Papers by Phongpichit Channuie
Nuclear Physics B
In this work, we study warm inflationary scenario based on a deformation of R 2 gravity. We start... more In this work, we study warm inflationary scenario based on a deformation of R 2 gravity. We start considering R p and assume p = 2(1 + δ) with δ 1 so that we simply obtain warm R 2 inflation when setting δ = 0. We then derive the potential in the Einstein frame and consider a dissipation parameter of the form Γ = C 1 T with C 1 being a coupling parameter. We focus only on the strong regime of which the interaction between inflaton and radiation fluid has been taken into account. We compute inflationary observables and constrain the parameters of our model using latest observational data reported by Planck. From our analysis, we discover that with proper choices of parameters the derived n s and r are in good agreement with the Planck 2018 observational constraints. Particularly, we constrain the potential scale U 0 of the models.
Nuclear Physics B
In this work, we examine thermalon phase transition between AdS and dS vacua in Einstein-Gauss-Bo... more In this work, we examine thermalon phase transition between AdS and dS vacua in Einstein-Gauss-Bonnet gravity by considering the Rényi statistics. The thermalon change the asymptotic structure of spacetimes via the bubble nucleation of spherical thinshells which host a black hole in the interior. All relevant thermodynamical quantities are computed in terms of the Rényi statistics in order to demonstrate the possible existence of the AdS to dS phase transition. In addition, we also comment on the behaviors of the phase transitions in the Rényi statistics.
The European Physical Journal C
In this work, gravitational phase transition emerging from anti de-Sitter (AdS) to de-Sitter (dS)... more In this work, gravitational phase transition emerging from anti de-Sitter (AdS) to de-Sitter (dS) vacua in Einstein–Gauss–Bonnet-massive gravity (EGBMG) is considered. We determine the location of thermalon (a static bubble solution in Euclidean space) which exists in casually connected two regions of the spacetime. The thermalon plays a major role in gravitational phase transition by inducing the decay of the negative effective cosmological constant to the positive one due to the higher-order gravity effects. The thermodynamics phase space of the Hawking temperature and free energy is investigated in details. We find that the free energy of the thermalon is always negative at the maximum of Hawking temperature for all possible values of the Gauss–Bonnet couplings. This means that the phase transition mediated by thermalon from AdS to dS asymptotics is inevitable according to the presence of the massive gravity. More importantly, the parameters of the massive gravity behave similarl...
arXiv (Cornell University), Mar 14, 2022
The pandemic caused by the SARS-CoV-2 virus has threaten the face-to-face teaching activity in bo... more The pandemic caused by the SARS-CoV-2 virus has threaten the face-to-face teaching activity in both schools and universities. The transformation from face-to-face classes to online activities yielded inefficient outcomes from the activities. Particularly, a key issue was organizing laboratory activities without accessing the labs. In this paper, we propose how to overcome this problem by enabling the students to perform physics experiments of fluid draining at home. In other words, the use of equipment commonly available at home or that can be purchased at a low price is practically plausible. In the present work, we do an experimental investigation of liquid draining through a hole of a container. From an analyzing step, we introduce a freely-accessible video analysis software, Tracker, to obtain accurate results. Interestingly, we observe the effects of viscosity causing a delay of draining time of liquids. Our study shows that a ratio of open-space radius of the container to the hole radius, √ λ, can be used to determine a draining time.
The European Physical Journal C
In this work, we examine solutions of the system of equations obtained by applying the Noether ga... more In this work, we examine solutions of the system of equations obtained by applying the Noether gauge symmetry (NGS) and its conserved quantity for the standard general relativity (GR) and the non-minimal derivative coupling (NMDC) cosmological model. We discover two salient features of the solutions. The first one is $$a(t)\propto t^{1/3}$$ a ( t ) ∝ t 1 / 3 for a kinetic-dominant phase which may emerge before inflationary period at very early time for GR case. The second one is a new form of scalar field $$\phi (t)$$ ϕ ( t ) govern by the exponential cosmological solution for NMDC case, $$\phi (t)=(c_{1}+c_{2}t)e^{-\lambda t}+c_{3}$$ ϕ ( t ) = ( c 1 + c 2 t ) e - λ t + c 3 .
The European Physical Journal C
In this work, we investigate the non-minimally coupled scenario in the context of warm inflation ... more In this work, we investigate the non-minimally coupled scenario in the context of warm inflation with quantum-corrected self-interacting potential. We transform the potential in the Jordan frame to the Einstein frame and consider a dissipation parameter of the form $$\Gamma = C_{T}T$$ Γ = C T T with $$C_T$$ C T being a coupling parameter. We focus on the strong regime of which the interaction between inflaton and radiation fluid has been taken into account. We compute inflationary observables and constrain the parameters of our model using current Planck 2018 data. With the sizeable number of e-folds and proper choices of parameters, we discover that allowed values of $$C_T$$ C T lie in the range $$0.014\lesssim C_{T}\lesssim 0.020$$ 0.014 ≲ C T ≲ 0.020 in which the predictions are in good agreement with the latest Planck 2018 results at the $$2\,\sigma $$ 2 σ confident level.
Nuclear Physics B
In this paper, we investigate new exact and analytic solutions of the Einstein-Maxwell field equa... more In this paper, we investigate new exact and analytic solutions of the Einstein-Maxwell field equations describing Casimir wormholes with and without the effect of the Generalized Uncertainty Principle (GUP). In particular, we consider a specific type of the GUP relation as an example. We implement three specific models of the redshift function along with two different EoS of state given by p r (r) = ω r (r)ρ(r) along with p t (r) = ω t (r)ρ(r) and obtain a class of asymptotically flat Casimir wormhole solutions with and without GUP corrections under the effect of electric charge. Furthermore we check the null, weak, and strong conditions at the wormhole throat with a radius r 0 , and show that in general the classical energy conditions are violated by some arbitrary small quantity at the wormhole throat. Importantly, we examine the wormhole geometry with semi-classical corrections via embedding diagrams. We also consider the volume integral quantifier to calculate the amount of the exotic matter near the wormhole throat.
International Journal of Modern Physics D
In order to validate or invalidate a large class of low energy effective theories, the swampland ... more In order to validate or invalidate a large class of low energy effective theories, the swampland conjecture has attracted significant attention recently. It can be stated as inequalities on the potential of a scalar field which is conjectured to satisfy certain constraints. In this work, we discuss the theoretical viability of deformed Starobinsky gravity in light of the refined swampland conjectures. We consider the deformation of the form [Formula: see text] with [Formula: see text] being a constant. We then constrain [Formula: see text] using the spectral index of curvature perturbation [Formula: see text] and the tensor-to-scalar ratio [Formula: see text]. We demonstrate that the model under consideration is in strong tension with the refined swampland conjecture. However, regarding our analysis with proper choices of parameters [Formula: see text] and [Formula: see text], we discover that the model can always satisfy this new refined swampland conjecture. Therefore, the model m...
Physical Review D
In this work, we investigate warm inflationary models in the context of a general scalar-tensor t... more In this work, we investigate warm inflationary models in the context of a general scalar-tensor theory of gravity which is coupled to radiation through a dissipation term. We first derive the potential of exponential and hyperbolic tangent forms. We consider a dissipation parameter of the form Γ = C 1 T with C 1 being a coupling parameter and focus only on the strong regime of which the interaction between inflaton and radiation fluid has been taken into account. We compute inflationary observables and constrain the parameters of our model using current Planck 2018 data. From our analysis, we discover that the weak coupling limit ξ 1 is needed in order to have the derived n s and r consistent with the Planck 2018 observational constraints. Particularly, we constrain the potential scale V 0 of the models.
Fortschritte der Physik
An alternative refined de Sitter conjecture giving rise to a natural combination of the first and... more An alternative refined de Sitter conjecture giving rise to a natural combination of the first and second derivatives of the scalar potential was proposed recently by David Andriot and Christoph Roupec (Fortsch. Phys. 67 (2019) no.1-2, 1800105). In this work, we study the inflation models in a general scalar-tensor theory with exponential and hyperbolic tangent forms of potential as well as model with quantum corrected potential and examine whether these three models of inflation can satisfy this further refining de Sitter swampland conjecture or not. Regarding our analysis with proper choices of parameters with proper choices of parameters a, b = 1 − a and q, we find that these three inflationary models can always satisfy this new refined swampland conjecture. Therefore, all three inflationary models might all be in "landscape" since the "further refining de Sitter swampland conjecture" is satisfied.
The European Physical Journal C, 2022
In this work, we investigate the Higgs–Starobinsky (HS) model in the context of warm inflation sc... more In this work, we investigate the Higgs–Starobinsky (HS) model in the context of warm inflation scenario. The dissipative parameter as a linear form of temperature of warm inflation is considered with strong and weak regimes. We study the HS model in the Einstein frame using the slow-roll inflation framework. The inflationary observables are computed and then compared with the Plank 2018 data. With the sizeable number of e-folds and proper choices of parameters, we discover that the predictions of warm HS model present in this work are in very good agreement with the latest Planck 2018 results. More importantly, the parameters of the HS model are also constrained by using the data in order to make warm HS inflation successful.
A divergence-free theory with f(R,R_μνR^μν)=2R_μνR^μν-R^2 was found to have some applications in ... more A divergence-free theory with f(R,R_μνR^μν)=2R_μνR^μν-R^2 was found to have some applications in quantum gravity. Although theory doesn't have classical Einstein limits, it has been proven to be formally divergent free and considered to be of interest in constructing theories of quantum gravity. In this work, we generalize the specific form of f(R,R_μνR^μν) theory of gravity by adding the matter fields. In other words, we specify a proper form of the field equations on more general footings for space with matter contents. In order to examine the effects of this generalization, we first derive the equations of motion in the flat FLRW spacetime and examine the behaviors of the solutions by invoking specific forms of the Hubble parameter. We also classify the physical behaviors of the solutions by employing the stability analysis and check the consistency of the model by considering particular cosmological parameters. Then, we use observational data from Supernovae Ia (SNeIa) and b...
The European Physical Journal Special Topics, 2022
In this work, we review the composite dynamics in various models which can be efficiently used to... more In this work, we review the composite dynamics in various models which can be efficiently used to study the mechanism of cosmic inflation. In the framework of single-field inflationary models, we consider the inflaton field emerging as a bound state stemming solely from the underlying fermionic degrees of freedom in various composite theories. Moreover, we constrain the number of e -foldings for composite models of inflation to obtain successful inflation and satisfy the observational data from Planck 2018, simultaneously. In addition, a set of cosmological parameters, e.g., the primordial spectral index $$n_s$$ n s and tensor-to-scalar ratio r , is constrained using the results reported by Planck 2018.
Annalen der Physik, 2022
In this work, we present the possible existence of thermal phase transition between AdS to dS asy... more In this work, we present the possible existence of thermal phase transition between AdS to dS asymptotic geometries in vacuum in the context of novel 4D Einstein-Gauss-Bonnet (EGB) gravity. The phase transition proceeds through the thermalon (the Euclidean sector of the bubble thin-shell) formation having a black hole inside the interior of dS spacetime and a thermal AdS spacetime in the exterior without introducing any matter field. According to our analysis, we find that the gravitational phase transitions using novel 4D EGB gravity always take place for all existences of the 4D EGB coupling. In contrast to 5-dimensional EGB gravity, the existence of phase transition requires a narrow range of the 4D EGB coupling with particular critical values, while the 5-dimension sector has a wider range of its coupling for the existences of the thermalon and there also exist critical values for the emergence of the phase transition.
arXiv: General Relativity and Quantum Cosmology, 2017
In this article we perform a detailed theoretical analysis for a class of new exact solutions wit... more In this article we perform a detailed theoretical analysis for a class of new exact solutions with anisotropic fluid distribution of matter for compact objects in hydrostatic equilibrium. To achieve this we call the relation between the metric functions, namely, embedding class one condition. The investigation is carried out by generalising the properties of a spherical star with an emphasis on hydrostatic equilibrium equation, i.e., the generalised Tolman-Oppenheimer-Volkoff equation, in our understanding of these compact objects. We match the interior solution to an exterior Reissner-Nordstrom solution, and study some physical features of this models, such as the energy conditions, speeds of sound, and mass - radius relation of the star. We also show that obtained solution is compatible with observational data for compact object Her X-1.
arXiv: Quantum Physics, 2018
It is well established that quantum criticality is one of the most intriguing phenomena which sig... more It is well established that quantum criticality is one of the most intriguing phenomena which signals the presence of new states of matter. Without prior knowledge of the local order parameter, the quantum information metric (or fidelity susceptibility) can indicate the presence of a phase transition as well as it measures distance between quantum states. In this work, we calculate distance between quantum states which is equal to the fidelity susceptibility in quantum model for a time-dependent system describing a two-level atom coupled to a time-driven external field. As inspired by the Landau-Lifshitz quantum model, we find in the present work information metric induced by fidelity susceptibility. We for the first time derive a higher-order rank-3 tensor as third-order fidelity susceptibility. Having computed quantum noise function in this simple time-dependent model we show that the noise function eternally lasts long in our model.
arXiv: High Energy Physics - Phenomenology, 2016
We study the details of preheating in an inflationary scenario in which the lightest composite st... more We study the details of preheating in an inflationary scenario in which the lightest composite state stemming from the minimal walking technicolor theory plays the role of the inflaton. For model of inflation, the effective theory couples non-minimally to gravity. We examine a resonant particle production of an additional scalar field coupled minimally to a spacetime curvature as well as to a composite inflaton field. In particular, we find that this process can be characterized by the Mathieu equation. Interestingly, we discover that broad resonances can be typically achieved and potentially efficient in our model.
arXiv: General Relativity and Quantum Cosmology, 2018
In this Letter, we consider original Nash theory of gravity. In terms of the scalar fields repres... more In this Letter, we consider original Nash theory of gravity. In terms of the scalar fields representation, Nash gravity is equivalent to the action of bi-scalar tensor gravity with four derivative terms of metric tensor. We then quantify the ghost in the theory. In order to study the gravitational wave modes of the theory, we perform a small perturbation over a fixed Minkowski background. We discover the standard wave equation and obtain the solutions as those of the standard general relativity. In order to satisfy the GR in the weak field limit, we further modify the original Nash theory by adding the Einstein-Hibert term called modified Nash gravity. In this theory, we once study the gravitational wave modes. We derive equations of motion and examine the solutions. We discover the two-mode solutions: the massless graviton and the massive one. Using a uniform prior probability on the graviton mass, we can constrain mass parameter.
arXiv: General Relativity and Quantum Cosmology, 2020
In this work, we construct traversable wormholes in charged and neutral massive gravity. The shap... more In this work, we construct traversable wormholes in charged and neutral massive gravity. The shape function $b(r)=a_{0} - Q^2\big(1/r-1/a_{0}\big) - \gamma \big(r^2-a^{2}_{0}\big) + \frac{\Lambda}{3}\big(r^3-a^{3}_{0}\big)$ inherently obtained from the underlying massive theory with $a_0, Q, \gamma$ and $\Lambda$ being a wormhole throat, a charge, an arbitrary constant and a cosmological constant, respectively, while the variable redshift function $\Phi=\frac12\ln\left( 1+ p^2/r^2\right)$ is opted with $p$ being an arbitrary constant. Contrary to the asymptotically flat space, this work features the asymptotically dS space with a positive cosmological constant. We find that the shape function $b(r)$ is satisfied with all required properties. More importantly, we observe that the null, weak, and strong energy conditions for the constructed traversable wormholes in massive gravity both charged case and neutral case are satisfied when the traversable wormholes are big enough. Moreover,...
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Papers by Phongpichit Channuie