Imprints of local lightcone projection effects on the galaxy bispectrum IV: Second-order vector and tensor contributions

Understand

The galaxy bispectrum on scales around and above the equality scale receives contributions from relativistic effects.

• Some of these arise from lightcone deformation effects, which come from local and line-of-sight integrated contributions.
• Here we calculate the local contributions from the generated vector and tensor background which is formed as scalar modes couple and enter the horizon.
• We show that these modes are sub-dominant when compared with other relativistic contributions.