| Name: Ayan Kumar Naskar |
| Affiliation: Jadavpur University |
| Conference ID: ASI2026_101 |
| Title: Correction in light bending angle due to finite size effects in the worldline formalism. |
| Abstract Type: Poster |
| Abstract Category: High Energy Phenomena, Fundamental Physics and Astronomy |
| Author(s) and Co-Author(s) with Affiliation: Ayan Kumar Naskar(Jadavpur University, Kolkata, West Bengal 700032, India), Sourav Bhattacharya(Jadavpur University, Kolkata, West Bengal 700032, India) |
| Abstract: The phenomenon of light bending due to a massive body has been studied rigorously at both classical and quantum levels. The quantum corrections up to 2PN order including spin effects has previously been calculated. In this work we calculate the leading order correction in light bending due to finite size of a massive object. In the worldline formalism the finite size effect is introduced through the Weyl tensor. The magnetic part of Weyl tensor couples to the odd spin vectors and the electric part couples to the even spin vectors. This structure of finite size effective action has been established previously. Here, we calculate the corrections in the bending angle for a massless scalar (spin-0) probe due to the octupole and hexadecapole vertices, and they turn out to be of the order of 1/b4 and 1/b5, where b denotes the impact parameter. This agrees with the predictions from the corresponding well established potentials. Further extension of this work is under progress where we are trying to calculate the effect of including the quantum spin of the probe (spin ½ and spin 1). To the best of our knowledge, this is a significant step towards understanding the quantum correction in light bending phenomenon. |
