Positivity in the Sky
I will discuss the subtle interplay between low-energy effective descriptions relevant for our “everyday experiments” and their embeddings within an ultimate high energy completion, and how these notions are affected by gravity. I will then discuss low-energy scatterings including loops from the Standard Model in the presence of gravity and their imprints on the high energy Regge behaviour, highlighting the implications to other gauge fields and to the Weak Gravity Conjecture.