Results 1 to 10 of about 982 (118)
Galaxy rotation curves via conformal factors [PDF]
European Physical Journal C: Particles and Fields, 2018 We propose a new formula to explain circular velocity profiles of spiral galaxies obtained from the Starobinsky model in the Palatini formalism. It is based on the assumption that the gravity can be described by two conformally related metrics: one of ...
Ciprian A. Sporea +2 more
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A Simple Model for Explaining Galaxy Rotation Curves
Galaxies, 2018 A new simple expression for the circular velocity of spiral galaxies is proposed and tested against HI Nearby Galaxy Survey (THINGS) data set. Its accuracy is compared with the one coming from MOND.
Aneta Wojnar +2 more
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Dark matter fluid constraints from galaxy rotation curves
European Physical Journal C: Particles and Fields, 2023 Galaxy rotation curves are considered to be convincing evidence for dark matter or some dynamically equivalent alternative mechanism. Starting only from the rotation curve data, we present a model independent approach of testing a general hypothesis that
Dalibor Perković, Hrvoje Štefančić
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Galaxy Rotation Curves in Covariant Hořava-Lifshitz Gravity
Galaxies, 2013 Using the multiplicity of solutions for the projectable case of the covariant extension of Hořava-Lifshitz gravity, we show that an appropriate choice for the auxiliary field allows for an effective description of galaxy rotation curves. This description
Jean Alexandre, Martyna Kostacinska
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Influence of Magnetic Fields on the Gas Rotation in the Galaxy NGC 6946
The Astrophysical Journal, 2023 Magnetic fields can play an important role in the energy balance and formation of gas structures in galaxies. However, their dynamical effect on the rotation curve of galaxies is immensely unexplored.
M. Khademi, S. Nasiri, F. S. Tabatabaei
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The Effects of Inertial Forces on the Dynamics of Disk Galaxies
Galaxies, 2021 When dealing with galactic dynamics, or more specifically, with galactic rotation curves, one basic assumption is always taken: the frame of reference relative to which the rotational velocities are given is assumed to be inertial.
Roy Gomel, Tomer Zimmerman
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Gravitational potential and galaxy rotation curves in multi-fractional spacetimes
Journal of High Energy Physics, 2022 Multi-fractional theories with integer-order derivatives are models of gravitational and matter fields living in spacetimes with variable Hausdorff and spectral dimension, originally proposed as descriptions of geometries arising in quantum gravity.
Gianluca Calcagni, Gabriele U. Varieschi
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On the Dwarf Galaxy Rotation Curve Diversity Problem
Galaxies, 2018 In this paper, we show how baryonic physics can solve the problem of the striking diversity in dwarf galaxy rotation curves shapes. To this aim, we compare the distribution of galaxies of the SPARC sample, in the plane V2kpc-VRlast (V2kpc being the ...
Antonino Del Popolo +2 more
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The Astronomical Journal, 2023 We report VLA B-configuration observations of the H i 21 cm line on the close disk galaxy pair NGC 5595 and NGC 5597. At the angular resolution of the observations, ∼7.″1 × 4.″2, while most of the H i 21 cm in NGC 5595 and NGC 5597 has the same extent as
J. Antonio Garcia-Barreto +1 more
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Galactic rotation dynamics in a new $$f({\mathcal {R}})$$ f ( R ) gravity model
European Physical Journal C: Particles and Fields, 2023 We propose to test the viability of the recently introduced $$f(\mathcal {R})$$ f ( R ) gravity model in the galactic scales. For this purpose we consider test particles moving in stable circular orbits around the galactic center.
Nashiba Parbin, Umananda Dev Goswami
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