<p>We show that the structure of an almost-commutative spectral triple emerges in a semi-classical limit from a geometric construction on a configuration space of gauge connections. The geometric construction resembles that of a spectral triple with a Dirac operator on the configuration space that interacts with the so-called <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\textbf{HD}\)</EquationSource> <EquationSource Format="MATHML"><math> <mi mathvariant="bold">HD</mi> </math></EquationSource> </InlineEquation>-algebra, which is an algebra of operator-valued functions on the configuration space, and which is generated by parallel transports along flows of vector fields on the underlying manifold. In a semi-classical limit, the <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\textbf{HD}\)</EquationSource> <EquationSource Format="MATHML"><math> <mi mathvariant="bold">HD</mi> </math></EquationSource> </InlineEquation>-algebra produces an almost-commutative algebra where the finite factor depends on the representation of the <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(\textbf{HD}\)</EquationSource> <EquationSource Format="MATHML"><math> <mi mathvariant="bold">HD</mi> </math></EquationSource> </InlineEquation>-algebra and on the point in the configuration space over which the semi-classical state is localized. Interestingly, we find that the Hilbert space, in which the almost-commutative algebra acts, comes with a double fermionic structure that resembles the fermionic doubling found in the noncommutative formulation of the standard model. Finally, the emerging almost-commutative algebra interacts with a spatial Dirac operator that emerges in the semi-classical limit. This interaction involves both factors of the almost-commutative algebra.</p>

错误:搜索内容不能为空,请输入英文关键词
错误:关键词超出字数限制,请精简
高级检索

On the emergence of an almost-commutative spectral triple from a geometric construction on a configuration space

  • Johannes Aastrup,
  • Jesper Møller Grimstrup

摘要

We show that the structure of an almost-commutative spectral triple emerges in a semi-classical limit from a geometric construction on a configuration space of gauge connections. The geometric construction resembles that of a spectral triple with a Dirac operator on the configuration space that interacts with the so-called \(\textbf{HD}\) HD -algebra, which is an algebra of operator-valued functions on the configuration space, and which is generated by parallel transports along flows of vector fields on the underlying manifold. In a semi-classical limit, the \(\textbf{HD}\) HD -algebra produces an almost-commutative algebra where the finite factor depends on the representation of the \(\textbf{HD}\) HD -algebra and on the point in the configuration space over which the semi-classical state is localized. Interestingly, we find that the Hilbert space, in which the almost-commutative algebra acts, comes with a double fermionic structure that resembles the fermionic doubling found in the noncommutative formulation of the standard model. Finally, the emerging almost-commutative algebra interacts with a spatial Dirac operator that emerges in the semi-classical limit. This interaction involves both factors of the almost-commutative algebra.