Wigner 121 Scientific Symposium

Session

Fundamental Interactions and Gravitation

Sep 19, 2023, 10:50 AM

Budapest

Conveners

Fundamental Interactions and Gravitation

• Chair: Zoltán Bajnok

18. N-Body Simulations and Cosmological Statistics.

István Szapudi (University of Hawaii)

9/19/23, 10:50 AM

I will review two recent techniques for cosmological N-body simulations. The StePS simulations use a stereographic projection to compactify the universe and fit it into a finite computer. The resulting multiresolution technique is more efficient than standard zoom-in simulations and has isotropic gravity. Complementary simulations augment an existing simulation by minimizing cosmic variance by...

19. Symmetries of spacetimes with a compact Cauchy horizon and the cosmic censor

István Rácz (Wigner RCP)

9/19/23, 11:30 AM

We outline an argument proving that any smooth vacuum spacetime containing a compact Cauchy horizon with surface gravity that can be normalized to a nonzero constant admits a Killing vector field. This proves a conjecture of Moncrief and Isenberg from 1983 under the assumption on the surface gravity and generalizes previous results due to Moncrief–Isenberg and Friedrich–Rácz–Wald, where the...

20. Inner structure of neutron stars

Péter Kovács (Wigner RCP)

9/19/23, 11:50 AM

Neutron stars (NSs) are the most massive known objects in the Universe. Their masses range from 1.2 to 2.3 solar masses, while their radii are in the range of ~10 km. The density increases towards the origin of the star, and can reach 4-6 times the normal nuclear density. The matter in these circumstances is organized by the strong interaction, and it is possible that quark-gluon plasma can be...