1. UCL Astrophysics ~100 people (20 academic staff) Research Areas: Stellar astrophysics, Star formation, Astro-chemistry, Cosmology, Atmospheric Physics, exo-planets, Optics, Mill Hill Observatory

2. UCL Astrophysics Group Cosmologists Ofer Lahav Tomek Kacprzak Barney Rowe Michael Hirsch Sarah Bridle Sree Balan Fotini Economou Alex Merson Emily Hall Lisa Voigt Joe Zuntz Jason McEwen Filipe Abdalla Emma Chapman Maayane Sougmanac Laura Wolz Boris Leistedt Stephen Feeney Hiranya Peiris Manda Banerji Donnacha Kirk Lucy Clerkin Niall MacCrann Aurelien Benoit-Levy Walter Santos

3. A brief history of UCL P&A Cosmology Start of group: 2004 Ofer Lahav 1st generation (2004): –Sarah Bridle -> Professor, Manchester –Jochen Weller -> Professor, Munich 2nd generation (2008): –Hiranya Peiris –Filipe Abdalla 3rd generation (2012): –Two appointments

4. Filipe Abdalla Radio/Optical Cosmology EoRWeak lensing Euclid DESSKA Sarah Bridle Cosmic Shear Galaxy shapesDES Dark energy Ofer Lahav Galaxy surveys MegaZ-LRG 2MRSPhoto-z HST-MCTDES Euclid Hiranya Peiris Early Universe PlanckInflation IsotropyNon-Gaussianity Statistical Cosmology from Surveys GR tests

5. Future prospects The Dark Energy Survey Einstein’s cosmological constant A new fluid called Dark Energy General Relativity is wrong Why is the Universe Accelerating?

6. 5 DES lenses – assembly at UCL Polishing & coating coordinated by UCL (with £1.76M STFC funding, PI: Lahav) C3

7. DES First Light 12 Sep 2012 NGC1365

8. Photometric Redshifts Collister & Lahav 2004 http://www.star.ucl.ac.uk/~lahav/annz.html

9. Neutrino Mass Thomas, Abdalla & Lahav, PRL (2010) Lahav, Kiakotou, Abdalla & Blake, MNRAS (2010) Swanson, Percival & Lahav, MNRAS (2010) Kiakotou, Elgaroy & Lahav, PRD (2008) Constraints from MegaZ-LRG 700,000 galaxies 0.05 eV < Total neutrino mass < 0.28 eV (95% CL) Forecast constraints from DES CDM+ massive neutrinos CDM only Advanced ERC TESTDE team

10. DESpec: Spectroscopic follow up of DES 4000–fibre $40M (?) instrument 7 million galaxy spectra, target list from DES, DETF Stage IV experiment DES+DESpec can distinguish DE from ModGrav Kirk, Lahav, Bridle, Abdalla, Jouvel et al. (in preparation) Jouvel, Abdalla, Blahav, Bridle et al.(in preparation) DESpec white paper Abdalla et al. astro-ph:1209.2451

11. ESA Euclid During the design phase: –Photo-z needs (Abdalla et al. 08) –Coulour dependence of the psf (Cypriano et al. 10 Voigt et al. 11) During the implementation phase –Science working groups. –Science ready data (OU-LE3) –Photo-z (OU-PHZ) –Shear measurement (OU-SHE)

12. PI: Postman; UCL coI: Lahav + Host & Jouvel 25 clusters Testing conflict with LCDM Discovering z=10 galaxy candidates

13. Weak Gravitational Lensing & Intrinsic alignments

14. Image analysis of galaxy shapes Figure from the GREAT08 Handbook. Bridle et al 2009 Barney Rowe now co-leading next GREAT-like challenge

15. Add foregrounds 100- 1000 times larger Cosmic signal LOFAR - EoR EoR Data being taken now! Working on Foreground removal Recovered signal (Chapman et al. 12a,b) Yatawata et al. 12

16. Square Kilometre Array: SKA Forecasts, simulations New imaging techniques

17. Status of Surveys we are involved in HST-CLASH: Observations started in Nov 2010 Planck: See Hiranya’s talk... LOFAR: Telescope is ready, KSP taking data now. DES: First light Sep. Survey starts Dec. Euclid: Selected by ESA in Oct 2011. Launch 2019 DESpec, BigBOSS: Study funding from STFC SKA: Site selection done. Studies for implementation phase.

18. Synergies between P&A and other London institutes Imperial -> Euclid, Planck, Astro-statistics, Theory, EoR/SKA Kings -> Early universe, HEP QM-> Early Universe, VISTA MSSL (UCL) -> Euclid, Weak lensing, LOFAR