Work

Dynamically induced spin-2 mass in a Weyl-invariant framework

Year: 2025

Type: article

Abstract: We combine the ghost-free bimetric theory of gravity with the concept of local Weyl invariance, realized in the framework of Einstein-Cartan gravity. The gravitational sector, characterized by two independent metrics and two independent connections, is coupled to a scalar field that can in principle develop a nonvanishing expectation value through radiative corrections. The spectrum of the model, apart from the massless standard graviton and a pair of axionlike pseudoscalars, associated with the presence of the Holst invariants in the action, includes an additional spin-2 state of a nonvanishing Fierz-Pauli mass proportional to the scalar field vacuum expectation value. We analyze the phenomenology of the model and specify the conditions under which the massive spin-2 state could be a primary dark matter candidate.

Source: Physical review. D/Physical review. D.

DOI: 10.1103/hwht-srsz

Authors: Ioannis D. Gialamas, Kyriakos Tamvakis

Institutions: National Institute of Chemical Physics and Biophysics, University of Ioannina

Language: English

Topic: Cosmology and Gravitation Theories

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Funders: Council for Opportunity in Education, Eesti Teadusagentuur

Awards: CERN Science Consortium of Estonia, ESA Science Consortium of Estonia, G295263830, Solving Challenges in Cosmology and Particle Physics