Pith Number

pith:WFPNSRKB

pith:2026:WFPNSRKB46B3J3ECTOAVF4PMV7

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Dipole light-matter interactions in the bispinor formalism

Alex J. Vernon, Francisco J. Rodr\'iguez-Fortu\~no, Sebastian Golat

The bispinor formalism unifies force, torque, power absorption, and helicity rate on dipoles by expressing them through broken symmetries.

arxiv:2605.13353 v1 · 2026-05-13 · physics.optics

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Claims

C1strongest claim

force, torque, absorbed power, and absorbed helicity rate can all be concisely expressed in terms of broken symmetries, and leads to the fundamental inequalities that dipolar particles' cross-sections must satisfy. This framework uncovers profound connections normally hidden behind complex algebra -- for instance, pressure forces depend exclusively on the difference in linear momenta of different light components and the corresponding breaking of symmetry by a particle, and optical recoil forces depend exclusively on helicity cross sections.

C2weakest assumption

That the bispinor formalism applies without further approximations to a very general case including chiral and nonreciprocal particles and that the resulting expressions fully capture the physical origins via broken symmetries.

C3one line summary

Bispinor formalism unifies dipole light-matter interactions by expressing force, torque, absorption, and helicity rates in terms of broken symmetries.

References

50 extracted · 50 resolved · 0 Pith anchors

[1] F. Alpeggiani, K. Y. Bliokh, F. Nori, and L. Kuipers, Electromagnetic helicity in complex media, Phys. Rev. Lett.120, 243605 (2018) 2018

[2] K. Y. Bliokh, A. Y. Bekshaev, and F. Nori, Extraordinary momentum and spin in evanescent waves, Nat. Commun. 5, 3300 (2014) 2014

[3] M. V. Berry, Optical currents, J. Opt. A: Pure Appl. Opt. 11, 094001 (2009) 2009

[4] M. G. Silveirinha, Chern invariants for continuous media, Phys. Rev. B92, 125153 (2015) 2015

[5] S. A. H. Gangaraj, M. G. Silveirinha, and G. W. Hanson, Berry phase, berry connection, and chern number for a continuum bianisotropic material from a classical elec- tromagnetics perspective, IEEE J. 2017

Cited by

1 paper in Pith

A Universal Magnetoelectric Limit for Chiral and Tellegen Bi-Isotropic Scatterers

Receipt and verification

First computed	2026-05-18T02:44:48.247648Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b15ed94541e783b4ec829b8152f1ecafc327ce1f71e72fde5819fda693bdd94b

Aliases

arxiv: 2605.13353 · arxiv_version: 2605.13353v1 · doi: 10.48550/arxiv.2605.13353 · pith_short_12: WFPNSRKB46B3 · pith_short_16: WFPNSRKB46B3J3EC · pith_short_8: WFPNSRKB

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Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/WFPNSRKB46B3J3ECTOAVF4PMV7 \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: b15ed94541e783b4ec829b8152f1ecafc327ce1f71e72fde5819fda693bdd94b

Canonical record JSON

{
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    "abstract_canon_sha256": "e0c98869c2e52c2bb2f032b6ee798983d9d9c44d1ef247046efa10ed0009396f",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "physics.optics",
    "submitted_at": "2026-05-13T11:12:37Z",
    "title_canon_sha256": "47e1c487be28803e642444909869e7bef936036a176841673c7bc4e3c9d05fef"
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  "source": {
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    "kind": "arxiv",
    "version": 1
  }
}