Notices
Results 1 to 5 of 5

Thread: Questions about Gravitons

  1. #1 Questions about Gravitons 
    New Member
    Join Date
    Apr 2014
    Posts
    1
    Hey guys,
    I have a couple of questions regarding Gravitons:
    1.If found, will the Graviton's existence negate General Relativity's explanation of what gravity is? i.e. if Gravitons are the mediators of the Gravity Force, space doesn't need to be curved in order the explain the attractions between a Star and its planets (e.g.) thus GE's explanation is wrong.

    2. When a light particle "hits" an electron, Thomson style, the light adds to the electron's momentum and pushes it away. Gravitons, if exist, suppose to do the exact opposite, so how do they create the attraction? in short, what is the Graviton's mechanism?

    3. If Gravitons do exist, how can they escape a Black Hole? I've read that virtual gravitons are the solution to this question, but can someone please elaborate?
    Thanks!

    4. How do Gravitons relate to the Time Dilation and Frame Dragging phenomenas?

    Thanks!


    Reply With Quote  
     

  2.  
     

  3. #2  
    Forum Professor Zwolver's Avatar
    Join Date
    May 2006
    Location
    Netherlands
    Posts
    1,667
    From what i have heard here on this forum, gravitons, theoretical in all aspect, and even beyond theoretical. It is used in some models to explain the flow of energy from the universe. Gravitons would purposely set the balance straight for replacing the kinetic energy that gravity radiates.

    I doubt general relativity will be proven wrong by existence of gravitons. General relativity has proven to be correct and it only bended slightly over the years.

    I If gravitons exist, they can't have mass, surface, or any noticeable energy we can measure. So there is no way to know.


    4.. They could assist in bending the space around a fast travelling object, so decreasing the elementary energy of that piece of space, thus making matter vibrate slower. But this can't be proven, it was a brainfart, hehe..


    Growing up, i marveled at star-trek's science, and ignored the perfect society. Now, i try to ignore their science, and marvel at the society.

    Imagine, being able to create matter out of thin air, and not coming up with using drones for boarding hostile ships. Or using drones to defend your own ship. Heck, using drones to block energy attacks, counterattack or for surveillance. Unless, of course, they are nano-machines in your blood, which is a billion times more complex..
    Reply With Quote  
     

  4. #3  
    Suspended
    Join Date
    Feb 2013
    Posts
    1,774
    Quote Originally Posted by Zwolver View Post


    4.. They could assist in bending the space around a fast travelling object, so decreasing the elementary energy of that piece of space, thus making matter vibrate slower. But this can't be proven, it was a brainfart, hehe..
    Yep, it is a brainfart, why do you feel compelled to do them in public?
    Reply With Quote  
     

  5. #4  
    Moderator Moderator Janus's Avatar
    Join Date
    Jun 2007
    Posts
    2,208
    Quote Originally Posted by shmulik View Post

    3. If Gravitons do exist, how can they escape a Black Hole? I've read that virtual gravitons are the solution to this question, but can someone please elaborate?
    Thanks!
    First you have to understand the relationship between the graviton and the gravitational force. The graviton would be a quantum of gravitational radiation. Gravitational radiation is not the same as gravitational force. Gravitational radiation is more like ripples in the gravity field, it carries information about changes in the field, but is not responsible for the gravity force.

    The graviton would fulfill the same roll in gravity as the photon does with electromagnetism. The photon is a quantum of electromagnetic radiation. It is a ripple in the electromagnetic field.

    So, in the same way that you can draw an object towards you by shining a flashlight(which generates photons) on it. You cannot attract objects with gravitons.

    However, in quantum field theory, the electromagnetic field( and thus the electromagnetic force) is maintained by the exchange of virtual photons. In the same way, a quantum gravity theory would have the gravity field as being due to the exchange of virtual gravitons.

    The thing about virtual particles is that they can pop in and out of existence in what appears to be in violation of conservation laws. They just do it so quickly that you can never catch them at it. As a result, they aren't bound by some of the limitations real photon and gravitons are. They can escape a black hole's event horizon and cause a gravity field.
    "Men are apt to mistake the strength of their feelings for the strength of their argument.
    The heated mind resents the chill touch & relentless scrutiny of logic"-W.E. Gladstone


    Edit/Delete Message
    Reply With Quote  
     

  6. #5  
    Moderator Moderator Markus Hanke's Avatar
    Join Date
    Nov 2011
    Location
    Ireland
    Posts
    7,302
    Quote Originally Posted by Janus View Post
    The graviton would fulfill the same roll in gravity as the photon does with electromagnetism.
    Yes, precisely correct. The problem with this is that while this works just fine in QED, if you attempt the same with gravity you find that the resulting field theory is not renormalisable, which makes it physically useless.
    Reply With Quote  
     

Similar Threads

  1. The Purpose of Gravitons?
    By skb8721 in forum Physics
    Replies: 3
    Last Post: March 14th, 2013, 04:27 AM
  2. Why do we need Gravitons?
    By Wildstar in forum Physics
    Replies: 11
    Last Post: February 23rd, 2012, 04:09 AM
  3. How many dimensions does gravitons have?
    By LeavingQuietly in forum Pseudoscience
    Replies: 2
    Last Post: September 8th, 2007, 04:46 AM
  4. gravitons
    By krishna in forum Astronomy & Cosmology
    Replies: 2
    Last Post: January 1st, 2006, 08:16 PM
  5. would gravitons have a velocity greater then photons?
    By phephiphophum in forum Astronomy & Cosmology
    Replies: 48
    Last Post: November 23rd, 2005, 09:04 AM
Tags for this Thread

View Tag Cloud

Bookmarks
Bookmarks
Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •