Naslov
Antiscreening in perturbative quantum gravity and resolving the Newtonian singularity

Autori
Marunović, Anja ; Prokopec, Tomislav

Izvornik
Physical Review D - Particles, Fields, Gravitation, and Cosmology (1550-7998) 87 (2013); 104027-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
antiscreening; perturbative gravity; Newtonian singularity; Schwinger-Keldysh formalism

Sažetak
We calculate the quantum corrections to the Newtonian potential induced by a massless, nonminimally coupled scalar field on Minkowski background. We make use of the graviton vacuum polarization calculated in our previous work and solve the equation of motion nonperturbatively. When written as the quantum-corrected gauge invariant Bardeen potentials, our results show that quantum effects generically antiscreen the Newtonian singularity 1/r. This result supports the point of view that gravity on (super-)Planckian scales is an asymptotically safe theory. In addition, we show that, in the presence of quantum fluctuations of a massless, (non)minimally coupled scalar field, dynamical gravitons propagate superluminally. The effect is, however, unobservably small and it is hence of academic interest only.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA