Can spacetime be created ? if yes how if not why ?

  • Context: Graduate 
  • Thread starter Thread starter tell_me_why
  • Start date Start date
  • Tags Tags
    Spacetime
Click For Summary

Discussion Overview

The discussion centers around the concept of spacetime, specifically whether it can be created or destroyed, and the implications of such a possibility. Participants explore theoretical aspects related to cosmology, general relativity, and the nature of time within the framework of spacetime.

Discussion Character

  • Exploratory
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • One participant questions whether spacetime can be created, suggesting that it exists virtually and is related to gravity through its warping.
  • Another participant notes that current cosmological models indicate a singularity at the big bang, where general relativity breaks down, leaving uncertainty about the existence of time before the big bang.
  • A participant references historical perspectives on gravity, highlighting that while Einstein's theory of general relativity explains how mass curves spacetime, it does not answer why this occurs.
  • There is a philosophical dimension to the questions posed, with one participant arguing that the inquiry into the creation or destruction of spacetime may not be scientifically meaningful.
  • Another participant expresses confusion about the relationship between time and the curvature of spacetime, suggesting that changes in time are a result of the warping of spacetime itself.
  • One participant prompts others to consider external resources for further context on the discussion.

Areas of Agreement / Disagreement

Participants express differing views on the nature of spacetime and its potential for creation or destruction. There is no consensus on these questions, and the discussion remains unresolved.

Contextual Notes

Participants highlight limitations in current understanding, particularly regarding the singularity at the big bang and the philosophical implications of the questions raised. There is also a noted ambiguity in the definitions and assumptions surrounding spacetime and its properties.

tell_me_why
Messages
12
Reaction score
0
Can spacetime be created ? if yes how if not why ?

I understand that spacetime is not physical and more of geometry.
Still bec it exist virtualy ,as gravity depends on warping of spacetime.
So can we ever create this spacetime , does it existing before big bang ??
 
Physics news on Phys.org


In the current cosmological models, the cosmological constant is small enough that a singularity occurs at the big bang. This singularity represents a point where general relativity breaks down and loses self-consistency. Therefore we don't have any theory that allows us to say whether there was time before the big bang.

If the universe is spatially closed, then its spatial volume is finite and increasing over time.

If the universe is spatially open, then its spatial volume is infinite, so we can't really say whether the total volume increases over time. For a discussion of whether space should then be considered as expanding, see section 7.2.3 of http://www.lightandmatter.com/html_books/genrel/ch07/ch07.html#Section7.2 , or, for more detail, http://arxiv.org/abs/0808.1081v2 and http://arxiv.org/abs/0707.0380v1 .
 
Last edited by a moderator:


Newton said that two masses attact each other but no one know why and how..
decades after A. einstein said masses curve spacetime and puposed theory of GR.
though his theory seems to be correct at the moment but again no one knows

1) why mass curve spacetime ?
2) can spacetime be created or destroyed ?
3) how time is created in spacetime and why it changes dependiing on curvature of spacetime ?

--------------------------------------------------------------
 


tell_me_why said:
1) why mass curve spacetime ?
2) can spacetime be created or destroyed ?
3) how time is created in spacetime and why it changes dependiing on curvature of spacetime ?

1) This question has the tone of philosophy, not science. You can keep asking "why?" forever, and science will not be able to provide an infinite string of answers. We've got to start somewhere.


2) This question, to me, is about as meaningful as asking "Can a cartesian coordinate system be created or destroyed?" or "Can the number two be created or destroyed?"

3) This one confuses me. Time is changed by the curvature of spacetime precisely because spacetime is just that: space AND time. So when spacetime curves, space and time both warp.
 


tell_me_why said:
2) can spacetime be created or destroyed ?
3) how time is created in spacetime and why it changes dependiing on curvature of spacetime ?

Have you looked at the three links I gave?
 

Similar threads

High School Does Spacetime Have Physical Existence?
  • · Replies 58 ·
2
Replies
58
Views
4K
Graduate The Causal Bootstrap Paradox in General Relativity
  • · Replies 10 ·
Replies
10
Views
1K
Undergrad Physical meaning of null spacetime interval
  • · Replies 35 ·
2
Replies
35
Views
7K
High School What Causes Mass to Exert Gravitational Pull?
  • · Replies 1 ·
Replies
1
Views
2K
High School Implications of negative Michelson-Morley result
  • · Replies 12 ·
Replies
12
Views
2K
Undergrad How Does Mass Influence Spacetime Curvature?
  • · Replies 13 ·
Replies
13
Views
2K
Undergrad Proof of Invariance of Spacetime Interval
  • · Replies 6 ·
Replies
6
Views
2K
Undergrad How Is Intrinsic Curvature Measured in Higher Dimensions Like 4D Spacetime?
  • · Replies 19 ·
Replies
19
Views
2K
Undergrad How can the volume of a star be determined?
  • · Replies 10 ·
Replies
10
Views
2K
Undergrad Can there be a maximum curvature of spacetime?
  • · Replies 9 ·
Replies
9
Views
2K