Gravitational waves from isolated neutron stars: Mass dependence of 
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-mode instability

Mukhopadhyay, S.; Lahiri, Joydev; Atta, Debasis; Imam, Kouser; Basu, Debabrata

doi:10.1103/physrevc.97.065804

Cited by 16 publications

(11 citation statements)

References 94 publications

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“…[30] In FT-IR spectra, the peaks in the region between 500 and 700 cm −1 are attributed to metal-oxygen vibration. In this study, copper oxide nanoparticle formation is confirmed by the presence of peaks at 569 cm −1 for the bending vibration of Cu(II)-O [31,32] and at 621 cm − 1 for the bending vibration of Cu(I)-O. [33] The concurrent biosynthesis of CuO NPs and Cu 2 O NPs using plant extracts has already been reported.…”

Section: Chemical Characterization Of Cu Npssupporting

confidence: 64%

Application of copper nanoparticles containing natural compounds in the treatment of bacterial and fungal diseases

Hemmati

Kamangar

Ahmeda

et al. 2020

Applied Organom Chemis

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The development of nanotechnology has generated different nanoscale‐sized materials, with metal‐based nanomaterials being some of the most interesting and promising. Thousands of articles in various specialized journals all over the world are dedicated to different metallic nanomaterials. Metallic nanomaterials are being widely researched, with gold‐, silver‐, iron‐, and copper‐based materials showing potential in medicine. Studies have demonstrated the effect of copper nanoparticles in medicinal herbs on the prevention, control, and treatment of microbial diseases. Experiments have examined the chemical characterization and assessment of the antioxidant, cytotoxicity, antibacterial, and antifungal activities of copper nanoparticles (Cu NPs) using the aqueous extract of Stachys lavandulifolia Vahl flower. These nanoparticles were characterized by UV–visible spectroscopy, field emission scanning electron microscopy (FE‐SEM), energy dispersive X‐ray spectroscopy, transmission electron microscopy (TEM), Fourier‐transform infrared spectroscopy (FT‐IR), and X‐ray diffraction analysis. TEM and FE‐SEM images exhibited a uniform spherical morphology and diameters of 10–25 nm for the biosynthesized nanoparticles. FT‐IR results suggested polysaccharides and protein in S. lavandulifolia acted as reducing agents, reducing copper ions to Cu NPs. In vitro biological experiments indicated that Cu NPs have excellent antioxidant potential against 2,2‐diphenyl‐1‐picrylhydrazyl, antifungal effects against Candida krusei, Candida parapsilosis, Candida guilliermondii, Candida glabrata, and Candida albicans, and antibacterial activities against Staphylococcus aureus, Enterococcus faecalis, Staphylococcus saprophyticus, Bacillus subtilis, Streptococcus pneumonia, Escherichia coli O157:H7, Salmonella typhimurium, Listeria monocytogenes, Proteus mirabilis, and Pseudomonas aeruginosa. These nanoparticles did not have cytotoxicity properties against human umbilical vein endothelial cells. These results indicate that the inclusion of S. lavandulifolia extract ameliorates the solubility of Cu NPs, which leads to a remarkable enhancement in fungicidal and bactericidal effects under in vitro conditions.

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Section: Chemical Characterization Of Cu Npssupporting

confidence: 64%

Application of copper nanoparticles containing natural compounds in the treatment of bacterial and fungal diseases

Hemmati

Kamangar

Ahmeda

et al. 2020

Applied Organom Chemis

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“…This fact is highlighted in Fig. 1, where the spin frequencies and core temperatures of observed low-mass x-ray binaries and millisecond radio pulsars [15] always lie below the region of r-mode T (10 8 K) instability [16]. The gap in the graphs is due to the fact that when the temperature T ≤ 10 9 K, the shear viscosity is due to electron-electron scattering (Eq.…”

Section: Theoretical Calculations and Resultsmentioning

confidence: 90%

Effect of the DDM3Y Nuclear Equation of State on the R-mode Instability of Neutron Stars

Atta

Mukhopadhyay

Basu

2020

Proceedings of 13th International Conference on Nucleus-Nucleus Collisions

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The r-mode instability windows of neutron stars in the slow rotation approximation are explored using the equation of state obtained from the density dependent M3Y effective interaction. We consider the neutron star matter to be β-equilibrated neutron-proton-electron matter at the core with a rigid crust. The critical frequencies as functions of temperature are calculated for a wide range of neutron star masses. We conclude that the young and hot rotating neutron stars lie in the r-mode instability region. We also stress on the fact that if the dominant dissipative mechanism of the r-mode is the shear viscosity along the boundary layer of the crust-core interface, then the neutron stars with low value of slope of symmetry energy L lie in the r-mode instability region and hence emit gravitational radiation.

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“…If we solve Schrödinger's equation with zcomponent of spin angular momentum s z in a constant and uniform magnetic field in z-direction, then Eq. (31) modifies to…”

Section: Landau Quantization and Equation Of State For Magnetized Whi...mentioning

confidence: 99%

“…The reduced critical frequencies are lower for heavier white dwarfs at the same temperature and magnetic field. This is because of the fact that the ratios | τ GR |/ τ M and | τ GR |/τ SV rapidly decrease with increase in mass (31). For the same magnetic field and mass, Ω c /Ω 0 ∝ T −1/3 .…”

Section: Critical Frequencies Spindown and Spindown Rates Of Sub-and ...mentioning

confidence: 99%

Gravitational waves from r-mode instability of massive young sub- and super-Chandrasekhar white dwarfs

Mukhopadhyay,

Banik

2020

Preprint

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In the present work we investigate the rmode instability windows, spindown and spindown rates of sub-and super-Chandrasekhar magnetized white dwarfs in presence of Landau quantization of the electron gas and magnetic braking. The gravitational wave strain amplitudes due to r-mode instability is also calculated. The dominant damping mechanism is taken to be the shear viscosity arising due to scattering of the degenerate electrons from the ion liquid. We find that the critical frequencies of Landau quantized magnetized white dwarfs are the lowest, those of non-Landau quantized ones are higher and those of non-magnetized ones are the highest at the same temperature. This implies that magnetic braking and Landau quantization both enhance r-mode instability. We have also seen that there is rapid spindown of magnetized white dwarfs due to additional magnetic braking term but there is no considerable effect of Landau quantization on the spindown and spindown rates for magnetic field strengths relevant for white dwarf interiors. We find that the rmode gravitational wave strain amplitude for a rapidly rotating super-Chandrasekhar white dwarf at 1 kpc is ∼ 10 −27 , making isolated massive rapidly rotating hot magnetized white dwarfs prime candidates for search of gravitational waves in the future.

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Gravitational waves from isolated neutron stars: Mass dependence of r -mode instability

Cited by 16 publications

References 94 publications

Application of copper nanoparticles containing natural compounds in the treatment of bacterial and fungal diseases

Application of copper nanoparticles containing natural compounds in the treatment of bacterial and fungal diseases

Effect of the DDM3Y Nuclear Equation of State on the R-mode Instability of Neutron Stars

Gravitational waves from r-mode instability of massive young sub- and super-Chandrasekhar white dwarfs

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