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Fix wording

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prescientmoon 2025-03-20 18:22:13 +01:00
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@ -131,11 +131,11 @@ code-for-last-col = \color{blue}
\item Multi-connected space: it has non-contractable loops
\item Inhomogeneous space: it does not look identical from every point in space
\item Fixing $|\Gamma|=8$, we have three multi-connected manifolds, up to equivalence:
\begin{enumerate}
\item homogeneous: $N3$ and $L(8,1)$
\item inhomogeneous: $N2 \equiv L(8,3)$
\end{enumerate}
\item Results: inhomogeneous spaces have more variety in CMB anisotropies than homogeneous spaces, because the strength of anisotropy suppression is observer dependent.
\begin{enumerate}
\item homogeneous: $N3$ and $L(8,1)$
\item inhomogeneous: $N2 \equiv L(8,3)$
\end{enumerate}
\item Results: inhomogeneous spaces have more variety in CMB anisotropies than homogeneous spaces, because the strength of anisotropy suppression is observer dependent.
\end{itemize}
@ -159,19 +159,19 @@ code-for-last-col = \color{blue}
\end{frame}
\begin{frame}{The setup}
Real CMB observations are affected by instrumental noise and \textit{sky masking}. So, estimating $C_\ell$ accurately requires simulations.
Real CMB observations are affected by instrumental noise and \emph{sky masking}. As a result, estimating $C_\ell$ accurately requires simulations.
Given $C^{th}_\ell$, used to generate synthetic realizations of the CMB sky
\[
\textcolor{blue}{a_{\ell m}} \sim \mathcal{N} (0, C_\ell^{\text{th}}).
\]
However, this introduces bias, which must be corrected using a decorrelation matrix $W$, and a \textit{sky mask} matrix $M$ which accounts for issues caused by masking effects.
Giving us the test statistic (tests the assumption of statistical isotropy):
Unfortunately, this introduces bias, which must be corrected using a decorrelation matrix $W$, and a \textit{sky mask} matrix $M$ which accounts for issues caused by masking effects. This gives us the test statistic (tests the assumption of statistical isotropy):
\[
S_i = \sum_{j} W_{ij} M_j,
\]
Which examines $\langle \textcolor{blue}{a_{\ell m}} \rangle$ across multipole ranges. \\
which examines $\langle \textcolor{blue}{a_{\ell m}} \rangle$ across multipole ranges.
\textbf{\textcolor{red}{Recall:}} $\langle a_{\ell m} \rangle \neq 0$, \textbf{suggests possible anisotropies or preferred directions in the universe}
\end{frame}
@ -182,6 +182,7 @@ code-for-last-col = \color{blue}
\includegraphics[width=0.7\linewidth]{DSE-Test Graph}
\caption{The decorrelated band mean spectrum obtained by the seven-year WMAP data [9].}
\end{figure}
\textcolor{red}{Remark}: In a positively curved space certain multipoles scales being preferred or suppressed in the CMB power spectrum.
\end{frame}