Black holes the information paradox
Download
1 / 15

Black Holes: The Information Paradox - PowerPoint PPT Presentation


  • 365 Views
  • Updated On :

Black Holes: The Information Paradox. Andrew Buccilli PH2010 Sophomore Seminar. October 26, 2007. What is a Black Hole?. Region of extremely dense packed matter Gravity so strong that nothing can escape it Gravitation balances EM radiation. Sizes. 1. Supermassive Black Holes

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Black Holes: The Information Paradox' - LeeJohn


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
Black holes the information paradox l.jpg

Black Holes:The Information Paradox

Andrew Buccilli

PH2010 Sophomore Seminar

October 26, 2007


What is a black hole l.jpg
What is a Black Hole?

  • Region of extremely dense packed matter

  • Gravity so strong that nothing can escape it

  • Gravitation balances EM radiation


Sizes l.jpg
Sizes

1. Supermassive Black Holes

  • millions to billions of times the mass of our sun

  • believed that most galaxies contain one at their galactic center

  • the slow acceleration of matter is one way of formation


Slide4 l.jpg

2. Intermediate-Mass Black Hole

  • mass is significantly more than SBH yet far less than SMBH

  • less evidence for existence

    • not clear how they form

      • too massive

      • lack extreme environment

        conditions

        3. Stellar Black Hole

  • at least 1.5 solar masses

  • largest is 17.5 solar masses

  • formed by gravitational

    collapse of massive star


Slide5 l.jpg

4. Quantum Mechanical Black Hole

  • BH could exists at any mass in theory

    • lower mass, higher density of matter

  • Smallest mass is the plank mass

    • ~2 × 10^−8 kg

    • less mass: inconsistent and incomplete

  • BH mass < few times solar mass

    • no know processes to produce

  • Brian Greene (PhD. at Oxford University)

    • electron might be a micro black hole

      • mass, charge, spin

  • Note:Primordial black hole

    • extreme density of matter


  • Black holes have no hair l.jpg
    Black Holes Have No Hair

    • Complicated formation- Simple stationary state

    • Can be characterized by:

      • Mass

      • Angular momentum

      • Electric charge

    • Same properties

      • Unknown how formed

        • i.e. matter or antimatter


    Event horizon l.jpg
    Event horizon

    • Boundary of the region of escape

      • WARNING: “point of no return”

    • Not a solid surface

      • does not obstruct or slow down matter

    Singularity

    • Point where mass is entirely compressed

      • zero Volume

      • infinite gravitational pull and density

    • General relativity breaks down


    Vacation through a black hole l.jpg
    Vacation Through a Black Hole

    • Traveling through [T] - Outside observer [O]

      • [T] approaches “c” approaching BH

      • [T] experiences nothing abnormal through horizon

      • [O] sees [T] acting in a bizarre way

    • Spaghettification

      • Newton’s law of gravitation explains principles

    • [T] appears to slow down

    • [T] is spaghettified

    • [O] never sees anything inside the horizon

      • [T] appears flattened and frozen at horizon

    • [T] sees nothing unusual until reaching the singularity

      • All components of [T] are torn before striking

      • At the singularity- ?????????


    Hawking radiation l.jpg
    Hawking Radiation

    • Black holes slowly radiate away energy

      • Increases as mass decreases

    • Not actually black

    • Particle- antiparticle pair

      • both pulled in

      • both escape

      • one pulled in one escapes

    • BH lost minute amount of mass

      • radiation comes from the horizon


    Slide10 l.jpg

    • The Beautiful Equation

      • Thermodynamics

      • Gravity

      • Quantum Physics

      • Relativity

    • Eventually a BH will radiate away all of its mass

      • Only thermal energy would remain

    • There is trouble on the horizon…


    The information paradox l.jpg
    The Information Paradox

    • Physics doesn’t work?!

    • Conservation of energy

      • Reversibility

        • Information cannot be destroyed



    Black hole complementarity l.jpg
    Black Hole Complementarity

    • Opposing point

      • Info. never reached the horizon

        • Vaporized and radiated

    • Vacation revisited

      • Person falling in would

        be dead and alive?

    • Both points are true

    • String Theory

      • Agrees with both observers



    Our memories are safe l.jpg
    Our Memories Are Safe?

    • Parallel universes

    • Quantum gravity