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View article: Leptogenesis and the relativistic degrees of freedom of the plasma
Leptogenesis and the relativistic degrees of freedom of the plasma Open
We investigate the impact of the temperature dependence of the relativistic degrees of freedom (dofs) of the plasma on lepton and baryon asymmetry. Motivated by the significant effect of the varying dofs on the tri-resonant leptogenesis pa…
View article: Supergeometric quantum effective action
Supergeometric quantum effective action Open
Supergeometric quantum field theories (SG-QFTs) are theories that go beyond the standard supersymmetric framework, since they allow for general scalar-fermion field transformations on the configuration space of a supermanifold, without req…
View article: Dirac Algebra Formalism for Two Higgs Doublet Models: the One-Loop Effective Potential
Dirac Algebra Formalism for Two Higgs Doublet Models: the One-Loop Effective Potential Open
We present a novel covariant bilinear formalism for the Two Higgs Doublet Model (2HDM) which utilises the Dirac algebra associated with the SL(2,C) group that acts on the scalar doublet field space. This Dirac-algebra approach enables us t…
View article: Supergeometric Approach to Quantum Field Theory
Supergeometric Approach to Quantum Field Theory Open
We review a recently proposed SuperGeometric (SG) approach to Quantum Field Theories (QFTs) that allow for scalar-fermion field transformations in a manifestly reparameterisation covariant manner. By adopting natural choices for the field-…
View article: Supergeometric Quantum Effective Action
Supergeometric Quantum Effective Action Open
Supergeometric Quantum Field Theories (SG-QFTs) are theories that go beyond the standard supersymmetric framework, since they allow for general scalar-fermion field transformations on the configuration space of a supermanifold, without req…
View article: Maximising CP Violation in naturally aligned Two-Higgs Doublet Models
Maximising CP Violation in naturally aligned Two-Higgs Doublet Models Open
A bstract The Two-Higgs Doublet Model (2HDM) is a well-motivated theoretical framework that provides additional sources of CP Violation (CPV) beyond the Standard Model (SM). After studying the vacuum topology of a general (convex) 2HDM pot…
View article: Supergeometric Approach to Quantum Field Theory
Supergeometric Approach to Quantum Field Theory Open
We review a recently proposed SuperGeometric (SG) approach to Quantum Field Theories (QFTs) that allow for scalar-fermion field transformations in a manifestly reparameterisation covariant manner. By adopting natural choices for the field-…
View article: Erratum: Quantum coherence of critical unstable two-level systems [Phys. Rev. D <b>108</b>, 016006 (2023)]
Erratum: Quantum coherence of critical unstable two-level systems [Phys. Rev. D <b>108</b>, 016006 (2023)] Open
Received 4 March 2024DOI:https://doi.org/10.1103/PhysRevD.109.059901Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain a…
View article: Varying entropy degrees of freedom effects in low-scale leptogenesis
Varying entropy degrees of freedom effects in low-scale leptogenesis Open
We analyze in detail the effect of varying entropy degrees of freedom on low-scale leptogenesis models. As an archetypal model, we consider the triresonant leptogensis (TRL) scenario introduced recently by the authors, where the neutrino-Y…
View article: Maximising CP Violation in Naturally Aligned Two-Higgs Doublet Models
Maximising CP Violation in Naturally Aligned Two-Higgs Doublet Models Open
The Two-Higgs Doublet Model (2HDM) is a well-motivated theoretical framework that provides additional sources of CP Violation (CPV) beyond the Standard Model (SM). After studying the vacuum topology of a general (convex) 2HDM potential, we…
View article: Tri-Resonant Leptogenesis
Tri-Resonant Leptogenesis Open
We present a class of leptogenesis models where the light neutrinos acquire their observed mass through a symmetry-motivated construction. We consider an extension of the Standard Model, which includes three singlet neutrinos which have ma…
View article: Minimal supergeometric quantum field theories
Minimal supergeometric quantum field theories Open
We formulate minimal SuperGeometric Quantum Field Theories (SG-QFTs) that allow for scalar-fermion field transformations in a manifestly reparameterisation covariant manner. First, we discuss the issue of uniqueness in defining the field-s…
View article: Varying Entropy Degrees of Freedom Effects in Low-Scale Leptogenesis
Varying Entropy Degrees of Freedom Effects in Low-Scale Leptogenesis Open
We analyse in detail the effect of varying entropy degrees of freedom on low-scale leptogenesis models. As an archetypal model, we consider the Tri-Resonant Leptogensis${}$ (TRL) scenario introduced recently by the authors, where the neutr…
View article: Quantum coherence of critical unstable two-level systems
Quantum coherence of critical unstable two-level systems Open
We study in detail the dynamics of unstable two-level quantum systems by adopting the Bloch-sphere formalism of qubits. By employing the Bloch-vector representation for such unstable qubit systems, we identify a novel class of critical sce…
View article: Minimal Supergeometric Quantum Field Theories
Minimal Supergeometric Quantum Field Theories Open
We formulate minimal SuperGeometric Quantum Field Theories (SG-QFTs) that allow for scalar-fermion field transformations in a manifestly reparameterisation covariant manner. First, we discuss the issue of uniqueness in defining the field-s…
View article: Tri-Resonant Leptogenesis
Tri-Resonant Leptogenesis Open
We present a class of leptogenesis models where the light neutrinos acquire their observed mass through a symmetry-motivated construction. We consider an extension of the Standard Model, which includes three singlet neutrinos which have ma…
View article: Quantum Coherence of Critical Unstable Two-Level Systems
Quantum Coherence of Critical Unstable Two-Level Systems Open
We study in detail the dynamics of unstable two-level quantum systems by adopting the Bloch-sphere formalism of qubits. By employing the Bloch-vector representation for such unstable qubit systems, we identify a novel class of critical sce…
View article: Geometrising the Micro-Cosmos on a Supermanifold
Geometrising the Micro-Cosmos on a Supermanifold Open
For more than half a century, covariant and differential geometric methods have been playing a central role in the development of Quantum Field Theory (QFT). After a brief historic overview of the major scientific achievements using these …
View article: Tri-resonant leptogenesis in a seesaw extension of the Standard Model
Tri-resonant leptogenesis in a seesaw extension of the Standard Model Open
A bstract We study a class of leptogenesis models where the light neutrinos acquire their observed small masses by a symmetry-motivated construction. This class of models may naturally include three nearly degenerate heavy Majorana neutrin…
View article: Towards a Localised S-Matrix Theory
Towards a Localised S-Matrix Theory Open
We formulate an S-matrix theory in which localisation effects of the particle interactions involved in a scattering process are consistently taken into account. In the limit of an infinite spread of all interactions, the S-matrix assumes i…
View article: Frictionless UV-finite Instantons in Curved Spacetime
Frictionless UV-finite Instantons in Curved Spacetime Open
We identify a new class of UV-complete instanton solutions that describe the false vacuum\- decay of a real scalar field in a particular curved spacetime background. To this end, we consider a simple scalar theory with a Coleman potential …
View article: Tri-Resonant Leptogenesis in a Seesaw Extension of the Standard Model
Tri-Resonant Leptogenesis in a Seesaw Extension of the Standard Model Open
We study a class of leptogenesis models where the light neutrinos acquire their observed small masses by a symmetry-motivated construction. This class of models may naturally include three nearly degenerate heavy Majorana neutrinos that ca…
View article: Higgs-Sector Predictions from Maximally Symmetric multi-Higgs Doublet Models
Higgs-Sector Predictions from Maximally Symmetric multi-Higgs Doublet Models Open
Maximally Symmetric n-Higgs Doublet Models (MS-nHDMs) define very economic settings that enable sharp Higgs-sector predictions beyond the Standard Model (SM) potentially testable at high-energy colliders. The scalar potential of a MS-nHDM …
View article: Geometrising the Micro-Cosmos on a Supermanifold
Geometrising the Micro-Cosmos on a Supermanifold Open
For more than half a century, covariant and differential geometric methods have been playing a central role in the development of Quantum Field Theory (QFT). After a brief historic overview of the major scientific achievements using these …
View article: Charged and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>C</mml:mi><mml:mi>P</mml:mi></mml:math>-violating kink solutions in the two-Higgs-doublet model
Charged and -violating kink solutions in the two-Higgs-doublet model Open
Minimal extensions of the Standard Model (SM), such as the so-called Two\nHiggs Doublet Model (2HDM), can possess several accidental discrete symmetries\nwhose spontaneous breakdown in the early universe usually lead to the formation\nof d…
View article: Collider probes of the MSSM Higgs sector with explicit CP violation
Collider probes of the MSSM Higgs sector with explicit CP violation Open
We investigate the hadron collider phenomenology of the Minimal Supersymmetric Standard Model (MSSM) with explicit CP violation for Higgs bosons that can be observed in Standard Model search channels: W/ZHi( → b¯b) at the Tevatron, and gg …
View article: A Repository for Beyond-the-Standard-Model Tools
A Repository for Beyond-the-Standard-Model Tools Open
To aid phenomenological studies of Beyond-the-Standard-Model (BSM) physics scenarios, a web repository for BSM calculational tools has been created. We here present brief overviews of the relevant codes, ordered by topic as well as by alph…
View article: CPsuperH: A Computational tool for Higgs phenomenology in the minimal supersymmetric standard model with explicit CP violation
CPsuperH: A Computational tool for Higgs phenomenology in the minimal supersymmetric standard model with explicit CP violation Open
We provide a detailed description of the Fortran code CPsuperH, a newly–developed computational package that calculates the mass spectrum and decay widths of the neutral and charged Higgs bosons in the Minimal Supersymmetric Standard Model…