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Релятивистик астрофизика ва гравитация
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2021 йил 12-14 май кунлари Тошкент шаҳрида ЎзР ФА Астрономия институти ҳамдп ЎзР ФА Ядро физикаси институти ҳамкорлигида «Релятивистик астрофизика ва гравитация» мавзусида, онлайн форматида халқаро миқёсидаги илмий семинар (IWRAG-2021) ўтказилиши режалаштирилмоқда.

Семинардан кўзланган мақсад – умумий нисбийлик назарияси ва релятивистик астрофизика соҳасига ихтисослашган минтақавий (Марказий Осиё) астрофизикларни ҳамда халқаро илмий ҳамжамиятни бирлаштириш, шинингдек эришилган натижаларни узаро алмашиб, халқаро институтлар билан алоқаларни кенгайтириш имконини бериш. IWRAG-2021 Тошкнтда, Ўзбекистонда мунтазам ташкиллаштирилиши режалаштирилаётган биринчи семинарлар серияси бўлиши, шунингдек талабалар ва шу соҳага ихтисослашган олимлар учун ажойиб имкониятлар тақдим этиши кутилмоқда. Семинар доирасида релятивистик астрофизика соҳасидаги халқаро тадқиқотлар, Ўзбекистон Республикаси астрономия ва ядро физикаси институтида давлат илмий – техника дастурлари доирасида олиб борилаётган фундаментал тадқиқотлар натижалари ҳақида маърузалар ўқилади.
Конференция дастури
SOC/LOC
International Advisory Committee

Bobomurat Ahmedov (AI, Uzbekistan)

Daniele Malafarina (Nazarbayev University, Kazakhstan)

Ernazar Abdikamalov (Nazarbayev University, Kazakhstan)

Medeu Abishev (Al-Farabi University, Kazakhstan)

Ashfaque Bokhari (King Fahd University of Petroleum & Minerals, Saudi Arabia)

Ugur Camci (Roger Williams University, USA)

Naresh Dadhich (IUCAA, India)

Viktoriya Morozova (PennState, USA)

Luciano Rezzolla (Frankfurt, University, Germany)

Sushant Ghosh (Centre for Theoretical Physics, India)

Jutta Kunz (Oldenburg University, Germany)

Ahmadjon Abdujabbarov (AI, Uzbekistan)

Bobir Tosmatov (AI, Uzbekistan)

Farrukh Fattoyev (NY University, USA)

Cosimo Bambi (Fudan University, China)

Wenbiao Han (ShAO, China)

Zdenek Stuchlik (Opava, Czech Republic)

Martin Kolos (Opava, Czech Republic)

Asqar Qadir (Islamabad, Pakistan)

Francesco de Paolis (Lecce, Italy)

Mariafelicia De Laurentis (Napoli, Italy)

Muhammad Sharif (Punjab University, Pakistan)

Mubasher Jamil (China)

Local Organizing Committee

Ahmedov Bobomurat, Chairman

Abdujabbarov Ahmadjon

Toshmatov Bobir

Tursunov Arman

Abdikamalov Askar

Tojiev Sardor

Shaymatov Sanjar

Atamurotov Farruh

Mardonov Shuhrat

Rayimbaev Djavlanbek

Boboqambarova Madina

Rahimov Ozodbek

Рўйхатдан ўтган қатнашчилар (9)
Турсынбек Ерназаров
Мамлакат: Казахстан | Тақдимот тури: Poster
Тақдимот номи: «слушатель»
Ташкилот: «КазНУ имени аль-Фараби»
Қисқача маълумот (абстракт) ... слушатель
Mubasher Jamil
Мамлакат: China | Тақдимот тури: Plenary talk
Тақдимот номи: «NA»
Ташкилот: «Zhejiang University of Technology»
Қисқача маълумот (абстракт) ... NA
Bobomurat Ahmedov
Мамлакат: Uzbekistan | Тақдимот тури: Plenary talk
Тақдимот номи: «Development and Perspectives of Relativistic Astrophysics in Uzbekistan»
Ташкилот: «Ulugh Beg Astronomical Institute»
Қисқача маълумот (абстракт) ... I will discuss successful development and establishment of scientific group specialized in general relativity and relativistic astrophysics in Uzbekistan. Summary of scientific results performed on the study in Uzbekistan in relativistic astrophysics of compact gravitational objects will be provided.
Viktoriya Giryanskaya
Мамлакат: USA | Тақдимот тури: Contributed talk
Тақдимот номи: «The gravitational wave signal from core-collapse supernovae»
Ташкилот: «Pennsylvania State University»
Қисқача маълумот (абстракт) ... We study gravitational waves (GWs) from a set of two- and three-dimensional multi-group neutrino radiation hydrodynamic simulations of core-collapse supernovae (CCSNe). Our goal is to systematize the current knowledge about the post-bounce CCSN GW signal and recognize the templatable features that could be used by the ground-based laser interferometers. We demonstrate that starting from ~400ms after core bounce the dominant GW signal represents the fundamental quadrupole (l=2) oscillation mode (f-mode) of the proto-neutron star (PNS), which can be accurately reproduced by a linear perturbation analysis of the angle-averaged PNS profile. Before that, in the time interval between ~200 and ~400ms after bounce, the dominant mode has two radial nodes and represents a g-mode. We associate the high-frequency noise in the GW spectrograms above the main signal with p-modes, while below the dominant frequency there is an `excluded region' with very little power. Weak dependence of the dominant GW frequency on the progenitor mass motivates us to provide a simple fit for it as a function of time, which can be used as a prior when looking for CCSN candidates in the LIGO data.
Ernazar Abdikamalov
Мамлакат: Kazakhstan | Тақдимот тури: Plenary talk
Тақдимот номи: «Explosions of massive stars»
Ташкилот: «Nazarbayev University»
Қисқача маълумот (абстракт) ... Core-collapse supernovae are the powerful explosions of massive stars that happen at the end of their lives. They play an important role in the evolution of the universe, enriching galaxies with heavy elements and giving birth to neutron stars and, in some cases, black holes. Despite their importance, the exact details of how they explode remain uncertain. In this talk, I will review our current understanding of the explosion mechanism with a particular emphasis on the role of multi-dimensional hydrodynamic instabilities.
DR. RABIA SALEEM
Мамлакат: Pakistan | Тақдимот тури: Contributed talk
Тақдимот номи: «Study of Interacting Dark Sectors using Chevallier-Polarsky-Linder Type Parametrization»
Ташкилот: «COMSATS University Islamabad, Lahore Campus»
Қисқача маълумот (абстракт) ... The main focus of this paper is to investigate an interacting phenomena between dark matter-dark energy within a non-flat FLRW spacetime geometry bounded by a horizon with specific cut-off. We assume an interaction term $Q(z)$ between two dark components of the fluid and evaluate it analytically via physical quantities like energy density and pressure. We constraint the model parameters and found specific region of validity for these parameters. Considering ``Chevallier-Polarsky-Linder type parametrization" of the coincidence parameter $r(z)$, we observed that our model possess a future singularity of Type III. After finding the singular behavior, we examine the nature of our model via cosmological parameters like $q,~r,~s$. It is noted that our model is very close to $\Lambda$ cold dark matter model.
Zoha Tariq
Мамлакат: Pakistan | Тақдимот тури: Plenary talk
Тақдимот номи: «Effects of electromagnetic field on the structure of massive compact objects»
Ташкилот: «University of the Punjab»
Қисқача маълумот (абстракт) ... This paper encompasses a set of stellar equations that administer the formation and evolution of self-gravitating, dissipative spherically symmetric fluid distributions having anisotropic stresses in the presence of electromagnetic field. The Riemann tensor is split orthogonally to procure five scalar functions named as structure scalars which are then utilized in the stellar equations. It is shown that some basic fluid properties such as energy density inhomogeneity, pressure anisotropy and heat flux are interlinked with the obtained scalars. Further, it is shown that all the solutions to Einstein equations can be written in terms of these five scalars keeping in view the static case.
Zoha Tariq
Мамлакат: Pakistan | Тақдимот тури: Plenary talk
Тақдимот номи: «Effects of electromagnetic field on the structure of massive compact objects»
Ташкилот: «University of the Punjab»
Қисқача маълумот (абстракт) ... This paper encompasses a set of stellar equations that administer the formation and evolution of self-gravitating, dissipative spherically symmetric fluid distributions having anisotropic stresses in the presence of electromagnetic field. The Riemann tensor is split orthogonally to procure five scalar functions named as structure scalars which are then utilized in the stellar equations. It is shown that some basic fluid properties such as energy density inhomogeneity, pressure anisotropy and heat flux are interlinked with the obtained scalars. Further, it is shown that all the solutions to Einstein equations can be written in terms of these five scalars keeping in view the static case.
Muhammad Zaeem Ul Haq Bhatti
Мамлакат: Pakistan | Тақдимот тури: Contributed talk
Тақдимот номи: «Dynamical Analysis of Self-gravitating Objects in Modified Gravity»
Ташкилот: «University of the Punjab»
Қисқача маълумот (абстракт) ... TBA
Улуғбек номидаги Астрономия институти,