**Office Location:** 244 Physics Bldg, Durham, NC 27708**Office Phone:** (919) 660-2874**Email Address:** psa@cgtp.duke.edu**Web Page:** http://www.cgtp.duke.edu/~psa

**Specialties:**

Mathematical Physics

Geometry

**Education:**

Theoretical Elementary Particle Physics, Oxford, 1991

Ph.D., University of Oxford (UK), 1985

B.A., University of Oxford (UK), 1985

**Research Categories:** *String Theory*

**Research Description:**

String theory is hoped to provide a theory of all fundamental physics encompassing both quantum mechanics and general relativity. String theories naturally live in a large number of dimensions and so to make contact with the real world it is necessary to ``compactify'' the extra dimensions on some small compact space. Understanding the physics of the real world then becomes a problem very closely tied to understanding the geometry of the space on which one has compactified. In particular, when one restricts one's attention to ``supersymmetric'' physics the subject of algebraic geometry becomes particularly important.

Of current interest is the notion of ``duality''. Here one obtains the same physics by compactifying two different string theories in two different ways. Now one may use our limited understanding of one picture to fill in the gaps in our limited knowledge of the second picture. This appears to be an extremely powerful method of understanding a great deal of string theory.

Both mathematics and physics appear to benefit greatly from duality. In mathematics one finds hitherto unexpected connections between the geometry of different spaces. ``Mirror symmetry'' was an example of this but many more remain to be explored. On the physics side one hopes to obtain a better understanding of nonperturbative aspects of the way string theory describes the real world.

**Areas of Interest:**

String Theory

Calabi-Yau Manifolds

D-Branes

Duality

**Teaching (Spring 2016):**

- Math 612.01,
*Algebraic topology ii*Synopsis- Physics 227, TuTh 01:25 PM-02:40 PM

**Recent Publications**
(More Publications)

- PS Aspinwall,
*Exoflops in two dimensions*, Journal of High Energy Physics, vol. 2015 no. 7 (July, Preprint, 2015) [arXiv:1412.0612], [doi] . - PS Aspinwall and B Gaines,
*Rational curves and (0, 2)-deformations*, Journal of Geometry and Physics, vol. 88 (February, Accepted, 2015), pp. 1-15 [arXiv:1404.7802], [doi] . - PS Aspinwall,
*Some applications of commutative algebra to string theory*, in Commutative Algebra: Expository Papers Dedicated to David Eisenbud on the Occasion of His 65th Birthday, scopus (2013), pp. 25-56 [doi] [abs]. - N Addington and PS Aspinwall,
*Categories of Massless D-Branes and del Pezzo Surfaces*, arxiv, vol. 2013 no. 176 (May, 2013) [1305.5767v2], [doi] [abs]. - P.S. Aspinwall and M.R. Plesser,
*Elusive Worldsheet Instantons in Heterotic String Compactifications*, in Proceedings of Symposia in Pure Mathematics, vol. 85 (2012), pp. 33-52 [1106.2998] .

**Highlight:**

String theory is hoped to provide a theory of all fundamental physics encompassing both quantum mechanics and general relativity. String theories naturally live in a large number of dimensions and so to make contact with the real world it is necessary to ``compactify'' the extra dimensions on some small compact space. Understanding the physics of the real world then becomes a problem very closely tied to understanding the geometry of the space on which one has compactified. In particular, when one restricts one's attention to ``supersymmetric'' physics the subject of algebraic geometry becomes particularly important.

Of current interest is the notion of ``duality''. Here one obtains the same physics by compactifying two different string theories in two different ways. Now one may use our limited understanding of one picture to fill in the gaps in our limited knowledge of the second picture. This appears to be an extremely powerful method of understanding a great deal of string theory.

Both mathematics and physics appear to benefit greatly from duality. In mathematics one finds hitherto unexpected connections between the geometry of different spaces. ``Mirror symmetry'' was an example of this but many more remain to be explored. On the physics side one hopes to obtain a better understanding of nonperturbative aspects of the way string theory describes the real world.

**Current Ph.D. Students**(Former Students)- Brian Fitzpatrick
- Kangkang Wang
- Benjamin Gaines

**Postdocs Mentored**- Nicolas Addington (August, 2012 - present)
- Stefano Guerra (September, 2007 - August, 2010)
- Robert Duivenvoorden (July, 2005 - August 30, 2006)
- K. Narayan (September 1, 2002 - August 30, 2004)
- Eric Sharpe (1998/09-2001/09)