All Questions
Tagged with cosmology quantum-mechanics
132
questions
-1
votes
1
answer
107
views
Does the Many worlds interpretation of quantum mechanics imply the existence of all conceivable worlds? [closed]
what I mean by this is, does every universe conceivable exist? would any universe i think of exist? could there be a universe of nothingness? are there universes of TV shows? are there universes with ...
- 19
3
votes
1
answer
199
views
Why is the homogeneity problem actually a problem?
I don't mean to be flippant but I have never understood why the homogeneity in the universe needs.explaining. I have searched other questions on stack exchange and they don't really address the ...
- 1,087
0
votes
1
answer
73
views
Are any present particles entangled due to their common origin in the big bang?
Are any present particles entangled due to their common origin in the beg bang? Have they been too transformed to be entangled or never entangled to begin with?
- 776
1
vote
1
answer
84
views
Are most atoms (or nuclei) unchanged since they were created?
Most atoms we experience (on this planet, for simplicity) were created very long time ago in supernova explosions and the like.
The light elements (eg helium made in the Sun) and some heavy ones (...
- 111
0
votes
2
answers
656
views
A simple explanation of the Born rule?
The probability that an initial quantum state $|\psi_i\rangle$ becomes the final quantum state $|\psi_f\rangle$ is given by
\begin{eqnarray}
P(i \rightarrow f) &=& |\langle\psi_f|\psi_i\...
- 5,925
2
votes
0
answers
76
views
What caused the first measurement to the universe?
I've been bumbling with a question recently. People postulate that with the give model of big ban, particles forms and breaks and eventually became what we saw as of today.
However, if we put ...
- 3,256
1
vote
3
answers
202
views
What is the result that that differs by many orders of magnitude between QM and GR? [duplicate]
It is well known that QM and GR are deemed incompatible due to a discrepancy in some calculations which I have read can differ by large magnitudes. What are these calculations to which people are ...
- 145
0
votes
1
answer
119
views
Are longer lives more likely in Everettian multiverse?
There are some interesting statistical thought experiments related to observers and the Anthropic Principle such as the Doomsday Argument formulated by a physicist Brandon Carter and later improved by ...
- 111
0
votes
1
answer
127
views
Do post-big-bang quantum fluctuations determine star and planet formation?
It is my understanding that cosmology simulations largely implement general-relativity, taking quantum-effects into account merely by setting the fluctuations in the initial conditions. In the real ...
- 1,171
2
votes
0
answers
662
views
Is Gerard 't Hooft's Cellular Automaton Interpretation of Quantum Mechanics background independent?
In Gerard 't Hooft in his Cellular Automata Interpretation of Quantum Mechanics
(https://www.researchgate.net/publication/...
user234845
1
vote
3
answers
394
views
Is the highest photon energy currently possible a Planck photon or based on space-time quantinization?
It makes sense that there could be an upper limit to the frequency/energy for individual photons if the universe as we know it is quantized.
But, the highest energy photons I've heard about have a ...
2
votes
0
answers
98
views
What's the difference, if any, between Soft Hair & Quantum Hair
In the early 90s, John Preskill, Sidney Coleman, Frank Wilzcek and Lawrence Krauss presented a series of papers [1][2][3] on Quantum Hair on Black Holes due to Cosmic strings in a number of ways ...
- 425
2
votes
0
answers
61
views
Would Bekenstein bound disappear in some holographic models?
In Holographic principle models there's a limit to the information that the system can store known as the "Bekenstein bound".
In physics, the Bekenstein bound is an upper limit on the entropy S, or ...
user225063
0
votes
0
answers
36
views
Could I use this informal explanation for Hawking radiation?
I need to explain Hawking radiation to my classmates for a homework. Could I use this informal explanation? (unfortunately without math). Correct me if I need to change/add something:
Quantum ...
- 21
0
votes
1
answer
572
views
How do we know what happened during the Planck epoch era of the big bang?
The Cosmic Microwave Background provides the left over radiation of the big bang. Cosmologists have theorised what happened at the Planck epoch era of the big bang.
Where is the evidence of what ...
- 107