Activity Report for WG3 (Gravitational Physics), NewCompStar 2017

Activity Report for WG3 (Gravitational Physics), NewCompStar 2017. Working Group Leader: D I Jones (Southampton)

2017 was another exciting year for gravitational wave physics, bringing the first detection of gravitational waves from a binary neutron star inspiral, in August. This is reflected in the activity in the latter part of 2017.

The topic leaders appointed previously remained in place. These are Bruno Giacomazzo (Trento, Italy), with topic “numerical modelling of binary inspiral”; Tanja Hinderer (Albert Einstein Institute, Golm, Germany), with topic “Influence of EoS on gravitational wave signals from inspiral”; Andreas Bauswein (Thessaloniki, Greece), with topic “Binary inspiral electromagnetic counterparts/ejecta”; and Leonardo Gualtieri (Rome, Italy), with topic “Gravitational wave emission from individual stars”.

There were several relevant working group meetings, including three at ECT*, Trento. There were: “Bridging Nuclear and Gravitational Physics: the Dense Matter Equation of State”, 5-9 June 2017, “Nuclear Astrophysics in the Gravitational Wave Astronomy Era”, 12-16 June 2017, and “New perspectives on Neutron Star Interiors”, 9-13 October, 2017.

The 2017 NewCompStar School took place in Sofia, 11-15 September. It was dedicated to the theme “Neutron stars’ theory and observations, and gravitational waves emission.”

Gravitational issues were well represented at the annual main meeting, which in 2017 took place in Warsaw, with many talks having a dominantly gravitational theme. These included talks on continuous gravitational waves from neutron stars, gravitational waves from newly born neutron stars, models of neutron stars with in an extended theory of gravity, a status report on numerical relativity simulations of neutron stars, and general relativistic magnetohydrodynamic simulations of binary neutron star mergers.

In terms of STSMs, there were several with a strongly gravity-related theme, and many more where gravity played an important role. These included a project on gravitational waves from isolated strange stars, another on extracting information from gravitational wave data using Markov Chain Monte Carlo techniques, and another on quasinormal modes of neutron stars in massive scalar-tensor theories.

In terms of publications, there were many with a significant gravity-component that acknowledged NewCompStar. Some relevant publications include:

“Compact static stars in minimal dilatonic gravity”, Fiziev P., MPLA (2017) 32

“Binary neutron star mergers: a review of Einstein’s richest laboratory”, Baiotti, Luca, Rezzolla, Luciano, RPPh (2017) 80 6901

“Dark stars: Gravitational and electromagnetic observables”, Maselli, Andrea, Pnigouras, Pantelis, Nielsen, Niklas Grønlund, Kouvaris, Chris, Kokkotas, Kostas D., PhRvD (2017) 96 3005

“AR Scorpii and possible gravitational wave radiation from pulsar white dwarfs”, Franzon, B.; Schramm, S., MNRAS (2017) 467 4484

“Testing strong-field gravity with tidal Love numbers”, Vitor Cardoso, Edgardo Franzin, Andrea Maselli, Paolo Pani, and Guilherme Raposo, Phys. Rev. D 95, 084014 (2017)