Question

what are exotic matter?

Answer 1

Any kind of non-baryonic matter that is not made of baryons, the subatomic particles, such as protons and neutrons, of which ordinary matteris composed is known as Exotic matter.

Answer 2

Hello!!

EXOTIC MATTER ::

EXOTIC MATTER IS ANYTHING WITH STRESS
ENERGY TENSOR THAT VIOLATES THE ENERGY CONDITION!!

These are some energy condition::

1. Null Energy Condition (NEC)
2. Weak Energy Condition (WEC)
3. Strong Energy Condition (SEC)
4.Dominant Energy Condition (DEC)

In simple words

EXOTIC MATTER IS JUST NAME FOR MATTER
THAT IS EITHER HYPOTHETICAL OR EXTREMELY RARE AND NOT FULLY UNDERSTAND!!

hope it helps