eLISA (or NGO): the New LISA Gijs Nelemans Radboud University Nijmegen Some history on GW detector in space ‣ Low-frequency gravitational wave mission first proposed in '80s (LAGOS) ‣ '90s: LISA as joint NASA/ESA mission ‣ In the end LISA became (1 of 3) L1 candidate for ESA Cosmic Vision program (decision foreseen in 2011) ‣ Early 2011, NASA: no money to contribute to any ESA L1 mission...... ‣ Rapid definition teams for all L1 candidates to ESA-led mission. New mission (eLISA/NGO) developed, significant cost reduction, science still strong ‣ Next step: April 2012, ESA will select 1 of 3 L1 candidates for launch ~2020 LISA eLISA ‣ Affordable mission: smaller arms, closer to Earth (save on launcher) ‣ Mother-daughter system links only) (i.e. 4 ‣ Reuse much of LISA Pathfinder components ‣ Pay-load simpler and cheaper, telescopes smaller ‣ Member state contribution: pay load (as in all candidate L1 missions) ‣ Consortium to be formed (NL role?) What is different from LISA? eLISA LISA ‣ 1 million km arms 5 million km arms ‣ 4 laser links 6 laser links ‣ Smaller distance to Earth Larger distance to Earth ‣ 2 Soyuz launch Ariane 5 launch ‣ Member state contributions No member state contribution Overview eLISA science ‣ Precision test of strong-field gravity ‣ Detect SMBH mergers at high redshift ‣ Trace merger history of BHs over large redshift and mass range ‣ Characterise environment of galaxy central objects and test if are GR Kerr BH ‣ Measure spectrum or set limits on backgrounds (probe inflation) ‣ Detect thousands of Galactic binaries (tests binary evolution, type Ia supernovae, tides, mass transfer, Galactic structure) ‣ http://arxiv.org/abs/1201.3621 Dutch role/interest in eLISA ‣ Work on LISA Pathfinder by SRON in past ‣ Interest in Galactic compact binaries since '90s (UU then RU) ‣ Interest in EMRIs at Nikhef ‣ Increase in astronomy research related to eLISA science (Leiden, Groningen) ‣ Poll showed interest also from other people, including theoretical physics ‣ TNO interested in eLISA hardware (presentation later today) ‣ Maybe enough interest to join member state contribution consortium (data access, funding opportunities) Galactic binaries Galactic binaries - Verification - Simulated pop. Super-massive black hole mergers 10 20 50 100 300 500 1000 SMBH signal-to-noise ratio as function redshift Trace structure formation SNR of simulated merger tries. Can distinguish different models (seed mass, time first BH formation) Extreme mass-ratio inspirals (trace BH, test GR) Maximum redshift for different models (template, SMBH spin) SNR as function of redshift (Strategic) plans (Adv)Virgo/LIGO (Nikhef, RU) FOM programma, Nikhef, NWO-G proposal (Nikhef) Proposal dedicated optical follow-up telescope + triggering (RU) NS studies (UvA, GRAPPA), AARTFARC, LOFAR (ASTRON) Pulsar Timing Arrays (ASTRON) EPTA, LEAP Plans for SKA ELISA (Astro)physics (RU, Leiden, Nikhef, Groningen), small scale Hardware? Join pay-load consortium (TNO) Minigrail SRON? Other parties? New strategic plan astroparticle physics Astroparticle program NWO? National coordination?