Packing extra mass in compact stellar structures: An interplay between Kalb-Ramond field and extra dimensions

Understand

We have derived the Buchdahl's limit for a relativistic star in presence of the Kalb-Ramond field in four as well as in higher dimensions.

• It turns out that the Buchdahl's limit gets severely affected by the inclusion of the Kalb-Ramond field.
• In particular, the Kalb-Ramond field in four spacetime dimensions enables one to pack extra mass in any compact stellar structure of a given radius.
• On the other hand, a completely opposite picture emerges if the Kalb-Ramond field exists in higher dimensions, where the mass content of a compact star is smaller compared to that in general relativity.