What is the present, how long does it last?

  • Context: Graduate 
  • Thread starter Thread starter lemd
  • Start date Start date
Click For Summary

Discussion Overview

The discussion revolves around the concept of the present moment in the context of relativity and quantum physics, specifically questioning its duration and meaning. It explores the intersection of physics and philosophy regarding the nature of time and perception.

Discussion Character

  • Exploratory
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • Some participants question the definition of the present moment, suggesting it may be a "point" in time with zero duration, similar to a "point particle" in space.
  • There is uncertainty about whether time is discrete, with some participants noting that discussions exist around the possibility of time being quantized, potentially at a scale smaller than Planck time.
  • One participant raises concerns about the implications of discretizing space-time, arguing that it could violate Lorentz invariance.
  • Another participant suggests that the question of the present moment may be more philosophical than scientific, indicating a belief that it falls outside the scope of current physics.

Areas of Agreement / Disagreement

Participants express differing views on the nature of the present moment, with no consensus reached on its definition or duration. The discussion remains unresolved, with competing perspectives on whether the topic is scientific or philosophical.

Contextual Notes

The discussion highlights limitations in the current understanding of time, including assumptions about its continuity or discreteness, and the philosophical implications of these concepts.

lemd
Messages
31
Reaction score
0
According to relative theory and quantum physics, what is the present moment? How long does it last?

What is the meaning of the present tense that human feel in the sense of quantum/ relative physics? Is that we are seeing the Plank time moment to moment?
 
Physics news on Phys.org
lemd said:
According to relative theory and quantum physics, what is the present moment? How long does it last?

What is the meaning of the present tense that human feel in the sense of quantum/ relative physics? Is that we are seeing the Plank time moment to moment?

I think "present" is a word in the English language that is not well suited to physics other than to say that it is a "point" in time (having zero duration) just like a "point particle" has no dimensions in space.

As to your question about "... Plank time moment to moment?" I'm not really sure how you mean that. We have no evidence one way or the other as to whether or not time is discrete and if it DOES turn out to be discrete, what the "quantum" of time might be. I've heard discussions saying that it certainly would be much less than one Plank time.
 
discretization of space-time is problematic because it violates Lorentz invariance.
 
lemd said:
According to relative theory and quantum physics, what is the present moment? How long does it last?

What is the meaning of the present tense that human feel in the sense of quantum/ relative physics? Is that we are seeing the Plank time moment to moment?

This is not a question that science attempts to answer. This question currently belongs in the realm of philosophy than actual physics. Thus I'm going to lock this thread.
 

Similar threads

  • · Replies 32 ·
2
Replies
32
Views
4K
  • · Replies 10 ·
Replies
10
Views
1K
  • · Replies 10 ·
Replies
10
Views
1K
  • · Replies 9 ·
Replies
9
Views
813
Replies
90
Views
11K
  • · Replies 5 ·
Replies
5
Views
1K
  • · Replies 9 ·
Replies
9
Views
2K
  • · Replies 15 ·
Replies
15
Views
3K
  • · Replies 84 ·
3
Replies
84
Views
5K
  • · Replies 20 ·
Replies
20
Views
2K