https://doi.org/10.1140/epjc/s10052-022-11158-3
Regular Article - Theoretical Physics
On possible composite structure of scalar fields in expanding universe
1
Kharkov Institute of Physics and Technology, 1, Akademicheskaya St., 61108, Kharkiv, Ukraine
2
NORDITA, KTH Royal Institute of Technology and Stockholm University, Hannes Alfvéns väg 12, 106 91, Stockholm, Sweden
Received:
8
October
2022
Accepted:
22
December
2022
Published online:
13
January
2023
Scalar fields in curved backgrounds are assumed to be composite objects. As an example realizing such a possibility we consider a model of the massless tensor field 
in a 4-dim. background 
with spontaneously broken Weyl and scale symmetries. It is shown that the potential of 
, represented by a scalar quartic polynomial, has the degenerate extremal described by the composite Nambu–Goldstone scalar boson 
. Removal of the degeneracy shows that 
acquires a non-zero vev 
which, together with the free parameters of the potential, defines the cosmological constant. The latter is zero for a certain choice of the parameters.
© The Author(s) 2023
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