Parity at the Planck scale
We explore the possibility that well known properties of the parity operator, such as its idempotency and unitarity, might break down at the Planck scale. Parity might then do more than just swap right and left polarized states and reverse the sign of spatial momentum k: it might generate superposit...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2018-06-01
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| Series: | Physics Letters B |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269318303113 |
| _version_ | 1819289784829345792 |
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| author | Michele Arzano Giulia Gubitosi João Magueijo |
| author_facet | Michele Arzano Giulia Gubitosi João Magueijo |
| author_sort | Michele Arzano |
| collection | DOAJ |
| description | We explore the possibility that well known properties of the parity operator, such as its idempotency and unitarity, might break down at the Planck scale. Parity might then do more than just swap right and left polarized states and reverse the sign of spatial momentum k: it might generate superpositions of right and left handed states, as well as mix momenta of different magnitudes. We lay down the general formalism, but also consider the concrete case of the Planck scale kinematics governed by κ-Poincaré symmetries, where some of the general features highlighted appear explicitly. We explore some of the observational implications for cosmological fluctuations. Different power spectra for right handed and left handed tensor modes might actually be a manifestation of deformed parity symmetry at the Planck scale. Moreover, scale-invariance and parity symmetry appear deeply interconnected. Keywords: Discrete symmetries, Quantum Gravity phenomenology |
| first_indexed | 2024-12-24T03:12:21Z |
| format | Article |
| id | doaj.art-d34bb0e50d74488b8de55e90155511c6 |
| institution | Directory Open Access Journal |
| issn | 0370-2693 |
| language | English |
| last_indexed | 2024-12-24T03:12:21Z |
| publishDate | 2018-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics Letters B |
| spelling | doaj.art-d34bb0e50d74488b8de55e90155511c62022-12-21T17:17:47ZengElsevierPhysics Letters B0370-26932018-06-01781510516Parity at the Planck scaleMichele Arzano0Giulia Gubitosi1João Magueijo2Dipartimento di Fisica, Università di Roma “La Sapienza”, P.le A. Moro 2, 00185 Roma, Italy; Sez. Roma1 INFN, P.le A. Moro 2, 00185 Roma, ItalyRadboud University, Institute for Mathematics, Astrophysics and Particle Physics, Heyendaalseweg 135, NL-6525 AJ Nijmegen, the Netherlands; Dipartimento di Fisica, Università di Roma “La Sapienza”, P.le A. Moro 2, 00185 Roma, Italy; Corresponding author.Theoretical Physics, Blackett Laboratory, Imperial College, London, SW7 2BZ, United KingdomWe explore the possibility that well known properties of the parity operator, such as its idempotency and unitarity, might break down at the Planck scale. Parity might then do more than just swap right and left polarized states and reverse the sign of spatial momentum k: it might generate superpositions of right and left handed states, as well as mix momenta of different magnitudes. We lay down the general formalism, but also consider the concrete case of the Planck scale kinematics governed by κ-Poincaré symmetries, where some of the general features highlighted appear explicitly. We explore some of the observational implications for cosmological fluctuations. Different power spectra for right handed and left handed tensor modes might actually be a manifestation of deformed parity symmetry at the Planck scale. Moreover, scale-invariance and parity symmetry appear deeply interconnected. Keywords: Discrete symmetries, Quantum Gravity phenomenologyhttp://www.sciencedirect.com/science/article/pii/S0370269318303113 |
| spellingShingle | Michele Arzano Giulia Gubitosi João Magueijo Parity at the Planck scale Physics Letters B |
| title | Parity at the Planck scale |
| title_full | Parity at the Planck scale |
| title_fullStr | Parity at the Planck scale |
| title_full_unstemmed | Parity at the Planck scale |
| title_short | Parity at the Planck scale |
| title_sort | parity at the planck scale |
| url | http://www.sciencedirect.com/science/article/pii/S0370269318303113 |
| work_keys_str_mv | AT michelearzano parityattheplanckscale AT giuliagubitosi parityattheplanckscale AT joaomagueijo parityattheplanckscale |