COSMOLOGICAL INTERPRETATION OF JWST OBSERVATIONS
Авторы:
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
Тип:
Статья конференции
Опубликовано:
27.12.2024
Классификаторы:
УДК 52 Астрономия. Геодезия
УДК 53 Физика
УДК 520 Инструменты, приборы и методы астрономических наблюдений, измерений и анализа
УДК 521 Теоретическая астрономия. Небесная механика. Фундаментальная астрономия. Теория динамической и позиционной астрономии
УДК 523 Солнечная система
УДК 524 Звезды и звездные системы. Вселенная Солнце и Солнечная система
УДК 52-1 Метод изучения
УДК 52-6 Излучение и связанные с ним процессы
ГРНТИ 41.00 АСТРОНОМИЯ
ГРНТИ 29.35 Радиофизика. Физические основы электроники
ГРНТИ 29.31 Оптика
ГРНТИ 29.33 Лазерная физика
ГРНТИ 29.27 Физика плазмы
ГРНТИ 29.05 Физика элементарных частиц. Теория полей. Физика высоких энергий
ОКСО 03.06.01 Физика и астрономия
ОКСО 03.05.01 Астрономия
ОКСО 03.04.03 Радиофизика
ББК 2 ЕСТЕСТВЕННЫЕ НАУКИ
ББК 223 Физика
ТБК 614 Астрономия
ТБК 6135 Оптика
BISAC SCI004000 Astronomy
BISAC SCI005000 Physics / Astrophysics
УДК 53 Физика
УДК 520 Инструменты, приборы и методы астрономических наблюдений, измерений и анализа
УДК 521 Теоретическая астрономия. Небесная механика. Фундаментальная астрономия. Теория динамической и позиционной астрономии
УДК 523 Солнечная система
УДК 524 Звезды и звездные системы. Вселенная Солнце и Солнечная система
УДК 52-1 Метод изучения
УДК 52-6 Излучение и связанные с ним процессы
ГРНТИ 41.00 АСТРОНОМИЯ
ГРНТИ 29.35 Радиофизика. Физические основы электроники
ГРНТИ 29.31 Оптика
ГРНТИ 29.33 Лазерная физика
ГРНТИ 29.27 Физика плазмы
ГРНТИ 29.05 Физика элементарных частиц. Теория полей. Физика высоких энергий
ОКСО 03.06.01 Физика и астрономия
ОКСО 03.05.01 Астрономия
ОКСО 03.04.03 Радиофизика
ББК 2 ЕСТЕСТВЕННЫЕ НАУКИ
ББК 223 Физика
ТБК 614 Астрономия
ТБК 6135 Оптика
BISAC SCI004000 Astronomy
BISAC SCI005000 Physics / Astrophysics
Язык материала:
английский
Ключевые слова:
cosmology: observations, dark ages, reionization, first stars, early universe
Аннотация (русский):
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, $\Lambda$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 $\phi$ and, consequently, an increase in the velocity dispersion, which in turn results in the broadening of galaxy spectral lines, including ${\rm Ly}_\alpha$. 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 $\Lambda$CDM model ($H_0$, $\sigma_8$), 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.
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, $\Lambda$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 $\phi$ and, consequently, an increase in the velocity dispersion, which in turn results in the broadening of galaxy spectral lines, including ${\rm Ly}_\alpha$. 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 $\Lambda$CDM model ($H_0$, $\sigma_8$), 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.
Ключевые слова:
cosmology: observations, dark ages, reionization, first stars, early universe
cosmology: observations, dark ages, reionization, first stars, early universe
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