61 citations · 411 across the 25 of their papers we have counts for
26 papers
More on Emergent Dark Energy from Unparticles
Michał Artymowski, Ido Ben-Dayan, Utkarsh Kumar
In a recent paper \cite{Artymowski:2020zwy} we suggested the possibility that the present acceleration of the Universe is due to thermodynamical behavior of unparticles. The model…
Sourced fluctuations in generic slow contraction
Michał Artymowski, Ido Ben-Dayan, Udaykrishna Thattarampilly
We introduce a set of generic conditions for the slow contracting Universe and for a narrowed-down category of models called fast-roll models. We present general conditions for sup…
Emergent dark energy from unparticles
Michal Artymowski, Ido Ben-Dayan, Utkarsh Kumar
A limiting temperature of a species can cause the Universe to asymptote to it yielding a deSitter (dS) phase due to macroscopic emergent behavior. The limiting temperature is gener…
Banks-Zaks Cosmology, Inflation, and the Big Bang Singularity
Michal Artymowski, Ido Ben-Dayan, Utkarsh Kumar
We consider the thermodynamical behavior of Banks-Zaks theory close to the conformal point in a cosmological setting. Due to the anomalous dimension, the resulting pressure and ene…
Inflation in supergravity from field redefinitions
Michal Artymowski, Ido Ben-Dayan
Supergravity (SUGRA) theories are specified by a few functions, most notably the real Kähler function denoted by , where K is a real Kähler pot…
Constant roll warm inflation in high dissipative regime
Vahid Kamali, Michał Artymowski, Mohammad Reza Setare
Constant-roll warm inflation is introduced in this work. A novel approach to finding an exact solution for Friedman equations coupled to scalar field equation of motion is presente…
f(R) and Brans-Dicke Theories and the Swampland
Michal Artymowski, Ido Ben-Dayan
We discuss the viability of and Brans-Dicke theories of gravity in light of the recent Swampland conjectures. We show that in the case of perfect fluid domination the swampl…
Hill-climbing dark inflation
Michal Artymowski, Zygmunt Lalak, Kin-Ya Oda
Within the framework of the scalar-tensor theory we consider a hill-climbing inflation, in which the effective Planck mass increases in time. We obtain the Einstein frame potential…
Quantum Hubble horizon
Michal Artymowski, Jakub Mielczarek
The article addresses a possibility of obtaining cosmologically relevant effects from the quantum nature of the Hubble horizon. Following the observation made by E.~Bianchi and C.~…
New parameterization for unified dark matter and dark energy
Zahra Davari, Mohammad Malekjani, Michal Artymowski
In this paper we investigate a new phenomenological parameterization for unified dark matter and dark energy based on the polynomial expansion of the barotropic equation of state p…
Gravitational wave signals and cosmological consequences of gravitational reheating
Michał Artymowski, Olga Czerwińska, Zygmunt Lalak +1
Reheating after inflation can proceed even if the inflaton couples to Standard Model (SM) particles only gravitationally. However, particle production during the transition between…
Gravitational wave and collider implications of electroweak baryogenesis aided by non-standard cosmology
Michał Artymowski, Marek Lewicki, James D. Wells
We consider various models realizing baryogenesis during the electroweak phase transition (EWBG). Our focus is their possible detection in future collider experiments and possible…
Scalar-tensor linear inflation
Michal Artymowski, Antonio Racioppi
We investigate two approaches to non minimally coupled gravity theories which present linear inflation as attractor solution: a) the scalar-tensor theory approach, where we look fo…
Initial conditions for inflation
Konstantinos Dimopoulos, Michal Artymowski
Within the -attractors framework we investigate scalar potentials with the same pole as the one featured in the kinetic term. We show that, in field space, this leads to directi…
Multi-phase induced inflation in theories with non-minimal coupling to gravity
Michal Artymowski, Zygmunt Lalak, Marek Lewicki
In this paper we investigate the induced inflation with two flat regions: one Starobinsky-like plateau in big field regime and one shorter plateau around the saddle point of the Ei…
Endlessly flat scalar potentials and -attractors
Michal Artymowski, Javier Rubio
We consider a minimally-coupled inflationary theory with a general scalar potential containing a stationary point of maximal order . We show…
Implications of extreme flatness in a general f(R) theory
Michal Artymowski, Zygmunt Lalak, Marek Lewicki
We discuss a modified gravity theory defined by . We consider both finite and infinite number of terms in the series while requiring that th…
Inflation and dark energy from gravity
Michal Artymowski, Zygmunt Lalak, Marek Lewicki
Inflationary paradigm has several issues, such as the pre-inflationary horizon problem or the eternal inflation. To avoid that the standard Starobinsky inflation has been extended…
Saddle point inflation from higher order corrections to Higgs/Starobinsky inflation
Michal Artymowski, Zygmunt Lalak, Marek Lewicki
We explore two saddle point inflationary scenarios in the context of higher order corrections related to different generalisations of general relativity. Firstly, we deal with Jord…
Saddle point inflation from theory
Michal Artymowski, Zygmunt Lalak, Marek Lewicki
We analyse several saddle point inflationary scenarios based on power-law models. We investigate inflation resulting from $f(R) = R + α_n M^{2(1-n)}R^n + α_{n+1}M^{-2n}R^{n+…
A comparison between Jordan and Einstein frames of Brans-Dicke gravity a la loop quantum cosmology
Michal Artymowski, Yonnge Ma, Xiangdong Zhang
It is well known that the Jordan and Einstein frames are equivalent to each other in classical Brans-Dicke theory, provided that one and the same metric is employed for the physica…
Loop quantum cosmology for nonminimally coupled scalar field
Michal Artymowski, Andrea Dapor, Tomasz Pawlowski
We perform a LQC-quantization of the FRW cosmological model with nonminimally coupled scalar field. Making use of a canonical transformation, we recast the theory in the minimally…
Loop quantum Brans-Dicke cosmology
Xiangdong Zhang, Michal Artymowski, Yongge Ma
The spatially flat and isotropic cosmological model of Brans-Dicke theory with coupling parameter is quantized by the approach of loop quantum cosmology. An interesting…
Inflation from non-minimally coupled scalar field in loop quantum cosmology
Michal Artymowski, Andrea Dapor, Tomasz Pawlowski
The FRW model with non-minimally coupled massive scalar field has been investigated in LQC framework. Considered form of the potential and coupling allows applications to Higgs dri…