Speaker
Description
One of the macroscopically measurable effects of gravity is the tidal deformability of astrophysical objects, which can be quantified by their tidal Love numbers. For planets and stars, these numbers measure the resistance of their material against the tidal forces, and the resulting contribution to their gravitational multipole moments. According to GR, nonrotating deformed BHs, instead, show no addition to their gravitational multipole moments, and all of their Love numbers are zero. Here I will discuss different configurations of nonrotating compact and ultracompact objects to bridge the compactness gap between BHs an NSs and calculate their Love number. For the first time we compute the Love number for uniform density ultracompact stars with compactness beyond the Buchdahl limit, and we find that the Love number approaches smoothly to zero as the compactness approaches the Schwarzschild limit. Our results provide insight on the zero tidal deformability limit.