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\frametitle{Outline}
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\author{ {\fontspec{Trebuchet MS}Marcin Chrz\k{a}szcz} (Universit\"{a}t Z\"{u}rich, IFJ PAN)}
\institute{UZH}
\title[Introduction to GAMBIT]{Introduction to GAMBIT}
\begin{document}
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{
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\begin{frame}[c]%{\phantom{title page}}
\begin{center}
\begin{center}
\begin{columns}
\begin{column}{0.75\textwidth}
\flushright\fontspec{Trebuchet MS}\bfseries \Huge {GAMBIT}
\end{column}
\begin{column}{0.02\textwidth}
{~}
\end{column}
\begin{column}{0.23\textwidth}
% \hspace*{-1.cm}
\vspace*{-3mm}
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\quad
\vspace{3em}
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\flushright \vspace{-1.8em} {\fontspec{Trebuchet MS} \Large Marcin Chrząszcz\\\vspace{-0.1em}\small \href{mailto:mchrzasz@cern.ch}{mchrzasz@cern.ch}}
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\vspace{1em}
\footnotesize\textcolor{gray}{Universit\"{a}t Z\"{u}rich, \\ Institute of Nuclear Physics, Polish Academy of Science}\normalsize\\
\vspace{0.5em}
\textcolor{normal text.fg!50!Comment}{KEK meeting, KEK\\October 29, 2015}
\end{center}
\end{frame}
}
\begin{frame}
\frametitle{The GAMBIT Collaboration}
26 Members, 15 institutions, 9 countries \\
8 Experiments, 4 major theory codes \vspace{2mm}
\scriptsize
\begin{columns}
\column{0.7\textwidth}
\begin{tabular}{l l}
\textbf{Fermi-LAT} & J.\ Conrad, J.\ Edsj\"o, G.\ Martinez\\
& \P.\ Scott\vspace{0.5mm}\\
\textbf{ATLAS} & A.\ Buckley, P.\ Jackson, C.\ Rogan,\\
& A.\ Saavedra, M.\ White\vspace{0.5mm}\\
\textbf{CTA} & C. Bal\'azs, T.\ Bringmann, \\
& J.\ Conrad, M.\ White\vspace{0.5mm}\\
\textbf{HESS} & J.\ Conrad \vspace{0.5mm}\\
\textbf{LHCb} & M.\ Chrz\k{a}szcz, N.\ Serra\vspace{0.5mm}\\
\textbf{IceCube} & J.\ Edsj\"o, C.\ Savage, P.\ Scott\vspace{0.5mm}\\
\textbf{AMS-02} & A.\ Putze\vspace{0.5mm}\\
\textbf{CDMS, DM-ICE} & L. Hsu\vspace{0.5mm}\\
\textbf{XENON/DARWIN} & J.\ Conrad\vspace{0.5mm}\\
\textbf{Theory} & P.\ Athron, C. Bal\'azs, T.\ Bringmann, \\
& J.\ Cornell, L.\ Dal, J.\ Edsj\"o, B.\ Farmer,\\
& A.\ Krislock, A.\ Kvellestad, M.\ Pato, \\
& F.\ Mahmoudi, A.\ Raklev, C.\ Savage,\\
& P.\ Scott, C.\ Weniger, M.\ White \\
\end{tabular}
\column{0.4\textwidth}
\end{columns}
\begin{textblock}{45}(73,13)
\includegraphics[width=\linewidth]{Logo2full}\\
\includegraphics[width=\linewidth]{GroupPhoto}
\end{textblock}
\end{frame}
\begin{frame}
\frametitle{Modules}
Physics Modules
\begin{itemize}
\corange{\item ColliderBit} ATLAS and CMS likelihoods
\corange{\item DarkBit} Dark Matter searches
\corange{\item FlavBit} -- flavour physics inc. $g-2$, $b\rightarrow s\gamma$, $B$ decays (new channels, theory uncerts, LHCb likelihoods)
\corange{\item SpecBit} -- generic BSM spectrum object, providing RGE running, masses, mixings, etc via interchangeable interfaces to different RGE codes
\corange{\item DecayBit} -- decay widths for all relevant SM \& BSM particles
\corange{\item EWPOBit} -- precision tests (mostly by interface to FeynHiggs, alt. SUSY-POPE)
\end{itemize}
+\corange{ScannerBit}: manages statistics, parameter sampling and optimisation algorithms
\end{frame}
\begin{frame}
\frametitle{Backends: mix and match}
\begin{itemize}
\item GAMBIT modules consist of a number of standalone \textbf{module functions}
\item Module functions can depend on each other, or they can require specific functions from \textbf{backends}
\item Backends are external code libraries (DarkSUSY, FeynHiggs, etc) that include different functions
\item GAMBIT automates and abstracts the interfaces to backends $\rightarrow$ backend functions are tagged according to \alert{what they calculate}
\item $\rightarrow$ with appropriate module design, \alert{different backends and their functions can be used interchangeably}
\item GAMBIT dynamically adapts to use whichever backends are actually present on a user's system (+ provides details of wtf it did of course)
\end{itemize}
\only<2>{
\begin{textblock}{110}(10,30)
\includegraphics[width=\textwidth]{backendshot}
\end{textblock}
}
\end{frame}
\begin{frame}
\frametitle{GAMBIT: a toy example}
\centering
\includegraphics[width=0.9\textwidth]{coreChainDiagram_example_wlogo}
\end{frame}
\begin{frame}
\frametitle{Dependency Resolution}
\uncover<1>
{
\begin{itemize}
\item Module functions and backend functions get arranged into a \textbf{dependency tree}
\item Starting with requested observables and likelihoods, fills each dependency and backend requirement
\item Obeys rules at each step: allowed models, allowed backends, constraints from input file, etc
\item $\rightarrow$ tree constitutes a directed acyclic graph
\item $\rightarrow$ GAMBIT uses graph-theoretic methods to `solve' the graph to determine function evaluation order
\end{itemize}
}
\visible<1>
{
\includegraphics[width=\textwidth]{GAMBIT_active_functor_graph}
}
\only<2>{
\begin{textblock}{73}(45,17)
\includegraphics[width=\textwidth, trim = 0 0 8000 0, clip=true]{GAMBIT_active_functor_graph}
\end{textblock}
}
\end{frame}
\begin{frame}
\frametitle{Hierarchical Model Database}
\begin{itemize}
\item Models are defined by their parameters and relations to each other
\item Models can inherit from \textbf{parent models}
\item Points in child models can be \textbf{automatically translated} to ancestor models
\item \textbf{Friend models} also allowed (cross-family translation)
\item Model dependence of every module/backend function is tracked $\implies$ \alert{maximum safety, maximum reuse}
\end{itemize}
\includegraphics[width=0.8\textwidth]{GAMBIT_model_hierarchy}
\end{frame}
\begin{frame}
\frametitle{Expansion: adding new functions}
Adding a new module function is easy:
\begin{enumerate}
\item Declare the function to GAMBIT in a module's \textbf{rollcall header}\begin{itemize}
\item Choose a capability
\item Declare any \textbf{dependencies}
\item Declare any \textbf{backend requirements}
\item Declare any specific \textbf{allowed models}
\item other more advanced declarations also available
\end{itemize}
\includegraphics[width=\textwidth]{rollcallshot}
\item Write the function as a simple C$++$ function\\(one argument: the result)
\end{enumerate}
\end{frame}
\begin{frame}
\frametitle{Other nice technical features}
\begin{itemize}
\item \textbf{Scanners}: MultiNest, Diver (diff.\ evolution), PIKAIA (genetic algorithms), GreAT (MCMC)
\item \textbf{Statistics}: Bayesian, Profile Likelihood, later full Neyman
\item Mixed-mode \textbf{MPI + openMP}, mostly automated
\item diskless generalisation of various Les Houches Accords
\item \textbf{BOSS}: dynamic loading of C++ classes from backends (!)
\item \textbf{all-in or module standalone} modes -- easily implemented from single cmake script
\item \textbf{automatic getters} for obtaining, configuring + compiling backends\footnote{if a backend breaks, won't compile and/or kills your dog, blame the\\\protect{\hspace{5mm}} authors (not us\ldots unless we \textbf{are} the authors\ldots)}
\item \textbf{flexible output streams} (ASCII, databases, binary, \ldots)
\item more more more\ldots
\end{itemize}
\end{frame}
\begin{frame}
\frametitle{Closing remarks}
\begin{itemize}
\item{Robust analysis of dark matter and BSM physics requires multi-messenger global fits}
\item{GAMBIT is coming:}\begin{itemize}
\item[$\rightarrow$]{Global fits to many models for the first time}
\item[$\rightarrow$]{Better global fits to familiar ones}
\item[$\rightarrow$]{Highly modular, usable and extendable public code}
\item[$\rightarrow$]{Faster, more complete and more consistent theory explorations + experimental analysis prototyping}
\end{itemize}
\end{itemize}
\end{frame}
\backupbegin
\begin{frame}\frametitle{Backup}
\topline
\end{frame}
\backupend
\end{document}
mchrzasz