639 citations · 1.1k across the 36 of their papers we have counts for
9 papers · 1 filter
Cancellation of one-parameter graviton gauge dependence in the effective scalar field equation in de Sitter
Dražen Glavan, Shun-Pei Miao, Tomislav Prokopec +1
We investigate gauge dependence of one-graviton-loop corrections to the effective field equation of the massless, minimally coupled scalar in de Sitter, obtained by including sourc…
On the importance of radiation-era initial conditions for tensor perturbations
Dražen Glavan, Juraj Klarić, Philipp Klose +1
Conservation of super-horizon tensor fluctuations is crucial for connecting inflation to observations. Starting from first principles, recent works have found violations of this co…
Critical reassessment of the restricted Weyl symmetry
Dražen Glavan, Ruggero Noris, Tom Zlosnik
A class of globally scale-invariant scalar-tensor theories have been proposed to be invariant under a larger class of transformations that take the form of local Weyl transformatio…
Photon propagator for inflation in the general covariant gauge
Silvije Domazet, Dražen Glavan, Tomislav Prokopec
Photon propagator for power-law inflation is considered in the general covariant gauges within the canonical quantization formalism. Photon mode functions in covariant gauges are c…
Gauge Independent Logarithms from Inflationary Gravitons
D. Glavan, S. P. Miao, T. Prokopec +1
Dependence on the graviton gauge enters the conventional effective field equations because they fail to account for quantum gravitational correlations with the source which excites…
Even the photon propagator must break de Sitter symmetry
Dražen Glavan, Tomislav Prokopec
The propagator for the massless vector field in de Sitter space cannot maintain de Sitter invariance in the general covaraint gauge, except in the exactly transverse gauge limit. T…
Photon quantization in cosmological spaces
Dražen Glavan
Canonical quantization of the photon -- a free massless vector field -- is considered in cosmological spacetimes in a two-parameter family of linear gauges that treat all the vecto…
Perturbative reduction of derivative order in EFT
Dražen Glavan
Higher derivative corrections are ubiquitous in effective field theories, which seemingly introduces new degrees of freedom at successive order. This is actually an artefact of the…
Probability distribution of the vacuum energy density
G. Duplancic, D. Glavan, H. Stefancic
As the vacuum state of a quantum field is not an eigenstate of the Hamiltonian density, the vacuum energy density can be represented as a random variable. We present an analytical…