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Gravitational waves in modified teleparallel theories of gravity
TLDR
It is shown that, if the boundary term is minimally coupled to the torsion scalar and the scalar field, gravitational waves have the same polarization modes of General Relativity.
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Multiple field modified gravity and localized energy in teleparallel framework
This work is devoted to drive an energy-momentum complex (due to matter and fields including gravity) in the realm of modified teleparallel gravity. For this purpose, the Lagrangian of teleparallel…
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Effective gravitational coupling in modified teleparallel theories
In the present study, we consider an extended form of teleparallel Lagrangian $f(T,\phi,X)$, as function of a scalar field $\phi$, its kinetic term $X$ and the torsion scalar $T$. We use linear…
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Primordial perturbations in multi-scalar inflation
TLDR
This work studies the hierarchy of parameters based on Hubble expansion rate in curved field space and derives the system of flow equations that describe their evolutions and focuses on obtaining derivatives of number of e-folds with respect to scalar fields during inflation and at hypersurface of the end of inflation.
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Planck scale effects on the stochastic gravitational wave background generated from cosmological hadronization transition: A qualitative study
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Thermodynamics in f(t;θ) Gravity
In the present study, we discuss a non-equilibrium picture of thermodynamics at the apparent horizon of flat Friedmann-Roberton-Walker universe in f(T,θ) theory of gravity, where T is the torsion…
Cosmological perturbations in gravitational energy–momentum complex
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Electroweak baryogenesis via chiral gravitational waves
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Electroweak phase transition in the presence of hypermagnetic field and the generation of gravitational waves
We investigate the effects of a large-scale background hypermagnetic field on the electroweak phase transition. We propose a model in which an effective weak angle varies during the electroweak phase…
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Gravitational constant in multiple field gravity
In the present study, we consider general form of the Lagrangian f(R, ϕI, X) , that is a function of the Ricci scalar, multiple scalar fields and non-canonical kinetic terms. We obtain the effective…
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