1. DARK MATTER PROBES OF SUPERMASSIVE BLACK HOLE S HotSci 23 July 2014 Joe Silk (IAP, JHU)

2. SMBH binaries in quasars may be common at parsec scales, from Balmer line offsets Liu e al 2013

3. Stuck at the final parsec… Benson 2014 Mpc

4. IMBH EXPEL BARYONS Two baryon problems: Too big to fail dwarfs & low baryon fraction in massive galaxies Intermediate mass BH 10 3 -10 6 M sun Inoue + 2013

5. supernovae IMBH Baryon fraction fraction Peirani + 2012 Boylan-Kirchin et al. 2011 predicted hosts, not observed Duc + 2013 Dubois+ 2013

6. Gondolo + JS 1999, Gnedin & Primack 2004, Sadeghian, Ferrer + Will 2013 mxmx Plateau: n x (r) t BH ~ 1 Density profile

7. Vasiliev & Zelnikov 2008 t r (GC,M31)~3Gyr but SMBH at GC grows over 1 Gyr & t r (M87 SMBH)~10 5 Gyr! ~t r ~3t r Does cusp survive?MAYBE!

8. NEAR BINARY BLACK HOLES

9. Kozai mechanism drives resonant infall of DM in eccentric orbits………operates for binary black hole Naoz and Silk 2014

10. Dark matter torus forms

11. supermassive black hole at Galactic Center HESS J1745-290 prediction for CTA: superexponential signature of TeV DM annihilations Belikov & JS 2013 Vaiana + 2014 30-300 GeV the near future

12. NEARBY AGN M87 is an attractive target Distance 2000 x GC but M BH 1000 x SagA* Flux ~ n x 2 (2r p ) 3 ~ M BH 3 / for low n x (r p ) t BH ~ 1 Dynamical heating of spike ~ 10 14 yr vs 10 9 yr (GC)

13. Gorchtein et al 2010 Gomez et al 2013 M87 CenA relativistic jets emanate from ergosphere, so high energy e,p collide with DM spike particles!

14. EXTRAGALACTIC GAMMA RAY BACKGROUND There is room for an exotic component from dark matter EXTRACALACTIC DIFFUSE  RAY BACKGROUND

15. 10 TeV 1 TeV 0.1 TeV NFW Belikov & Silk 2013 Annihilations In dark matter spikes around supermassive black holes

16. THE ULTIMATE PARTICLE ACCELERATOR: dark matter cusp around black hole particle horizon Schwarzschild BLACK HOLES maximum 4.5 m

17. NEAR KERR BLACK HOLES ergospherePenrose process

19. particle horizon r S =2GM/c 2 Banados, West, JS 2009 Highly controversial…but the dust hasn’t settled yet! Kerr black hole near event-horizon particle collisions of KK particles: excitations Arina, Bringmann, Vollmann, JS 2014 Rotating black hole can feed Penrose effect via DM particle collisions no maximum for extremal Kerr!

20. Black hole shadow Event Horizon Telescope Simulated image at 1mm of M87 or SagA* black hole Resolve horizon scale GM/c 2 at ~5  arcsec Huang + 2007 M87 distance 2000 x GC but M BH 1000 x SagA*