Zobrazeno 1 - 10
of 1 108
pro vyhledávání: '"SINGAL, P. K."'
Autor:
Singal, Ashok K.
Publikováno v:
MNRAS 532, L1 (2024)
Sky distributions of large samples of distant active galactic nuclei (AGNs) have shown dipoles significantly larger than the cosmic microwave background (CMB) dipole. However, a recent Bayesian analysis of the QUAIA sample, comprising 1.3 million qua
Externí odkaz:
http://arxiv.org/abs/2403.16581
Autor:
Singal, Ashok K.
Publikováno v:
Eur. J. Phys. 45, 065202 (2024)
The electromagnetic energy-momentum of a moving charged spherical capacitor may be calculated by a 4-vector Lorentz transformation from the energy in the rest frame. However, energy-momentum of the moving system computed directly from electromagnetic
Externí odkaz:
http://arxiv.org/abs/2402.14884
Autor:
Singal, Ashok K.
Publikováno v:
MNRAS 528, 5679 (2024)
We investigate dipole asymmetries in four large radio surveys, each spanning more than 80\% of the sky. Two of them, the Very Large Array Sky Survey (VLASS) and the Rapid ASKAP Continuum Survey (RACS), have recently yielded dipoles that appear incong
Externí odkaz:
http://arxiv.org/abs/2312.12785
Autor:
Singal, Ashok K.
Publikováno v:
J. Phys. Commun. 7, 065005 (2023)
It is well known that the light-ray trajectories follow a curved path in a gravitational field. This has been confirmed observationally where light rays coming from distant astronomical objects are seen to get bent in Sun's gravitational field. We ex
Externí odkaz:
http://arxiv.org/abs/2306.16423
Discordance of dipole asymmetries seen in recent large radio surveys with the Cosmological Principle
Autor:
Singal, Ashok K.
Publikováno v:
MNRAS, 524, 3636 (2023)
In recent years, large radio surveys of Active Galactic Nuclei (AGNs), comprising millions of sources, have become available where one could investigate dipole asymmetries, assumedly arising due to a peculiar motion of the Solar system. Investigation
Externí odkaz:
http://arxiv.org/abs/2303.05141
Autor:
Singal, Ashok K.
In the Aharonov-Bohm setup, a double-slit experiment, coherent beams of electrons passing through two slits form an interference pattern on the observing screen. However, when a long but thin solenoid of current is introduced behind the slits between
Externí odkaz:
http://arxiv.org/abs/2301.06502
Autor:
Aluri, Pavan Kumar, Cea, Paolo, Chingangbam, Pravabati, Chu, Ming-Chung, Clowes, Roger G., Hutsemékers, Damien, Kochappan, Joby P., Lopez, Alexia M., Liu, Lang, Martens, Niels C. M., Martins, C. J. A. P., Migkas, Konstantinos, Colgáin, Eoin Ó, Pranav, Pratyush, Shamir, Lior, Singal, Ashok K., Sheikh-Jabbari, M. M., Wagner, Jenny, Wang, Shao-Jiang, Wiltshire, David L., Yeung, Shek, Yin, Lu, Zhao, Wen
Publikováno v:
Classical and Quantum Gravity, Vol. 40, Issue No. 9, Page No. 094001 (2023)
The Cosmological Principle (CP) -- the notion that the Universe is spatially isotropic and homogeneous on large scales -- underlies a century of progress in cosmology. It is conventionally formulated through the Friedmann-Lema\^itre-Robertson-Walker
Externí odkaz:
http://arxiv.org/abs/2207.05765
Autor:
Singal, Ashok K.
In moving electromagnetic systems, electromagnetic momentum calculated from the vector potential is shown to be proportional to the field energy of the system. The momentum thus obtained is shown actually to be the same as derived from a Lorentz tran
Externí odkaz:
http://arxiv.org/abs/2206.00431
Autor:
Singal, Ashok K.
Publikováno v:
Mon. Not. R. astr. Soc., 511, 1819-1829, 2022
We determine here peculiar motion of the Solar system, first time from the $m-z$ Hubble diagram of quasars. Observer's peculiar motion causes a systematic shift in the $m-z$ plane between sources lying along the velocity vector and those in the oppos
Externí odkaz:
http://arxiv.org/abs/2107.09390
Autor:
Singal, Ashok K.
Publikováno v:
MNRAS 515, 5969 (2022)
Peculiar motion of the solar system, determined from the dipole anisotropy in the Cosmic Microwave Background Radiation (CMBR), has given a velocity $370$ km s$^{-1}$ along RA$=168^{\circ}$, Dec$=-7^{\circ}$. Subsequent peculiar motion determinations
Externí odkaz:
http://arxiv.org/abs/2106.11968