Дослiдження космологiчних наслiдкiв та доцiльностi змiни G та Λ залежно від параметру уповiльнення

  • Асем Джотiн Мейтей Кафедра математики, коледж Правабатi, Маянг Iмфал, Манiпур, Iндiя https://orcid.org/0000-0003-3384-5264
  • Салам Кiранмала Чану Кафедра математики, Д.М. коледж мистецтв, Манiпур, Iндiя; Кафедра математики, Унiверситет Дханаманджурi, Манiпур, Iндiя https://orcid.org/0000-0001-9014-3811
  • Хуейдром Опен Сiнгх Кафедра математики, Унiверситет Дханаманджурi, Манiпур, Iндiя https://orcid.org/0009-0001-8451-9533
  • Кангуджам Прiйокумар Сiнгх Кафедра математики, Унiверситет Манiпура, Канчiпур, Манiпур, Iндiя https://orcid.org/0000-0002-8784-4091
Ключові слова: анiзотропна, змiнна гравiтацiйна константа, темна енергiя, космiчне прискорення

Анотація

Ми коротко розглядаємо просторово однорiдну та анiзотропну космологiчну модель Бiанкi I типу зi змiнною гравiтацiйною сталою G(t) та космологiчним членом Λ(t). Рiвняння поля Ейнштейна розв’язуються з урахуванням залежного вiд часу параметра уповiльнення (DP) та баротропного рiвняння стану (EoS) p=Wρ. . Модельний всесвiт узгоджується з масштабним коефiцiєнтом виду ɑ(t) = (ect - 1)1/ζc, який забезпечує плавну еволюцiю вiд уповiльнюючої до прискорюючої фази космiчного розширення. Отримано аналiтичнi вирази для тиску, густини енергiї, G(t) та Λ(t), а також проаналiзовано їх змiни з
червоним змiщенням. Дослiджено поведiнку космологiчних параметрiв, таких як функцiя Хаббла H(z), параметр уповiльнення q(z), параметр ривка J(z) та дiагностика Om(z). Отримано поточнi значення H0 = 67.112+0.049-0.11 km s-1Mpc-1, q0 = -0.2926 та перехiдне червоне змiщення zt = 0.8626, що узгоджується з нещодавнiми спостереженнями. Загалом, запропонована модель змiнної G та Λ типу Б’янкi-I забезпечує узгоджений опис переходу Всесвiту вiд уповiльнення до прискорення, що узгоджується з 46 OHD.

Завантаження

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Посилання

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Опубліковано
2026-03-14
Цитовано
Як цитувати
Мейтей, А. Д., Чану, С. К., СiнгхХ. О., & СiнгхК. П. (2026). Дослiдження космологiчних наслiдкiв та доцiльностi змiни G та Λ залежно від параметру уповiльнення. Східно-європейський фізичний журнал, (1), 14-28. https://doi.org/10.26565/2312-4334-2026-1-02