Gravitational Waves from Binary Black Hole Mergers Inside of Stars - PowerPoint PPT Presentation

I NTRODUCTION G RAVITATIONAL W AVES N UMERICAL R ELATIVITY B INARY B LACK H OLES I N S TARS S UMMARY Gravitational Waves from Binary Black Hole Mergers Inside of Stars Joseph M. Fedrow C.D. Ott, U. Sperhake, R. Haas, J. Blackman, C. Reisswig, and A. De Felice August 3, 2017 Joseph M. Fedrow GWs from BBH Mergers Inside of Stars August 3, 2017 1 / 47

I NTRODUCTION G RAVITATIONAL W AVES N UMERICAL R ELATIVITY B INARY B LACK H OLES I N S TARS S UMMARY E INSTEIN IN V IETNAM Joseph M. Fedrow GWs from BBH Mergers Inside of Stars August 3, 2017 2 / 47

I NTRODUCTION G RAVITATIONAL W AVES N UMERICAL R ELATIVITY B INARY B LACK H OLES I N S TARS S UMMARY Joseph M. Fedrow GWs from BBH Mergers Inside of Stars August 3, 2017 3 / 47

I NTRODUCTION G RAVITATIONAL W AVES N UMERICAL R ELATIVITY B INARY B LACK H OLES I N S TARS S UMMARY Joseph M. Fedrow GWs from BBH Mergers Inside of Stars August 3, 2017 4 / 47

I NTRODUCTION G RAVITATIONAL W AVES N UMERICAL R ELATIVITY B INARY B LACK H OLES I N S TARS S UMMARY Joseph M. Fedrow GWs from BBH Mergers Inside of Stars August 3, 2017 5 / 47

I NTRODUCTION G RAVITATIONAL W AVES N UMERICAL R ELATIVITY B INARY B LACK H OLES I N S TARS S UMMARY Joseph M. Fedrow GWs from BBH Mergers Inside of Stars August 3, 2017 6 / 47

I NTRODUCTION G RAVITATIONAL W AVES N UMERICAL R ELATIVITY B INARY B LACK H OLES I N S TARS S UMMARY Joseph M. Fedrow GWs from BBH Mergers Inside of Stars August 3, 2017 7 / 47

I NTRODUCTION G RAVITATIONAL W AVES N UMERICAL R ELATIVITY B INARY B LACK H OLES I N S TARS S UMMARY The era of gravitational wave astronomy has truly just started! Joseph M. Fedrow GWs from BBH Mergers Inside of Stars August 3, 2017 8 / 47

I NTRODUCTION G RAVITATIONAL W AVES N UMERICAL R ELATIVITY B INARY B LACK H OLES I N S TARS S UMMARY GW150914 Why was this observation so important? ◮ It is our first direct observation of gravitational waves. ◮ It is our first direct detection of black holes in the Universe. ◮ It has opened a new observational window on the Universe. This was the first time humans observed the Universe through the lens of gravitational waves. Joseph M. Fedrow GWs from BBH Mergers Inside of Stars August 3, 2017 9 / 47

I NTRODUCTION G RAVITATIONAL W AVES N UMERICAL R ELATIVITY B INARY B LACK H OLES I N S TARS S UMMARY G RAVITATIONAL W AVES Joseph M. Fedrow GWs from BBH Mergers Inside of Stars August 3, 2017 10 / 47

I NTRODUCTION G RAVITATIONAL W AVES N UMERICAL R ELATIVITY B INARY B LACK H OLES I N S TARS S UMMARY C ONSTRUCTING THE W AVES Joseph M. Fedrow GWs from BBH Mergers Inside of Stars August 3, 2017 11 / 47

I NTRODUCTION G RAVITATIONAL W AVES N UMERICAL R ELATIVITY B INARY B LACK H OLES I N S TARS S UMMARY C HOOSING THE G AUGE Joseph M. Fedrow GWs from BBH Mergers Inside of Stars August 3, 2017 12 / 47

I NTRODUCTION G RAVITATIONAL W AVES N UMERICAL R ELATIVITY B INARY B LACK H OLES I N S TARS S UMMARY S YMMETRIES B ECOME O BSERVABLES Joseph M. Fedrow GWs from BBH Mergers Inside of Stars August 3, 2017 13 / 47

I NTRODUCTION G RAVITATIONAL W AVES N UMERICAL R ELATIVITY B INARY B LACK H OLES I N S TARS S UMMARY D ETECTING G RAVITATIONAL W AVES Joseph M. Fedrow GWs from BBH Mergers Inside of Stars August 3, 2017 14 / 47

I NTRODUCTION G RAVITATIONAL W AVES N UMERICAL R ELATIVITY B INARY B LACK H OLES I N S TARS S UMMARY D ETECTING G RAVITATIONAL W AVES Joseph M. Fedrow GWs from BBH Mergers Inside of Stars August 3, 2017 15 / 47

I NTRODUCTION G RAVITATIONAL W AVES N UMERICAL R ELATIVITY B INARY B LACK H OLES I N S TARS S UMMARY D ETECTING G RAVITATIONAL W AVES Joseph M. Fedrow GWs from BBH Mergers Inside of Stars August 3, 2017 16 / 47

I NTRODUCTION G RAVITATIONAL W AVES N UMERICAL R ELATIVITY B INARY B LACK H OLES I N S TARS S UMMARY D ETECTION : S EPTEMBER 14, 2015! Joseph M. Fedrow GWs from BBH Mergers Inside of Stars August 3, 2017 17 / 47

I NTRODUCTION G RAVITATIONAL W AVES N UMERICAL R ELATIVITY B INARY B LACK H OLES I N S TARS S UMMARY D ETECTION : S EPTEMBER 14, 2015! The detection relied upon matched filtering of gravitational waveforms from numerical relativity simulations Joseph M. Fedrow GWs from BBH Mergers Inside of Stars August 3, 2017 18 / 47

I NTRODUCTION G RAVITATIONAL W AVES N UMERICAL R ELATIVITY B INARY B LACK H OLES I N S TARS S UMMARY N UMERICAL R ELATIVITY Joseph M. Fedrow GWs from BBH Mergers Inside of Stars August 3, 2017 19 / 47

I NTRODUCTION G RAVITATIONAL W AVES N UMERICAL R ELATIVITY B INARY B LACK H OLES I N S TARS S UMMARY T HE ADM EQUATIONS Joseph M. Fedrow GWs from BBH Mergers Inside of Stars August 3, 2017 20 / 47

I NTRODUCTION G RAVITATIONAL W AVES N UMERICAL R ELATIVITY B INARY B LACK H OLES I N S TARS S UMMARY A LTERNATIVE F ORMULATIONS OF ADM Joseph M. Fedrow GWs from BBH Mergers Inside of Stars August 3, 2017 21 / 47

I NTRODUCTION G RAVITATIONAL W AVES N UMERICAL R ELATIVITY B INARY B LACK H OLES I N S TARS S UMMARY EINSTEINTOOLKIT . ORG ! ◮ A collection of open-source software components for simulating extreme general-relativistic systems. ◮ Roughly 110 users worldwide, spread across over 50 groups, with about 10 active maintainers. ◮ Built upon the Cactus framework and you choose which ’thorns’ you need to achieve the science goals you are after. arXiv:1305.5299 arXiv:1111.3344 Joseph M. Fedrow GWs from BBH Mergers Inside of Stars August 3, 2017 22 / 47

I NTRODUCTION G RAVITATIONAL W AVES N UMERICAL R ELATIVITY B INARY B LACK H OLES I N S TARS S UMMARY EINSTEINTOOLKIT . ORG Once you have the Einstein Toolkit configured for your simulation, you can relax on the beach while the supercomputers do all the hard work! Joseph M. Fedrow GWs from BBH Mergers Inside of Stars August 3, 2017 23 / 47

I NTRODUCTION G RAVITATIONAL W AVES N UMERICAL R ELATIVITY B INARY B LACK H OLES I N S TARS S UMMARY T HE MRI2 ( ZWICKY ) C LUSTER AT C ALTECH Specially configured for simulating black holes and other extreme spacetimes ◮ 2244 Intel X5650 compute cores plus 320 Intel E5-2670 cores ◮ Uses the Torque batch system for processing jobs Joseph M. Fedrow GWs from BBH Mergers Inside of Stars August 3, 2017 24 / 47

I NTRODUCTION G RAVITATIONAL W AVES N UMERICAL R ELATIVITY B INARY B LACK H OLES I N S TARS S UMMARY S TAMPEDE AT U NIVERSITY OF T EXAS Joseph M. Fedrow GWs from BBH Mergers Inside of Stars August 3, 2017 25 / 47

I NTRODUCTION G RAVITATIONAL W AVES N UMERICAL R ELATIVITY B INARY B LACK H OLES I N S TARS S UMMARY S TAMPEDE AT U NIVERSITY OF T EXAS Joseph M. Fedrow GWs from BBH Mergers Inside of Stars August 3, 2017 26 / 47

I NTRODUCTION G RAVITATIONAL W AVES N UMERICAL R ELATIVITY B INARY B LACK H OLES I N S TARS S UMMARY S TAMPEDE AT U NIVERSITY OF T EXAS ◮ ∼ 10 Petaflops ( ∼ 10 quadrillion calculations per second) ◮ 6400 Dell C8220 compute nodes ◮ Each node has two Intel E5 8-core processors ◮ Uses the SLURM batch system for processing jobs Joseph M. Fedrow GWs from BBH Mergers Inside of Stars August 3, 2017 27 / 47

I NTRODUCTION G RAVITATIONAL W AVES N UMERICAL R ELATIVITY B INARY B LACK H OLES I N S TARS S UMMARY D ETECTION : S EPTEMBER 14, 2015! Joseph M. Fedrow GWs from BBH Mergers Inside of Stars August 3, 2017 28 / 47

I NTRODUCTION G RAVITATIONAL W AVES N UMERICAL R ELATIVITY B INARY B LACK H OLES I N S TARS S UMMARY Joseph M. Fedrow GWs from BBH Mergers Inside of Stars August 3, 2017 29 / 47

I NTRODUCTION G RAVITATIONAL W AVES N UMERICAL R ELATIVITY B INARY B LACK H OLES I N S TARS S UMMARY GW150914 EM COUNTERPART ? Joseph M. Fedrow GWs from BBH Mergers Inside of Stars August 3, 2017 30 / 47

I NTRODUCTION G RAVITATIONAL W AVES N UMERICAL R ELATIVITY B INARY B LACK H OLES I N S TARS S UMMARY B INARY B LACK H OLE S IMULATIONS WITH G AS Motivation Investigate the feasibility of Loeb arXiv:1602.04735: Electromagnetic Counterparts to Black Hole Mergers Detected by LIGO ◮ Set up a BBH simulation in vacuum ◮ Extract the waveform ◮ Re-run the simulation with stellar environment level gas ◮ Extract the new waveform ◮ Compare the two What effect, if any, would the presence of accreting matter have on the GW strain we measure? Joseph M. Fedrow GWs from BBH Mergers Inside of Stars August 3, 2017 31 / 47

I NTRODUCTION G RAVITATIONAL W AVES N UMERICAL R ELATIVITY B INARY B LACK H OLES I N S TARS S UMMARY I N V ACUUM Joseph M. Fedrow GWs from BBH Mergers Inside of Stars August 3, 2017 32 / 47

I NTRODUCTION G RAVITATIONAL W AVES N UMERICAL R ELATIVITY B INARY B LACK H OLES I N S TARS S UMMARY O RBITAL T RAJECTORY 5 y/M 0 − 5 − 5 0 5 x/M Joseph M. Fedrow GWs from BBH Mergers Inside of Stars August 3, 2017 33 / 47

I NTRODUCTION G RAVITATIONAL W AVES N UMERICAL R ELATIVITY B INARY B LACK H OLES I N S TARS S UMMARY C OORDINATE S EPARATION Vacuum 1.0 Coordinate Separation [ 10 8 cm] 0.8 0.6 0.4 0.2 0.0 0.1 0.2 0.3 0.4 Time [ s ] Joseph M. Fedrow GWs from BBH Mergers Inside of Stars August 3, 2017 34 / 47

I NTRODUCTION G RAVITATIONAL W AVES N UMERICAL R ELATIVITY B INARY B LACK H OLES I N S TARS S UMMARY G RAVITATIONAL W AVE S TRAIN : Scaled to 60 M ⊙ 0.5 + [ 10 − 21 ] 0.0 h 22 − 0.5 Vacuum − 0.4 − 0.3 − 0.2 − 0.1 0.0 Time [ s ] Joseph M. Fedrow GWs from BBH Mergers Inside of Stars August 3, 2017 35 / 47