تقرير
Particle spectra of general Ricci-type Palatini or metric-affine theories
| العنوان: | Particle spectra of general Ricci-type Palatini or metric-affine theories |
|---|---|
| المؤلفون: | Barker, W., Marzo, C. |
| سنة النشر: | 2024 |
| المجموعة: | General Relativity and Quantum Cosmology High Energy Physics - Theory |
| مصطلحات موضوعية: | High Energy Physics - Theory, General Relativity and Quantum Cosmology |
| الوصف: | In the context of weak-field metric-affine (i.e. Palatini) gravity near Minkowski spacetime, we compute the particle spectra in the simultaneous presence of all independent contractions quadratic in Ricci-type tensors. Apart from the full metric-affine geometry, we study kinematic limits with vanishing torsion (i.e. a symmetric connection) and vanishing non-metricity (i.e. a metric connection, which is physically indistinguishable from Poincar\'e gauge theory at the level of the particle spectrum). We present a detailed report on how spin-parity projection operators can be used to derive systematically and unambiguously the character of the propagating states. The unitarity constraints derived from the requirements of tachyon- and ghost-freedom are obtained. We show that, even in the presence of all Ricci-type operators, only a narrow selection of viable theories emerges by a tuning. Comment: added references, version submitted to journal |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2402.07641 |
| رقم الأكسشن: | edsarx.2402.07641 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |