2.1k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Centre National de la Recherche ScientifiqueFR835 papers
- Université de MontpellierFR706 papers
- Université Montpellier 2143 papers
- Institut Universitaire de FranceFR119 papers
- Sorbonne UniversitéFR55 papers
- Commissariat à l'Énergie Atomique et aux Énergies AlternativesFR54 papers
- Université Paris-SaclayFR52 papers
- Université Grenoble AlpesFR51 papers
- University of CambridgeGB45 papers
- École Normale Supérieure - PSLFR43 papers
- Université Paris Sciences et LettresFR34 papers
- Université Paris CitéFR33 papers
58 papers · 1 filter
Multi-instantons in 2d string theory
Sergei Alexandrov, Rishabh Kaushik
Instanton contributions in 2d string theory are known to include subtle numerical factors closely related to a contour prescription in multi-instanton string amplitudes. Both…
Quantum TBA for refined BPS indices
Sergei Alexandrov, Khalil Bendriss
Refined BPS indices give rise to a quantum Riemann-Hilbert problem that is inherently related to a non-commutative deformation of moduli spaces arising in gauge and string theory c…
Mock modularity at work, or black holes in a forest
Sergei Alexandrov
Mock modular forms, first invented by Ramanujan, provide a beautiful generalization of the usual modular forms. In recent years, it was found that they capture generating functions…
Mock modularity of Calabi-Yau threefolds
Sergei Alexandrov, Khalil Bendriss
Generating functions of D4-D2-D0 BPS indices, appearing in Calabi-Yau compactifications of type IIA string theory and identical to rank 0 Donaldson-Thomas invariants, are…
Modular anomaly of BPS black holes
Sergei Alexandrov, Khalil Bendriss
Generating functions of BPS indices, counting states of D4-D2-D0 black holes in Calabi-Yau compactifications of type IIA string theory and identified with rank 0 Donaldson- Thomas…
Quantum geometry and mock modularity
Sergei Alexandrov, Soheyla Feyzbakhsh, Albrecht Klemm +1
In previous work, we used new mathematical relations between Gopakumar-Vafa (GV) invariants and rank 0 Donaldson-Thomas (DT) invariants to determine the first few terms in the gene…
Instantons in sine-Liouville theory
Sergei Alexandrov, Raghu Mahajan, Ashoke Sen
We compute instanton corrections to the partition function of sine-Liouville (SL) theory, which provides a worldsheet description of two-dimensional string theory in a non-trivial…
Resurgence of Refined Topological Strings and Dual Partition Functions
Sergey Alexandrov, Marcos Mariño, Boris Pioline
We study the resurgent structure of the refined topological string partition function on a non-compact Calabi-Yau threefold, at large orders in the string coupling constant a…
Hypermultiplet metric and NS5-instantons
Sergei Alexandrov, Khalil Bendriss
The metric on the hypermultiplet moduli space of Calabi-Yau compactifications of type II string theory is known to receive D-brane and NS5-brane instanton corrections. We compute e…
Phase transitions and light scalars in bottom-up holography
Daniel Elander, Ali Fatemiabhari, Maurizio Piai
Within the bottom-up approach to holography, we construct a class of six-dimensional gravity models, and discuss solutions that can be interpreted, asymptotically in the far UV, in…
D-instanton Induced Superpotential
Sergei Alexandrov, Atakan Hilmi Fırat, Manki Kim +2
We use string field theory to fix the normalization of the D-instanton corrections to the superpotential involving the moduli fields of type II string theory compactified on an ori…
Modular bootstrap for D4-D2-D0 indices on compact Calabi-Yau threefolds
Sergei Alexandrov, Nava Gaddam, Jan Manschot +1
We investigate the modularity constraints on the generating series of BPS indices counting D4-D2-D0 bound states with fixed D4-brane charge in type IIA string theory c…
Euclidean D-branes in Type IIB string theory on Calabi-Yau threefolds
Sergei Alexandrov, Ashoke Sen, Bogdan Stefański
We compute the contribution of Euclidean D-branes in type IIB string theory on Calabi-Yau threefolds to the metric on the hypermultiplet moduli space in the large volume, weak coup…
Towards top-down holographic composite Higgs: minimal coset from maximal supergravity
Daniel Elander, Maurizio Piai
Within the context of top-down holography, we study a one-parameter family of regular background solutions of maximal gauged supergravity in seven dimensions, dimensionally reduced…
D-instantons in Type IIA string theory on Calabi-Yau threefolds
Sergei Alexandrov, Ashoke Sen, Bogdan Stefański
Type IIA string theory compactified on a Calabi-Yau threefold has a hypermultiplet moduli space whose metric is known to receive non-perturbative corrections from Euclidean D2-bran…
Conformal TBA for resolved conifolds
Sergei Alexandrov, Boris Pioline
We revisit the Riemann-Hilbert problem determined by Donaldson-Thomas invariants for the resolved conifold and for other small crepant resolutions. While this problem can be recast…
Heavenly metrics, BPS indices and twistors
Sergei Alexandrov, Boris Pioline
Recently T. Bridgeland defined a complex hyperkähler metric on the tangent bundle over the space of stability conditions of a triangulated category, based on a Riemann-Hilbert prob…
The Coulomb branch of N=4 SYM and dilatonic scions in supergravity
Daniel Elander, Maurizio Piai, John Roughley
We find a parametrically light dilaton in special confining theories in three dimensions. Their duals form what we call a scion of solutions to the supergravity associated with the…
A light dilaton in a metastable vacuum
Daniel Elander, Maurizio Piai, John Roughley
We identify a parametrically light dilaton by studying the perturbations of metastable vacua along a branch of regular supergravity backgrounds that are dual to four-dimensional co…
Refinement and modularity of immortal dyons
Sergei Alexandrov, Suresh Nampuri
Extending recent results in string compactifications, we propose that the holomorphic anomaly equation satisfied by the modular completions of the generating functions…
Dilatonic states near holographic phase transitions
Daniel Elander, Maurizio Piai, John Roughley
The spectrum of bound states of special strongly coupled confining field theories might include a parametrically light dilaton, associated with the formation of enhanced condensate…
Rank Vafa-Witten invariants, modularity and blow-up
Sergei Alexandrov
We derive explicit expressions for the generating functions of refined Vafa-Witten invariants of of arbitrary rank and for their non-holomorphic modular…
Vafa-Witten invariants from modular anomaly
Sergei Alexandrov
Recently, a universal formula for a non-holomorphic modular completion of the generating functions of refined BPS indices in various theories with supersymmetry has been sugg…
Probing the holographic dilaton
Daniel Elander, Maurizio Piai, John Roughley
Many strongly coupled field theories admit a spectrum of gauge-invariant bound states that includes scalar particles with the same quantum numbers as the vacuum. The challenge natu…