Office: 2019 NPB

352.392.9225

klimenko@phys.ufl.edu

##### Sergey Klimenko

#### Professor

#### Education

PhD Novosibirsk, BINP, Russia (1993)#### Research Group

Institute for High Energy Physics and Astrophysics (IHEPA)#### Research Interest

Detection of gravitational wavesMy research interests include studies of gravitational waves with Laser Interferometer Gravitational-wave Observatory (LIGO) and multi-messenger astronomy. I work on detection and reconstruction detection of gravitational waves for a wide range of promising astrophysical sources including: various types of gamma-ray bursts, core-collapse supernovae, soft-gamma repeaters, cosmic strings, late inspiral and mergers of compact binaries, ring-downs of perturbed neutron stars or black holes, and as-yet-unknown systems. Such catastrophic events may produce bursts of gravitational-wave radiation detectable by LIGO and other terrestrial detectors. A key to understanding sources of gravitational waves in the Universe is linking the gravitational-wave observations to other astrophysical "messengers" such as light waves, cosmic rays, and neutrinos. Such multi-messenger astronomy can reveal crucial insights into the origin, life cycle, and environment of the objects that radiate gravitational waves.

I develop a search algorithm Coherent WaveBurst together with my UF colleagues and collaborators from Germany (AEI Hannover) and Italy (Padova & Trento). On September 14, 2015 the Coherent WaveBurst algorithm discovered a signal from two colliding black holes three minutes after the data was collected from the LIGO instruments. The key features of Coherent WaveBurst are that by using wavelets it explores the time-frequency structure of the data and finds signals in the LIGO frequency band without restrictions to a particular source type listed above. Most of these sources are difficult to model, therefore, the search algorithms should use no or little assumptions on the source models. Coherent Waveburst was designed to cast the widest possible net for gravitational-wave bursts and extract their properties such as bandwidth, duration, sky location, polarization state and signal waveform. Also it can detect signal in real-time, minutes after a gravitational wave is recorded by detectors, which is important for the multi-messenger astronomy.

#### Selected Publications

B.P. Abbott et al. (LIGO Scientific Collaboration and Virgo Collaboration) Observation of Gravitational Waves from a Binary Black Hole Merger Phys. Rev. Lett. 116, 061102S. Klimenko et al., "Method for detection and reconstruction of gravitational wave transients with networks of advanced detectors,'' Phys. Rev. D 93, 042004 (2016)

V. Tiwari, S. Klimenko, V.~Necula and G. Mitselmakher, "Reconstruction of chirp mass in searches for gravitational wave transients,'' Class. Quant. Grav. 33, no. 1, 01LT01 (2016)

V. Necula, S. Klimenko and G.~Mitselmakher "Transient analysis with fast Wilson-Daubechies time-frequency transform'', J. Phys. Conf. Ser. 363 012032 (2012)

Klimenko, S., Vedovato, G., Drago, M., Mazzolo, G., Mitselmakher, G., Pankow, C., Prodi, G., Re, V., Salemi, F., Yakushin, I. "Localization of gravitational wave sources with networks of advanced detectors'', Phys. Rev. D., 83, 102001 (2011)

S. Klimenko, I. Yakushin, A.R. Mercer, G. Mitselmakher, " A coherent method for detection of gravitational wave bursts'', Class. Quantum Grav. 25, (2008) 114029.

Klimenko S., Mohanty S., Rakhmanov M. and Mitselmakher G., "Constraint likelihood analysis for a network of gravitational wave detectors'', Phys. Rev. D, 72, 122002 (2005)