Page 3 of 3 FirstFirst 123
Results 21 to 22 of 22
  1. #21
    DanielC's Avatar
    DanielC is offline SUPER GIANT
    Points: 6,189, Level: 54
    Level completed: 20%, Points required for next Level: 161
    Overall activity: 0%
    Ghost Achievement! Averaging 5+ posts a day!200+ Posts Achievement!Got three Friends400+ Posts Achievement5 Threads Achievement!
    Join Date
    Jun 2011
    Sweden, Earth
    Thanked 1,152x 636 Posts


    Quote Originally Posted by BABOafrica View Post
    I have always been suspicious of "inflation". I see it as a mathematical "fix" for BB theory. I find it hard to swallow the notion that space expands.
    Some skepticism of inflation is healthy, that said, I think you are in for a shock: You don't even need inflation to get space expanding. The entire Big Bang theory is about space expanding. The entire Robertson-Walker metric (which describes a homogeneous universe) is about space expanding or contracting.

    That said, this might make you feel a little better: If you accept the notion that "gravity" is curved space time, and that mass can stretch and bend space time, then maybe it is not so weird to think that the entire universe might stretch as well.

    Now, mind you, I'm the kind of person who is suspicious of imaginary numbers because I think taking the square root of -1 is a neat mathematical trick but, in reality, a trick that allows us only the limited power of manipulating numbers without really knowing what we are doing. Therefore, I am suspicious of the "knowledge" that is gleaned from theories that depend on it.
    If it makes you feel better, you can replace imaginary numbers with matrix algebra to derive all the same mathematical results. Consider the following matrix:

    [ 0 -1 ]
    [ -1 0 ] = "imag"

    And the identity matrix

    [ 1 0 ]
    [ 0 1 ] = "one"

    Then clearly, imag * imag = - one

    Now you can re-derive all the results from complex algebra in the language of matrices.
    Astronomer. Lund Observatory

    Current project: Formation of terrestrial planets.
    Previous project: Dark matter capture in binary stars.
    Previous project: Observational history of planetary systems.
    Previous project: Contributions to the GNU Fortran Compiler.

  2. The Following 2 Users Say Thank You to DanielC For This Useful Post:

    BABOafrica (07-08-2011),chas53 (07-07-2011)

  3. #22
    BABOafrica's Avatar
    BABOafrica is offline Moderator
    Points: 66,546, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    200+ Posts Achievement!First 1000 Experience Points400+ Posts Achievement365 Days+ Registered Achievement!5 Threads Achievement!
    Join Date
    May 2011
    Nairobi, Kenya
    Thanked 3,251x 2,873 Posts


    Just want to say that I am especially grateful for the insight on the matrix maths as a logical way of thinking our way through the business of imaginary numbers.

    The Robertson-Walker metric is also completely new to me, so I'll have to look into that.

    Many thanks,
    In lumine tuo videbimus lumen

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    : WO ZenithStar SD f/5.9 66mm APO -- Meade f/9 102mm APO -- Celestron SCT C8 -- Sigma f/5.6 400mm APO lens
    MOUNT: Celestron AVX & Atlas EQ-G

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    CAMERA: Fujifilm X-A1 (mirrorless) / Orion-SSAG

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    : DSS -- StarTools -- GIMP -- Bahtinov Grabber 64

  4. The Following User Says Thank You to BABOafrica For This Useful Post:

    chas53 (07-08-2011)


Page 3 of 3 FirstFirst 123

Similar Threads

  1. Hi from a soon to be amateur astronomer.
    By Heathius in forum Forum Welcomes Introductions
    Replies: 8
    Last Post: 04-01-2011, 07:56 AM
  2. Amateur Astronomer
    By akash_universe in forum Forum Welcomes Introductions
    Replies: 6
    Last Post: 12-07-2010, 02:42 PM
  3. new amateur astronomer
    By Rasalhague in forum Forum Welcomes Introductions
    Replies: 6
    Last Post: 08-13-2010, 07:51 PM
  4. Replies: 0
    Last Post: 05-12-2008, 04:38 AM
  5. An amateur astronomer perhaps?
    By Rich in forum Amateur Astronomy Forum
    Replies: 1
    Last Post: 12-25-2006, 10:55 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
Powered by vBulletin® Version 4.2.0
Powered by vBulletin®
All times are GMT. The time now is 08:36 PM.