ESO-ESA working group on fundamental cosmology: report
http://www.stecf.org/coordination/esa_eso/wg.php?working_group=cosmology ESA-ESO WG on Fundamental Cosmology Working Group Members: George Efstathiou John Ellis Bruno Leibundgut Simon Lilly Yannick Mellier John Peacock (chair) Peter Schneider (co-chair) Abstract of final report In September 2003, the executives of ESO and ESA agreed to establish a number of working groups to explore possible synergies between these two major European astronomical institutions on key scientific issues. The first two working group reports (on Extrasolar Planets and the Herschel--ALMA Synergies) were released in 2005 and 2006, and this third report covers the area of Fundamental Cosmology. The Working Group's mandate was to concentrate on fundamental issues in cosmology, as exemplified by the following questions: * What are the essential questions in fundamental cosmology? * Which of these questions can be tackled, perhaps exclusively, with astronomical techniques? * What are the appropriate methods with which these key questions can be answered? * Which of these methods appear promising for realization within Europe, or with strong European participation, over the next ~15 years? * Which of these methods has a broad range of applications and a high degree of versatility even outside the field of fundamental cosmology?
From the critical point of view of synergy between ESA and ESO, one major resulting recommendation concerns the provision of new generations of imaging survey, where the image quality and near-IR sensitivity that can be attained only in space are naturally matched by ground-based imaging and spectroscopy to yield massive datasets with well-understood photometric redshifts (photo-z's). Such information is essential for a range of new cosmological tests using gravitational lensing, large-scale structure, clusters of galaxies, and supernovae. All these methods can in principle deliver high accuracy, but a multiplicity of approaches is essential in order that potential systematics can be diagnosed -- or the possible need for new physics revealed. Great scope in future cosmology also exists for ELT studies of the intergalactic medium and space-based studies of the CMB and gravitational waves; here the synergy is less direct, but these areas will remain of the highest mutual interest to the agencies. All these recommended facilities will produce vast datasets of general applicability, which will have a tremendous impact on broad areas of astronomy.
Full report (2.4Mb pdf): http://www.stecf.org/coordination/esa_eso/cosmology/report_cover.pdf
Dear Boud, Thanks a lot for all the material you sent me (including this one - which seems interesting to us) Please give me one more day for reading our new manuscript. I'll try to call you on wednesday, anyway I'll be in touch via e-mail Regadrs and cheers <Marek ________________________________ Od: cosmo-pl-bounces@cosmo.torun.pl w imieniu Boud Roukema Wysłano: Pn 2006-09-25 16:17 Do: cosmo-torun@cosmo.torun.pl DW: cosmo-pl@cosmo.torun.pl Temat: [Cosmo-pl] ESO-ESA working group on fundamental cosmology: report http://www.stecf.org/coordination/esa_eso/wg.php?working_group=cosmology ESA-ESO WG on Fundamental Cosmology Working Group Members: George Efstathiou John Ellis Bruno Leibundgut Simon Lilly Yannick Mellier John Peacock (chair) Peter Schneider (co-chair) Abstract of final report In September 2003, the executives of ESO and ESA agreed to establish a number of working groups to explore possible synergies between these two major European astronomical institutions on key scientific issues. The first two working group reports (on Extrasolar Planets and the Herschel--ALMA Synergies) were released in 2005 and 2006, and this third report covers the area of Fundamental Cosmology. The Working Group's mandate was to concentrate on fundamental issues in cosmology, as exemplified by the following questions: * What are the essential questions in fundamental cosmology? * Which of these questions can be tackled, perhaps exclusively, with astronomical techniques? * What are the appropriate methods with which these key questions can be answered? * Which of these methods appear promising for realization within Europe, or with strong European participation, over the next ~15 years? * Which of these methods has a broad range of applications and a high degree of versatility even outside the field of fundamental cosmology?
From the critical point of view of synergy between ESA and ESO, one major resulting recommendation concerns the provision of new generations of imaging survey, where the image quality and near-IR sensitivity that can be attained only in space are naturally matched by ground-based imaging and spectroscopy to yield massive datasets with well-understood photometric redshifts (photo-z's). Such information is essential for a range of new cosmological tests using gravitational lensing, large-scale structure, clusters of galaxies, and supernovae. All these methods can in principle deliver high accuracy, but a multiplicity of approaches is essential in order that potential systematics can be diagnosed -- or the possible need for new physics revealed. Great scope in future cosmology also exists for ELT studies of the intergalactic medium and space-based studies of the CMB and gravitational waves; here the synergy is less direct, but these areas will remain of the highest mutual interest to the agencies. All these recommended facilities will produce vast datasets of general applicability, which will have a tremendous impact on broad areas of astronomy.
Full report (2.4Mb pdf): http://www.stecf.org/coordination/esa_eso/cosmology/report_cover.pdf _______________________________________________ Cosmo-pl mailing list Cosmo-pl@cosmo.torun.pl http://cosmo.torun.pl/mailman/listinfo/cosmo-pl
Dear Boud, I've had troubles with the server so I was not able to e-mail earlier. Also I've tried to phone you on a stationary phone number you gave me this summer -- without success. My wife's guess was that perhaps new family duties keep you out of reach ... By the way: is it son or daughter ? Congratulations in any case ! I have ready a new manuscript carefully and I have the following remarks concerning the latest version of our paper. 1. Numerical examples should go to the discussion chapter after Chptr. 4.4 Motivation: in the examples we refer to the comoving distance \chi which has been introduced only in Chapter 4.1. Placing numerics in the place it is now, could look a bit confusing to the reader. 2. Figure captions for Figs.1-8 are hard to follow. It is not clear for a reader which cases they cover. It would be much more transparent to say which figs illustrate self-gravity of a large cluster and which illustrstes effect relative to cosmic web. 3. When you say T^2 it is really a T^1 case (2 images = 2^1) T^3 is OK (8 images = 2^3) 4. In 4.5 two subsequent paragraphs (2nd and 3rd) are written somewhat unclear. When you say "In infinite simply connected Euclid. space there is no meaningful way to calculate gravitational interactions if only a single point-like body is present" you really mean that there is no way to calculate a self-interaction for a single massive body (Of course stricty speaking you're right - if there is no other bodies ... even test massess ... then there is no interaction But original formulation could be confusing in my opinion) Think of appropriate reformulating this. 5. Finally, the section 4.2 "SPeculation regarding the early Universe" I got your point and personally I think that its a good idea to follow However I agree with the referee that present formulation is naive. If we speak of inflation then there were no dominating massive bodies - it was rather a Quantum Field Theoretical regime ... I think that alternating the axes is somewhat reminiscent of mixmaster model - of course mixmaster is Bianchi IX not FRLW ...... but there is another problem here which we should better understand : what is the relation between the scale factors (in the metric - these are dynamic according to GR) and topological lengths of the fundamental domain (thier change should be governed by laws making topology dynamic ... and we do not know such laws, besides hints that they could be quantum - gravitational whatever it means) In conclusion I think that this idea should be better elaborated even before it's barely mentioned. I would propose to delete this section. Best Regards, Marek ________________________________ Od: cosmo-pl-bounces@cosmo.torun.pl w imieniu Boud Roukema Wysłano: Pn 2006-09-25 16:17 Do: cosmo-torun@cosmo.torun.pl DW: cosmo-pl@cosmo.torun.pl Temat: [Cosmo-pl] ESO-ESA working group on fundamental cosmology: report http://www.stecf.org/coordination/esa_eso/wg.php?working_group=cosmology ESA-ESO WG on Fundamental Cosmology Working Group Members: George Efstathiou John Ellis Bruno Leibundgut Simon Lilly Yannick Mellier John Peacock (chair) Peter Schneider (co-chair) Abstract of final report In September 2003, the executives of ESO and ESA agreed to establish a number of working groups to explore possible synergies between these two major European astronomical institutions on key scientific issues. The first two working group reports (on Extrasolar Planets and the Herschel--ALMA Synergies) were released in 2005 and 2006, and this third report covers the area of Fundamental Cosmology. The Working Group's mandate was to concentrate on fundamental issues in cosmology, as exemplified by the following questions: * What are the essential questions in fundamental cosmology? * Which of these questions can be tackled, perhaps exclusively, with astronomical techniques? * What are the appropriate methods with which these key questions can be answered? * Which of these methods appear promising for realization within Europe, or with strong European participation, over the next ~15 years? * Which of these methods has a broad range of applications and a high degree of versatility even outside the field of fundamental cosmology?
From the critical point of view of synergy between ESA and ESO, one major resulting recommendation concerns the provision of new generations of imaging survey, where the image quality and near-IR sensitivity that can be attained only in space are naturally matched by ground-based imaging and spectroscopy to yield massive datasets with well-understood photometric redshifts (photo-z's). Such information is essential for a range of new cosmological tests using gravitational lensing, large-scale structure, clusters of galaxies, and supernovae. All these methods can in principle deliver high accuracy, but a multiplicity of approaches is essential in order that potential systematics can be diagnosed -- or the possible need for new physics revealed. Great scope in future cosmology also exists for ELT studies of the intergalactic medium and space-based studies of the CMB and gravitational waves; here the synergy is less direct, but these areas will remain of the highest mutual interest to the agencies. All these recommended facilities will produce vast datasets of general applicability, which will have a tremendous impact on broad areas of astronomy.
Full report (2.4Mb pdf): http://www.stecf.org/coordination/esa_eso/cosmology/report_cover.pdf _______________________________________________ Cosmo-pl mailing list Cosmo-pl@cosmo.torun.pl http://cosmo.torun.pl/mailman/listinfo/cosmo-pl
participants (2)
-
Boud Roukema -
Marek Biesiada