Revisiting higher-spin gyromagnetic couplings
Revisiting higher-spin gyromagnetic couplings
We analyze Bosonic, Heterotic, and Type II string theories compactified on a generic torus having constant moduli. By computing the hamiltonian giving the interaction between massive string excitations and $U(1)$ gauge fields arising from the graviton and Kalb-Ramond field upon compactification, we derive a general formula for such couplings that turns out to be universal in all these theories. We also confirm our result by explicitly evaluating the relevant string three-point amplitudes. From this expression, we determine the gyromagnetic ratio $g$ of massive string states coupled to both gauge-fields. For a generic mixed symmetry state, there is one gyromagnetic coupling associated with each row of the corresponding Young Tableau diagram. For all the states having zero Kaluza Klein or Winding charges, the value of $g$ turns out to be $1$. We also explicitly consider totally symmetric and mixed symmetry states (having two rows in the Young diagram) associated with the first Regge-trajectory and obtain their corresponding $g$ value.
Marotta, Raffaele
d897466b-d0a2-4bab-947d-73d76c1a8b8e
Taronna, Massimo
f7cfc7a0-1349-4633-bd9c-9444f8c0ba80
Verma, Mritunjay
eefb3825-946d-406e-9f92-c80ba123a3bb
29 June 2021
Marotta, Raffaele
d897466b-d0a2-4bab-947d-73d76c1a8b8e
Taronna, Massimo
f7cfc7a0-1349-4633-bd9c-9444f8c0ba80
Verma, Mritunjay
eefb3825-946d-406e-9f92-c80ba123a3bb
Marotta, Raffaele, Taronna, Massimo and Verma, Mritunjay
(2021)
Revisiting higher-spin gyromagnetic couplings.
Journal of High Energy Physics, 168.
(doi:10.48550/arXiv.2102.13180).
Abstract
We analyze Bosonic, Heterotic, and Type II string theories compactified on a generic torus having constant moduli. By computing the hamiltonian giving the interaction between massive string excitations and $U(1)$ gauge fields arising from the graviton and Kalb-Ramond field upon compactification, we derive a general formula for such couplings that turns out to be universal in all these theories. We also confirm our result by explicitly evaluating the relevant string three-point amplitudes. From this expression, we determine the gyromagnetic ratio $g$ of massive string states coupled to both gauge-fields. For a generic mixed symmetry state, there is one gyromagnetic coupling associated with each row of the corresponding Young Tableau diagram. For all the states having zero Kaluza Klein or Winding charges, the value of $g$ turns out to be $1$. We also explicitly consider totally symmetric and mixed symmetry states (having two rows in the Young diagram) associated with the first Regge-trajectory and obtain their corresponding $g$ value.
Text
JHEP06(2021)168
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Accepted/In Press date: 10 June 2021
Published date: 29 June 2021
Identifiers
Local EPrints ID: 483023
URI: http://eprints.soton.ac.uk/id/eprint/483023
ISSN: 1126-6708
PURE UUID: 9a148ad0-8575-47c8-944a-c30f35b78bd5
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Date deposited: 19 Oct 2023 16:53
Last modified: 17 Mar 2024 05:15
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Author:
Raffaele Marotta
Author:
Massimo Taronna
Author:
Mritunjay Verma
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