175 citations · 1.6k across the 58 of their papers we have counts for
59 papers
Poincaré symmetries and representations in pseudo-Hermitian quantum field theory
Esra Sablevice, Peter Millington
This paper explores quantum field theories with pseudo-Hermitian Hamiltonians, where PT-symmetric Hamiltonians serve as a special case. In specific regimes, these pseudo-Hermitian…
Axion-Photon Conversion in 3D Media and Astrophysical Plasmas
J. I. McDonald, B. Garbrecht, P. Millington
With axions now a primary candidate for dark matter, understanding their indirect astrophysical signatures is of paramount importance. Key to this is the production of photons from…
Oscillation probabilities for a PT-symmetric non-Hermitian two-state system
Jean Alexandre, Madeleine Dale, John Ellis +2
There is growing interest in viable quantum theories with PT-symmetric non-Hermitian Hamiltonians, but a formulation of transition matrix elements consistent with positivity and pe…
FeynMG: a FeynRules extension for scalar-tensor theories of gravity
Sergio Sevillano Muñoz, Edmund J. Copeland, Peter Millington +1
The ability to represent perturbative expansions of interacting quantum field theories in terms of simple diagrammatic rules has revolutionized calculations in particle physics (an…
Vertex functions and their flow equations from the 2PI effective action
Peter Millington, Paul M. Saffin
By exploiting the convexity of the two-particle-irreducible (2PI) effective action, we describe a procedure for extracting n-point vertex functions. This procedure is developed wit…
Cold Atoms in Space: Community Workshop Summary and Proposed Road-Map
Ivan Alonso, Cristiano Alpigiani, Brett Altschul +246
We summarize the discussions at a virtual Community Workshop on Cold Atoms in Space concerning the status of cold atom technologies, the prospective scientific and societal opportu…
Discrete spacetime symmetries, second quantization, and inner products in a non-Hermitian Dirac fermionic field theory
Jean Alexandre, John Ellis, Peter Millington
We extend to a non-Hermitian fermionic quantum field theory with PT symmetry our previous discussion of second quantization, discrete symmetry transformations, and inner products i…
Fifth forces and broken scale symmetries in the Jordan frame
Edmund J. Copeland, Peter Millington, Sergio Sevillano Muñoz
We study the origin of fifth forces in scalar-tensor theories of gravity in the so-called Jordan frame, where the modifications to the gravitational sector are manifest. We focus o…
Non-Hermiticity: a new paradigm for model building in particle physics
Peter Millington
Non-Hermitian quantum theories have been applied in many other areas of physics. In this note, I will briefly review recent developments in the formulation of non-Hermitian quantum…
EuCAPT White Paper: Opportunities and Challenges for Theoretical Astroparticle Physics in the Next Decade
R. Alves Batista, M. A. Amin, G. Barenboim +134
Astroparticle physics is undergoing a profound transformation, due to a series of extraordinary new results, such as the discovery of high-energy cosmic neutrinos with IceCube, the…
IR/UV mixing from local similarity maps of scalar non-Hermitian field theories
Maxim N. Chernodub, Peter Millington
We propose to "gauge" the group of similarity transformations that acts on a space of non-Hermitian scalar theories. We introduce the "similarity gauge field", which acts as a gaug…
Benchmarking regulator-sourced 2PI and average 1PI flow equations in zero dimensions
Peter Millington, Paul M. Saffin
We elucidate the regulator-sourced 2PI and average 1PI approaches for deriving exact flow equations in the case of a zero dimensional quantum field theory, wherein the scale depend…
Fifth-Force Screening around Extremely Compact Sources
Clare Burrage, Benjamin Elder, Peter Millington +2
Many non-linear scalar field theories possess a screening mechanism that can suppress any associated fifth force in dense environments. As a result, these theories can evade local…
Statistics on Lefschetz thimbles: Bell/Leggett-Garg inequalities and the classical-statistical approximation
Peter Millington, Zong-Gang Mou, Paul M. Saffin +1
Inspired by Lefschetz thimble theory, we treat Quantum Field Theory as a statistical theory with a complex Probability Distribution Function (PDF). Such complex-valued PDFs permit…
Discrete spacetime symmetries and particle mixing in non-Hermitian scalar quantum field theories
Jean Alexandre, John Ellis, Peter Millington
We discuss second quantization, discrete symmetry transformations and inner products in free non-Hermitian scalar quantum field theories with PT symmetry, focusing on a prototype m…
PT-Symmetric Non-Hermitian Quantum Field Theories with Supersymmetry
Jean Alexandre, John Ellis, Peter Millington
We formulate supersymmetric non-Hermitian quantum field theories with PT symmetry, starting with free chiral boson/fermion models and then including trilinear superpotential intera…
Spontaneously Breaking Non-Abelian Gauge Symmetry in Non-Hermitian Field Theories
Jean Alexandre, John Ellis, Peter Millington +1
We generalise our previous formulation of gauge-invariant PT-symmetric field theories to include models with non-Abelian symmetries and discuss the extension to such models of the…
A new functional RG flow: regulator-sourced 2PI versus average 1PI
Elizabeth Alexander, Peter Millington, Jordan Nursey +1
We derive the renormalization group evolution of the quartic scalar theory with spontaneous symmetry breaking from an alternative flow equation, obtained within the externally sour…
Alternative flow equation for the functional renormalization group
Elizabeth Alexander, Peter Millington, Jordan Nursey +1
We derive an alternative to the Wetterich-Morris-Ellwanger equation by means of the two-particle irreducible (2PI) effective action, exploiting the method of external sources due t…
Visualising quantum effective action calculations in zero dimensions
Peter Millington, Paul M. Saffin
We present an explicit treatment of the two-particle-irreducible (2PI) effective action for a zero-dimensional quantum field theory. The advantage of this simple playground is that…
Fifth forces and discrete symmetry breaking
Peter Millington
Modifications of general relativity often involve coupling additional scalar fields to the Ricci scalar, leading to scalar-tensor theories of Brans-Dicke type. If the additional sc…
Open quantum dynamics induced by light scalar fields
Clare Burrage, Christian Käding, Peter Millington +1
We consider the impact of a weakly coupled environment comprising a light scalar field on the open dynamics of a quantum probe field, resulting in a master equation for the probe f…
Symmetron Scalar Fields: Modified Gravity, Dark Matter or Both?
Clare Burrage, Edmund J. Copeland, Christian Käding +1
Scalar fields coupled to gravity through the Ricci scalar have been considered both as dark matter candidates and as a possible modified gravity explanation for galactic dynamics.…
Particle level screening of scalar forces in 1+1 dimensions
Clare Burrage, Benjamin Elder, Peter Millington
We investigate how non-linear scalar field theories respond to point sources. Taking the symmetron as a specific example of such a theory, we solve the non-linear equation of motio…