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2.**Transversality:** The flux must be orthogonal to both the base and the fiber in a precise cohomological
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sense.
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2.**Transversality:** The flux must be orthogonal to both the base and the fiber in a precise cohomological sense.
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3. Additional constraints, such as **D3-tadpole cancellation**, **self-duality**, and **primitivity**, are also
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typically imposed. One often requires that the ``G_4``-flux preserves the non-abelian gauge symmetry encoded in
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the fibration.
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3. Additional constraints, such as **D3-tadpole cancellation**, **self-duality**, and **primitivity**, are also typically imposed. One often requires that the ``G_4``-flux preserves the non-abelian gauge symmetry encoded in the fibration.
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These conditions ensure compatibility with fundamental physical principles like anomaly cancellation and D3-brane
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@@ -28,15 +28,8 @@ following ingredients:
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- A **base space**``B``, over which the elliptic fibration is defined.
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- A **fiber ambient space**``F``, in which the elliptic fiber appears as a hypersurface.
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- Two divisor classes ``D_1`` and ``D_2`` in ``\text{Cl}(B)``, and a choice of two
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homogeneous coordinates of the fiber ambient space ``F``. These two coordinates transform
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over the base ``B`` as sections of the line bundles associated to ``D_1`` and ``D_2``,
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respectively. All remaining homogeneous coordinates of ``F`` transform as sections of the
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trivial line bundle over ``B``.
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- A hypersurface equation defining the total space of the elliptic fibration as a section
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of the anti-canonical bundle ``\overline{K}_A`` of the full ambient space ``A``, which
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combines both the fiber ambient space ``F`` and the base space ``B``. This ensures that
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the hypersurface equation is Calabi–Yau.
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- Two divisor classes ``D_1`` and ``D_2`` in ``\text{Cl}(B)``, and a choice of two homogeneous coordinates of the fiber ambient space ``F``. These two coordinates transform over the base ``B`` as sections of the line bundles associated to ``D_1`` and ``D_2``, respectively. All remaining homogeneous coordinates of ``F`` transform as sections of the trivial line bundle over ``B``.
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- A hypersurface equation defining the total space of the elliptic fibration as a section of the anti-canonical bundle ``\overline{K}_A`` of the full ambient space ``A``, which combines both the fiber ambient space ``F`` and the base space ``B``. This ensures that the hypersurface equation is Calabi–Yau.
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It is worth noting that any elliptic fibration, for which the fiber ambient space is toric,
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can be cast into this form [KM-POPR15](@cite). Consequently, this approach allows for a
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@@ -226,13 +226,8 @@ In F-theory, the standard approach to handling singular geometries is to replace
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**crepant resolutions**. This process preserves the Calabi–Yau condition and ensures the correct encoding of physical
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data. However, several important caveats apply:
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- Not all singularities admit crepant resolutions, rather some singularities are obstructed from being resolved without
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violating the Calabi–Yau condition. No algorithm is known to the authors that determines whether a given singularity
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admits a crepant resolution.
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- Likewise, no general algorithm is known for computing a crepant resolution of a given singular geometry. In practice,
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one applies all known resolution techniques, guided by mathematical structure and physical expectations. A particularly
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prominent strategy is a sequence of **blowups**. We discuss the available blowup functionality in
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[Functionality for all F-theory models](@ref).
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- Not all singularities admit crepant resolutions, rather some singularities are obstructed from being resolved without violating the Calabi–Yau condition. No algorithm is known to the authors that determines whether a given singularity admits a crepant resolution.
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- Likewise, no general algorithm is known for computing a crepant resolution of a given singular geometry. In practice, one applies all known resolution techniques, guided by mathematical structure and physical expectations. A particularly prominent strategy is a sequence of **blowups**. We discuss the available blowup functionality in [Functionality for all F-theory models](@ref).
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After applying a resolution strategy, one obtains a **partially resolved** model. For the reasons stated above, OSCAR
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does not currently verify whether the model has been fully resolved—i.e., whether all resolvable singularities have been
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@@ -206,13 +206,8 @@ In F-theory, the standard approach to handling singular geometries is to replace
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via **crepant resolutions**. This process preserves the Calabi–Yau condition and ensures the correct encoding
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of physical data. However, several important caveats apply:
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- Not all singularities admit crepant resolutions, rather some singularities are obstructed from being resolved
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without violating the Calabi–Yau condition. No algorithm is known to the authors that determines whether a
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given singularity admits a crepant resolution.
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- Likewise, no general algorithm is known for computing a crepant resolution of a given singular geometry.
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In practice, one applies all known resolution techniques, guided by mathematical structure and physical
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expectations. A particularly prominent strategy is a sequence of **blowups**. We discuss the available blowup
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functionality in [Functionality for all F-theory models](@ref).
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- Not all singularities admit crepant resolutions, rather some singularities are obstructed from being resolved without violating the Calabi–Yau condition. No algorithm is known to the authors that determines whether a given singularity admits a crepant resolution.
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- Likewise, no general algorithm is known for computing a crepant resolution of a given singular geometry. In practice, one applies all known resolution techniques, guided by mathematical structure and physical expectations. A particularly prominent strategy is a sequence of **blowups**. We discuss the available blowup functionality in [Functionality for all F-theory models](@ref).
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After applying a resolution strategy, one obtains a **partially resolved** model. For the reasons stated above,
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OSCAR does not currently verify whether the model has been fully resolved—i.e., whether all resolvable
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@@ -10,7 +10,7 @@ identify ambient space candidates of G4-fluxes. In terms of these
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candidates, we can define a family of G4-fluxes as:
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- ``\mathbb{Z}``-linear combinations, provided by a matrix ``\text{mat}_{\text{int}}``,
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- ``\mathbb{Q}``-linear combinations, provided by a matrix ``\text{mat}_{\text{rat}}``,
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- a shift ``---``resembling the appearance of ``\frac{1}{2} \cdot c_2`` in the flux quantization condition``---`` provided by a vector ``\text{offset}``.
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- a shift—resembling the appearance of ``\frac{1}{2} \cdot c_2`` in the flux quantization condition—provided by a vector ``\text{offset}``.
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For convenience we also allow to only provide ``\text{mat}_{\text{int}}``or ``\text{mat}_{\text{rat}}``. In this case, the shift is taken to be zero.
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