Cosmological interpretation of JWST observations

Raikov A.; Yershov V.; Lovyagin N.

doi:doi:10.26119/VAK2024.038

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Cosmological interpretation of JWST observations

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COSMOLOGICAL INTERPRETATION OF JWST OBSERVATIONS

Section: PHYSICS OF GALAXIES AND COSMOLOGY

Proceedings: MODERN ASTRONOMY: FROM THE EARLY UNIVERSE TO EXOPLANETS AND BLACK HOLES Volume 1

UDK 52 Астрономия. Геодезия UDK 53 Физика UDK 520 Инструменты, приборы и методы астрономических наблюдений, измерений и анализа UDK 521 Теоретическая астрономия. Небесная механика. Фундаментальная астрономия. Теория динамической и позиционной астрономии UDK 523 Солнечная система UDK 524 Звезды и звездные системы. Вселенная Солнце и Солнечная система UDK 52-1 Метод изучения UDK 52-6 Излучение и связанные с ним процессы

GRNTI 41.00 АСТРОНОМИЯ GRNTI 29.35 Радиофизика. Физические основы электроники GRNTI 29.31 Оптика GRNTI 29.33 Лазерная физика GRNTI 29.27 Физика плазмы GRNTI 29.05 Физика элементарных частиц. Теория полей. Физика высоких энергий

OKSO 03.06.01 Физика и астрономия OKSO 03.05.01 Астрономия OKSO 03.04.03 Радиофизика

BBK 2 ЕСТЕСТВЕННЫЕ НАУКИ BBK 223 Физика

TBK 614 Астрономия TBK 6135 Оптика

BISAC SCI004000 Astronomy BISAC SCI005000 Physics / Astrophysics

Raikov A. ¹

Yershov V. ²

Lovyagin N. ³

Author and publication information

Authors:

1. St. Petersburg Branch of the Special Astrophysical Observatory of the Russian Academy of Sciences

2. Saint Petersburg State University of Aerospace Instrumentation

3. Department of Computer Science, St. Petersburg State University

Type:

Сonference article

DOI:

https://doi.org/10.26119/VAK2024.038

EDN:

https://elibrary.ru/xjbqls

Published:

27.12.2024

Subject area:

52
53
520
521
523
524
52-1
52-6
41.00
29.35
29.31
29.33
29.27
29.05
03.06.01
03.05.01
03.04.03
2
223
614
6135
SCI004000
SCI005000

Language:

English

Keywords:

cosmology: observations, dark ages, reionization, first stars, early universe

Abstract and keywords

Abstract (English):
Observational data from the James Webb Space Telescope (JWST) indicate a significant number of galaxies with redshifts

z > 10

. Galaxies with record-breaking redshifts exhibit luminosities comparable to those of galaxies in the local universe, and they are small in size, measuring hundreds of parsecs, as determined within the standard cosmological model,

Λ

CDM. Within this framework, a satisfactory explanation for their formation and evolution has not yet been found. So, most current research focuses on revising theories of galaxy formation and evolution to align with JWST observational data. In this talk, we discuss cosmological tests based on JWST observations, which could provide an alternative explanation. High-redshift galaxies detected by the JWST exhibit brightness and large masses, yet their sizes are over 10 times smaller than those of low-redshift galaxies with comparable masses. This leads to an increase in the gravitational potential

ϕ

and, consequently, an increase in the velocity dispersion, which in turn results in the broadening of galaxy spectral lines, including

{L y}_{α}

. Thus, their spectral lines measured by the JWST must be widened. Checking galaxy spectral line widths constitutes a new physical cosmological test, which can be conduct using the current JWST data. The high rate of star formation in those galaxies implies a high number density of ionizing photons. This leads to a significant tension with the optical depth of reionization based on the cosmic microwave background (CMB). The previously known tensions of the

Λ

CDM model (

H_{0}

σ_{8}

), along with this new inconsistency, indicate that the method of using CMB to determine cosmological parameters and the concept of Planck precision cosmology may require further evaluation.

Keywords:
cosmology: observations, dark ages, reionization, first stars, early universe

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References

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