Presentation on theme: "The Calculus of Black Holes James Wang Elizabeth Lee Alina Leung Elizabeth Klinger."— Presentation transcript:
The Calculus of Black Holes James Wang Elizabeth Lee Alina Leung Elizabeth Klinger
What is a Black Hole? A region from which even light cannot escape –Thus the black hole itself cannot be seen –Detected through gravitational distortion of nearby planets and stars, and radiation Has infinite gravitational pull and density
What is the Event Horizon? An area around the singularity of the black hole where no particle can escape its pull No outside influences can affect the particle’s descent towards the black hole
What are Stationary Limits? Stationary limit – area around black hole (outer border) –Particles in area are in constant motion –Rotating black hole (Kerr’s) – distortion of space Doesn’t apply to Schwarzchild black hole – doesn’t rotate Gravity infinitely intense Limit between this and event horizon – ergosphere Limit at which light can escape
Diagram of a Black Hole
Pictures of Black Holes
How are Black Holes Modeled? Black holes create “indentations” in space/time continuum Curvature is the only logical way to model black holes Black holes follow the “no-hair” theorem Only three characteristics distinguishing black holes from one another are mass, angular momentum, and electric charge
Black Holes and Einstein’s General Theory of Relativity Gravity – curved space time –Caused by mass and radius of an object, as well as energy –Strong gravitational field = more curvature –Applies to light – light gets curved –Space affects movement of object –No material object can move faster than speed of light Black hole – area where space time curved so much that objects fall out of the universe –Escape velocity = speed of light Black Holes and Einstein’s Theory of Relativity
Maxwell’s Equations 1st equation: 2 nd equation: Determines total flow of electric charge out from closed surface Cover surface with patches of area of dA (represented as vectors), use dot product to find component of field that points in outward direction (only component that matters) Net magnetic flux is 0 Magnetic flux – product of magnetic field and area it goes through; integral of vector quantity (magnetic force) over surface
Maxwell’s Equations (cont’d) 3rd equation: Line integral – products of vector functions of electric and magnetic field Equation says line integral of electric field around closed loop is equal to negative rate of change of magnetic flux
Maxwell’s Equations (cont’d) 4 th equation: Light was in form of electromagnetic wave
How are Maxwell’s Equations Related to Black Holes? Moving electric field creates magnetic vortex Electromagnetic radiation – from charged particles that move towards black hole Light affected by extremely strong gravity Black hole is large magnetic field b/c electric field created when charge falls into black hole
Using Riemannian Manifolds to Describe Curvature Manifolds describe complex structures of non-Euclidian space within the context of Euclidian space using mathematical equations Riemannian manifolds are real differentiable manifolds that use angles Black holes are mapped into more simple structures using Riemannian manifolds
Equations Modeling Black Hole Curvature The Schwarzschild Metric Equation
Equations Modeling Black Hole Curvature The Schwarzschild Metric Equation (Continued)
Equations for Escape Velocity and Gravitational Force Gravitational Energy would have to equal kinetic energy Force as mass becomes infinite and radius 0
Significance of Change in Radius in Relation to Curvature Curvature is the deviation of an object from being flat A smaller radius has more curvature and vice versa Therefore, black holes with smaller radii have more curvature
Behavior and Emissions of a Black Hole Electromagnetic radiation comes from charged particles that move towards black hole Black hole is large magnetic field b/c electric field created when charge falls into black hole
Photon and Gamma Particle Radiation from Black Holes Black holes emit thermal radiation at temperature – = reduced Planck constant c = speed of light K = Boltzmann constant G = gravitational constant M = mass of black hole Unlike most objects, the temperature of a black hole increases as it radiates away mass
Gravitational Force Considerations Black holes become impossible to escape as it approaches the event horizon as the escape velocity required, regardless of mass, equals the speed of light Relativity, as c is constant, in order for energy to increase towards infinite, mass = infinite
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