Mr Vaibhav Tiwari

Research Associate
Gravity Exploration Institute

: TiwariV@cardiff.ac.uk
: +44 29208 74000 ext 20204

I focus on the inference and interpretation of the compact binary population using gravitational wave signals. The inferred population is expected to characterise the scenarios responsible for the formation of compact binaries and is now providing uncharted information. We now know that compact objects merge frequently in the universe. We have started to understand how their masses and spins are distributed. Going forward we would like to understand the environments where compact binaries are formed and merge.

I have been fortunate to contribute to this emerging field. I made central contributions to the search analysis that made the first gravitational wave detection. Recently I wrote a code to flexibly infer the compact binary population. This code discovered multiple features in the binary black hole population, including an emerging structure in the mass distribution showing the presence of peaks and suggesting the over-production of binary black-holes around certain mass values.

Date
Type

2015

Tiwari, V., Klimenko, S., Necula, V. and Mitselmakher, G. 2015. Reconstruction of chirp mass in searches for gravitational wave transients. Classical and Quantum Gravity 33(1), article number: 01LT01. (10.1088/0264-9381/33/1/01LT01)
Aasi, J. et al. 2015. Characterization of the LIGO detectors during their sixth science run. Classical and Quantum Gravity 32(11), article number: 115012. (10.1088/0264-9381/32/11/115012)
Aasi, J. et al. 2015. Advanced LIGO. Classical and Quantum Gravity 32(7), article number: 74001. (10.1088/0264-9381/32/7/074001)

2014

Aasi, J. et al. 2014. Improved upper limits on the stochastic gravitational-wave background from 2009-2010 LIGO and Virgo data. Physical Review Letters 113(23), article number: 231101. (10.1103/PhysRevLett.113.231101)
Aartsen, M. G. et al. 2014. Multimessenger search for sources of gravitational waves and high-energy neutrinos: Initial results for LIGO-Virgo and IceCub. Physical Review D Particles and Fields 90(10), article number: 102002. (10.1103/PhysRevD.90.102002)
Aasi, J. et al. 2014. First all-sky search for continuous gravitational waves from unknown sources in binary systems. Physical Review d Particles and Fields 90(6), article number: 62010. (10.1103/PhysRevD.90.062010)
Aasi, J. et al. 2014. Implementation of an F-statistic all-sky search for continuous gravitational waves in Virgo VSR1 data. Classical and Quantum Gravity 31(16), article number: 165014. (10.1088/0264-9381/31/16/165014)
Aasi, J. et al. 2014. Search for gravitational waves associated with gamma-ray bursts detected by the interplanetary network. Physical Review Letters 113(1), article number: 11102. (10.1103/PhysRevLett.113.011102)
Aasi, J. et al. 2014. Methods and results of a search for gravitational waves associated with gamma-ray bursts using the GEO 600, LIGO, and Virgo detectors. Physical Review D - Particles, Fields, Gravitation and Cosmology 89, pp. -., article number: 122004. (10.1103/PhysRevD.89.122004)
Aasi, J. et al. 2014. The NINJA-2 project: detecting and characterizing gravitational waveforms modelled using numerical binary black hole simulations. Classical and Quantum Gravity 31(11), article number: 115004. (10.1088/0264-9381/31/11/115004)
Aasi, J. et al. 2014. Search for gravitational wave ringdowns from perturbed intermediate mass black holes in LIGO-Virgo data from 2005-2010. Physical Review d Particles and Fields 89(10), article number: 102006. (10.1103/PhysRevD.89.102006)

Research interests

I focus on search of gravitational waves in the data obtained from ground based detectors, in particular gravitational waves produced from the merger of compact binary coalescence. I am a member of the LIGO-Virgo collaboration that detected the first gravitational wave signal. My interest lies in gravitational wave astronomy of numbers, i.e. provided multiple signals observed by the detector what can one say about the past state of the universe. This can include understanding the mass and spin distribution of the black holes, understanding the dynamics (or a combination of them) that produced the observed distributions, or any cosmological or astrophysical information that can be interpreted.

After completing my undergraduate in Aerospace engineering from IIT Kharagpur, I went on to complete master in Physics at the University of South Carolina followed by PhD at the University of Florida. At Florida I was involved in first ever eccentric binary search using excess energy methods, under the guidance of Dr. Sergei Klimenko. As a post-doctoral associate at Cardiff University, I plan to continue the search of gravitational waves from coalescing binaries, under Dr. Stephen Fairhurst.

Mr Vaibhav Tiwari

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