Go Back   Physics Help Forum > Physics Forums > Philosophy of Physics

Philosophy of Physics Philosophy of Physics Forum - Philosophical questions about our universe

Reply
 
LinkBack Thread Tools Display Modes
Old Jun 19th 2008, 08:54 PM   #1
Senior Member
 
Join Date: Apr 2008
Location: HK
Posts: 886
Thought experiment

The existence of parallel universe is proved somehow by thought experiment. Imaginary situation is set and then someone would ask and answer the question. But I would like to know when answering the questions, are the answers simply judged by the physics knowledge and guesses of the one who asks the questions? As there is always limitation on the physics knowledge.

Then there is a problem, in real world, we can never prove the imaginary situation by real experiment. Then thought experiment is just like stories make up by physicists even though the sayings may be sensible, is it?
werehk is offline   Reply With Quote
Old Jun 20th 2008, 04:10 AM   #2
Forum Admin
 
topsquark's Avatar
 
Join Date: Apr 2008
Location: On the dance floor, baby!
Posts: 2,454
Originally Posted by werehk View Post
The existence of parallel universe is proved somehow by thought experiment. Imaginary situation is set and then someone would ask and answer the question. But I would like to know when answering the questions, are the answers simply judged by the physics knowledge and guesses of the one who asks the questions? As there is always limitation on the physics knowledge.

Then there is a problem, in real world, we can never prove the imaginary situation by real experiment. Then thought experiment is just like stories make up by physicists even though the sayings may be sensible, is it?
Physics is built of "models." These models help us describe physical phenomena, always employing the use of Mathematics to quantify it. A thought experiment is one in which a new model is tested based on how much sense it makes in comparison with what we already know. The only use of the "results" of a thought experiment is to make a prediction that can be tested by research. You could probably describe the theoretical process of producing a hypothesis (as opposed to using experimental data to do so) entirely as thought experiments.

But make no mistake: any results of a thought experiment really need to be backed by experimental data before it can be accepted as a real result. (Though many Physicists will talk about their theoretical results as being real even though there is no proof. This bad habit is particularly common among particle Physicists.)

-Dan
__________________
Do not meddle in the affairs of dragons for you are crunchy and taste good with ketchup.

See the forum rules here.
topsquark is offline   Reply With Quote
Old Nov 11th 2009, 12:29 AM   #3
Junior Member
 
Join Date: Nov 2009
Posts: 1
Originally Posted by werehk View Post
The existence of parallel universe is proved somehow by thought experiment. Imaginary situation is set and then someone would ask and answer the question. But I would like to know when answering the questions, are the answers simply judged by the physics knowledge and guesses of the one who asks the questions? As there is always limitation on the physics knowledge.

Then there is a problem, in real world, we can never prove the imaginary situation by real experiment. Then thought experiment is just like stories make up by physicists even though the sayings may be sensible, is it?
Hi all!
I've just visited this forum. Happy to get acquainted with you. Thanks.
__________________
Free Anime Episodes
hcm2009 is offline   Reply With Quote
Old Dec 26th 2009, 01:19 PM   #4
Pmb
Physics Team
 
Join Date: Apr 2009
Location: Boston's North Shore
Posts: 1,568
Originally Posted by werehk View Post
The existence of parallel universe is proved somehow by thought experiment.
Where did you get that idea from?
Pmb is online now   Reply With Quote
Old Dec 27th 2009, 08:54 PM   #5
Senior Member
 
Join Date: Apr 2008
Location: HK
Posts: 886
The idea came from an article of Wikipedia if I remember correctly
__________________
Good results were achieved and the new task is to become a good doctor.
werehk is offline   Reply With Quote
Old Feb 14th 2010, 08:12 AM   #6
Pmb
Physics Team
 
Join Date: Apr 2009
Location: Boston's North Shore
Posts: 1,568
Originally Posted by werehk View Post
The idea came from an article of Wikipedia if I remember correctly
I know where there idea came from. I was asking where he got the idea that it's been proved. It is merely speculation/an hypothesis at this point.
Pmb is online now   Reply With Quote
Old Jun 4th 2013, 09:30 AM   #7
MBW
Senior Member
 
MBW's Avatar
 
Join Date: Apr 2008
Location: Bedford, England
Posts: 668
proof by thought experiment

In my view a key purpose of thought experiments is to explore the self-consitency of a concept.
If an idea is not even consistent within itself, it must be wrong.

Thus while I agree that a thought experiment cannot prove a theory without actual experiment to back it up,
it can perhaps be used to dis-prove a theory without requiring actual experimental verification.
MBW is offline   Reply With Quote
Old Jun 4th 2013, 01:17 PM   #8
Senior Member
 
Join Date: Jun 2010
Location: NC
Posts: 402
Philosophy of Physics Help Forum...

Is there a thread... about the owner's purpose, bounds of collaborative effort, site momentum (a vector)... and all that -of PHF?
THERMO Spoken Here is offline   Reply With Quote
Old Jun 5th 2013, 12:38 PM   #9
Forum Admin
 
topsquark's Avatar
 
Join Date: Apr 2008
Location: On the dance floor, baby!
Posts: 2,454
Originally Posted by THERMO Spoken Here View Post
Is there a thread... about the owner's purpose, bounds of collaborative effort, site momentum (a vector)... and all that -of PHF?
Yes, but it's a mish-mash....Get it? "mash?" Ah well.

-Dan
__________________
Do not meddle in the affairs of dragons for you are crunchy and taste good with ketchup.

See the forum rules here.
topsquark is offline   Reply With Quote
Old Aug 27th 2013, 01:36 PM   #10
Senior Member
 
Troll's Avatar
 
Join Date: Aug 2013
Location: Under a bridge, Tampa, Florida USA
Posts: 157
If time and space had no beginning and no end (which is my personal belief) everything that is possible, would be... with an infinite number of occurences!

So, plenty of parallel "universes".
Troll is offline   Reply With Quote
Reply

  Physics Help Forum > Physics Forums > Philosophy of Physics

Tags
experiment, thought



Thread Tools
Display Modes


Similar Physics Forum Discussions
Thread Thread Starter Forum Replies Last Post
A thought experiment with speed of light tonzent Theoretical Physics 10 Nov 17th 2014 08:36 AM
Is this experiment possible? Troll Theoretical Physics 4 Nov 26th 2013 11:46 AM
Thought experiment "small box and only one body inside the universe " tesla2 Theoretical Physics 2 Jun 11th 2013 06:52 AM
" my thought " discussion Marshallaw4 Quantum Physics 0 May 25th 2012 08:39 AM
Experiment? Sean12345 Nuclear and Particle Physics 2 Apr 16th 2008 06:31 AM


Facebook Twitter Google+ RSS Feed