# Physics

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:Full name: `pylith.problems.Physics`
:Journal name: `physics`

Abstract base class for objects defining physics.

## Pyre Facilities

* `auxiliary_subfields`: Discretization information for auxiliary subfields.
  - **current value**: 'emptybin', from {default}
  - **configurable as**: emptybin, auxiliary_subfields
* `db_auxiliary_field`: Database for physical property parameters.
  - **current value**: 'simpledb', from {default}
  - **configurable as**: simpledb, db_auxiliary_field
* `derived_subfields`: Discretization of derived subfields.
  - **current value**: 'emptybin', from {default}
  - **configurable as**: emptybin, derived_subfields
* `observers`: Observers (e.g., output).
  - **current value**: 'singlephysicsobserver', from {default}
  - **configurable as**: singlephysicsobserver, observers