Speaker
Description
This abstract is based on our recent papers PRD 105 (2022) 024028 and PRD 107 (2023) 044072. Recent observations of several peculiar over- and under-luminous type Ia supernovae infer indirect evidences for the violation of the Chandrasekhar mass-limit by suggesting the existence of super- and sub-Chandrasekhar limiting mass white dwarfs (WDs). In an attempt to explain these phenomena in the context of general relativistic extensions, we study them in $f(R)$ gravity. We obtain the super- and sub-Chandrasekhar limiting masses as well as the dynamical instability criteria for WDs in the given gravitational theory. In my presentation, I’ll show that the conventional stability condition $\partial M / \partial \rho_c >0 $ with $M$ being the WD’s mass and $\rho_c$ central density, is also valid in modified gravity. Moreover, I’ll discuss that the underlying gravity model plays a crucial role in determining the internal properties, such as specific heats, Debye temperature, etc. Thereby, I’ll demonstrate that a modified gravity inspired WD can have much lesser cooling age than a conventional WD.
| lupamudra2007@gmail.com | |
| Affiliation | Indian Institute of Astrophysics, Bangalore |
