Cosmo-torun May 2004

cosmo-torun@cosmo.torun.pl

6 participants
5 discussions

paper formally accepted
by Boud Roukema 31 May '04

31 May '04

Hi, our topology paper has now been formally accepted by A&A. :) Hopefully there'll be some new stuff ready in a week or so to start thinking about the followup paper. pozdr boud

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Whipple + CANGAROO-II - Re: DM from INTEGRAL satellite? - Rencontres Cosmologie-Astroparticule-Gravitation: Integral voit-il la matičre noire ? (fwd)
by Boud Roukema 26 May '04

26 May '04

Witam, Annihilating dark matter from TeV photons from Whipple + CANGAROO-II ? Or is it just from 3EG J1746-2851 (EGRET source)? This is from a much smaller length scale around the GC - a few tens of parsecs, *not* 1 kpc - compared to what seem to be the INTEGRAL results. http://arxiv.org/abs/astro-ph/0404205 Have Atmospheric Cerenkov Telescopes Observed Dark Matter? Authors: Dan Hooper, Ignacio de la Calle Perez, Joseph Silk, Francesc Ferrer, Subir Sarkar pozdr boud On Mon, 10 May 2004, boud wrote: > Discovery of dark matter by INTEGRAL? > > > ---------- Forwarded message ---------- > > Date: Mon, 10 May 2004 19:10:55 +0200 (MET DST) > > From: Luc Blanchet <blanchet at iap.fr> > > To: users_all at iap.fr > > Subject: [X-UNKNOWN] Rencontres Cosmologie-Astroparticule-Gravitation: > > Int[X-UNKNOWN] egral voit-il la matičre noire ? > > > > > > Nous vous annonçons la seconde édition des rencontres d'Ile de France : > > Cosmologie-Astroparticule-Gravitation: > > http://cdfinfo.in2p3.fr/~bouquet/CAG.html > > > > ======================================== > > le 18 mai 2004 de 14h ŕ 18h > > Amphithéâtre de l'Institut d'Astrophysique de Paris > > 98bis, Bd Arago - 75014 Paris > > ========================================= > > > > > > ============================ > > INTEGRAL voit-il la matičre noire ? > > ============================ > > Does INTEGRAL see dark matter? > > > > > Résumé: > > ------------ > > Les récentes observations menées par le satellite INTEGRAL dans le > > domaine des rayons gamma confirment l'émission d'un rayonnement > > d'annihilation de paires électrons-positrons extręmement intense dans > > les régions centrales de la Galaxie. La résolution angulaire et > > Recent INTEGRAL observations in gamma show very intense > electron-positron pair annihilation radiation in central regions of the > Galaxy. > > > spectrale sans précédent de ce satellite ont permis de caractériser le > > milieu dans lequel ont lieu ces annihilations et l'étendue spatiale des > > INTEGRAL has better angular resolution and spectral resolution than > earlier instruments/telescopes. > > > sources. Outre la trčs grande difficulté d'alimenter le centre > > galactique en positrons au taux requis par les observations, les > > modčles astrophysiques traditionnels se heurtent au problčme important > > de la distribution spatiale des sources de rayonnement, dont INTEGRAL a > > démontré qu'elles s'étendaient sur au moins 1 kpc autour du centre > > The sources are distributed up to at least 1 kpc from the G Centre - > which is difficult to explain from traditional astrophysical models. > > > galactique. Comment produire autant de positrons (10^43 s'annihilent > > chaque seconde !) et comment les disperser sur un aussi vaste volume ? > > How can so many (10^43) positrons annihilate per second? > How can they be distributed over such a large volume. > > > Un scénario faisant intervenir une composante légčre de matičre noire > > pourrait apporter une réponse simple et fascinante ŕ ces questions. > > One scenario is with a "light [non-heavy] component" of dark matter. > > > Alors, INTEGRAL voit-il la matičre noire du centre galactique? > > > > La demi-journée se déroulera comme suit : > > ---------------------------------------------------------- > > 14h00-14h40 : P. Jean (CESR-Toulouse) > > Observations de l'émission d'annihilation > > e+/e- galactique > > 14h45-15h25 : M. Cassé (IAP-Paris, CEA/Sap-Saclay) > > L'énigme des positrons du bulbe galactique : > > Hypernovae ou matičre noire légčre? > > 15h30-16h10 : C. Boehm (Oxford) > > Comment tester le scénario de matičre noire légčre ? > > 16h35-17h15 : D. Hooper (Oxford) > > Evidence for particle dark matter ? > > 17h20-18h00 : P. Fayet (ENS/LPT-Paris) > > Physique des particules et matičre noire légčre: > > une nouvelle interaction ? > > > > > > > > En espérant vous voir le 18 mai, > > > > Le comité d'organisation : L. Blanchet, A. Bouquet , Y. Giraud-Héraud, > > B. Guiderdoni, J.-Ch. Hamilton, E. Parizot

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AA/2004/0337 - referee report (fwd)
by Boud Roukema 24 May '04

24 May '04

Witam :)) i think we should have no problem with these minor corrections. :)) The only question is whether or not to make changes based on the further tests made since we submitted the paper. Regarding the further tests which i started making, remember that in our paper we have: > However, the plots are striking and it seems prudent to release > them to the scientific community while a companion paper is prepared > with formal statistical analyses. So IMHO it is clear that we intend to publish a companion paper which goes into more detail in statistical tests, and there's no need to make things difficult for ourselves (and slow down publication) by adding more significant material now. How about a cafeplus this Friday to talk more on this + also about Bartek's jet idea? (not electronically public ;) Plus also whatever else cosmo/extragalactic related. # 21.05.2004 09.00g # Place: Radio building http://adjani.astro.uni.torun.pl/cgi-bin/twiki/view/Cosmo/CafePlus pozdr boud > ---------- Forwarded message ---------- > Date: Mon, 17 May 2004 10:12:50 +0200 > From: aanda.paris at obspm.fr > To: boud at astro.uni.torun.pl > Subject: AA/2004/0337 - referee report > > 17/05/2004 > > Dr Boudewijn Roukema > Torun Centre for Astronomy, UMK > ul. Gagarina, 11 > PL-87-100 Torun > POLAND > > boud at astro.uni.torun.pl > Our Ref. : AA/2004/0337 > > Dear Dr Roukema, > > The manuscript entitled : > > "A hint of Poincaré dodecahedral topology in the WMAP first year sky map" > > was submitted to a competent referee who recommended publication following minor revision (see enclosed report). > > Please make the requested improvements and send us the revised version (please set line spacing to double spacing referee's format for language editing) at your earliest convenience. Instructions for resubmitting can be found at address https://mms-aanda.obspm.fr/is/aa. > > > > In your cover letter, please indicate precisely all the changes made in the revised version (p^df or ps.gz file), and mark them clearly (e.g., using boldface) in your manuscript. > > Please make sure that your manuscript is prepared according to the rules given in the Instructions to Authors (see the first Main Journal issue of the year), otherwise the publication of your paper will be delayed. > > Further instructions will be given to you once the paper is accepted. > > With best regards, > > Anthony Jones > A&A Editor > > ----------------------------------------------------------------------------- > > Referee report > --------------- > > This paper contains new and important results and should be > published. There are however some minor points which should be > clarified before the paper could be published. Second sentence of > Section 3.2 "Errors would occur only if, for example, converting > the angular radius of a circle, alpha into a comoving distance in > megaparsecs, or using the inverse cosine of the ratio of the > in-radius, r_, to the distance to the surface of last scattering, > r_{SLS}, to infer the angular radius of a matched circle, i.e. > alpha \\sim cos^{-1}(r_/r_{SLS}) ", this sentence seems to be > missing something. > > There is a full stop after eq.(6), while it should be a comma. > > Second sentence after eq.(6) is "Moreover, the unknown physics of > the cosmological constant (or quintessence) makes it hard to em a > priori exclude any fluctuations in \\Omega_{\\Lambda}, especially > with an amplitude so close to that of matter fluctuations. " - > need to be corrected. > > Full stop after eq.(10) should be replaced by a comma. > > To make the list of References more balanced it should include at > least reference to J. Weeks book The Shape of Space (where there > is a nice discussion of the Poincare dodecahedral space).

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astro-ph/0310233 (apparently) accepted to PRL
by Andrzej Marecki 13 May '04

13 May '04

Nb. this is astro-ph/0310233. However it looks now as if it has been accepted by PRL. am ----- Forwarded message from physnews(a)aip.org ----- Date: Wed, 12 May 2004 14:50:16 -0400 From: physnews(a)aip.org PHYSICS NEWS UPDATE The American Institute of Physics Bulletin of Physics News Number 685 May 12, 2004 by Phillip F. Schewe, Ben Stein OUR UNIVERSE HAS A TOPOLOGY SCALE OF AT LEAST 24 Gpc, or about 75 billion light years, according to a new analysis of data from the Wilkinson Microwave Anisotropy Probe (WMAP). What does this mean? Well, because of conceivable hall-of-mirrors effects of spacetime, the universe might be finite in size but give us mortals the illusion that it is infinite. For example, the cosmos might be tiled with some repeating shape, around which light rays might wrap themselves over and over ("wrap" in the sense that, as in video games, something might disappear off the left side of the screen and reappear on the right side). A new study by scientists from Princeton, Montana State, and Case Western looks for signs of such "wrapped " light in the form of pairs of circles, in opposite directions in the sky, with similar patterns in the temperature of the cosmic microwave background. If the universe were finite and actually smaller than the distance to the "surface of last scattering" (a distance that essentially constitutes the edge of the "visible universe," and the place in deep space whence comes the cosmic microwaves), then multiple imaging should show up in the microwave background. But no such correspondences appeared in the analysis. The researchers are able to turn the lack of recurring patterns into the form of a lower limit on the scale of cosmic topology, equal to 24 billion parsecs, a factor of 10 larger than previous observational bounds. (Cornish, Spergel, Starkman, Komatsu, Physical Review Letters, upcoming article; contact Neil Cornish, 406-994-7986, cornish(a)physics.montana.edu) [...] ----- End forwarded message -----

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DM from INTEGRAL satellite? - Rencontres Cosmologie-Astroparticule-Gravitation: Integral voit-il la matičre noire ? (fwd)
by boud 10 May '04

10 May '04

Discovery of dark matter by INTEGRAL? > ---------- Forwarded message ---------- > Date: Mon, 10 May 2004 19:10:55 +0200 (MET DST) > From: Luc Blanchet <blanchet at iap.fr> > To: users_all at iap.fr > Subject: [X-UNKNOWN] Rencontres Cosmologie-Astroparticule-Gravitation: > Int[X-UNKNOWN] egral voit-il la matičre noire ? > > > Nous vous annonçons la seconde édition des rencontres d'Ile de France : > Cosmologie-Astroparticule-Gravitation: > http://cdfinfo.in2p3.fr/~bouquet/CAG.html > > ======================================== > le 18 mai 2004 de 14h ŕ 18h > Amphithéâtre de l'Institut d'Astrophysique de Paris > 98bis, Bd Arago - 75014 Paris > ========================================= > > > ============================ > INTEGRAL voit-il la matičre noire ? > ============================ Does INTEGRAL see dark matter? > > Résumé: > ------------ > Les récentes observations menées par le satellite INTEGRAL dans le > domaine des rayons gamma confirment l'émission d'un rayonnement > d'annihilation de paires électrons-positrons extręmement intense dans > les régions centrales de la Galaxie. La résolution angulaire et Recent INTEGRAL observations in gamma show very intense electron-positron pair annihilation radiation in central regions of the Galaxy. > spectrale sans précédent de ce satellite ont permis de caractériser le > milieu dans lequel ont lieu ces annihilations et l'étendue spatiale des INTEGRAL has better angular resolution and spectral resolution than earlier instruments/telescopes. > sources. Outre la trčs grande difficulté d'alimenter le centre > galactique en positrons au taux requis par les observations, les > modčles astrophysiques traditionnels se heurtent au problčme important > de la distribution spatiale des sources de rayonnement, dont INTEGRAL a > démontré qu'elles s'étendaient sur au moins 1 kpc autour du centre The sources are distributed up to at least 1 kpc from the G Centre - which is difficult to explain from traditional astrophysical models. > galactique. Comment produire autant de positrons (10^43 s'annihilent > chaque seconde !) et comment les disperser sur un aussi vaste volume ? How can so many (10^43) positrons annihilate per second? How can they be distributed over such a large volume. > Un scénario faisant intervenir une composante légčre de matičre noire > pourrait apporter une réponse simple et fascinante ŕ ces questions. One scenario is with a "light [non-heavy] component" of dark matter. > Alors, INTEGRAL voit-il la matičre noire du centre galactique? > > La demi-journée se déroulera comme suit : > ---------------------------------------------------------- > 14h00-14h40 : P. Jean (CESR-Toulouse) > Observations de l'émission d'annihilation > e+/e- galactique > 14h45-15h25 : M. Cassé (IAP-Paris, CEA/Sap-Saclay) > L'énigme des positrons du bulbe galactique : > Hypernovae ou matičre noire légčre? > 15h30-16h10 : C. Boehm (Oxford) > Comment tester le scénario de matičre noire légčre ? > 16h35-17h15 : D. Hooper (Oxford) > Evidence for particle dark matter ? > 17h20-18h00 : P. Fayet (ENS/LPT-Paris) > Physique des particules et matičre noire légčre: > une nouvelle interaction ? > > > > En espérant vous voir le 18 mai, > > Le comité d'organisation : L. Blanchet, A. Bouquet , Y. Giraud-Héraud, > B. Guiderdoni, J.-Ch. Hamilton, E. Parizot

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Cosmo-torun May 2004