Zobrazeno 1 - 10
of 362
pro vyhledávání: '"Nikodem J"'
Autor:
Nikodem J. Popławski
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 79, Iss 9, Pp 1-3 (2019)
Abstract The measurements of the Hubble parameter using the cosmic microwave background radiation appear to be inconsistent with the measurements of this parameter using Cepheid variable stars. This inconsistency may be a result of using the $$\Lambd
Externí odkaz:
https://doaj.org/article/655ec8ac7a3a4da080147eb307389333
Autor:
Shantanu Desai, Nikodem J. Popławski
Publikováno v:
Physics Letters B, Vol 755, Iss , Pp 183-189 (2016)
The coupling between spin and torsion in the Einstein–Cartan–Sciama–Kibble theory of gravity generates gravitational repulsion at very high densities, which prevents a singularity in a black hole and may create there a new universe. We show tha
Externí odkaz:
https://doaj.org/article/3f92ed459a49411c9452ecce54b229d4
Autor:
Nikodem J Poplawski, Abbas Shirinifard, Ubirajara Agero, J Scott Gens, Maciej Swat, James A Glazier
Publikováno v:
PLoS ONE, Vol 5, Iss 5, p e10641 (2010)
We use the Glazier-Graner-Hogeweg model to simulate three-dimensional (3D), single-phenotype, avascular tumors growing in an homogeneous tissue matrix (TM) supplying a single limiting nutrient. We study the effects of two parameters on tumor morpholo
Externí odkaz:
https://doaj.org/article/3bb657c5e84b4a49bd1247d8db9f10c5
Autor:
Abbas Shirinifard, J Scott Gens, Benjamin L Zaitlen, Nikodem J Popławski, Maciej Swat, James A Glazier
Publikováno v:
PLoS ONE, Vol 4, Iss 10, p e7190 (2009)
We present a 3D multi-cell simulation of a generic simplification of vascular tumor growth which can be easily extended and adapted to describe more specific vascular tumor types and host tissues. Initially, tumor cells proliferate as they take up th
Externí odkaz:
https://doaj.org/article/8a0b88616fc840fea6ac27cfdf8f80ae
Autor:
Popławski, Nikodem J.
We consider a hypothesis that the closed Universe was formed on the other side of the event horizon of a black hole existing in another universe. That black hole appears in the Universe as a boundary white hole, and its rest frame in comoving coordin
Externí odkaz:
http://arxiv.org/abs/1912.02173
Publikováno v:
Class. Quantum Grav. 37, 025011 (2020)
We analyze the dynamics of a homogeneous and isotropic universe in the Einstein--Cartan theory of gravity. The spin of fermions produces spacetime torsion that prevents gravitational singularities and replaces the big bang with a nonsingular big boun
Externí odkaz:
http://arxiv.org/abs/1906.11824
Autor:
Popławski, Nikodem J.
Publikováno v:
Eur. Phys. J. C 79, 734 (2019)
The measurements of the Hubble parameter using the cosmic microwave background radiation appear to be inconsistent with the measurements of this parameter using Cepheid variable stars. This inconsistency may be a result of using the $\Lambda$CDM cosm
Externí odkaz:
http://arxiv.org/abs/1906.03947
Autor:
Popławski, Nikodem J.
Publikováno v:
Mod. Phys. Lett. A 35, 2050331 (2020)
We show that a scalar field without a kinetic term in the Lagrangian density, coupled to the covariant divergence of the torsion vector in the Einstein$-$Cartan theory of gravity, becomes kinetic in its general-relativistic equivalent formulation. Th
Externí odkaz:
http://arxiv.org/abs/1512.09365
Autor:
Desai, Shantanu, Poplawski, Nikodem J.
Publikováno v:
Phys. Lett. B 755, 183 (2016)
The coupling between spin and torsion in the Einstein-Cartan-Sciama-Kibble theory of gravity generates gravitational repulsion at very high densities, which prevents a singularity in a black hole and may create there a new universe. We show that quan
Externí odkaz:
http://arxiv.org/abs/1510.08834
Autor:
Poplawski, Nikodem J.
Publikováno v:
Astrophys. J. 832, 96 (2016)
The conservation law for the angular momentum in curved spacetime requires that the antisymmetric part of the affine connection (the torsion tensor) is a variable in the principle of least action. The coupling between spin and torsion generates gravi
Externí odkaz:
http://arxiv.org/abs/1410.3881