Zobrazeno 1 - 10
of 81
pro vyhledávání: '"Artymowski, Michał"'
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 is free of scalar fields, modified gravity, a Cosmological Constant (C
Externí odkaz:
http://arxiv.org/abs/2111.09946
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 super horizon freeze-out of scalar and tensor perturbations and show that
Externí odkaz:
http://arxiv.org/abs/2011.00626
Publikováno v:
Phys. Rev. D 103, 121303 (2021)
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 generic for theories slightly shifted from their conformal point. We demons
Externí odkaz:
http://arxiv.org/abs/2010.02998
Publikováno v:
JCAP05(2020)015
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 energy density deviate from that of radiation and result in various inter
Externí odkaz:
http://arxiv.org/abs/1912.10532
Autor:
Artymowski, Michal, Ben-Dayan, Ido
Publikováno v:
Symmetry 2020, 12(5), 806
Supergravity (SUGRA) theories are specified by a few functions, most notably the real K\"ahler function denoted by $G(T_i, \bar {T}_i) = K + \log |W|^2$, where K is a real K\"ahler potential, and W is a holomorphic superpotential. A field redefinitio
Externí odkaz:
http://arxiv.org/abs/1908.07052
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 presented for cold inflation and is extended to warm inflation with the consta
Externí odkaz:
http://arxiv.org/abs/1905.04814
Autor:
Artymowski, Michal, Ben-Dayan, Ido
We discuss the viability of $f(R)$ and Brans-Dicke theories of gravity in light of the recent Swampland conjectures. We show that in the case of perfect fluid domination the swampland conjecture conditions may be easily satisfied and therefore we foc
Externí odkaz:
http://arxiv.org/abs/1902.02849
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 with infinitely long and flat plateau as we approach towards the stro
Externí odkaz:
http://arxiv.org/abs/1807.06830
Autor:
Artymowski, Michal, Mielczarek, Jakub
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.~Rovelli in Phys.\ Rev.\ D {\bf 84} (2011) 027502 we explore relationsh
Externí odkaz:
http://arxiv.org/abs/1806.03924
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 parameter $w$. Our parameterization provides well-behaving evolution of
Externí odkaz:
http://arxiv.org/abs/1805.11033