Zobrazeno 1 - 10
of 237
pro vyhledávání: '"Nowakowski, Marek"'
The recent fit of cosmological parameters by the Dark Energy Spectroscopic Instrument (DESI) collaboration will have a significant impact on our understanding of the universe. Given its importance, we conduct several consistency checks and draw concl
Externí odkaz:
http://arxiv.org/abs/2409.19577
Publikováno v:
Ann. Phys., 469, 169773 (2024)
We set up the Wheeler-DeWitt (WDW) equation for late gravitational collapse. The fact that the gravitational collapse and the expanding/ collapsing universe can be described within the realm of the Robertson-Walker metric renders the corresponding WD
Externí odkaz:
http://arxiv.org/abs/2409.05077
Publikováno v:
Physica Scripta, Volume 99, Issue 6, id.065050, 2024
Among the recent extensions to standard General Relativity, $f(R,\mathcal{L}_m)$ gravity has risen an interest given the possibility of coupling between geometry and matter. We examine the simplest model with non-minimal coupling in the context of co
Externí odkaz:
http://arxiv.org/abs/2408.00580
Publikováno v:
Reviews in Physics Reviews in Physics 10, 100084 (2023)
Scalar, vector and tensor conserved quantities are essential tools in solving different problems in physics and complex, nonlinear differential equations in mathematics. In many guises they enter our understanding of nature: charge, lepton, baryon nu
Externí odkaz:
http://arxiv.org/abs/2305.04229
Autor:
Batic, Davide, Nowakowski, Marek
Publikováno v:
Mathematical Methods in the Applied Sciences (2023), 1-17
We introduce a new approach to the the asymptotic iteration method (AIM) by means of which we establish the standard AIM connection with the continued fractions technique and we develop a novel termination condition in terms of the approximants. With
Externí odkaz:
http://arxiv.org/abs/2303.03262
Super-Chandrasekhar white dwarfs are a timely topic in the last years in the scientific community due to its connection to supernovae type Ia (SN Ia). Some early studies tackled the possibility of white dwarfs surpassing the Chandrasekhar limit by me
Externí odkaz:
http://arxiv.org/abs/2303.03243
Publikováno v:
The European Physical Journal C volume 82, Article number: 759 (2022)
Dark Matter (DM) is usually studied in connection with rotational curves in the outskirts of the galaxies. However, the role of DM might be different in the galactic bulges and centers where Supermassive Black Holes (SMBHs) dominate the gravitational
Externí odkaz:
http://arxiv.org/abs/2209.02330
Publikováno v:
Entropy 2022, 24(8), 1083
In view of a result recently published in the context of deformation theory of linear Hamiltonian systems, we reconsider the eigenvalue problem associated to the angular equation arising after the separation of the Dirac equation in the Kerr metric a
Externí odkaz:
http://arxiv.org/abs/2208.05730
Publikováno v:
Scientific Reports 12, 9688 (2022)
We reconsider the case of the geodesic motion of a massive and massless beam of test particles in a gravitational wave. In particular, we use a direct Lagrangian approach which simplifies the calculation. Our findings differ partly from previously pe
Externí odkaz:
http://arxiv.org/abs/2206.07603
Publikováno v:
Annals of Physics, 436, 168727 (2022)
The quest to understand better the nature of the initial cosmological singularity is with us since the discovery of the expanding universe. Here, we propose several non-flat models, among them the standard cosmological scenario with a critical cosmol
Externí odkaz:
http://arxiv.org/abs/2112.13042