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Elementary question about the fibration structure of a toric CY 3-fold

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I've been trying to reconcile two seemingly different definitions of what a toric space is, specifically a toric Calabi-Yau 3-fold. The first definition is from the paper ``Branes and Toric Geometry,'' by Leung and Vafa (arXiv:hep-th/9711013) who say (on page 12, section 2.1):

We are interested in manifolds admitting a $T^n$ action, with an n-dimensional base.

This seems to suggest that a toric Calabi-Yau 3-fold (generalizing the construction in the paper) is a $T^3$ fibration over a real 3-dimensional base.

However, in the thesis ``Crystal Melting and Wall Crossing Phenomena," by Yamazaki (arXiv:1002.1709 [hep-th]), the author explicitly says (on page 16, in section 3.2):

A toric Calabi-Yau threefold $X_Delta$ is a $T^2 times mathbbR$ fibration over $mathbbR^3$, where the fibers are special Lagrangian submanifolds.

Now I understand that the phrase "special Lagrangian submanifold" implies the existence in $X_Delta$ of a special Lagrangian submanifold. But I would like to know the sense in which these two seemingly different definitions are equivalent. Any references to a further discussion about toric spaces would is very welcome! (I am a physicist learning about the underlying mathematical structures. I would not like to shy away from the formal definitions, so math references are particularly welcome.)

algebraic-geometry complex-geometry toric-geometry string-theory

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asked 2 days ago

leastactionleastaction

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$begingroup$

I've been trying to reconcile two seemingly different definitions of what a toric space is, specifically a toric Calabi-Yau 3-fold. The first definition is from the paper ``Branes and Toric Geometry,'' by Leung and Vafa (arXiv:hep-th/9711013) who say (on page 12, section 2.1):

We are interested in manifolds admitting a $T^n$ action, with an n-dimensional base.

This seems to suggest that a toric Calabi-Yau 3-fold (generalizing the construction in the paper) is a $T^3$ fibration over a real 3-dimensional base.

However, in the thesis ``Crystal Melting and Wall Crossing Phenomena," by Yamazaki (arXiv:1002.1709 [hep-th]), the author explicitly says (on page 16, in section 3.2):

A toric Calabi-Yau threefold $X_Delta$ is a $T^2 times mathbbR$ fibration over $mathbbR^3$, where the fibers are special Lagrangian submanifolds.

Now I understand that the phrase "special Lagrangian submanifold" implies the existence in $X_Delta$ of a special Lagrangian submanifold. But I would like to know the sense in which these two seemingly different definitions are equivalent. Any references to a further discussion about toric spaces would is very welcome! (I am a physicist learning about the underlying mathematical structures. I would not like to shy away from the formal definitions, so math references are particularly welcome.)

algebraic-geometry complex-geometry toric-geometry string-theory

share|cite|improve this question

asked 2 days ago

leastactionleastaction

278111

$endgroup$

add a comment | 

$begingroup$

I've been trying to reconcile two seemingly different definitions of what a toric space is, specifically a toric Calabi-Yau 3-fold. The first definition is from the paper ``Branes and Toric Geometry,'' by Leung and Vafa (arXiv:hep-th/9711013) who say (on page 12, section 2.1):

We are interested in manifolds admitting a $T^n$ action, with an n-dimensional base.

This seems to suggest that a toric Calabi-Yau 3-fold (generalizing the construction in the paper) is a $T^3$ fibration over a real 3-dimensional base.

However, in the thesis ``Crystal Melting and Wall Crossing Phenomena," by Yamazaki (arXiv:1002.1709 [hep-th]), the author explicitly says (on page 16, in section 3.2):

A toric Calabi-Yau threefold $X_Delta$ is a $T^2 times mathbbR$ fibration over $mathbbR^3$, where the fibers are special Lagrangian submanifolds.

Now I understand that the phrase "special Lagrangian submanifold" implies the existence in $X_Delta$ of a special Lagrangian submanifold. But I would like to know the sense in which these two seemingly different definitions are equivalent. Any references to a further discussion about toric spaces would is very welcome! (I am a physicist learning about the underlying mathematical structures. I would not like to shy away from the formal definitions, so math references are particularly welcome.)

algebraic-geometry complex-geometry toric-geometry string-theory

share|cite|improve this question

asked 2 days ago

leastactionleastaction

278111

$endgroup$

share|cite|improve this question

asked 2 days ago

leastactionleastaction

278111

share|cite|improve this question

asked 2 days ago

leastactionleastaction

278111

asked 2 days ago

leastactionleastaction

278111

asked 2 days ago

leastactionleastaction

278111