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5th Iberian Gravitational Wave Meeting
12-14 May 2015, Barcelona, Spain
http://www.ice.csic.es/research/IGWM2015/index.html
Institut de Ciències de
l’Espai (CSIC-IEEC)
Institut de Ciències del
Cosmos (UB)
Astronomy & Astrophysics
Research Group
Universitat Politècnica
de Catalunya (UPC)
With the additional support of the Centro Nacional de
Fı́sica de Partı́culas, Astropartı́culas y Nuclear (CPAN)
U
UNIVERSITAT DE BARCELONA
B
ICE (CSIC-IEEC), ICCUB (UB), AAG (UPC)
3
5th Iberian Gravitational Wave Meeting. Barcelona, 12-14 May 2015
Programme Summary
Tuesday, May 12th
Registration
14:00 - 15:00
Session Chair: C.F. Sopuerta
15:00 - 15:15
[+0]
C.F. Sopuerta
Welcome & Logistics
15:15 - 16:10
[+5]
M. Punturo
From Virgo to ET: evolving from 1st to 3rd generation
of GW detectors
Coffee Break
16:15 - 16:45
Session Chair: Ulrich Sperhake
16:45 - 17:10
[+5]
M. Oliver
The LIGO continuous wave mock data challenge for
isolated spinning neutron stars
17:15 - 17:40
[+5]
A. Torres-Forne
Total-variation-based methods for gravitational wave
denoising
17:45 - 18:10
[+5]
E. Elizalde
The Big Bang Theory: Historical Annotations
18:30
Adjourn
4
Wednesday, May 13th
Session Chair: Alicia M. Sintes
09:30 - 10:25
[+5]
Gravitational waves from inflation: the good, the bad
and the ugly
S. Sarkar
Coffee Break
10:30 - 11:00
11:00 - 11:25
[+5]
D.G. Figueroa
11:30 - 11:55
[+5]
F. Jiménez-Forteza
Gravitational Waves from the Standard Model Higgs
Exploring the Parameter Space of Black Hole Binaries
12:00 - 12:25
[+5]
C.F. Sopuerta
The science of eLISA (The Gravitational Universe)
Lunch
12:30 - 15:00
Session Chair: Miquel Nofrarias
15:00 - 15:55
[+5]
W.J. Weber
LISA Pathfinder and the road to eLISA
Coffee Break
16:00 - 16:30
16:30 - 16:45
[+5]
F. Gibert
Thermal experiments in LISA Pathfinder: preparing
for operations
16:50 - 17:15
[+5]
S. Husa
Accurate Phenomenological Waveform Models for Black Hole
Coalescence in the Frequency Domain
17:20 - 17:45
[+5]
J. Calderón
Impact of higher order modes in gravitational wave searches
17:50 - 18:15
[+5]
N. Sanchis-Gual
Quasistationary solutions of self-gravitating scalar
fields around black holes
18:20
Adjourn
21:00
Dinner at Asador de Aranda
5
Thursday, May 14th
Session Chair: Mar Bastero Gil
09:30 - 10:25
[+05]
J. Garriga
Sources of primordial gravitational waves
10:30 - 10:45
[+05]
M. Nofrarias
Development of millihertz sensors for space-based
gravitational wave detectors
Coffee Break
10:50 - 11:20
11:20 - 12:15
[+05]
U. Sperhake
12:20 - 12:45
[+05]
M. Zilhao
Morphologies and phase transitions in precessing
black-hole binaries
Simulating Accreting Binary Black Holes
12:50 - 13:15
[+05]
S. Odintsov
Inflationary cosmology from modified gravity
13:20
End of the Meeting
6
Abstracts
Juan Calderón Bustillo (Universitat de les Illes Balears)
Impact of higher order modes in gravitational wave searches
Current gravitational wave searches for compact binaries neglect the higher order harmonics of the emitted radiation. Several
studies have demonstrated that this neglection has an important impact in terms of event loss and parameter bias on high
mass non-spinning searches and in the context of the design version of Advanced LIGO. We extend these studies to the case
of single-aligned spin searches for both Advanced LIGO and the upcoming early Advanced LIGO, which will come online this
year and whose higher frequency seismic wall crucially enhances the effect of higher order modes.
Emili Elizalde (Institut de Ciències de l’Espai (CSIC-IEEC))
The Big Bang Theory: Historical Annotations
Some historical introduction to a number of fundamental issues about our Universe will be given, starting with the concept of
Big Bang itself, and aimed at putting into context the possibility of detecting primordial gravitational waves in the CMB.
Daniel G. Figueroa (CERN)
Gravitational Waves from the Standard Model Higgs
Under many circumstances the Standard Model (SM) Higgs field may form a homogeneous condensate during Inflation, typically with a very large amplitude. The post-inflationary decay of the condensate into other SM species, due to non-perturbative
effects, represents an important event in the Universe, with many possible cosmological consequences. In this talk I will show
how the Higgs decay products source a significant background of Gravitational Waves, which contains information about the
SM couplings at high energies.
J. Garriga (Universitat de Barcelona)
Sources of primordial gravitational waves
I will review several possible sources of gravitational waves from early universe dynamics. Such waves may be produced at first
order phase transitions, by the motion of a network of cosmic strings, at preheating at the end of inflation, during inflation, or
perhaps even before inflation.
Ferran Gibert (Institut de Ciències de l’Espai (CSIC-IEEC))
Thermal experiments in LISA Pathfinder: preparing for operations
The LISA Pathfinder satellite, to be launched late this year, is going to test key technology for a future space-borne gravitational wave observatory. Its main experiment, the LISA Technology
√ Package (LTP), is aimed to measure relative motion
between two free-falling test masses within a precision of few pm/ Hz in the band between 1 − 30 mHz. Amongst many
different noise sources, at such low frequencies the LTP instrumentation is sensitive to temperature noise, what required the
development of a specific thermal diagnostics subsystem to characterise the impact of
√ temperature perturbations. Beyond the
commitment of measuring temperature fluctuations within a precision of 10−5 K/ Hz, such a subsystem includes a set of
heaters to study different thermal effects through dedicated experiments. These series of investigations will address thermoelastic distortion, temperature-gradients effects on the LTP inertial sensors and thermal-induced optical pathlenght’s variation.
In this presentation we will report how these experiments are going to be conducted and analysed during the in-flight operations.
Sascha Husa (Universitat de les Illes Balears)
Accurate Phenomenological Waveform Models for Black Hole Coalescence in the Frequency Domain
In this talk I will present a new analytical waveform model for aligned spin binary black hole coalescence. The model is
constructed in the frequency domain and calibrated to numerical relativity waveforms of mass ratio up to 18 and the early
inspiral of spinning effective one body waveforms.
Francisco Jiménez-Forteza (Universitat de les Illes Balears)
Exploring the Parameter Space of Black Hole Binaries
Coalescing systems of black hole binaries may be the dominant source of advanced gravitational wave detectors, and one of the
key theoretical challenges of the emerging field of gravitational wave astronomy is to accurately model their waveforms. This
talk summarizes some of the recent progress in exploring the binary black hole parameter space with numerical solutions of the
Einstein equations, and synthesize the numerical and perturbative results into analytically models for the waveforms.
7
Miquel Nofrarias (Institut de Ciències de l’Espai (CSIC-IEEC))
Development of millihertz sensors for space-based gravitational wave detectors
In the following months LISA Pathfinder will test for the first time the technology required to detect gravitational waves in
space. A future GW detector in space will open the low-frequency window of the gravitational sky, which is expected to be
rich in sources. However, unveiling this new observational window to the Universe implies facing new experimental challenges,
in particular the development of ultra-stable sensor technologies. In this talk I will focus on the work being carried on in this
aspect in our group at the Institut de Ciències de lEspai (IEEC-CSIC).
Sergey Odintsov (Institut de Ciències de l’Espai (CSIC-IEEC) and ICREA)
Inflationary cosmology from modified gravity
Brief review of inflationary cosmology from F(R) gravity is made. The comparison with dark energy acceleration in the same
theory is done. Unification of inflation with dark energy in modified gravity remains to be the most natural possibility. The
account of quantum effects to modified gravity inflation is considered.
Miquel Oliver (Universitat de les Illes Balears)
The LIGO continuous wave mock data challenge for isolated spinning neutron stars
In this talk we will review the methods used to search for continuous gravitational waves from unknown isolated neutron stars.
Special attention will be placed on the all-sky semi-coherent method based on the Hough transform that has been used to
analyze data from the LIGO and Virgo detectors. We will discuss the choices we make in designing the search parameter
spacing and the splitting of the search volume based on computational cost and efficiency. We will also describe the ongoing
continuous wave mock data challenge we are participating in order to explore and compare the capabilities of the different
search algorithms used by the CW group.
Michele Punturo (INFN Perugia & European Gravitational Observatory (EGO))
From Virgo to ET: evolving from 1st to 3rd generation of GW detectors
The network of Interferometric Gravitational wave detectors is entering in the so-called advanced phase. In few years from now
Advanced LIGO and Advanced Virgo are expected to detect the gravitational waves emitted by a binary system of compact
stars. The achievements of the initial interferometers, the scientific targets of the advanced and future 3rd generation observatories and the technological evolutions from Virgo to the Einstein Telescope are briefly discussed.
Nicolás Sanchis-Gual (Universidad de Valencia)
Quasistationary solutions of self-gravitating scalar fields around black holes
Recent perturbative studies have shown the existence of long-lived, quasistationary configurations of scalar fields around black
holes. In particular, such configurations have been found to survive for cosmological time scales, which is a requirement for
viable dark matter halo models in galaxies based on such types of structures. We have performed a series of numerical relativity
simulations of dynamical nonrotating black holes surrounded by self-gravitating scalar fields solving numerically the coupled
system of equations formed by the Einstein and the Klein-Gordon equations under the assumption of spherical symmetry using
spherical coordinates. Our results confirm the existence of oscillating, long-lived, self-gravitating scalar field configurations
around nonrotating black holes in highly dynamical spacetimes with a rich scalar field environment.
Subir Sarkar (Oxford University and NBI Copenhagen)
Gravitational waves from inflation: the good, the bad and the ugly
The detection by the BICEP2 telescope at the South Pole of a ’B- mode polarisation’ signal in the cosmic microwave background
was widely hailed as the first direct evidence that the early universe underwent a period of inflation, during which gravitational
waves were generated with an amplitude of 20% of the scalar density fluctuations. Subsequently data from the Planck satellite
has shown that the signal can be attributed to emission from dust in our Galaxy. We had in fact pointed out earlier that there
is significant foreground contamination of CMB maps even at such high galactic latitudes. This is of paramount importance
for many ongoing and proposed ground-based experiments which are seeking to detect gravitational waves from inflation. I will
review the issue and possible ways forward.
8
C.F. Sopuerta (Institut de Ciències de l’Espai)
The science of eLISA (The Gravitational Universe)
On October 2013 the European Space Agency approved the science theme The Gravitational Universe for the science of its
future L-class mission L3 (with launch schedule in the decade of 2030). The main goal is to develop Gravitational Wave
Astronomy in the low-frequency band, where there is a wealth of sources and the science potential is enormous. In this talk I
would summary the main goals of this scientific program and the status of the scientific developments.
Ulrich Sperhake (Department of Applied Mathematics and Theoretical Physics (DAMTP), University of Cambridge)
Morphologies and phase transitions in precessing black-hole binaries
We discuss a formalism for precession averaged modeling of black-hole binary inspiral. In this formalism, a set of variables is used
to characterize the binaries that optimizes the conservation properties of the post-Newtonian evolution equations and arrives at
a single ordinary differential equation and, thus, a substantially improved efficiency in the modelling of the gravitational-wave
driven binary inspiral as compared with traditional orbit-averaged methods. The formalism furthermore enables us to identify
three specific morphologies for black-hole binaries. We will discuss these and the transition between these different phases and
possible applications for gravitational-wave and astrophysics.
Alejandro Torres-Forne (Universidad de Valencia)
Total-variation-based methods for gravitational wave denoising
We present initial results of the application of Total Variation (TV) denoising algorithms to LIGO real data. These algorithms,
which do not need any a priori information about the signals, have been developed and fully tested in the context of image
processing. In a recent paper we have shown the feasibility of these methods in the context of gravitational wave signals,
for the considerably simpler case of signals embedded in additive Gaussian noise. Here, we apply our TV algorithms to two
different types of numerically-simulated gravitational wave signals embedded in real noise, namely bursts produced from the
core collapse of rotating stars and waveforms from binary black hole mergers.
W.J. Weber (Università di Trento (INFN))
LISA Pathfinder and the road to eLISA
√
LISA Pathfinder (LPF) will attempt the femto-g/ Hz differential acceleration measurement that is needed for the eLISA
gravitational wave observatory at mHz frequencies. The scientific payload has been integrated and prepared for launch in
October 2015. This talk will present the LISA Pathfinder measurement, the expected performance, and its role in preparing
the metrology for eLISA.
Miguel Zilhao (Universitat de Barcelona)
Simulating Accreting Binary Black Holes
In this talk we introduce the field of General Relativistic Magnetohydrodynamics (GRMHD) and give an overview on recent
efforts toward simulating and visualizing astrophysically realistic gas dynamics around compact binaries. In particular we
motivate the approach where a post-Newtonian expansion is used to construct an analytic spacetime, and show preliminary
results of circumbinary disks surrounding equal-mass non-spinning black hole binaries.
9
List of Participants
1. Mar Bastero Gil (Universidad de Granada, Spain) <mbg@ugr.es>
2. Juan Calderón Bustillo (University of the Balearic Islands (UIB), Spain) <juan.calderon.bustillo@gmail.com>
3. Ruxandra Cojocaru (UPC, Spain) <elena.ruxandra.cojocaru@upc.edu>
4. Rafael da Costa Nunes (Universitat Autònoma de Barcelona (UAB), Spain) <rafadcnunes@gmail.com>
5. Emilio Elizalde (Institut de Ciències de l’Espai (CSIC-IEEC), Spain) <elizalde@ieec.uab.es>
6. Domènec Espriu (ICC (UB), Spain) <espriu@icc.ub.edu>
7. Francesc Fayos (FA (UPC), Spain) <f.fayos@upc.edu>
8. Daniel G. Figueroa (CERN, Switzerland) <daniel.figueroa@cern.ch>
9. Luciano Gabbanelli (ICC (UB), Spain) <lucianogabbanelli@gmail.com>
10. Enrique Garcı́a-Berro (UPC, Spain) <enrique.garcia-berro@upc.edu>
11. Jaume Garriga (ICC (UB), Spain) <garriga@cosmos.phy.tufts.edu>
12. Cristiano Germani (ICC (UB), Spain) <germani@icc.ub.edu>
13. Lluis Gesa (Institut de Ciències de l’Espai (CSIC-IEEC), Spain) <gesa@ieec.cat>
14. Ferran Gibert (Institut de Ciències de l’Espai (CSIC-IEEC), Spain) <gibert@ieec.cat>
v
15. José
M. González Castro (Università di Pisa, Italy) <jose.gonzalez@for.unipi.it>
16. Sascha Husa (University of the Balearic Islands (UIB), Spain) <sascha.husa@uib.es>
17. Francisco Jiménez-Forteza (University of the Balearic Islands (UIB), Spain) <f.jimenez@uib.es>
18. Elahe Karimkhani (Universitat de Barcelona (UB), Spain) <elahe@ecm.ub.es>
19. Ivan Lloro (Institut de Ciències de l’Espai (CSIC-IEEC), Spain) <lloro@ice.csic.es>
20. Antonio Marquina (Universidad de Valencia (UV), Spain) <marquina@uv.es>
21. Vı́ctor Martı́n (Institut de Ciències de l’Espai (CSIC-IEEC), Spain) <vmartin@ieec.cat>
22. Eduard Massó (Departament de Fı́sica & IFAE (UAB), Spain) <masso@ifae.es>
23. Ignacio Mateos (Institut de Ciències de l’Espai (CSIC-IEEC), Spain) <mateos@ice.csic.es>
24. Mauricio Misquero (Institut de Ciències de l’Espai (CSIC-IEEC), Spain) <mauricio.misquero@gmail.com>
25. Miquel Nofrarias (Institut de Ciències de l’Espai (CSIC-IEEC), Spain) <nofrarias@ice.cat>
26. Sergey Odintsov (Institut de Ciències de l’Espai (CSIC-IEEC) & ICREA, Spain) <odintsov@ice.cat>
27. Miquel Oliver (University of the Balearic Islands (UIB), Spain) <miquel oli@me.com>
28. Michele Punturo (INFN Perugia & EGO, Italy) <michele.punturo@pg.infn.it>
29. Francisco Rivas (Institut de Ciències de l’Espai (CSIC-IEEC), Spain) <rivas@ice.cat>
30. Nicolás Sanchis-Gual (Universidad de Valencia (UV), Spain) <nicolas.sanchis@uv.es>
31. Daniel Santos-Oliván (Institut de Ciències de l’Espai (CSIC-IEEC), Spain) <santos@ice.cat>
32. Subir Sarkar (Oxford U. & NBI Copenhagen, (UK & Denmark)) <subir.sarkar@physics.ox.ac.uk>
33. Alicia M. Sintes (University of the Balearic Islands (UIB), Spain) <alicia.sintes@uib.es>
34. Carlos F. Sopuerta (Institut de Ciències de l’Espai (CSIC-IEEC), Spain) <sopuerta@ieec.uab.es>
35. Ulrich Sperhake (DAMTP, University of Cambridge, UK) <sperhake@tapir.caltech.edu>
36. Josep Suriol (ETSECCPB-UPC, Spain) <jose.suriol@upc.edu>
37. Ramón Torres (UPC, Spain) <ramon.torres-herrera@upc.edu>
38. Santiago Torres (UPC, Spain) <santiago.torres@upc.edu>
39. Alejandro Torres-Forne (Universidad de Valencia (UV), Spain) <Alejandro.Torres@uv.es>
40. William Joseph Weber (Università di Trento (INFN), Italy) <weber@science.unitn.it>
41. Miguel Zilhao (Universitat de Barcelona (UB), Spain) <mzilhao@ffn.ub.es>

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