LindaHolyoke Mentor:Dr.ErikSchnetter MeganMiller - - PowerPoint PPT Presentation

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Nov 15, 2023 316 likes •481 views

LindaHolyoke Mentor:Dr.ErikSchnetter MeganMiller Mentor:Dr.PeterDiener BriefOverview BlackHolesandNeutronStars GravitationalWavesandGammaRays

SLIDE 1 Linda Holyoke   Mentor: Dr. Erik Schnetter  Megan Miller   Mentor: Dr. Peter Diener 

SLIDE 2

 Brief Overview 

Black Holes and Neutron Stars 
Gravitational Waves and Gamma‐Rays 
General Relativity/Methods 
Purpose of Research 
Research Goals

SLIDE 3 [1] 

SLIDE 4 Black Hole  Neutron Star  Mass  >3 solar masses  1.4~3 solar masses  Density  ∞  2~4 x 10^14 times ρsun  Escape Velocity  ∞  33% speed of light 

Black Holes and Neutron Stars 

Formation: massive star  collapse – Supernova!! 

[2] 

SLIDE 5

Black Hole Geometry 

[3] 

SLIDE 6

Gravitational Waves                 

What they are – in theory? 
Why do we care? 
What do we think will create them? 
How do we detect them?  
LIGO (Laser

Interferometer Gravitational  Wave Observatory) 

[4] 

SLIDE 7

Gamma‐Rays 

Long Gamma‐Ray Bursts vs. Short Gamma‐

Ray Bursts (SGRB) 

SGRB mechanisms:     NS‐NS collision 
Most energetic

events in universe      

BH‐NS encounter 

[5] 

SLIDE 8

General Relativity 

Why we need to consider it? 
Curvature of Space‐time 
Einstein Toolkit / Cactus

SLIDE 9

Project Goals 

Black Hole – Black Hole: 

1) Will two black holes in parabolic orbit create 

gravitational waves that are detectable?  

2) Depending on the size, how far away can we 

detect gravitational waves? 

SLIDE 10

Project Goals 

Neutron Star – Black Hole: 

1) Will the neutron star form an accretion disk 

around the black hole? 

2) Will this disk survive as long as the duration 

f observed SGRBs?

SLIDE 11

Initial Conditions 

Black Hole – Black Hole  Black Hole – Neutron Star  Mass 1 (solar masses)  0.5  4.51    Mass 2 (solar masses)  0.5  1.4  Initial separation (km)  100  100  Periastron distance (km)  2.21  20.1  Initial Configuration  Periastron Distance 

SLIDE 12

Initial Conditions 

Results: 

Black Hole –   Black Hole  Black Hole –  Neutron Star  Mass 1  Mass 2  Mass 1  Mass 2  x –position  (km)  50  ‐50  24  ‐76  vx  (m/s)  ‐2.55*107  2.55*107  ‐2.66*107  8.56*107  vy (m/s)  3.84*106  ‐3.84*106  1.33*107  ‐4.29*107  vtotal  (m/s)  2.58*107  2.58*107  2.97*107  9.58*107 

SLIDE 13

Upcoming Weeks 

Setup Parameter File 
Start Simulations 
Hope for the best 
Fix errors and rerun 
Adjust initial conditions based on results of

first simulations 

SLIDE 14

Works Cited 

Illustrations:  

[1] http://imagine.gsfc.nasa.gov/docs/science/know_l1/supernovae.html  [2]  http://spacefellowship.com/wp‐content/uploads/2009/07/ supernova_p0901xx_01hr‐300x200.jpg  [3]  http://theory.uwinnipeg.ca/users/gabor/black_holes/images/ slide8.gif  [4] http://www.phys.ufl.edu/~price/binary‐wave.jpg  [5]  http://www.nasa.gov/images/content/ 55961main_MM_image_feature_132_jw4.jpg 

SLIDE 15

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