Dynamical descalarization with a jump during a black hole merger

GRFolres: A code for modified gravity simulations in strong gravity

“…A neutron star background was considered in (Kuan et al, 2023) with a modification of SACRA-MPI code (Kiuchi et al, 2017;Yamamoto et al, 2008). Whilst order-reduced methods like those in (Doneva et al, 2022;Elley et al, 2022;Evstafyeva et al, 2023;Okounkova et al, 2019Okounkova et al, , 2020Okounkova et al, , 2023Okounkova, 2020;R. et al, 2023;Richards et al, 2023;Silva et al, 2021;Witek et al, 2019) provide an estimate of the scalar dynamics and associated energy losses, they may miss information about the fully non-linear impact on the metric and suffer from the accumulation of secular errors over long inspirals.…”

“…In spherical symmetry several codes have been developed that implement Einstein-scalar-Gauss-Bonnet (a subset of the 4𝜕ST theory that we include as an example in GRFolres). In particular, using the NRPy framework (http://astro.phys.wvu.edu/bhathome) (Ruchlin et al, 2018) in (Doneva et al, 2022), and the private code of Ripley & Pretorius in (R et al, 2023;Ripley & Pretorius, 2019a, 2019b, and a modification of the GR1D code (Gerosa et al, 2016;O'Connor & Ott, 2010). There is also the fully nonlinear spherical code developed in (Corelli et al, 2023b(Corelli et al, , 2023a.…”

Dynamic generation or removal of a scalar hair

“…In particular, many intriguing results are not straightforward from the viewpoint of the linear stability analysis. In this context, the nonlinear dynamics plays an essential role for gaining a deeper insight into the black hole scalarization and its reverse process, the so-called descalarization [61][62][63].…”

Tachyonic instability and spontaneous scalarization in parameterized Schwarzschild-like black holes

“…Subsequently, within the framework of Einstein-scalar-Gauss-Bonnet gravity, it was revealed by researchers that this a e-mail: xuhengyu0501@outlook.com b e-mail: niannian_12138@163.com c e-mail: sjzhang@zjut.edu.cn (corresponding author) unique phenomenon also takes place in Schwarzschild black holes [2][3][4]. Building upon these seminal studies, researchers have undertaken extensive explorations in this area, extending the work to Kerr black holes [5][6][7], various other spontaneous scalarization models [8][9][10][11][12][13][14] and binary systems [15][16][17][18][19][20][21]. For more details, refer to a recent review [22] and the references therein.…”