Non-minimal Unimodular Inflation
arXiv:2608.20095 · doi:10.1016/j.dark.2023.101405
Abstract
We study an extension of the unimodular cosmological inflation in the context of the non-minimal coupling of a generic scalar field with gravitational sector. We consider the non-minimal coupling of the scalar field and gravity as the only source of energy-momentum tensor in this setup. Without introducing new particles other than those already existing in electroweak theory, the generic scalar field's non-minimal coupling is responsible for the generation of the seeds of perturbations for structure formation and the observed Cosmic Microwave Background anisotropies in this scenario. We calculate inflation parameters in both the Jordan and Einstein frames, and then we study primordial spectral indices for slow-roll parameters in Einstein's frame at the first and second orders. The numerical results of this model are consistent with the Planck2018 and BICEP/Keck joint data sets in some subspaces of the model parameters space. By considering a sufficient amount of inflation, we estimate the strength of the non-minimal coupling parameter, , to find appropriate new constraints on the values of this parameter. By comparing the numerical values of the inflation observables in two frames and also with observation, we comment on the issue of frames in this framework.
27 pages, 8 figures, 4 table
References in corpus (36)
- Modified Gravity Theories on a Nutshell: Inflation, Bounce and Late-time Evolution
- Planck 2018 results. X. Constraints on inflation
- The Standard Model Higgs boson as the inflaton
- Encyclopaedia Inflationaris
- BICEP / Keck XIII: Improved Constraints on Primordial Gravitational Waves using Planck, WMAP, and BICEP/Keck Observations through the 2018 Observing Season
- Standard Model Higgs boson mass from inflation: two loop analysis
- New Model of Inflation with Non-minimal Derivative Coupling of Standard Model Higgs Boson to Gravity
- The Cosmological Constant Problem and Quintessence
- On Inflation with Non-minimal Coupling
- Higgs inflation
- The Higgs field as an inflaton
- Inflation, Cosmic Perturbations and Non-Gaussianities
- Density perturbations in generalized Einstein scenarios and constraints on nonminimal couplings from the Cosmic Microwave Background
- F(R) gravity and inflation
- Cosmological Perturbations in Unimodular Gravity
- Inflation by non-minimal coupling
- Unimodular Gravity
- Non-Minimal Inflation after WMAP3
- Darkness without dark matter and energy -- generalized unimodular gravity
- Planck and BICEP/Keck Array 2018 constraints on primordial gravitational waves and perspectives for future B-mode polarization measurements
- Unimodular Gravity
- Non-Minimal Inflation Revisited
- Cosmological Implications of Unimodular Gravity
- Higgs inflation and quantum gravity: An exact renormalisation group approach
- Testing Unimodular Gravity
- Self-unitarization of New Higgs Inflation and compatibility with Planck and BICEP2 data
- Non-Gaussianities of Single Field Inflation with Non-minimal Coupling
- Reconstruction of a Nonminimal Coupling Theory with Scale-invariant Power Spectrum
- Quartic inflation and radiative corrections with non-minimal coupling
- Non-minimal Tinges of Unimodular Gravity
- -models for inflation
- Higgs inflation with non-minimal derivative coupling to gravity
- Analyzing modified unimodular gravity via Lagrange multipliers
- Inflation and the cosmological (not-so) constant in unimodular gravity
- Reheating and particle creation in unimodular f(R, T) gravity
- Reconstruction of inflationary scenarios in non-conservative unimodular gravity