A5023515747- Pulsars and Gravitational Waves Research
- Molecular Spectroscopy and Structure
- High-pressure geophysics and materials
- Advanced Chemical Physics Studies
- Gamma-ray bursts and supernovae
- Atmospheric Ozone and Climate
- Nuclear physics research studies
- Organic and Inorganic Chemical Reactions
- Spectroscopy and Laser Applications
- Astrophysical Phenomena and Observations
- Geophysics and Gravity Measurements
- High-Energy Particle Collisions Research
- Microwave-Assisted Synthesis and Applications
- Cosmology and Gravitation Theories
- Photochemistry and Electron Transfer Studies
- Inorganic and Organometallic Chemistry
- Quantum Chromodynamics and Particle Interactions
- Quantum, superfluid, helium dynamics
- Superconducting Materials and Applications
- Porphyrin and Phthalocyanine Chemistry
- Synthesis of Organic Compounds
- Radio Astronomy Observations and Technology
- Atomic and Subatomic Physics Research
- Nuclear reactor physics and engineering
- Molecular spectroscopy and chirality
Tata Institute of Fundamental Research
2018-2019
Frankfurt Institute for Advanced Studies
2015-2017
Goethe University Frankfurt
2015
Saha Institute of Nuclear Physics
1990-2013
University of Rochester
1988
University of Kansas
1982-1987
We have studied the effect of tidal deformability constraint given by binary neutron star merger event GW170817 on equations state (EOS) hybrid stars. The EOS are constructed matching hadronic described relativistic mean field (RMF) model and parameter sets NL3, TM1 NL3$\omega\rho$ with quark matter modified MIT bag model, via Gibbs' construction. It is found that constraints along lower bound maximum mass ($M_{\rm max}=2.01\pm0.04M_\odot$) significantly limit space ($B_{\rm eff}^{1/4}$,...
Observations of neutron stars (NSs) by the LIGO-Virgo and NICER collaborations have provided reasonably precise measurements their various macroscopic properties. In this paper, we employ a Bayesian framework to combine them place improved joint constraints on properties NS equation state (EoS). We use hybrid EoS formulation that employs parabolic expansion-based nuclear empirical parameterization around saturation density augmented generic 3-segment piecewise polytrope model at higher...
We show that the odds of mass-gap (secondary) object in GW190814 being a neutron star (NS) improve if one allows for stiff high-density equation state (EoS) or large spin. Since its mass is $\in (2.50,2.67) M_{\odot}$, establishing true nature will make it either heaviest NS lightest black hole (BH), and can have far-reaching implications on EoS compact formation channels. When limiting oneself to hypothesis, we deduce secondary's properties by using Bayesian framework with hybrid...
Radio frequency, microwave, and infrared spectra have been obtained from molecular beams of acetylene dimer. The geometry the isomer studied here is T shaped, with centers mass monomers separated by 4.38 Å. equilibrium structure appears not to C2v symmetry vibrationally averaged has ‘‘top’’ rotated about its center 27°. electric dipole moment this complex 0.28 D.
The first detection of gravitational waves from the binary neutron star merger event GW170817 has started to provide important new constraints on nuclear equation state at high density. tidal deformability bound combined with observed two solar mass poses a serious challenge theoretical formulations realistic equations state. We analyze fully comprehensive set relativistic mean-field theories by confronting them observational bounds and measured neutron-skin thickness. find that only few...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicrowave structures of cyanocyclopropane and cyclopropylacetylene. Effects cyclopropyl .pi. conjugation on structureMarlin D. Harmony, R. N. Nandi, James V. Tietz, Jong-In Choe, Stephen J. Getty, Stuart W. StaleyCite this: Am. Chem. Soc. 1983, 105, 12, 3947–3951Publication Date (Print):June 1, 1983Publication History Published online1 May 2002Published inissue 1 June...
We study the transport properties of nuclear pasta for a wide range density, temperature and proton fractions, relevant different astrophysical scenarios adopting quantum molecular dynamics model. In particular, we estimate values shear viscosity as well electrical thermal conductivities by calculating static structure factor $S(q)$ using simulation data. density where phase appears, shows irregular behavior. The presence slab greatly enhances peak in $S(q)$. However, effect irregularities...
We study the effect of isospin-dependent nuclear forces on pasta phase in inner crust neutron stars. To this end we model within framework quantum molecular dynamics (QMD). For maximizing numerical performance, a newly developed code has been implemented GPU processors. As first application studies investigate dependence particular phases isospin interaction, including non-linear terms sector interactions. Our results indicate that contrast to earlier diagram is not very sensitive effects....
The infrared absorption spectrum of the carbon dioxide–acetylene van der Waals complex has been observed in a pulsed molecular beam. A color center laser was used to excite vibration associated with antisymmetric hydrogen stretching mode acetylene monomer. vibrational origin is 3281.740 cm−1 and rotational constants are A″=8876, B″=2859, C″=2155, A′=8864, B′=2855, C′=2154 MHz. axes two monomer parallel one another C2v symmetry. separation units 3.285 Å. angular part intermolecular potential...
In the late inspiral phase, gravitational waves from binary neutron star mergers carry imprint of equation state due to tidally deformed structure components. If stars contain solid crusts, then their shear modulus can affect deformability and, thereby, modify emitted signal. We investigate effect realistic equations (EOSs) crustal matter, with a model for stellar crust in fully general relativistic framework. This allows us systematically study deviations that are expected fluid models....
We study the properties and stability of nuclei in inner crust neutron stars presence strong magnetic fields $\sim 10^{17}$ G. Nuclei coexist with a gas reside uniform electrons crust. This problem is investigated within Thomas-Fermi model. extract based on subtraction procedure Bonche, Levit Vautherin. The phase space modification due to Landau quantisation leads enhancement electron as well proton fractions at lower densities 0.001$ fm$^{-3}$. find equilibrium nucleus each average baryon...
The abrupt change in the pulse period of a pulsar is called glitch. In this paper, we present eleven glitches detected using Ooty Radio Telescope (ORT) and upgraded Giant Metrewave (uGMRT) high cadence timing observations 8 pulsars. measured relative amplitude ($\Delta \nu/\nu$) from our data ranges $10^{-6}$ to $10^{-9}$. Among these glitches, three are new discoveries, being reported for first time. We also reanalyze largest glitch Crab (PSR J0534+2200) by fitting ORT phenomenological...
We discuss the effects of strong magnetic fields through Landau quantization electrons on structure and stability nuclei in neutron star crust. In fields, this leads to enhancement electron number density with respect zero field case. obtain sequence equilibrium outer crust presence adopting most recent versions experimental theoretical nuclear mass tables. For B ∼ 1016G, it is found that some new appear disappear from compared
In this letter we study the dynamics of a first order phase transition from nucleonic to quark matter in neutron stars. Using standard equations state for these two phases find density range where such is possible. Then transformation star assuming that core formed via spherical shock wave. The thermodynamical conditions are found conservation laws across region. Their dependence on and velocity incoming nuclear studied. It especially violent beginning conversion process when infalling high....
Abstract We examine bulk viscosity, taking into account trapped neutrinos in baryonic matter, the context of binary neutron star mergers. Following merging event, can yield a remnant compact object with densities up to 5 nuclear saturation density and temperature 50 MeV resulting retention neutrinos. employ two relativistic mean field models, NL3 DDME2, describe neutrino-trapped matter. The dissipation coefficient is determined by evaluating Modified URCA interaction rate dense medium,...
The microwave spectrum of 1,2-ethanedithiol has been investigated. Measurements yield rotational constants having values A=9292.451±0.006, B=2239.194±0.002, C=1935.557±0.002 MHz; and dipole moment components μa=0.683±0.011, μb=1.749±0.044, μc=0.774±0.034 D. Analysis these data shows that the molecule adopts an unsymmetrical non-hydrogen-bonded conformation.