Space & Astronomy

Quantum Cosmology and Cosmic Horizons: 2026

Nine advanced questions examining quantum origins, dark energy parametrizations, and the observational limits of cosmology.

#cosmology#universe#quantum gravity#cosmic microwave background#inflation#dark energy#multiverse#general relativity#cosmological constant

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Total Questions

Difficulty Level

hard

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0/0

Quiz Questions

Answer all questions below and test your knowledge.

1
In the context of the trans-Planckian problem for cosmological inflation, what is the core issue regarding the origin of primordial fluctuations?
Question 1
2
The 'Hubble tension' between early-universe (Planck CMB) and late-universe (SH0ES) measurements of H0 persists as of 2026. Which proposed solution, if correct, would most directly alter the sound horizon at recombination?
Question 2
3
In quantum cosmology, the Hartle-Hawking 'no-boundary' wave function of the universe proposes a specific initial condition. What does it primarily select?
Question 3
4
The phenomenological w0–wa parametrization for dark energy (w(a) = w0 + wa(1-a)) is used to probe dynamics. What specific feature of cosmic expansion would a measured wa > 0 most directly imply about dark energy's recent evolution?
Question 4
5
What is the primary theoretical motivation for the 'swampland conjectures' in string theory cosmology, and what key constraint do they place on a simple single-field slow-roll inflationary model?
Question 5
6
In measuring B-mode polarization of the Cosmic Microwave Background, what specific systematic effect is most notoriously difficult to distinguish from a primordial gravitational wave signal (tensor-to-scalar ratio r)?
Question 6
7
The 'cosmological collider' physics is a theoretical program searching for specific signatures in primordial non-Gaussianity. What unique feature would such signals reveal about the very high-energy physics during inflation?
Question 7
8
What is the fundamental reason, based on general relativity and the cosmological principle, that we cannot receive light signals from galaxies beyond our cosmic event horizon?
Question 8
9
Considering the ΛCDM model's ultimate fate, what is the predicted asymptotic state of the universe's large-scale structure given a constant positive cosmological constant?
Question 9

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Quantum Cosmology and Cosmic Horizons: 2026

Quiz Intelligence

Quiz Questions

In the context of the trans-Planckian problem for cosmological inflation, what is the core issue regarding the origin of primordial fluctuations?

The 'Hubble tension' between early-universe (Planck CMB) and late-universe (SH0ES) measurements of H0 persists as of 2026. Which proposed solution, if correct, would most directly alter the sound horizon at recombination?

In quantum cosmology, the Hartle-Hawking 'no-boundary' wave function of the universe proposes a specific initial condition. What does it primarily select?

The phenomenological w0–wa parametrization for dark energy (w(a) = w0 + wa(1-a)) is used to probe dynamics. What specific feature of cosmic expansion would a measured wa > 0 most directly imply about dark energy's recent evolution?

What is the primary theoretical motivation for the 'swampland conjectures' in string theory cosmology, and what key constraint do they place on a simple single-field slow-roll inflationary model?

In measuring B-mode polarization of the Cosmic Microwave Background, what specific systematic effect is most notoriously difficult to distinguish from a primordial gravitational wave signal (tensor-to-scalar ratio r)?

The 'cosmological collider' physics is a theoretical program searching for specific signatures in primordial non-Gaussianity. What unique feature would such signals reveal about the very high-energy physics during inflation?

What is the fundamental reason, based on general relativity and the cosmological principle, that we cannot receive light signals from galaxies beyond our cosmic event horizon?

Considering the ΛCDM model's ultimate fate, what is the predicted asymptotic state of the universe's large-scale structure given a constant positive cosmological constant?

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