Prof. Dr. Gavril Farkas forscht schwerpunktmäßig auf dem Gebiet der algebraischen Geometrie, insbesondere zur birationalen Geometrie von Modulräumen von Kurven, Syzygien und Koszul-Moduln. Seine Arbeit verbindet tiefe mathematische Theorie mit Anwendungen in der arithmetischen Geometrie und der theoretischen Physik, einschließlich der Stringtheorie und Quantenfeldtheorie. Er nutzt computeralgebraische Methoden und numerische Simulationen, um komplexe geometrische Strukturen zu klassifizieren und Invarianten zu berechnen. Seine Forschung ist stark interdisziplinär ausgerichtet und trägt zur mathematischen Grundlagenforschung bei, indem sie Brücken zwischen Geometrie, Topologie und Physik schlägt.
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Prof. Dr. Gavril Farkas
HU-FIS-Profil ↗Geometry Beyond the Torelli Map: Families, Sygyzies, and Special Subvarieties
foundation
EXC 2046/2: Berlin Mathematics Research Center (MATH+)
university
GRK 2965/1: „Von Geometrie zu Zahlen: Moduli, Hodge Theorie, rationale Punkte“
university
Förderer: DFG Sonderforschungsbereich Zeitraum: 01/2005 - 06/2009 Projektleitung: Prof. Dr. Gavril Farkas
Förderer: DFG Sonderforschungsbereich Zeitraum: 01/2009 - 12/2016 Projektleitung: Prof. Dr. Gavril Farkas
Förderer: DFG Sachbeihilfe Zeitraum: 07/2010 - 06/2013 Projektleitung: Prof. Dr. Gavril Farkas
American Journal of Mathematics · DOI
Given a moduli space, how can one construct the ``best'' (in the sense of higher dimensional algebraic geometry) effective divisor on it? We show that, at least in the case of the moduli space of curves, the answer is provided by the Koszul divisor defined in terms of the syzygies of the parameterized objects. In this paper, we find a formula for the slopes of all Koszul divisors on $\overline{{\cal M}}_g$. In particular, we obtain the first infinite series of counterexamples to the Harris-Morrison Slope Conjecture and we prove the Maximal Rank Conjecture in the case when the Brill-Noether number of the corresponding linear series equals~$0$. We also find shorter proofs for the formulas of the class of the Brill-Noether and Gieseker-Petri divisors. Finally, we improve most of Logan's results on the Kodaira dimension of the moduli spaces $\overline{{\cal M}}_{g, n}$ of pointed stable curves.
Journal of the European Mathematical Society · DOI
We study the enumerative geometry of the moduli space \mathcal R_g of Prym varieties of dimension g–1 . Our main result is that the compactication of \mathcal R_g is of general type as soon as g > 13 and g is different from 15 . We achieve this by computing the class of two types of cycles on \mathcal R_g : one defined in terms of Koszul cohomology of Prym curves, the other defined in terms of Raynaud theta divisors associated to certain vector bundles on curves. We formulate a Prym–Green conjecture on syzygies of Prym-canonical curves. We also perform a detailed study of the singularities of the Prym moduli space, and show that for g ≥4 , pluricanonical forms extend to any desingularization of the moduli space.
Journal of Algebraic Geometry · DOI
We compute the class of the compactification of the divisor of curves sitting on a <inline-formula content-type="math/mathml"> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="upper K Baseline 3"> <mml:semantics> <mml:mrow> <mml:mi>K</mml:mi> <mml:mn>3</mml:mn> </mml:mrow> <mml:annotation encoding="application/x-tex">K3</mml:annotation> </mml:semantics> </mml:math> </inline-formula> surface and show that it violates the Harris-Morrison Slope Conjecture. We carry this out using the fact that this divisor has four distinct incarnations as a geometric subvariety of the moduli space of curves. We also give a counterexample to a hypothesis raised by Harris and Morrison that the Brill-Noether divisors are essentially the only effective divisors on the moduli space of curves having minimal slope <inline-formula content-type="math/mathml"> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="6 plus 12 slash left-parenthesis g plus 1 right-parenthesis"> <mml:semantics> <mml:mrow> <mml:mn>6</mml:mn> <mml:mo>+</mml:mo> <mml:mn>12</mml:mn> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:mo>/</mml:mo> </mml:mrow> <mml:mo stretchy="false">(</mml:mo> <mml:mi>g</mml:mi> <mml:mo>+</mml:mo> <mml:mn>1</mml:mn> <mml:mo stretchy="false">)</mml:mo> </mml:mrow> <mml:annotation encoding="application/x-tex">6+12/(g+1)</mml:annotation> </mml:semantics> </mml:math> </inline-formula> .