41 citations · 254 across the 19 of their papers we have counts for
19 papers
Power-law Bianchi type I inflation with multiple vector fields
Duy H. Nguyen, Tuan Q. Do
We investigate an inflationary anisotropic universe in a supergravity-motivated model with one scalar field non-minimally coupled to multiple vector fields. We restrict ourselves t…
Stability investigations of de Sitter inflationary solutions in power-law extensions of the Starobinsky model
Tuyen M. Pham, Duy H. Nguyen, Tuan Q. Do +1
In this paper, we would like to examine whether stable de Sitter inflationary solutions appear within power-law extensions of the Starobinsky model. In particular, we will address…
Anisotropic power-law inflation for models of non-canonical scalar fields non-minimally coupled to a two-form field
Tuyen M. Pham, Duy H. Nguyen, Tuan Q. Do +1
In this paper, we investigate the validity of the so-called cosmic no-hair conjecture in the framework of anisotropic inflation models of non-canonical scalar fields non-minimally…
Anisotropic power-law inflation for a generalized model of two scalar and two vector fields
Tuan Q. Do, W. F. Kao
Cosmological implication of a generalized model of two scalar and two vector fields, in which both scalar fields are non-minimally coupled to each vector field, is studied in this…
Anisotropic hyperbolic inflation for a model of two scalar and two vector fields
Tuan Q. Do, W. F. Kao
In this paper, we extend a recent proposed model of two scalar and two vector fields to a hyperbolic inflation scenario, in which the field space of two scalar fields is a hyperbol…
Anisotropic constant-roll inflation for the Dirac-Born-Infeld model
Duy H. Nguyen, Tuyen M. Pham, Tuan Q. Do
In this paper, we study a non-canonical extension of a supergravity-motivated model acting as a vivid counterexample to the cosmic no-hair conjecture due to its unusual coupling be…
k-Gauss-Bonnet inflation
Tuyen M. Pham, Duy H. Nguyen, Tuan Q. Do
We propose a novel {\it k}-Gauss-Bonnet inflationary model, in which a kinetic term of scalar field is allowed to non-minimally couple to the Gauss-Bonnet topological invariant in…
Anisotropic power-law inflation for a model of two scalar and two vector fields
Tuan Q. Do, W. F. Kao
Inspired by an interesting counterexample to the cosmic no-hair conjecture found in a supergravity-motivated model recently, we propose a multi-field extension, in which two scalar…
No-go theorem for inflation in an extended Ricci-inverse gravity model
Tuan Q. Do
In this paper, we propose an extension of the Ricci-inverse gravity, which has been proposed recently as a very novel type of fourth-order gravity, by introducing a second order te…
No-go theorem for inflation in Ricci-inverse gravity
Tuan Q. Do
We study a recent proposed Ricci-inverse gravity, which is a very novel type of fourth-order gravity. In particular, we are able to figure out both isotropically and anisotropicall…
Stable small spatial hairs in a power-law k-inflation model
Tuan Q. Do
In this paper, we extend our investigation of the validity of the cosmic no-hair conjecture within non-canonical anisotropic inflation. As a result, we are able to figure out an ex…
CMB imprints of non-canonical anisotropic inflation
Tuan Q. Do, W. F. Kao, Ing-Chen Lin
Effect of non-canonical scalar fields on the CMB imprints of the anisotropic inflation will be discussed in details in this paper. In particular, we are able to obtain the general…
No small hairs in anisotropic power-law Gauss-Bonnet inflation
Tuan Q. Do, Sonnet Hung Q. Nguyen
We will examine whether anisotropic hairs exist in a string-inspired scalar-Gauss-Bonnet gravity model with the absence of potential of scalar field during the inflationary phase.…
On the validity of cosmic no-hair conjecture in an anisotropic inflationary model
Tuan Q. Do
We will present main results of our recent investigations on the validity of cosmic no-hair conjecture proposed by Hawking and his colleagues long time ago in the framework of an a…
Anisotropic power-law inflation for a conformal-violating Maxwell model
Tuan Q. Do, W. F. Kao
A set of power-law solutions of a conformal-violating Maxwell model with a non-standard scalar-vector coupling will be shown in this paper. In particular, we are interested in a co…
Anisotropic power-law inflation in a two-scalar-field model with a mixed kinetic term
Tuan Q. Do, Sonnet Hung Q. Nguyen
We examine whether an extended scenario of a two-scalar-field model, in which a mixed kinetic term of canonical and phantom scalar fields is involved, admits the Bianchi type I met…
On five-dimensional massive (bi-)gravity
Tuan Q. Do
Main results of our recent investigations on five-dimensional scenarios of massive (bi-)gravity will be summarized in this article. In particular, we will show how to construct hig…
Higher dimensional massive bigravity
Tuan Q. Do
We study higher dimensional scenarios of massive bigravity, which is a very interesting extension of nonlinear massive gravity since its reference metric is assumed to be full dyna…
Higher dimensional nonlinear massive gravity
Tuan Q. Do
Inspired by a recent ghost-free nonlinear massive gravity in four-dimensional spacetime, we study its higher dimensional scenarios. As a result, we are able to show the constant-li…