Disks, tori, spheres. Accretion onto compact objects

22 Jun 2023, 10:00 → 27 Jun 2023, 23:25 Europe/Prague

R2 (Opava)

Wlodek Kluzniak, Martin Urbanec, Gabriel Török (Silesian University in Opava)

This meeting will delve into the intricate dynamics and astrophysical phenomena associated with accretion onto compact objects such as naked singularities, black holes, neutron stars, and white dwarfs. Experts from various disciplines will share their insights on the formation, structure, and observational signatures of these compact objects and accretion disks, tori, and spheres, unraveling the mysteries of these captivating cosmic entities. 

Instructions for Speakers.pdf

Thursday, 22 June

10:00 Morning coffee

1 Welcome

Speaker: Wlodek Kluzniak

2 Conservative upper limit to the electric charge of Sgr A*

Speaker: Ruchi Mishra

3 The puffy accretion disk

Speaker: Debora Lančová (Institute of Physics, Silesian University in Opava)

13:15 Seminar of the Institute of Physics

4 GRMHD Simulations of multiple accretion tori structures around black holes

Speaker: Dilshodbek Bardiev

15:45 Coffee Break

5 Could a Buchdahl star be a Virial star?

Speaker: Naresh Dadhich

6 Resolution study of disk accretion in Koral

Speaker: Angelos Karakonstantakis (Nicolaus Copernicus Astronomical Center)

Friday, 23 June

10:00 Morning Coffee

7 Hydrodynamical obstruction of acceleration of tunnelling bubble wall

Speaker: Tomasz Krajewski

8 Influence of superconductivity on the mass of hybrid neutron stars

Speaker: Simon Liebing

9 Detection Prospects for Gravitational Waves from Binary Neutron Star Merger Remnants

Speaker: Nick Stergioulas

10 Penrose process and its applications

Speaker: Zdeněk Stuchlík

16:00 Coffee Break

11 Electromagnetic environment of Galactic center: flares, charge, and spin orientation

Speaker: Arman Tursunov (Silesian University in Opava)

Saturday, 24 June

12 Modeling the Iron K-alpha line emission in a NS LMXB

Speaker: René Šprňa

13 Density functional approach to neutron star astrophysics

Speaker: David Blaschke

14 Radio emission from aurorae on pulsar planets

Speaker: Miljenko Cemeljic (NCAC, ASIAA & SHAO)

18:00 Dinner

Sunday, 25 June

15 Modeling the Iron K-alpha line emission in a NS LMXB - part 2 + Open Discussion

Speaker: René Šprňa

16 Density functional approach to neutron star astrophysics - part 2 + Open discussion

Speaker: David Blaschke

17 Radio emission from aurorae on pulsar planets - part 2 + Open discussion

Speaker: Miljenko Cemeljic (NCAC, ASIAA & SHAO)

15:00 Trip to museum

Monday, 26 June

10:00 Morning coffee

18 ULXs as accreting neutron stars: the effect of magnetic field strength in GRRMHD simulations

Speaker: Fatemeh Kayanikhoo (CAMK)

19 Introduction to BH thermodynamics and chemistry

Speaker: Martin Blaschke (Institute of Physics, SLU)

20 The Influence of photon orbits on shadow creation by naked singularities

Speaker: Saken Toktarbay (Al-Farabi Kazakh National university)

21 Cloaked singularities

Speaker: Wlodek Kluzniak

22 On the maximum mass of differentially rotating neutron stars

Speaker: Dorota Rosińska

15:50 Coffee Break

23 A secondary black-hole colliding with an accretion disc near SMBH

Speaker: Vladimír Karas

Tuesday, 27 June

10:00 Morning coffee

24 The Lensing Simulation Device code

Speaker: Kateřina Klimovičová (Silesian University in Opava)

25 Probing dense matter in rapidly variable X-ray sources

Speaker: Gabriel Török (Silesian University in Opava)

26 Measuring mass and radius of neutron star using kHz QPOs

Speaker: Martin Urbanec

27 Czech contribution to eXTP science

Speaker: Vladimír Karas

12:30 Conference lunch

28 Trapped regions and neutrino emission in ultra-compact stars

Speaker: Jaroslav Vrba

29 Misalignment of the Lense-Thirring precession by an accretion torque

Speaker: Jiri Horak (Astronomical Institute ASCR, Prague)

15:45 Closing Coffee Break