Cargando…
The Dilaton Improves Goldstones
The free scalar field is only conformally invariant when non-minimally coupled to gravity. In flat space this amounts to amending, or improving, the energy momentum tensor. A no-go theorem prohibits the improvement for Goldstone bosons, originating from global internal spontaneous symmetry breaking....
Autor principal: | |
---|---|
Lenguaje: | eng |
Publicado: |
2023
|
Materias: | |
Acceso en línea: | http://cds.cern.ch/record/2862849 |
_version_ | 1780977889117732864 |
---|---|
author | Zwicky, Roman |
author_facet | Zwicky, Roman |
author_sort | Zwicky, Roman |
collection | CERN |
description | The free scalar field is only conformally invariant when non-minimally coupled to gravity. In flat space this amounts to amending, or improving, the energy momentum tensor. A no-go theorem prohibits the improvement for Goldstone bosons, originating from global internal spontaneous symmetry breaking. It is shown that the no-go theorem can be circumvented in the presence of a dilaton. The latter is a (pseudo) Goldstone boson originating from spontaneous conformal symmetry breaking in a theory with an infrared fixed point. Specifically, the tracelessness of the energy momentum tensor is demonstrated for a generic $d$-dimensional curved space. Additionally, the Goldstone gravitational form factors are shown to obey conformality constraints in the soft limit. The crucial point is that the remainder term of the soft theorem is non-zero due to the presence of the dilaton pole. For Goldstone systems with a trivial infrared fixed point the leading order analysis of this paper ought to be sufficient. Loop effects govern the improvement term outside the fixed point and are scheme-dependent as briefly discussed towards the end of the paper. |
id | cern-2862849 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 2023 |
record_format | invenio |
spelling | cern-28628492023-10-05T04:27:39Zhttp://cds.cern.ch/record/2862849engZwicky, RomanThe Dilaton Improves Goldstoneshep-phParticle Physics - Phenomenologyhep-latParticle Physics - Latticegr-qcGeneral Relativity and Cosmologyhep-thParticle Physics - TheoryThe free scalar field is only conformally invariant when non-minimally coupled to gravity. In flat space this amounts to amending, or improving, the energy momentum tensor. A no-go theorem prohibits the improvement for Goldstone bosons, originating from global internal spontaneous symmetry breaking. It is shown that the no-go theorem can be circumvented in the presence of a dilaton. The latter is a (pseudo) Goldstone boson originating from spontaneous conformal symmetry breaking in a theory with an infrared fixed point. Specifically, the tracelessness of the energy momentum tensor is demonstrated for a generic $d$-dimensional curved space. Additionally, the Goldstone gravitational form factors are shown to obey conformality constraints in the soft limit. The crucial point is that the remainder term of the soft theorem is non-zero due to the presence of the dilaton pole. For Goldstone systems with a trivial infrared fixed point the leading order analysis of this paper ought to be sufficient. Loop effects govern the improvement term outside the fixed point and are scheme-dependent as briefly discussed towards the end of the paper.arXiv:2306.12914CERN-TH-2023-101oai:cds.cern.ch:28628492023-06-22 |
spellingShingle | hep-ph Particle Physics - Phenomenology hep-lat Particle Physics - Lattice gr-qc General Relativity and Cosmology hep-th Particle Physics - Theory Zwicky, Roman The Dilaton Improves Goldstones |
title | The Dilaton Improves Goldstones |
title_full | The Dilaton Improves Goldstones |
title_fullStr | The Dilaton Improves Goldstones |
title_full_unstemmed | The Dilaton Improves Goldstones |
title_short | The Dilaton Improves Goldstones |
title_sort | dilaton improves goldstones |
topic | hep-ph Particle Physics - Phenomenology hep-lat Particle Physics - Lattice gr-qc General Relativity and Cosmology hep-th Particle Physics - Theory |
url | http://cds.cern.ch/record/2862849 |
work_keys_str_mv | AT zwickyroman thedilatonimprovesgoldstones AT zwickyroman dilatonimprovesgoldstones |