Graduate School in Physics and Astrophysics
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ANNUAL REPORT
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name: Gunnar Markus Riemenschneider
email: riemensc@to.infn.it
ciclo: XXXIII
year completed (1,2 or 3): 3
supervisor: Dr. Alessandro Nagar
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GRADUATE SCHOOL COURSES
(only completed courses, with examination passed in the year)
code: T03
title: Introduction to Quark-Gluon-Plasma
teacher: Nardi and Beraudo
hours: 20
code: T04
title: Dark matter and Neutrino Physics
teacher: Giunti and Taoso
hours: 20
code: 10
title: Big Data Science and Machine Learning
teacher: Legger
hours: 12
code: 10
title: Advanced topics in Higgs Physics
teacher: Andre David Tinico
hours: 12
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COURSES FROM OTHER GRADUATE SCHOOLS
(only completed courses, with examination passed in the year)
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CONFERENCES, WORKSHOP
(only those attended in the current year)
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VISITS AND STAGES
(only those done in the current year )
institution: IHES Paris
place: Paris, France
starting date: 01/10/2019
days: 18
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Research activity/Publications in the current year
(max characters 2500)
Publications:
[1] Comparing Effective One Body Hamiltonians for spin-aligned
coalescing binaries,
Piero Rettegno et al.,
arXiv:1911.10818, Physical Review D 101 (2020) 10, 104027
[2] Multipolar effective one body waveform model for spin-aligned
black hole binaries,
Alessandro Nagar et al.,
arXiv:2001.09082, Physical Review D 102 (2020) 2, 024077
Collaboration papers with the LIGO-Virgo-Collaboration:
[3] Increasing the Astrophysical Reach of the Advanced Virgo
Detector via the Application of Squeezed Vacuum States of Light,
Virgo Collaboration,
Physical Review Letters 123 (2019) 23, 231108
[4] Open data from the first and second observing runs of
Advanced LIGO and Advanced Virgo,
LIGO Scientific and Virgo Collaboration,
arXiv: 1912.11716
[5] A Joint Fermi-GBM and LIGO/Virgo Analysis of Compact Binary
Mergers From the First and Second Gravitational-wave Observing Runs,
LIGO Scientific and Virgo Collaboration and Fermi Gamma-ray Burst Monitor Team,
arXiv: 2001.00923
[6] GW190425: Observation of a Compact Binary Coalescence with Total Mass ∼3.4Msun,
LIGO Scientific and Virgo Collaboration,
arXiv: 2001.01761
[7] The advanced Virgo longitudinal control system for the O2 observing run,
Virgo Collaboration,
Astroparticle Physics 116 (2020) 102386
[8] GW190412: Observation of a Binary-Black-Hole Coalescence with Asymmetric Masses,
LIGO Scientific and Virgo Collaboration,
arXiv: 2004.08342
[9] GW190814: Gravitational Waves from the Coalescence of a 23 Solar Mass,
Black Hole with a 2.6 Solar Mass Compact Object,
LIGO Scientific and Virgo Collaboration,
arXiv: 2006.12611
[10] Gravitational-wave constraints on the equatorial ellipticity of millisecond pulsars,
LIGO Scientific and Virgo Collaboration,
arXiv: 2007.14251
[11] Properties and astrophysical implications of the 150 Msun binary black hole merger GW190521,
LIGO Scientific and Virgo Collaboration,
arXiv: 2009.01190
[12] GW190521: A Binary Black Hole Merger with a Total Mass of 150 Msun,
LIGO Scientific and Virgo Collaboration,
arXiv: 2009.01075
Research activities:
The primary focus of my work remained also in this third year the TEOB-model series.
The multipolar model was finished and published in [2]. The stand alone C-code version
of the model was addopted to inclused the full non-spinning and spinning subdominant modes.
These were validated against the catalog of Numerical Relativity Waveforms used in [2].
The results show that on the level of the mismatch the C-code reproduces the results obtained
with the MATLAB code and can thus be used for parameter estimation purposes.
[2] also includes a large analysis of the Numerical Relativity uncertainty of the SXS catalog
waveforms presented. The highest and next-to-highest resolution of the waveforms were compared.
A fit of the NQC parameters (a1,a2) has been done for the latest version of the TEOB-model
series, allowing the fast evaluation of the code and skipping iteration. The region of validity of the
fit extends far beyond the domain of calibration. Up to mass-ratios 30 and arbitrary, aligned spins.
Further, I contributed to the ROTA for first responses to several events in the third observing
run of the LIGO Scientific and Virgo Collaboration (LVC). During the ROTA a pair of scientists
were asigned the next upcomming event and had to ensure the starting of analysis software.
Further postprocessing and presentation of events was done to communicate the results to the
parameter estimation subgroup of the LVC and the results have been made available to the public.
BE AWARE: visits and stages,research activity and pubs are not evaluated as didactic credits,
but are requested to trace the PhD students' career