arXiv subjects

Manoj Thulasidas

Publications and source records attributed to Manoj Thulasidas.

4 recordsLinked to original sources

arXiv2007

Are Radio Sources and Gamma Ray Bursts Luminal Booms?

The softening of a Gamma Ray Burst (GRB) afterglow bears remarkable similarities to the frequency evolution in a sonic boom. At the front end of the sonic boom cone, the frequency is infinite, much like a GRB. Inside the cone, the frequency rapidly decreases to infrasonic ranges and the sound source appears at two places at the same time, mimicking the double-lobed radio sources. Although a "luminal" boom violates the Lorentz invariance and is therefore forbidden, it is tempting to work out the details and compare them with existing data. This temptation is further enhanced by the observed superluminality in the celestial objects associated with radio sources and some GRBs. In this article, we calculate the temporal and spatial variation of observed frequencies from a hypothetical luminal boom and show remarkable similarity between our calculations and current observations.

astro-ph↗

arXiv2005

Constraints of Perception and Cognition in Relativistic Physics

This article explores the constraints of perception and cognition in relativistic physics. Describing reality as a cognitive representation of our sensory inputs, the article shows how the limitations in perception translate to the properties of space and time in physics. This framework of looking at the visual reality as our brain's representation limited by the speed of light unifies and explains a wide array of seemingly unrelated astrophysical and cosmological phenomena. Understanding the constraints on our space and time due to the limitations in perception and cognitive representation opens the possibility of understanding astrophysics and cosmology from a whole new viewpoint.

physics.gen-ph↗

arXiv2005

A Kinematic Model for Gamma Ray Bursts and Symmetric Jets

Gamma ray bursts (GRB) occur at random points in the sky at cosmological distances. The spectra evolve through X-ray, optical region to possibly radio frequency. Though there are some models, the origin and time evolution of GRB are not well understood. Extragalactic radio sources also exhibit a baffling array of features that are poorly understood -- the core emission in ultraviolet region, lobes in RF range, transient gamma and X-ray emissions etc. These two phenomena appear to be very different, but the time evolution of the core emission of radio sources is essentially the same as GRBs, though with different time constants. Here, we present a model unifying GRB and roughly symmetric radio sources based on light travel time effect and superluminality. An object, moving across our field of vision at superluminal speeds, will appear to us as two objects receding from a single point. The time evolution of the Doppler shifted radiation of such a superluminal object bears remarkable similarity to that of GRB and radio sources. Based on these observations, we derive a kinematic model for radio sources and GRBs and explain the puzzling features listed above. Our model also explains the observed blue/UV spectrum (and its time evolution) of the core region and the RF spectrum of the lobes, and why the radio sources appear to be associated with galactic nuclei.

astro-ph↗

arXiv2004

Kinematics of Extragalactic Radio Sources

Symmetric extragalactic radio sources exhibit a baffling array of features - the remarkable symmetry between the two lobes, the emission in the radio frequency range, well collimated jets, core regions emitting blue and ultraviolet light, transient X-ray and gamma ray bursts, etc. In this article, we present a model for the kinematics of extragalactic radio sources that explains these features. We establish that an apparent superluminal motion in both the jets of these radio sources (galactic or extragalactic) necessarily implies real superluminal motion. The light travel time effect influences the way we perceive superluminal motion. An object, moving across our field of vision at superluminal speeds, will appear to us as two objects receding from a single point. Based on this fact, we derive the kinematical properties of extragalactic radio sources and explain the puzzling features listed above. Furthermore, we derive the time evolution of the hot spots and compare it to the proper motions reported in the literature. This model can also explain the observed blue/UV spectrum (and its time evolution) of the core region and the RF spectrum of the lobes, and why the radio sources appear to be associated with galactic nuclei. We make other quantitative predictions, which can be verified.

astro-ph↗