statement of research to the address below and have three letters of reference forwarded to the same address. The deadline for applications is May 1, 2009. for informal inquiries:veronique.buat oamp fr, alessandro.boselli oamp fr

1 0

Grassmannian Conference in Fundamental Cosmology Szczecin 14-19.09.09 (fwd)
by Boud Roukema 16 Jan '09

16 Jan '09

---------- Forwarded message ---------- > Date: Fri, 16 Jan 2009 12:00:56 +0100 (CET) > From: Mariusz Dabrowski mpdabfz wmf.univ.szczecin.pl > To: Boud Roukema: ; > Subject: Grassmannian Conference in Fundamental Cosmology Szczecin 14-19.09.09 Szanowni Panstwo, Pragne przypomniec, ze w dniach 14-19.09.2009 Szczecinska Grupa Kosmologiczna organizuje konferencje Grasscosmofun'09 (Grassmannian conference in Fundamental Cosmology). Informacje na temat konferencji znajduja sie na stronie: http://cosmo.fiz.univ.szczecin.pl Zapraszamy zainteresowanych czlonkow sieci do udzialu. Rejestracja odbywa sie online. W imieniu Komitetu Organizacyjnego, Mariusz P. Dabrowski Instytut Fizyki Uniwersytet Szczecinski

1 0

cosmo workshop @14.00 Fri 12.12.2008 @KRA by Bartek Lew
by Boud Roukema 11 Dec '08

11 Dec '08

hi cosmo-torun, cosmo workshop @14.00 Fri 12.12.2008 @KRA by Bartek Lew We are starting a series of work meetings: mainly me + Bartek/Agnieszka/Zbyszek. People who are not yet at research level (e.g. younger students) or non-cosmologists are welcome to come along, but the main idea is not only to inform others what we are doing, but hopefully also to make concrete advances in our actual research projects. If i remember correctly, last time we had a meeting like this, Andrzej Marecki came up with an excellent, original idea, so sub-CMB extragalacticians are certainly welcome. i think Bartek's idea is right: if each of us presents our work once a month, then that makes for a meeting every week. With the 4 of us thinking together, along with undergraduate students with different levels of interest and AGN people making useful comments, i think we have the potential to make a real cosmology group. :) Anyway, see you all Friday. :) pozdr boud

2 2

TODAY!! TODAY!! seminar on PDS (mostly 0801.0006) @KRA 10.15 Fri 24.10.2008
by Boud Roukema 23 Oct '08

23 Oct '08

hi cosmo-torun, Sorry for the late warning, but i'm not the organiser of KRA seminars! So the plan now is: "Ksztalt Wszechswiata" = seminar on PDS @KRA 10.15 Fri 24.10.2008 = today if you read your email daily. The content will be mostly on http://arXiv.org/abs/0801.0006 since i just read the email confirming what i thought had been put off to some unknown date until just a few minutes ago. That should be enough for a decent presentation and discussion in any case, IMHO. :) As usual, i imagine a poster was put up in KRA just yesterday Thursday, with no email reminder on our KRA internal mailing list.... pozdr boud

1 0

Benasque - Glenn Starkman's presentation on S_xi approx 0
by Boud Roukema 08 Aug '08

08 Aug '08

hi cosmo-torun, Monday morning and afternoon discussion at Benasque were especially interesting for us! Glenn Starkman pointed out how important the observed S_{1/2} approx 0 is. (Spergel et al 2003 definition of S_{1/2}, which we calculate with a slightly different version, S_xi in our new paper http://arXiv.org/abs/0807.4260 ) He argues that this was already noticed in *COBE* data. Some of his talk is probably in: http://arxiv.org/abs/astro-ph/0605135 He pointed out that it's not just low C_2 and C_3 which give low S_{1/2}. In fact, at least up to C_5 is needed. Also, for a cosmic concordance infinite flat model, there needs to be a conspiracy between the various low l's in order that *all* of them are sufficiently low in order that the result is a low value of S_{1/2}. The main suggestion from his talk to explain this was the general approach at making a relativistic version of MOND - TeVeS - rather than cosmic topology - but the Aurich et al. PDS simulations suggest that the PDS is a good candidate for resolving the "Missing Fluctuations" problem. On Tuesday, Dominik Schwarz gave a very thorough talk on the Averaging Problem. Some rough notes and/or pointers to speakers' articles which should more or less match their talks are on the twiki: http://cosmo.torun.pl/Cosmo/BenasqueNotes2008 pozdr z gor Pyrenees :) boud

2 1

On the most accurate ILC CMB map to date.
by Bartosz Lew 08 Jul '08

08 Jul '08

Hi cosmo-torun, http://adsabs.harvard.edu/cgi-bin/bib_query?arXiv:0807.0773 is the work on the new the most accurate (as claimed) ILC method for producing clean CMB maps to date. The map is also available to download. best, Bartek

2 1

http://arxiv.org/ps/0806.4493v1
by Bartosz Lew 07 Jul '08

07 Jul '08

Hi all, Who believes in the results of this work ? http://arxiv.org/ps/0806.4493v1 It's certainly disturbing, provocative interesting and intriguing. On the other hand all the technical stuff of the WMAP pipeline has been very well tested and all the systematics/foregrounds well constrained. regards, Bartek

1 0