All Questions
95
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Was "flow of time" equally fast during the life of universe? Is Doppler Effect the only interpretation of "shift to red"? [duplicate]
I'm an IT developer and recently I created a project where I tried to send signals between two threads in a slowing down environment. I simulated two points with their own clocks and tried to send a ...
- 101
2
votes
0
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76
views
An unusual calculation of our universe's age? [closed]
Does the following make sense? And has anyone else come
across this odd ~’cosmological coincidence’ before?…
…If we posit that our total universe mass is:
(1) $$M_{U}=\frac{{M_{pl}}^4}{{M_{p}}^...
- 149
2
votes
5
answers
503
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What is the branch of physics that asks the question 'what was before the Big Bang'?
What is the branch of physics that asks the question 'what was before the Big Bang', assuming the Big Bang is truly what happened at the beginning of the universe? If there could be a better model ...
- 421
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0
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39
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Planck time - what would I see? [duplicate]
Impossibly hypothetical, but to communicate the question: when the universe "ticks" a plank second, what does a particle do? I'd imagine the natural conception that it moves from position a ...
- 149
-2
votes
2
answers
95
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Since the instant of the big bang, has the progression of the universe been entirely determined?
[Note I am asking up to, but not including, consciousness as this bleeds into philosophy and is a much messier question]
Assuming that the laws of physics have remained constant across space & ...
- 460
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0
answers
23
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Is the size/age of the universe dependent on your velocity? [duplicate]
As Photons do not experience time or space, then according to my thought experiment, all photons must occupy some kind of singularity as well as what WE observe from earth.
I was also thinking that ...
1
vote
2
answers
106
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In spacetime time is a coordinate. Does it mean there is a single objective timeline for the Universe?
If every event can be defined with x, y, z, t coordinates - does it mean all events with the same t are composing the whole Universe at the moment t?
0
votes
1
answer
276
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Is heat death absolutely and really inevitable? [duplicate]
As the second law of thermodynamics indicates, entropy would continue to grow in the universe until it reaches a maximal value (in an expanding universe with a cosmological constant, like ours) or ...
- 2,462
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votes
1
answer
46
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Average Time since the Big Bang
Can we define an average time for the entire universe relative to the Big Bang and call this the universal time since the beginning of the universe? (time, averaged relative to all possible reference ...
- 613
-3
votes
1
answer
80
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Photons that escape the universe [closed]
According to my current understanding of special relativity, photons do not experience the passage of time. It is as though the universe is completely 'paused' for them. I know that objects with mass ...
- 23
-1
votes
1
answer
104
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If Inflation never happened before the CMB, and the present expansion were projected backwards, how old would the Universe be since the Big Bang?
The Cosmic Microwave Background Radiation is the oldest thing we can directly observe. To explain the near uniformity of temperature of the CMBR and the flatness of space, Cosmic Inflation was ...
- 11
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0
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51
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Was Big Bang the "START" of time? [duplicate]
I know that this question has been repeated a lot. But I still don't understand this concept.
Big bang created matter and space but how could it possibly create time?
If Big bang didn't create time ...
- 77
0
votes
1
answer
108
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Could the passage of time be sinusoidal? [closed]
As we know the universe is moving towards an equilibrium, or high state of entropy. From what I understand, we call this the flow of time.
When google announced their time crystal, they call it "...
0
votes
2
answers
453
views
Calculation of age of Universe
The age of the Universe is about 13.8 billion years, measured by light emitted from the time it emerged from opaqueness. But how was the time from the "beginning" to 380,000 years (era of ...
- 303
3
votes
1
answer
236
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Deriving the age of the universe
I am trying to work out the solution to exercise 8.4 from An Introduction to Modern Cosmology by Andrew Liddle. I could derive the Friedmann equation as below,
$$\dot{a}^2 = H_0^2 \left[\Omega_0a^{-1} ...
