Hartmut Grote
Division of Laser Interferometry and Gravitational Wave Astronomy
Albert Einstein Institute — Hannover, Germany
The Physics of Climate, the IPCC, and the Public Discourse: A Tour D'Horizon of Global Warming
Global warming is a topic of broad scientific inquiry as well as societal relevance. I will review the basic principles of climate physics,
explain the role of the IPCC in assessing different aspects of global warming, and will try to shed some light on the public discourse around
global warming and forces trying to obstruct the science.

Mauricio Richartz
Centro de Matemática
Universidade Federal do ABC — Brazil
Analogue Black Holes: Theory and Experiments
Analogue models of gravity, introduced by Unruh in 1981, have been (for some time now) very helpful towards a better theoretical understanding
of several crucial phenomena at the boundary of gravity and quantum field theory. Experimental research on analogue models, however, started
only very recently. In this talk, I will explain the basic theory behind analogue models of gravity and how they can be used to mimic important
quantum field theory effects in curved spacetimes, like Hawking radiation. I will also focus on some experimental realizations of analogue
models of gravity, including one based on surface waves propagating on water. which I have been involved with very recently (arXiv: 1612.06180).

Maarten Buijsman
Division of Marine Science
University of Southern Mississippi
The Equatorial Pacific "Graveyard" for Semidiurnal Internal Tides: Incoherence or Dissipation?
The jets in the equatorial Pacific Ocean of a realisticallyforced global circulation model with a horizontal resolution of 1/12.5 degree yield
a strong loss of phase coherence in semidiurnal internal tides that propagate equatorward from the French Polynesian Islands and Hawaii. This
loss of coherence is determined with a baroclinic energy analysis, in which the semidiurnalband terms are separated into coherent, incoherent,
and cross terms. For time scales longer than a year the coherent energy flux approaches zero values at the equator, while the total flux is 500
W/m. The timevariability of the incoherent energy flux is compared with phase speed variability computed with the TaylorGoldstein equations.
The variability of monthlymean TaylorGoldstein phase speeds agrees well with the phase speed variability inferred from steric sea surface
height phases extracted with a planewave fit technique. On monthly time scales, the loss of phase coherence in the equatorward beams from the
French Polynesian Islands is attributed to the time variability in the sheared background flow associated with the jets and tropical instability
waves. On an annual time scale, the effect of stratification variability is of equal or greater importance than the background flow is to the
loss of coherence. The model simulation suggests that lowfrequency jets do not noticeably enhance the dissipation of the internal tide, but
merely decohere and scatter it. Thus, the apparent demise of coherent internal tides seen in satellite altimetry maps of the equatorial Pacific
may be due to incoherence rather than dissipation.

Carlos Herdeiro
Departamento de Física
Universidade de Aveiro — Portugal
Can a Black Hole Have Hair?
Black holes are one of the most fascinanting predictions of Einstein's theory of General Relativity. In their most paradigmatic guise, they are
also the simplest objects in the Universe, made solely of space and time. Moreover, powerful mathematical theorems, known as uniqueness
theorems, show that the way space and time can curve into a black hole is quite restricted, and these objects are only described by two
parameters: their total mass and angular momentum. John Wheeler famously coined this simplicity into the mantra "Black Holes have no
hair". But underlying this statement there is an unproved belief known as the "nohair conjecture".
I will start by discussing observational evidence for the existence of black holes in the universe. Then, I will explain why the existence of
some simple types of matter, even if Einstein's theory holds, could challenge the nohair conjecture and produce "hairy" black holes.
Finally, I will discuss how ongoing and forthcoming electromagnetic and gravitational waves observations could test the existence of black
hole "hair" of this sort. 
Seth Hopper
Gravitation in Técnico
Instituto Superior Técnico — Portugal
Bound and Unbound Motion Around Static Black Holes
A massive twobody system will interact gravitationally. Depending on the velocities and separation of bodies, their motion may be bound and
periodic (as in the EarthSun system) or unbound (like a comet that passes the Sun only once). General relativity predicts that each of these
systems will radiate energy in the form of gravitational waves. However, the qualitative difference between the systems implies that different
techniques must be used to analyze them. In this talk I will briefly introduce the mathematical theory behind gravitational radiation of two
body systems (specifically in the extreme massratio regime) and consider how one can efficiently compute that radiation for different classes
of problems. 
Andrea Nerozzi
Gravitation in Técnico
Instituto Superior Técnico — Portugal
The Problem of Gauge Fixing in the NewmanPenrose Formalism
Since its introduction the NewmanPenrose formalism has been widely used in analytical and numerical studies of Einstein's equations, like for
example for the Teukolsky master equation, or as a powerful tool for wave extraction in numerical relativity. The problem of gauge fixing, or
more specifically, tetrad fixing is however still debated and only partially understood when the NP formalism is used to extract gravitational
waves from numerical simulations.
In this talk I will approach the whole formalism with the goal of finding an invariant expression for all the variables in the NP formalism,
namely Weyl scalars and the spin coefficients, once a specific yet generally defined tetrad is chosen.I will show that it is possible to do so,
and give a general recipe for the task, as well as an indication of the quantities and identities that are required. The applications and
importance of this approach to the problem of wave extraction in numerical relativity will be discussed.

Laura Bernard
Gravitation in Técnico
Instituto Superior Técnico — Portugal
Dynamics of Compact Binary Systems at the Fourth PostNewtonian Order
Templates of coalescing compact binaries' gravitational waveform are used for the detection and precise determination of the physical parameters
of gravitational waves by the current and next generations of interferometric detectors. In order to compute the waveform with high accuracy,
the dynamics of compact binary systems should be known to the same precision. In this talk, I will address the question of the dynamics of
nonspinning compact binary systems at the fourth postNewtonian order in harmonic coordinates. I will present a method based on a Fokker action
adapted to the specificities of the postNewtonian formalism, including the socalled tail effects which appear for the first time in the
conservative dynamics at 4PN. I will then derive the energy and periastron advance for circular orbits and show a full agreement with previous
results from gravitational selfforce calculations.

Sabrina Savage
Science Research Office
Marshall Space Flight Center
Reconnecting with Solar Flares
Because the Earth resides in the atmosphere of our nearest stellar neighbor, events occurring on the Sun's surface directly affect us by
interfering with satellite operations and communications, astronaut safety, and in extreme circumstances, power grid stability. Solar flares,
the most energetic events in our solar system, are a substantial source of hazardous space weather affecting our increasingly
technologydependent society. While flares have been observed using groundbased telescopes for over 150 years, modern spacebourne
observatories have provided nearly continuous multiwavelength flare coverage that cannot be obtained from the ground. We can now probe the
origins and evolution of flares by tracking particle acceleration, changes in ionized plasma, and the reorganization of magnetic fields. I will
walk through our current understanding of why flares occur, show several examples of these fantastic explosions, and describe the technology and
instrumentation being developed at Marshall Space Flight Center to observe these phenomena.

Tanaz A. Mohayai
Department of Physics
Illinois Institute of Technology
Measurements Of Beam Cooling In Muon Ionization Cooling Experiment
The international Muon Ionization Cooling Experiment, MICE, is a high energy physics experiment located at Rutherford Appleton Laboratory in the
U.K., and its aim is to demonstrate muon beam cooling for the first time. When muons are produced from pion decay, they occupy a large volume in
the positionmomentum phase space and the process of reducing their volume is known as beam cooling. Several beam cooling techniques exist, but
the ionization cooling is the only technique fast enough to be used for muons within their short lifetime. Ionization cooling occurs when the
beam loses momentum through energy loss, while traversing a material. In MICE, commonly used figures of merit for cooling are the beam emittance
reduction, the phasespace volume reduction, and the phasespace density increase. Emittance is the measure of the size of the beam, and with a
reduced beam emittance or phasespace volume, more muons can fit in a smaller aperture of a costeffective accelerator. This may enable the
construction of a future highintensity muon accelerators, such as a Neutrino Factory or a Muon Collider. To demonstrate beam cooling, MICE
makes use of two scintillatingfiber tracking detectors, immersed in the constant magnetic fields of the Spectrometer Solenoid modules. These
trackers, one upstream and one downstream of the absorber reconstruct and measure the position and momentum coordinates of individual muons, and
the absorber provides the ionization energy loss required for beam cooling. The choice of absorber material is dependent on the achievable
energy loss, and the aim is to maximize beam cooling through energy loss while minimizing beam heating from multiple Coulomb scattering. In
addition, given the precision with which MICE aims to demonstrate beam cooling, it is necessary to develop analysis tools that can work around
any effects which may lead to inaccurate cooling measurements. Nonlinear effects in beam optics is one example of such effects and it can
result in apparent emittance growth or beam heating. The Kernel Density Estimation, KDE technique is an analysis tool which is insensitive to
these nonlinear effects and measures the muon beam phasespace density and volume. This talk will give an overview of the recent MICE results,
the emittance measurement technique in the recent MICE data, and the novel application of the KDE technique in MICE.
