White Holes are the theoretical counterparts of Black Holes
Like a black hole, they have a singularity and an event horizon.
But instead of absorbing energy and matter, they emit them.
Mathematically, they are described by reversing time, and thus the flow of matter and energy, as compared to a black hole.
Is it mathematically equivalent to describe a WH as having a quantum singularity constructed from Exotic Matter
a theoretical form of matter with the proposed quality of “anti-mass”, and therefore produces a field of anti-gravity?
Nope, white holes (were they to exist, which to all evidence they don’t) would still have a positive mass. Gravity remains the same under time reversal.
The only thing I’ve ever heard about white holes was on a show on the History Channel, which included many scientist types, stating white holes don’t exist, and notable crackpot John Huchison claiming they did.
John Hutchison is famous for claiming to have invented the Hutchison Effect,
and demonstrating this effect with some very, veryfaked videos.
He claimed that the vents we see at the bottom of the ocean are examples of white holes since they ‘create matter from nothing’.
If Hutchison says they exist, they almost surely don’t.