Axion hair and dynamical torsion from anomalies

Duncan, Malcolm J.; Kaloper, Nemanja; Olive, Keith A.

doi:10.1016/0550-3213(92)90052-d

Cited by 100 publications

(250 citation statements)

References 43 publications

Supporting

Mentioning

248

Contrasting

Order By: Relevance

“…In an effective field theory framework [9,18], the derivative of the Kalb-Ramond axion field ∂ µ b couples to the axial fermion current ψ i γ µ γ 5 ψ i , where i runs over fermion species of the Standard Model (SM), but the scalars couple only gravitationally to the SM fields (unless they are composites of heavy fermions which may couple to SM fields through loops). Hence the actual production mechanism of the global monopole solution at colliders, such as the LHC, and their detection, needs to be examined carefully.…”

Section: Discussion: Constraining the Model By Experimentsmentioning

confidence: 99%

“…Their inclusion for Abelian gauge fields could lead to additional interesting electromagnetic effects [17], which, however, are not of interest to us here. 7 In a Feynman path-integral formulation the dual theory for the Lagrangian (3.1) (in a Minkowski-signature space-time) is obtained [9,18] by implementing the Bianchi constraint (3.7) via a path-integral δ-function, which can then be represented using a Lagrange multiplier field b(x). The dual theory is obtained on integrating out the field H µνρ in the path-integral.…”

Section: A a Model For A Self-gravitating Global Monopole With Kalb-mentioning

confidence: 99%

See 1 more Smart Citation

Magnetic monopoles from global monopoles in the presence of a Kalb-Ramond Field

Mavromatos

Sarkar

2017

Phys. Rev. D

View full text Add to dashboard Cite

A classical solution for electromagnetic monopoles induced by gravitational (global) monopoles in the presence of a (four-dimensional) Kalb-Ramond axion field is found. The magnetic charge of such a solution is induced by a non-zero Kalb-Ramond field strength, prevalent in string theory.Bounds from the current run of the LHC experiments are used to constrain the parameters of the model. Because the production mechanism depends on the details of the model and its ultraviolet completion, such bounds, presently, are only indicative.

show abstract

Section: Discussion: Constraining the Model By Experimentsmentioning

confidence: 99%

Section: A a Model For A Self-gravitating Global Monopole With Kalb-mentioning

confidence: 99%

Magnetic monopoles from global monopoles in the presence of a Kalb-Ramond Field

Mavromatos

Sarkar

2017

Phys. Rev. D

View full text Add to dashboard Cite

show abstract

“…The background field / B ≡ γ μ B μ is assumed at most a function of the cosmic time, so as to respect the isotropy and homogeneity of the early universe, where such backgrounds are non-trivial. We note at this point that, if the axial background field B μ is to be identified [43] with the totally antisymmetric field strength (H μνρ = ∂ μ B ρσ + cyclic permutation of indices) of the Kalb-Ramond [44] spin-one field B μν , that appears in the massless gravitational multiplet of string theory [45][46][47], then the latter is viewed as part of a torsion background [48]: B μ = μνρλ H νρλ . In such a case one should also consider the coupling of the axial field B μ to all other fermions of the SM sector, ψ j ( j = leptons, quarks) via a universal minimal prescription, with the coupling with all fermionic species ψ being the same :…”

Section: Review Of the Cpt Violating Model For Leptogenesismentioning

confidence: 99%

“…The model was based on a specific extension of the SM, involving massive Majorana right-handed neutrinos (RHN), propagating on a Lorentz and CPTV, constant in time, axial vector background coupling to fermions. The latter could be traced back to a specific configuration of a cosmological Kalb-Ramond (KR) antisymmetric tensor field [44] that appears in the gravitational multiplet of string theory [45][46][47][48][49], and plays the rôle of torsion in a generalised connection, although we do not restrict ourselves to such an identification. 2 The involvement of sterile RHN in the model is physically motivated primarily by the need to provide a natural explanation for the light neutrino masses of the SM sector.…”

Section: Introductionmentioning

confidence: 99%

Leptogenesis from heavy right-handed neutrinos in CPT violating backgrounds

2018

View full text Add to dashboard Cite

We discuss leptogenesis in a model with heavy right-handed Majorana neutrinos propagating in a constant but otherwise generic CPT -violating axial time-like background (motivated by string theory). At temperatures much higher than the temperature of the electroweak phase transition, we solve approximately, but analytically (using Padé approximants), the corresponding Boltzmann equations, which describe the generation of lepton asymmetry from the tree-level decays of heavy neutrinos into Standard Model leptons. At such temperatures these leptons are effectively massless. The current work completes in a rigorous way a preliminary treatment of the same system, by some of the present authors. In this earlier work, lepton asymmetry was crudely estimated considering the decay of a righthanded neutrino at rest. Our present analysis includes thermal momentum modes for the heavy neutrino and this leads to a total lepton asymmetry which is bigger by a factor of two as compared to the previous estimate. Nevertheless, our current and preliminary results for the freezeout are found to be in agreement (within a ∼ 12.5% uncertainty). Our analysis depends on a novel use of Padé approximants to solve the Boltzmann equations and may be more widely useful in cosmology.

show abstract

“…It is an axial pseudovector field, one of the three types of structures appearing in the irreducible decomposition of T [850,853]. The gravitational part of the action can be written as…”

Section: Anomalous Majorana Neutrino Masses From Torsionful Quantum Gmentioning

confidence: 99%

A White Paper on keV sterile neutrino Dark Matter

Adhikari

Agostini

et al. 2017

J. Cosmol. Astropart. Phys.

380

316

View full text Add to dashboard Cite

Abstract. We present a comprehensive review of keV-scale sterile neutrino Dark Matter, collecting views and insights from all disciplines involved -cosmology, astrophysics, nuclear, and particle physics -in each case viewed from both theoretical and experimental/observational perspectives. After reviewing the role of active neutrinos in particle physics, astrophysics, and cosmology, we focus on sterile neutrinos in the context of the Dark Matter puzzle. Here, we first review the physics motivation for sterile neutrino Dark Matter, based on challenges and tensions in purely cold Dark Matter scenarios. We then round out the discussion by critically summarizing all known constraints on sterile neutrino Dark Matter arising from astrophysical observations, laboratory experiments, and theoretical considerations. In this context, we provide a balanced discourse on the possibly positive signal from X-ray observations. Another focus of the paper concerns the construction of particle physics models, aiming to explain how sterile neutrinos of keV-scale masses could arise in concrete settings beyond the Standard Model of elementary particle physics. The paper ends with an extensive review of current and future astrophysical and laboratory searches, highlighting new ideas and their experimental challenges, as well as future perspectives for the discovery of sterile neutrinos.

show abstract

Axion hair and dynamical torsion from anomalies

Cited by 100 publications

References 43 publications

Magnetic monopoles from global monopoles in the presence of a Kalb-Ramond Field

Magnetic monopoles from global monopoles in the presence of a Kalb-Ramond Field

Leptogenesis from heavy right-handed neutrinos in CPT violating backgrounds

A White Paper on keV sterile neutrino Dark Matter

Contact Info

Product

Resources

About