Papers by Narayanankutty Karuppath
Astrophysics and Space Science, 2018
We present a multi-wavelength correlation study of diffuse ultraviolet radiation using GALEX obse... more We present a multi-wavelength correlation study of diffuse ultraviolet radiation using GALEX observations towards the Aquila Rift. Apart from airglow and zodiacal emissions, we find a diffuse background of 1300-3700 ph cm −2 s −1 sr −1Å−1 in the far-ultraviolet (FUV: 1350-1750Å) band and 1300-2800 ph cm −2 s −1 sr −1Å−1 in the near-ultraviolet (NUV: 1750-2850Å) band. The observed diffuse UV emissions are saturated with total as well as neutral hydrogen column density in the region due to high optical depth in UV (τ : 0.91-23.38). Higher values of FUV/NUV ratio in the region, greater than the threshold value of 0.6, along with the positive correlation between the ratio and FUV intensity are due to excess emission in the FUV band which is absent in the NUV band. We estimated the excess emission to be in the range ∼ 400-2700 ph cm −2 s −1 sr −1Å−1 , plausibly due to H 2 fluorescence, ion line emissions and two-photon continuum emissions from the region in the FUV band, which also shows saturation in optically thick regions with N(H 2) as well as Hα emissions. Since N(H 2) and Hα emissions spread all over the region, the excess emission from the field is composite in nature and a detailed spectroscopic analysis is needed to disentangle the contribution from individual components.
Monthly Notices of the Royal Astronomical Society, 2016
We present an analysis of the diffuse ultraviolet (UV) emission near the Taurus Molecular Cloud b... more We present an analysis of the diffuse ultraviolet (UV) emission near the Taurus Molecular Cloud based on observations made by the Galaxy Evolution Explorer (GALEX). We used a Monte Carlo dust scattering model to show that about half of the scattered flux originates in the molecular cloud with 25% arising in the foreground and 25% behind the cloud. The best-fit albedo of the dust grains is 0.3 but the geometry is such that we could not constrain the phase function asymmetry factor (g).
Monthly Notices of the Royal Astronomical Society, 2015
We present an analysis of the diffuse ultraviolet (UV) background in a low latitude region near t... more We present an analysis of the diffuse ultraviolet (UV) background in a low latitude region near the Aquila Rift based on observations made by the Galaxy Evolution Explorer (GALEX). The UV background is at a level of about 2000 ph cm −2 s −1 sr −1 Å −1 with no correlation with either the Galactic latitude or the 100 µm infrared (IR) emission. Rather, the UV emission falls off with distance from the bright B2 star HIP 88149, which is in the centre of the field. We have used a Monte Carlo model to derive an albedo of 0.6-0.7 in the UV with a phase function asymmetry factor (g) of 0.2-0.4. The value for the albedo is dependent on the dust distribution while g is determined by the extent of the halo.
Electronic Notes in Discrete Mathematics, 2009
... 2 Email: karuppath.gmail.com 3 Email: [email protected] P. Achuthan, N. Kar... more ... 2 Email: karuppath.gmail.com 3 Email: [email protected] P. Achuthan, N. Karuppath / Electronic Notes in Discrete Mathematics 33 (2009) 43 5044 We have inelastic scattering, when final, outgoing particles are di erent from ingoing ... [3] Deo Narsingh, Graph ...
Concepts, Methodologies, Tools, and Applications
arXiv: General Physics, 2009
The notion of Non-Locality (NL) in physics has great epistemological implications and impact on t... more The notion of Non-Locality (NL) in physics has great epistemological implications and impact on the perceptive of Reality. Numerous counter intuitive experimental results that clearly violate Bell's inequality have prompted several physicists to believe in 'mysterious' non-local correlations particularly in quantum systems of EPR type. Not commenting much on whether NL is true or not, our contention is that NL, in general, leads to the concept of holistic universe and further to a global concept of 'Consciousness-Centered-Cosmos' (CCC) as almost inevitable rational outcome. These suggestions though ostensibly unorthodox, are rather within rational and legitimate frame work of science. Our reasoning is quite distinct from the erstwhile doctrine of the role of consciousness in the measurement problem and state vector reduction although the latter may add further credence to the our contention. We address particularly the implications NL and discuss certain related ...
Duality in quantum mechanical wave functions is manifest through the famous measurement problem. ... more Duality in quantum mechanical wave functions is manifest through the famous measurement problem. There have been several interpretations to explain this duality, but none have seen full consensus among physicists. The Copenhagen interpretation, which is at least to some extent the most widely accepted interpretation has the ’collapse’ of the wave function (or state vector reduction) during measurement, does not attribute a physical reality to the wave function. Moreover, the idea of measurement having a role in defining reality shakes the very foundation of classical physics. On the other hand, the Many worlds interpretation proposed by Everett is a very brave attempt to attribute physical significance to the wave function. Though mathematically sound and elegant, ’the splitting of the universe’ in the Many Worlds Interpretation completely redefines reality as we know it. We test Everett’s original thought experiment in the presence of a super observer and for sequential measurement...
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Papers by Narayanankutty Karuppath