Fermionic field
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Fermion production during and after axion inflation Open
We study derivatively coupled fermions in axion-driven inflation,\nspecifically $m_\\phi^2\\phi^2$ and monodromy inflation, and calculate particle\nproduction during the inflationary epoch and the post-inflationary axion\noscillations. Dur…
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Rotating fermions inside a cylindrical boundary Open
We study a quantum fermion field inside a cylinder in Minkowski space-time. On the surface of the cylinder, the fermion field satisfies either spectral or MIT bag boundary conditions. We define rigidly-rotating quantum states in both cases…
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Constraints on mass dimension one fermionic dark matter from the Yukawa interaction Open
We study the loop corrections to the scalar propagator and the fermionic\nself-energy for the mass dimension one fermionic dark matter with the Yukawa\ninteraction. We find, in the former case, there is a non-vanishing\nLorentz-violating t…
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Unruh-DeWitt detector’s response to fermions in flat spacetimes Open
We examine an Unruh-DeWitt particle detector that is coupled linearly to the scalar density of a massless Dirac field in Minkowski spacetimes of dimension d≥2 and on the static Minkowski cylinder in spacetime dimension two, allowing the de…
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Evolution of the universe driven by a mass-dimension-one fermion field Open
This paper study the evolution of the universe filled with a neutral mass\ndimension one fermionic field, sometimes called Elko. The numerical analysis of\nthe coupled system of equations furnish a scale factor growth and energy\ndensity e…
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Fermion geometry and the renormalization of the Standard Model Effective Field Theory Open
A bstract The geometry of field space governs on-shell scattering amplitudes. We formulate a geometric description of effective field theories which extends previous results for scalars and gauge fields to fermions. The field-space geometr…
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Fermions in boundary conformal field theory: crossing symmetry and E-expansion Open
A bstract We use the equations of motion in combination with crossing symmetry to constrain the properties of interacting fermionic boundary conformal field theories. This combination is an efficient way of determining operator product exp…
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Transient anomalous charge production in strong-field QCD Open
We investigate axial charge production in two-color QCD out of equilibrium.\nWe compute the real-time evolution starting with spatially homogeneous strong\ngauge fields, while the fermions are in vacuum. The idealized class of initial\ncon…
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Fermionic Casimir effect in a field theory model with Lorentz symmetry violation Open
In this paper, we evaluate the Casimir energy and pressure for a massive\nfermionic field confined in the region between two parallel plates. In order to\nimplement this confinement we impose the standard MIT bag boundary on the\nplates fo…
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Cosmology of strongly interacting fermions in the early universe Open
In view of growing interest in long range scalar forces in the early universe to generate primordial black holes, we study in detail the general relativistic formulation of a Fermi gas interacting with a scalar field in cosmology. Motivate…
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Cosmological model with fermion and tachyon fields interacting via Yukawa-type potential Open
A model for the universe with tachyonic and fermionic fields interacting through a Yukawa-type potential is investigated. It is shown that the tachyonic field answers for the initial accelerated regime and for the subsequent decelerated re…
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Carroll fermions in two dimensions Open
Carroll symmetry is a very powerful characteristic of generic null surfaces, as it replaces the usual Poincar\'e algebra with a vanishing speed of light version thereof. These symmetries have found universal applications in the physics of …
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Asymptotically Safe Gravity-Fermion Systems on Curved Backgrounds Open
We set up a consistent background field formalism for studying the renormalization group (RG) flow of gravity coupled to Nf Dirac fermions on maximally symmetric backgrounds. Based on Wetterich’s equation, we perform a detailed study of th…
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Fermion production in a magnetic field in a de Sitter universe Open
The process of fermion production in the field of a magnetic dipole on a de\nSitter expanding universe is analyzed. The amplitude and probability for\nproduction of massive fermions are obtained using the exact solution of the\nDirac equat…
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Highly relativistic spin-gravity coupling for fermions Open
Descriptions of highly relativistic fermions in a gravitational field in the classical (nonquantum) and quantum approaches are discussed. The results following from the Mathisson-Papapetrou equations for a fast spinning particle in Schwarz…
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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…
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Renormalised fermion vacuum expectation values on anti-de Sitter space–time Open
The Schwinger-de Witt and Hadamard methods are used to obtain renormalised\nvacuum expectation values for the fermion condensate, charge current and\nstress-energy tensor of a quantum fermion field of arbitrary mass on\nfour-dimensional an…
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Wigner–Weyl formalism and the propagator of Wilson fermions in the presence of varying external electromagnetic field Open
We develop Wigner–Weyl formalism for the lattice models. For the definiteness we consider Wilson fermions in the presence of U(1) gauge field. The given technique reduces calculation of the two point fermionic Green function to solution of…
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Fermionic vacuum currents in topologically nontrivial braneworlds: Two-brane geometry Open
The vacuum expectation value (VEV) of the fermionic current density is investigated in the geometry of two parallel branes in locally AdS spacetime with a part of spatial dimensions compactified to a torus. Along the toral dimensions quasi…
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Fermionic isocurvature perturbations Open
Isocurvature perturbations in the inflationary literature typically involve\nquantum fluctuations of bosonic field degrees of freedom. In this work, we\nconsider isocurvature perturbations from fermionic quantum fluctuations during\ninflat…
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Fermionic currents in AdS spacetime with compact dimensions Open
We derive a closed expression for the vacuum expectation value (VEV) of the\nfermionic current density in a (D+1)-dimensional locally AdS spacetime with an\narbitrary number of toroidally compactified Poincare spatial dimensions and in\nth…
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Chiral kinetic theory with small mass corrections and quantum coherent states Open
We study the effect of a small fermion mass in the formulation of the\non-shell effective field theory (OSEFT). This is our starting point to derive\nsmall mass corrections to the chiral kinetic theory. In the massless case, only\nfour Wig…
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Discrete spacetime symmetries, second quantization, and inner products in a non-Hermitian Dirac fermionic field theory Open
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 in a scalar field theory [Phys. Rev. D 102, 125030 (2020)]. …
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Induced fermionic charge and current densities in two-dimensional rings Open
For a massive quantum fermionic field, we investigate the vacuum expectation values (VEVs) of the charge and current densities induced by an external magnetic flux in a two-dimensional circular ring. Both the irreducible representations of…
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Quantum computation of an interacting fermionic model Open
Relativistic fermionic field theories constitute the fundamental description of all observable matter. The simplest of the models provide a useful, classically verifiable benchmark for noisy intermediate scale quantum computers. We calcula…
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Unique Fock quantization of a massive fermion field in a cosmological scenario Open
It is well known that the Fock quantization of field theories in general\nspacetimes suffers from an infinite ambiguity, owing to the inequivalent\npossibilities in the selection of a representation of the canonical commutation\nor anticom…
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Dynamical generation of fermion mass hierarchy in an extra dimension Open
We propose a new mechanism to produce a fermion mass hierarchy dynamically in a model with a singlet generation of fermions. A five dimensional gauge theory on an interval with point interactions (zero-width branes) takes responsibility fo…
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Isotropization in Bianchi type-I cosmological model with fermions and bosons interacting via Yukawa potential Open
In this work we investigate a model for the early Universe in a Bianchi\ntype-I metric, where the sources of the gravitational field are a fermionic and\na bosonic field, interacting through a Yukawa potential, following the standard\nmode…
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Critical fermions with spontaneously broken scale symmetry Open
We study relativistic fermions in three euclidean dimensions with four- and six-fermion interactions of the Gross-Neveu type. In the limit of many fermion flavors, and besides the isolated free fixed point, the theory displays a line of in…
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Unitary evolution and uniqueness of the Fock representation of Dirac fields in cosmological spacetimes Open
We present a privileged Fock quantization of a massive Dirac field in a\nclosed Friedmann-Robertson-Walker cosmology, partially selected by the criteria\nof invariance of the vacuum under the symmetries of the field equations, and\nunitary…