Can this be another reason for dark energy?

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Discussion Overview

The discussion revolves around the nature of dark energy and its potential relationship to the initial conditions of the big bang. Participants explore whether dark energy could be interpreted as a remnant of the initial force and energy from the big bang, particularly in the context of gravitational effects over time.

Discussion Character

  • Exploratory
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • One participant suggests that the initial force and energy from the big bang could lead to an observed acceleration of cosmic objects due to decreasing gravitational attraction over time.
  • Another participant counters that the initial force of the big bang would not result in acceleration, emphasizing that the acceleration attributed to dark energy was unexpected.
  • A later reply argues that the proposed hypothesis would not lead to accelerating expansion but rather a decreasing expansion rate, which was the expectation prior to the 1990s.
  • Some participants note that observations indicate an increasing acceleration rate, suggesting the presence of additional energy, which is referred to as dark energy.
  • There is a mention that the current era of the universe, approximately 13.8 billion years after the big bang, is characterized by dark energy prevailing over gravity, leading to the observed accelerating expansion.

Areas of Agreement / Disagreement

Participants express disagreement regarding the relationship between the big bang and dark energy, with some supporting the idea that dark energy is a separate phenomenon that cannot be solely attributed to the initial conditions of the universe. The discussion remains unresolved with multiple competing views.

Contextual Notes

Some claims rely on assumptions about gravitational effects over cosmic time and the nature of dark energy, which are not fully explored or agreed upon in the discussion.

Inderjeet Singh
Suppose the initial force and energy bursting out during big bang was very huge . The matter just after big bang would have been very close , so the gravitational attraction would have been very high , which would have caused the acceleration produced by big bang to decrease . As time increased , gravity between cosmological objects decreased ( due to increase of distance caused by initial acceleration of big bang ) . As gravity is the only major force between objects getting apart at a constant velocity , and it is decreasing , then an observer would notice that the objects are accelerating apart . That is what we know today ! . I just want to ask if dark energy is nothing but the initial force of big bang which seems to accelerate due to decrease of gravity ?

Ps – Sorry for my bad explanation skill :)
 
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Inderjeet Singh said:
I just want to ask if dark energy is nothing but the initial force of big bang which seems to accelerate due to decrease of gravity ?
No it is not. There would be NO acceleration due to the force of the BB (I mean, think about it) which is why, when the acceleration was first noticed (and attributed to the mysterious "dark energy") everyone was quite surprised.

Also, you might find it instructional to stop and think about whether you have come up with an idea that has eluded THOUSANDS of serious professional physicists.
 
Inderjeet Singh said:
Suppose the initial force and energy bursting out during big bang was very huge . The matter just after big bang would have been very close , so the gravitational attraction would have been very high , which would have caused the acceleration produced by big bang to decrease . As time increased , gravity between cosmological objects decreased ( due to increase of distance caused by initial acceleration of big bang ) . As gravity is the only major force between objects getting apart at a constant velocity , and it is decreasing , then an observer would notice that the objects are accelerating apart . That is what we know today ! . I just want to ask if dark energy is nothing but the initial force of big bang which seems to accelerate due to decrease of gravity ?

Ps – Sorry for my bad explanation skill :)
Welcome to the PF. :smile:

Please keep in mind that we do not discuss personal theories here on the PF. It is fine to phrase it in the form of a question, but proposing new mechanisms for observed phenomena is not allowed. Thanks.
 
Your hypothesis would not result in accelerating expansion,
It would result in an expansion rate that gradually decreases over time, and could possibly reverse in the future.
Prior to the 1990's this is what many astronomers expected they would observe when a new generation of more powerful telescopes went into service.
Instead the observations indicated that the acceleration rate actually is increasing over time.
That implies additional energy coming into existence after the initial big bang, and that's what got the name dark energy.
 
Last edited:
Inderjeet Singh said:
As gravity is the only major force between objects getting apart at a constant velocity , and it is decreasing , then an observer would notice that the objects are accelerating apart .
You mean expanding with a decreasing rate.
That would be the case if there was no dark energy. Then, the accelerating rate (or better said "expansion rate") would be decreasing.
rootone said:
Instead the observations indicated that the acceleration rate actually is increasing over time.
rootone said:
That implies additional energy coming into existence after the initial big bang, and that's what got the name dark energy.
Exactly!
Thus we just happen to live in that time era and age of the universe (i.e. ≅ 13.8 billion years after the big bang) where dark energy prevails over gravity and that's why we observe accelerating expansion of the universe. (That effect had already started roughly 5 billion years ago, or approximayelly 8.8 billion years after the big bang ...)
https://en.m.wikipedia.org/wiki/Accelerating_expansion_of_the_universe

Note: current "precise" measurement of the age of the universe is (13.799 ± 0.021) billion (i.e. 109) years.
( https://en.m.wikipedia.org/wiki/Age_of_the_universe )
 

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