Speaker
Description
The Galactic Center (GC) hosting a supermassive black hole, Sgr A is
surrounded by a population of S-stars. The orbit of these S-stars is
used as a probe for understanding the nature of gravity in such an
extreme environment. In dynamic interaction between stars and a
supermassive black hole, tidal interaction plays an important role in
determining the fate of the interacting system. Thus in this work, we
study in detail the tidal love number of polytopic S-stars near Sgr A.
We then used the tidal love number with a multipole expansion
l = 2 & l = 3 and estimated their corresponding pericenter shift due to
the tidal distortion effect up to a semi-major axis of 500au from the
GC. The pericenter shift is estimated for low-mass stars
(0.18 ≤ M/M⊙ ≤ 1.5) and high-mass stars (1.6 ≤ M/M⊙ ≤ 30) for
polytopic index, n = 1, 1.5, 2, 2.5, 3, 4, 4.5 and 5. We found that the
pericenter shift due to tidal distortion increases with an increase in
stellar mass and a decreasing lower polytropic index. The results
estimated are independent of general relativity and its alternative
theories. However, the above-estimated pericenter shift will
provide precise information on tests which use pericenter shift as a
probe for testing gravitational theories near Sgr A*. Several factors
that can strengthen the estimations for its application to
alternative gravitational theories have also been emphasized.
| felablues10@gmail.com | |
| Affiliation | Department of Physics, Mizoram |
