2024年6月25日 (二) 07:11 Shen

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	* ArXiv:2406.15548		* ArXiv:2406.15548
	Given the abundance of precision cosmological data now ~~avail�able~~, modifications to the standard ΛCDM that do not conflict with		Given the abundance of precision cosmological data now available, modifications to the standard ΛCDM that do not conflict with
	observations are surprisingly difficult to realize. The “least unlikely”		observations are surprisingly difficult to realize. The “least unlikely”
	type of modification that is allowed (Knox & Millea 2020) increases		type of modification that is allowed (Knox & Millea 2020) increases
	the expansion rate of the Universe before recombination. This ~~modi�fication~~ decreases the physical sound horizon measured by the CMB,		the expansion rate of the Universe before recombination. This modification decreases the physical sound horizon measured by the CMB,
	requiring an attendant decrease in the distance to the last scattering		requiring an attendant decrease in the distance to the last scattering
	that is obtained through an increase in 𝐻0. One possible mechanism		that is obtained through an increase in 𝐻0. One possible mechanism
	for achieving this increased expansion at early times is “Early Dark		for achieving this increased expansion at early times is “Early Dark
	Energy” (EDE), where a new cosmological energy source with an		Energy” (EDE), where a new cosmological energy source with an
	equation of state similar to dark energy contributes ∼ 10% of the ~~crit�ical~~ density at its time of maximal contribution (𝑧 ∼ 3000; see Poulin		equation of state similar to dark energy contributes ∼ 10% of the critical density at its time of maximal contribution (𝑧 ∼ 3000; see Poulin
	et al. 2023 for a recent review).		et al. 2023 for a recent review).

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2024-06-25T07:11:26Z

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* ArXiv:2406.15548
Given the abundance of precision cosmological data now avail�able, modifications to the standard ΛCDM that do not conflict with
observations are surprisingly difficult to realize. The “least unlikely”
type of modification that is allowed (Knox & Millea 2020) increases
the expansion rate of the Universe before recombination. This modi�fication decreases the physical sound horizon measured by the CMB,
requiring an attendant decrease in the distance to the last scattering
that is obtained through an increase in 𝐻0. One possible mechanism
for achieving this increased expansion at early times is “Early Dark
Energy” (EDE), where a new cosmological energy source with an
equation of state similar to dark energy contributes ∼ 10% of the crit�ical density at its time of maximal contribution (𝑧 ∼ 3000; see Poulin
et al. 2023 for a recent review).

Hubble tension - 版本历史

2024年6月25日 (二) 07:11 Shen

Shen：​创建页面，内容为“* ArXiv:2406.15548 Given the abundance of precision cosmological data now avail�able, modifications to the standard ΛCDM that do not conflict with observations ar…”

Shen：创建页面，内容为“* ArXiv:2406.15548 Given the abundance of precision cosmological data now avail�able, modifications to the standard ΛCDM that do not conflict with observations ar…”