3.4k citations
- National Institute for Subatomic PhysicsNL871 papers
- Centre National de la Recherche ScientifiqueFR771 papers
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6 papers · 2 filters
Global monopoles can change Universe's topology
Anja Marunovic, Tomislav Prokopec
If the Universe undergoes a phase transition, at which global monopoles are created or destroyed, topology of its spatial sections can change. More specifically, by making use of M…
Local Conformal Symmetry: the Missing Symmetry Component for Space and Time
Gerard T. Hooft
Local conformal symmetry is usually considered to be an approximate symmetry of nature, which is explicitly and badly broken. Arguments are brought forward here why it has to be tu…
Late-time backreaction from inflationary fluctuations of a non-minimally coupled massless scalar
D. Glavan, T. Prokopec, D. van der Woude
We consider the late time one-loop quantum backreaction from inflationary fluctuations of a non-minimally coupled, massless scalar field. The scalar is assumed to be a spectator fi…
Observing Shape in Spacetime
Sean Gryb
The notion of "reference frame" is a central theoretical construct for interpreting the physical implications of spacetime diffeomorphism invariance in General Relativity. However,…
Representing the Graviton Self-Energy on de Sitter Background
Katie E. Leonard, Sohyun Park, Tomislav Prokopec +1
We derive a noncovariant but simple representation for the self-energy of a conformally transformed graviton field on the cosmological patch of de Sitter. Our representation involv…
A photon propagator on de Sitter in covariant gauges
Silvije Domazet, Tomislav Prokopec
We construct a de Sitter invariant photon propagator in general covariant gauges. Our result is a natural generalization of the Allen-Jacobson photon propagator in Feynman gauge. O…