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Cosmological constraints on extended Galileon models
Antonio De Felice, Shinji Tsujikawa
The extended Galileon models possess tracker solutions with de Sitter attractors along which the dark energy equation of state is constant during the matter-dominated epoch, i.e. w…
Vainshtein mechanism in second-order scalar-tensor theories
Antonio De Felice, Ryotaro Kase, Shinji Tsujikawa
In second-order scalar-tensor theories we study how the Vainshtein mechanism works in a spherically symmetric background with a matter source. In the presence of the field coupling…
Effective gravitational couplings for cosmological perturbations in the most general scalar-tensor theories with second-order field equations
Antonio De Felice, Tsutomu Kobayashi, Shinji Tsujikawa
In the Horndeski's most general scalar-tensor theories the equations of scalar density perturbations are derived in the presence of non-relativistic matter minimally coupled to gra…
Inflationary non-Gaussianities in the most general second-order scalar-tensor theories
Antonio De Felice, Shinji Tsujikawa
For very general scalar-field theories in which the equations of motion are at second-order, we evaluate the three-point correlation function of primordial scalar perturbations gen…
Observational test of inflation in loop quantum cosmology
Martin Bojowald, Gianluca Calcagni, Shinji Tsujikawa
We study in detail the power spectra of scalar and tensor perturbations generated during inflation in loop quantum cosmology (LQC). After clarifying in a novel quantitative way how…
Chaotic inflation in modified gravitational theories
Antonio De Felice, Shinji Tsujikawa, Joseph Elliston +1
We study chaotic inflation in the context of modified gravitational theories. Our analysis covers models based on (i) a field coupling with the kinetic energy and a nonm…