Publications (33)
Breaking of scaling symmetry by massless scalar on de Sitter
D. Glavan, S. P. Miao, T. Prokopec +1
We study the response of a classical massless minimally coupled scalar to a static point scalar charge on de Sitter. By considering explicit solutions of the problem we conclude th…
The Graviton Tail almost Completely Wags the Dog
S. P. Miao, T. Prokopec, R. P. Woodard
One graviton loop corrections to the vacuum polarization on de Sitter show two interesting infrared effects: a secular enhancement of the photon electric field strength and a long…
Fluctuating Dark Energy and the Luminosity Distance
C. J. G. Vedder, E. Belgacem, N. E. Chisari +1
The origin of dark energy driving the accelerated expansion of the universe is still mysterious. We explore the possibility that dark energy fluctuates, resulting in spatial correl…
Explaining Large Electromagnetic Logarithms from Loops of Inflationary Gravitons
D. Glavan, S. P. Miao, T. Prokopec +1
Recent progress on nonlinear sigma models on de Sitter background has permitted the resummation of large inflationary logarithms by combining a variant of Starobinsky's stochastic…
Natural Magnetogenesis from Inflation
K. Dimopoulos, T. Prokopec, O. Tornkvist +1
We consider the gravitational generation of the massive Z-boson field of the standard model, due to the natural breaking of its conformal invariance during inflation. The electrowe…
Baryogenesis from `electrogenesis' in a scalar field dominated epoch
M. Joyce, T. Prokopec
Scalar fields can play a dominant role in the dynamics of the Universe until shortly before nucleosynthesis. Examples are provided by domination by a kinetic mode of a scalar field…
The Hubble Effective Potential
T. M. Janssen, S. P. Miao, T. Prokopec +1
We generalize the effective potential to scalar field configurations which are proportional to the Hubble parameter of a homogeneous and isotropic background geometry. This may be…
Entropy of a Classical Stochastic Field and Cosmological Perturbation
R. Brandenberger, V. Mukhanov, T. Prokopec
We propose a general definition of nonequilibrium entropy of a classical stochastic field. As an example of particular interest in cosmology we apply this definition to compute the…
Inflation as a spontaneous symmetry breaking of Weyl symmetry
A. Barnaveli, S. Lucat, T. Prokopec
In this paper we study a novel realization of inflation, based on Weyl invariant gravity with torsion. We show that requiring the classical action for the scalar field to be Weyl i…
Prospects for Fundamental Physics with LISA
Enrico Barausse, Emanuele Berti, Thomas Hertog +318
In this paper, which is of programmatic rather than quantitative nature, we aim to further delineate and sharpen the future potential of the LISA mission in the area of fundamental…
Deducing Cosmological Observables from the S-matrix
S. P. Miao, T. Prokopec, R. P. Woodard
We study one loop quantum gravitational corrections to the long range force induced by the exchange of a massless scalar between two massive scalars. The various diagrams contribut…
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…
Stochastic Inflationary Scalar Electrodynamics
T. Prokopec, N. C. Tsamis, R. P. Woodard
We stochastically formulate the theory of scalar quantum electrodynamics on a de Sitter background. This reproduces the leading infrared logarithms at each loop order. It also allo…
Constraints and Transport in Electroweak Baryogenesis
M. Joyce, T. Prokopec, N. Turok
In unconstrained thermal equilibrium a local potential for total or fermionic hypercharge does not bias electroweak anomalous processes. We consider two proposed mechanisms for ele…
One-loop Graviton Corrections to Conformal Scalars on a de Sitter Background
D. Glavan, S. P. Miao, T. Prokopec +1
We exploit a recent computation of one graviton loop corrections to the self-mass [1] to quantum-correct the field equation for a massless, conformally coupled scalar on a de Sitte…
Covariant Vacuum Polarizations on de Sitter Background
Katie E. Leonard, T. Prokopec, R. P. Woodard
We derive covariant expressions for the one loop vacuum polarization induced by a charged scalar on de Sitter background. Two forms are employed: one in which two covariant derivat…
MSSM Electroweak Baryogenesis and Flavour Mixing in Transport Equations
T. Konstandin, T. Prokopec, M. G. Schmidt +1
We make use of the formalism developed in Ref. [1], and calculate the chargino mediated baryogenesis in the Minimal Supersymmetric Standard Model. The formalism makes use of a grad…
Electrodynamic Effects of Inflationary Gravitons
D. Glavan, S. P. Miao, T. Prokopec +1
We calculate the one-loop corrections from inflationary gravitons to the electromagnetic fields of a point charge and a point magnetic dipole on a locally de Sitter space backgroun…
Transport equations for chiral fermions to order \hbar and electroweak baryogenesis: Part I
T. Prokopec, M. G. Schmidt, S. Weinstock
This is the first in a series of two papers. We use the Schwinger-Keldysh formalism to derive semiclassical Boltzmann transport equations for massive chiral fermions and scalar par…
Large Logarithms from Quantum Gravitational Corrections to a Massless, Minimally Coupled Scalar on de Sitter
D. Glavan, S. P. Miao, T. Prokopec +1
We consider single graviton loop corrections to the effective field equation of a massless, minimally coupled scalar on de Sitter background in the simplest gauge. We find a large…
Representing the Vacuum Polarization on de Sitter
Katie E. Leonard, T. Prokopec, R. P. Woodard
Previous studies of the vacuum polarization on de Sitter have demonstrated that there is a simple, noncovariant representation of it in which the physics is transparent. There is a…
Two Loop Scalar Bilinears for Inflationary SQED
T. Prokopec, N. C. Tsamis, R. P. Woodard
We evaluate the one and two loop contributions to the expectation values of two coincident and gauge invariant scalar bilinears in the theory of massless, minimally coupled scalar…
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…
Transport equations for chiral fermions to order \hbar and electroweak baryogenesis: Part II
T. Prokopec, M. G. Schmidt, S. Weinstock
This is the second in a series of two papers. While in Paper I we derive semiclassical Boltzmann transport equations and study their flow terms, here we address the collision terms…
Single Graviton Loop Contribution to the Self-Mass of a Massless, Conformally Coupled Scalar on de Sitter Background
D. Glavan, S. P. Miao, T. Prokopec +1
We use a simplified formalism to re-compute the single graviton loop contribution to the self-mass of a massless, conformally coupled scalar on de Sitter background which was origi…
One Loop Vaccum Polarization in a Locally de Sitter Background
T. Prokopec, O. Tornkvist, R. P. Woodard
We compute the one loop vacuum polarization from massless, minimally coupled scalar QED in a locally de Sitter background. Gauge invariance is maintained through the use of dimensi…
Vacuum polarization and photon mass in inflation
T. Prokopec, R. P. Woodard
We give a pedagogical review of a mechanism through which long wave length photons can become massive during inflation. Our account begins with a discussion of the period of expone…
Infrared Propagator Corrections for Constant Deceleration
T. M. Janssen, S. P. Miao, T. Prokopec +1
We derive the propagator for a massless, minimally coupled scalar on a -dimensional, spatially flat, homogeneous and isotropic background with arbitrary constant deceleration pa…
Graviton Propagator in a 2-Parameter Family of de Sitter Breaking Gauges
D. Glavan, S. P. Miao, T. Prokopec +1
We formulate the graviton propagator on de Sitter background in a 2-parameter family of simple gauges which break de Sitter invariance. Explicit results are derived for the first o…
Regulating the infrared by mode matching: A massless scalar in expanding spaces with constant deceleration
T. M. Janssen, T. Prokopec
In this paper we consider a massless scalar field, with a possible coupling to the Ricci scalar in a dimensional FLRW spacetime with a constant deceleration parameter $q=Î…
Production of Massless Fermions during Inflation
T. Prokopec, R. P. Woodard
We compute the one loop self energy, in a locally de Sitter background, for a massless fermion which is Yukawa-coupled to a massless, minimally coupled scalar. We then solve the mo…
Creation of cosmological magnetic fields in a bouncing cosmology
J. M. Salim, N. Souza, S. E. Perez Bergliaffa +1
We show (in a completely analytical and exact manner) that an efficient magnetic field amplification method is operative during the bounce in a time-dependent gauge coupling model.…
The Entropy of the Gravitational Field
R. Brandenberger, T. Prokopec, V. Mukhanov
We derive a formula for the nonequilibrium entropy of a classical stochastic field in terms of correlation functions of this field. The formalism is then applied to define the entr…