A. Singhal
A5002557387- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Geophysics and Gravity Measurements
- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Neutrino Physics Research
- Cosmology and Gravitation Theories
- Atomic and Subatomic Physics Research
- Dark Matter and Cosmic Phenomena
- Statistical and numerical algorithms
- Seismic Waves and Analysis
- Geophysics and Sensor Technology
- High-pressure geophysics and materials
- Radio Astronomy Observations and Technology
- Particle physics theoretical and experimental studies
- Astronomical Observations and Instrumentation
- earthquake and tectonic studies
- Atmospheric Ozone and Climate
- Computational Physics and Python Applications
- Magnetic confinement fusion research
- Seismology and Earthquake Studies
- Superconducting Materials and Applications
- Black Holes and Theoretical Physics
- Topic Modeling
- Earthquake Detection and Analysis
Forschungszentrum Jülich
2021-2024
RWTH Aachen University
2021-2024
Graphic Era University
2024
Indian Institute of Technology Bombay
2020-2024
Virginia Tech
2022
Istituto Nazionale di Fisica Nucleare, Sezione di Padova
2021-2022
University of Milano-Bicocca
2022
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Gran Sasso
2021-2022
University of California, Berkeley
2021-2022
University of Padua
2021-2022
We present an improved measurement of the carbon-nitrogen-oxygen (CNO) solar neutrino interaction rate at Earth obtained with complete Borexino Phase-III dataset. The measured rate, R_{CNO}=6.7_{-0.8}^{+2.0} counts/(day×100 tonnes), allows us to exclude absence CNO signal about 7σ C.L. correspondent flux is 6.6_{-0.9}^{+2.0}×10^{8} cm^{-2} s^{-1}, taking into account flavor conversion. use new evaluate C and N abundances in Sun respect H abundance for first time neutrinos. Our result...
We present a comprehensive study of the effectiveness Convolution Neural Networks (CNNs) to detect long duration transient gravitational-wave signals lasting $O(hours-days)$ from isolated neutron stars. determine that CNNs are robust towards signal morphologies differ training set, and they do not require many injections/data guarantee good detection efficiency low false alarm probability. In fact, we only need train one CNN on signal/noise maps in single 150 Hz band; afterwards, can...
We report the first measurement of CNO solar neutrinos by Borexino that uses Correlated Integrated Directionality (CID) method, exploiting sub-dominant Cherenkov light in liquid scintillator detector. The directional information origin is preserved fast photons from neutrino scattered electrons, and used to discriminate between signal background. independent spectral on which previous measurements were based. While analysis could only be applied Phase-III dataset, can use complete data...
As a consequence of superradiant instability induced in Kerr black holes, ultralight boson clouds can be source persistent gravitational waves, potentially detectable by current and future gravitational-wave detectors. These signals have been predicted to nearly monochromatic, with small steady frequency increase (spin-up), but given the several assumptions simplifications done at theoretical level, it is wise consider, from data analysis point view, broader class which phase (or frequency)...
Continuous gravitational wave signals, like those expected by asymmetric spinning neutron stars, are among the most promising targets for LIGO and Virgo detectors. The development of fast robust data analysis methods is crucial to increase chances a detection. We have developed new flexible general framework search this kind which allows reduce computational cost about two orders magnitude with respect current procedures. This can correspond, at fixed computing cost, sensitivity gain up...
The intermediate Palomar Transient Factory (iPTF) autonomously responded to and promptly tiled the error region of first gravitational wave event GW150914 search for an optical counterpart. Only a small fraction total localized was immediately visible in Northern night sky, due both sun-angle elevation constraints. Here, we report on transient candidates identified rapid follow-up undertaken determine nature each candidate. Even area imaged 126 sq deg, after extensive filtering, 8 were...
We describe a method to detect gravitational waves lasting $O(hours-days)$ emitted by young, isolated neutron stars, such as those that could form after supernova or binary star merger, using advanced LIGO/Virgo data. The is based on generalization of the FrequencyHough (FH), pipeline performs hierarchical searches for continuous mapping points in time/frequency plane detector lines frequency/spindown source. show signals whose spindowns are related their frequencies power law can be...
Liquid scintillator detectors play a central role in the detection of neutrinos from various sources. In particular, it is only technique used so far for precision spectroscopy sub-MeV solar neutrinos, as demonstrated by Borexino experiment at Gran Sasso National Laboratory Italy. The benefit high light yield, and thus low energy threshold good resolution, comes cost directional information featured water Cherenkov detectors, measuring 8B above few MeV. this paper we provide first...
The discovery and subsequent study of optical counterparts to transient sources is crucial for their complete astrophysical understanding. Various gamma ray burst (GRB) detectors, more notably the ground--based gravitational wave typically have large uncertainties in sky positions detected sources. Searching these regions spanning hundreds square degrees a formidable challenge most telescopes, which can usually image less than tens single night. We present algorithms optimal scheduling such...
Abstract Cosmogenic radio-nuclei are an important source of background for low-energy neutrino experiments. In Borexino, cosmogenic $$^{11}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow /> <mml:mn>11</mml:mn> </mml:msup> </mml:math> C decays outnumber solar pep and CNO events by about ten to one. order extract the flux these two species, a highly efficient identification this is mandatory. We present here details most consolidated strategy, used throughout...
Continuous gravitational waves signals, emitted by asymmetric spinning neutron stars, are among the main targets of current detectors like Advanced LIGO and Virgo. In case sources, pulsars, which rotational parameters measured through electromagnetic observations, typical searches assume that wave frequency is at a given known fixed ratio with respect to star frequency. For instance, for rotating around one its principal axis inertia signal would be exactly two times star. It possible,...
We investigate the dynamics of triaxial collapse in terms eigenvalues deformation tensor, velocity derivative tensor and gravity Hessian. Using Bond-Myers model ellipsoidal collapse, we derive a new set equations for nine examine their phase space. The main advantage this form is that it eliminates complicated elliptic integrals appear axes evolution more natural way to understand interplay between perturbations. This paper focuses on density-velocity dynamics. Zeldovich approximation...
A rapidly rotating neutron star (NS) with non-axisymmetric deformations is an interesting type of continuous gravitational-Wave (CW) source for the advanced LIGO–Virgo detectors. Within sensitivity bands these detectors, more than half known pulsars (i.e. 1200) in our galaxy are binary systems. All CW signals modulated by doppler effect due to Earth’s motion, while sources systems there extra modulation orbital which further decreases detectability signal, if not properly taken into account....
DLSim, a GUI-based digital logic simulation program developed by Richard Salter at Oberlin College, has been used for class demonstrations and homework exercises in the Computer Organization course over ten years. Until recently its use limited to component of dealing with low-level design using gates flip-flops. A new version, DLSim 3, extends those capabilities through Java plug-ins, making it possible software higher levels abstraction. With we are able present many circuit single...
A number of synoptic sky surveys are underway or being planned. Typically they done with small telescopes and relatively short exposure times. search for transient variable sources involves comparison deeper baseline images, ideally obtained through the same telescope camera. With that in mind we have stacked images from 0.68~m Schmidt on Mt. Bigelow taken over ten years as part Catalina Sky Survey. In order to generate deep reference Real-time Transient Survey, close 0.8 million 8000 fields...
In this era of digitization, a plethora information, spanning multitude themes, is available worldwide. The demand for query focused text summarization growing rapidly due to the presence irrelevant and repetitive information. Many researchers have immensely studied various unsupervised supervised techniques generic summarization. However, field query-based still demands significant research development. This paper presents novel hybrid methodology extract sentences that are relevant...