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Phone: +998 71 2358102
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Relativistic astrophysics and Gravitation
To register for the conference, follow the link ...
Conference files - program, list of participants, photos ...
Contacts: asmik96@astrin.uz

On May 12-14, 2021, International Online Workshop on Relativistic Astrophysics and Gravitation, IWRAG-2021 is planned to be held in Tashkent together with the Institute of Astronomy of the Academy of Sciences of the Republic of Uzbekistan and the Institute of Nuclear Physics of the Academy of Sciences of the Republic of Uzbekistan.

The purpose of the meeting is to bring up the regional (Central Asian) astrophysicists specialized in general relativity & relativistic astrophysics and the international scientific community together and give an opportunity to exchange the results between them in order to expand contacts and the relations with the international institutions. It is expected that IWRAG-2021 is the first time organized as a series of the regular workshops in Tashkent, Uzbekistan which would have a great opportunity for students and local scientists specialized in relativistic astrophysics and general relativity. The seminar will include lectures on international research in the field of relativistic astrophysics, the results of fundamental research conducted within the framework of state scientific and technical programs at the Institute of Astronomy and Nuclear Physics of the Republic of Uzbekistan.
Conference program
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
List of сonfirmed participants (9)
Турсынбек Ерназаров
Country: Казахстан | Presentation type: Poster
Presentation title: «слушатель»
Organization: «КазНУ имени аль-Фараби»
Abstract ... слушатель
Mubasher Jamil
Country: China | Presentation type: Plenary talk
Presentation title: «NA»
Organization: «Zhejiang University of Technology»
Abstract ... NA
Bobomurat Ahmedov
Country: Uzbekistan | Presentation type: Plenary talk
Presentation title: «Development and Perspectives of Relativistic Astrophysics in Uzbekistan»
Organization: «Ulugh Beg Astronomical Institute»
Abstract ... 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
Country: USA | Presentation type: Contributed talk
Presentation title: «The gravitational wave signal from core-collapse supernovae»
Organization: «Pennsylvania State University»
Abstract ... 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
Country: Kazakhstan | Presentation type: Plenary talk
Presentation title: «Explosions of massive stars»
Organization: «Nazarbayev University»
Abstract ... 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
Country: Pakistan | Presentation type: Contributed talk
Presentation title: «Study of Interacting Dark Sectors using Chevallier-Polarsky-Linder Type Parametrization»
Organization: «COMSATS University Islamabad, Lahore Campus»
Abstract ... 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
Country: Pakistan | Presentation type: Plenary talk
Presentation title: «Effects of electromagnetic field on the structure of massive compact objects»
Organization: «University of the Punjab»
Abstract ... 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
Country: Pakistan | Presentation type: Plenary talk
Presentation title: «Effects of electromagnetic field on the structure of massive compact objects»
Organization: «University of the Punjab»
Abstract ... 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
Country: Pakistan | Presentation type: Contributed talk
Presentation title: «Dynamical Analysis of Self-gravitating Objects in Modified Gravity»
Organization: «University of the Punjab»
Abstract ... TBA
Ulugh Beg Astronomical Institute,