pnas/pnas.tex
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   237 More specifically, life is easier when working with maximal, rather than minimal, collections of axioms.}
   237 More specifically, life is easier when working with maximal, rather than minimal, collections of axioms.}
   238 
   238 
   239 \nn{say something about defining plain and infty cases simultaneously}
   239 \nn{say something about defining plain and infty cases simultaneously}
   240 
   240 
   241 There are five basic ingredients 
   241 There are five basic ingredients 
   242 (not two, or four, or seven, but {\bf five} basic ingredients,
   242 \cite{life-of-brian} of an $n$-category definition:
   243 which he shall wield all wretched sinners and that includes on you, sir, there in the front row!
       
   244 (cf.\ Monty Python, Life of Brian, http://www.youtube.com/watch?v=fIRb8TigJ28))
       
   245 of an $n$-category definition:
       
   246 $k$-morphisms (for $0\le k \le n$), domain and range, composition,
   243 $k$-morphisms (for $0\le k \le n$), domain and range, composition,
   247 identity morphisms, and special behavior in dimension $n$ (e.g. enrichment
   244 identity morphisms, and special behavior in dimension $n$ (e.g. enrichment
   248 in some auxiliary category, or strict associativity instead of weak associativity).
   245 in some auxiliary category, or strict associativity instead of weak associativity).
   249 We will treat each of these in turn.
   246 We will treat each of these in turn.
   250 
   247 
   634 \end{proof}
   631 \end{proof}
   635 
   632 
   636 \subsection{Specializations}
   633 \subsection{Specializations}
   637 \label{sec:specializations}
   634 \label{sec:specializations}
   638 
   635 
   639 The blob complex has two important special cases.
   636 The blob complex has several important special cases.
   640 
   637 
   641 \begin{thm}[Skein modules]
   638 \begin{thm}[Skein modules]
   642 \label{thm:skein-modules}
   639 \label{thm:skein-modules}
   643 \nn{Plain n-categories only?}
   640 \nn{Plain n-categories only?}
   644 The $0$-th blob homology of $X$ is the usual 
   641 The $0$-th blob homology of $X$ is the usual 
   661 
   658 
   662 Theorem \ref{thm:skein-modules} is immediate from the definition, and
   659 Theorem \ref{thm:skein-modules} is immediate from the definition, and
   663 Theorem \ref{thm:hochschild} is established by extending the statement to bimodules as well as categories, then verifying that the universal properties of Hochschild homology also hold for $\bc_*(S^1; -)$.
   660 Theorem \ref{thm:hochschild} is established by extending the statement to bimodules as well as categories, then verifying that the universal properties of Hochschild homology also hold for $\bc_*(S^1; -)$.
   664 
   661 
   665 
   662 
       
   663 \begin{thm}[Mapping spaces]
       
   664 \label{thm:map-recon}
       
   665 Let $\pi^\infty_{\le n}(T)$ denote the $A_\infty$ $n$-category based on maps 
       
   666 $B^n \to T$.
       
   667 (The case $n=1$ is the usual $A_\infty$-category of paths in $T$.)
       
   668 Then 
       
   669 $$\bc_*(X; \pi^\infty_{\le n}(T)) \simeq \CM{X}{T}.$$
       
   670 \end{thm}
       
   671 
       
   672 This says that we can recover (up to homotopy) the space of maps to $T$ via blob homology from local data. 
       
   673 Note that there is no restriction on the connectivity of $T$ as there is for the corresponding result in topological chiral homology \cite[Theorem 3.8.6]{0911.0018}.
       
   674 \todo{sketch proof}
       
   675 
       
   676 
   666 \subsection{Structure of the blob complex}
   677 \subsection{Structure of the blob complex}
   667 \label{sec:structure}
   678 \label{sec:structure}
   668 
   679 
   669 In the following $\CH{X} = C_*(\Homeo(X))$ is the singular chain complex of the space of homeomorphisms of $X$, fixed on $\bdy X$.
   680 In the following $\CH{X} = C_*(\Homeo(X))$ is the singular chain complex of the space of homeomorphisms of $X$, fixed on $\bdy X$.
   670 
   681 
   697 \CH{X} \tensor \CH{X} \tensor \bc_*(X) \ar[r]^<<<<<{\id \tensor e_X} \ar[d]^{\compose \tensor \id} & \CH{X} \tensor \bc_*(X) \ar[d]^{e_X} \\
   708 \CH{X} \tensor \CH{X} \tensor \bc_*(X) \ar[r]^<<<<<{\id \tensor e_X} \ar[d]^{\compose \tensor \id} & \CH{X} \tensor \bc_*(X) \ar[d]^{e_X} \\
   698 \CH{X} \tensor \bc_*(X) \ar[r]^{e_X} & \bc_*(X)
   709 \CH{X} \tensor \bc_*(X) \ar[r]^{e_X} & \bc_*(X)
   699 }
   710 }
   700 \end{equation*}
   711 \end{equation*}
   701 \end{thm}
   712 \end{thm}
   702 
       
   703 \nn{if we need to save space, I think this next paragraph could be cut}
       
   704 Since the blob complex is functorial in the manifold $X$, this is equivalent to having chain maps
       
   705 $$ev_{X \to Y} : \CH{X \to Y} \tensor \bc_*(X) \to \bc_*(Y)$$
       
   706 for any homeomorphic pair $X$ and $Y$, 
       
   707 satisfying corresponding conditions.
       
   708 
   713 
   709 \begin{proof}(Sketch.)
   714 \begin{proof}(Sketch.)
   710 The most convenient way to prove this is to introduce yet another homotopy equivalent version of
   715 The most convenient way to prove this is to introduce yet another homotopy equivalent version of
   711 the blob complex, $\cB\cT_*(X)$.
   716 the blob complex, $\cB\cT_*(X)$.
   712 Blob diagrams have a natural topology, which is ignored by $\bc_*(X)$.
   717 Blob diagrams have a natural topology, which is ignored by $\bc_*(X)$.
   772 The statement can be generalized to arbitrary fibre bundles, and indeed to arbitrary maps
   777 The statement can be generalized to arbitrary fibre bundles, and indeed to arbitrary maps
   773 (see \cite[\S7.1]{1009.5025}).
   778 (see \cite[\S7.1]{1009.5025}).
   774 
   779 
   775 \nn{Theorem \ref{thm:product} is proved in \S \ref{ss:product-formula}, and Theorem \ref{thm:gluing} in \S \ref{sec:gluing}.}
   780 \nn{Theorem \ref{thm:product} is proved in \S \ref{ss:product-formula}, and Theorem \ref{thm:gluing} in \S \ref{sec:gluing}.}
   776 
   781 
   777 \section{Applications}
   782 \section{Higher Deligne conjecture}
   778 \label{sec:applications}
   783 \label{sec:applications}
   779 Finally, we give two applications of the above machinery.
       
   780 
       
   781 \begin{thm}[Mapping spaces]
       
   782 \label{thm:map-recon}
       
   783 Let $\pi^\infty_{\le n}(T)$ denote the $A_\infty$ $n$-category based on maps 
       
   784 $B^n \to T$.
       
   785 (The case $n=1$ is the usual $A_\infty$-category of paths in $T$.)
       
   786 Then 
       
   787 $$\bc_*(X; \pi^\infty_{\le n}(T)) \simeq \CM{X}{T}.$$
       
   788 \end{thm}
       
   789 
       
   790 This says that we can recover (up to homotopy) the space of maps to $T$ via blob homology from local data. 
       
   791 Note that there is no restriction on the connectivity of $T$ as there is for the corresponding result in topological chiral homology \cite[Theorem 3.8.6]{0911.0018}.
       
   792 \todo{sketch proof}
       
   793 
   784 
   794 \begin{thm}[Higher dimensional Deligne conjecture]
   785 \begin{thm}[Higher dimensional Deligne conjecture]
   795 \label{thm:deligne}
   786 \label{thm:deligne}
   796 The singular chains of the $n$-dimensional surgery cylinder operad act on blob cochains.
   787 The singular chains of the $n$-dimensional surgery cylinder operad act on blob cochains.
   797 Since the little $n{+}1$-balls operad is a suboperad of the $n$-SC operad,
   788 Since the little $n{+}1$-balls operad is a suboperad of the $n$-SC operad,
   843 Kevin Costello,
   834 Kevin Costello,
   844 Mike Freedman,
   835 Mike Freedman,
   845 Justin Roberts,
   836 Justin Roberts,
   846 and
   837 and
   847 Peter Teichner.
   838 Peter Teichner.
   848 \nn{not full list from big paper, but only most significant names}
       
   849 We also thank the Aspen Center for Physics for providing a pleasant and productive
   839 We also thank the Aspen Center for Physics for providing a pleasant and productive
   850 environment during the last stages of this project.
   840 environment during the last stages of this project.
   851 \end{acknowledgments}
   841 \end{acknowledgments}
   852 
   842 
   853 %% PNAS does not support submission of supporting .tex files such as BibTeX.
   843 %% PNAS does not support submission of supporting .tex files such as BibTeX.