Year: 2026
Type: article
Abstract: In this work we explore the non-singular bouncing scenarios in the framework of 𝑓 ( 𝑄 , ℒ 𝑚 ) gravity, where the gravitational action depends on the non-metricity scalar ( Q ) and matter Lagrangian density ( ℒ 𝑚 ) . Using the functional form 𝑓 ( 𝑄 , ℒ 𝑚 ) = − 𝛼 𝑄 + 2 ℒ 𝑚 + 𝛽 , two different bouncing scenario models are analyzed in a homogeneous, isotropic and flat FLRW universe. The cosmological evolution is analyzed through the behavior of the Hubble parameter, deceleration parameter, energy density, pressure, and equation of state parameter. Both models exhibit a successful bounce characterized by a smooth transition from a contracting universe ( H < 0) to an expanding phase ( H > 0) without encountering any initial singularity ( 𝐻 = 0 ) . The EOS parameter exhibits phantom crossing behavior, while the energy conditions reveal NEC and SEC violation around the bounce, consistent with bouncing cosmology requirements. Stability analysis through metric perturbations and adiabatic index confirms stable late-time cosmic evolution. The study suggests that 𝑓 ( 𝑄 , ℒ 𝑚 ) theory offers a promising geometrical background for understanding non-singular early universe dynamics and bouncing scenarios.
Source: Physics Letters B
Institution: GLA University
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
Award: G49936753
OpenAlex ID: W7220423505