Publications

2026

  1. SIGIR
    Agentic Search in the Wild: Intents and Trajectory Dynamics from 14M+ Real Search Requests
    Jingjie Ning*, João Coelho*, Yibo Kong*, and 5 more authors
    Proceedings of the International ACM SIGIR Conference on Research and Development in Information Retrieval, 2026
    arXiv HTML
  2. ICTIR
    DeepResearchGym: A Free, Transparent, and Reproducible Sandbox for Deep Research
    João Coelho, Jingjie Ning, Jingyuan He, and 8 more authors
    Proceedings of the ACM SIGIR Conference on Innovative Concepts and Theories in Information Retrieval, 2026
    arXiv
  3. arXiv
    Effective Reinforcement Learning for Agentic Search by Recycling Zero-Variance Queries During Training
    João Coelho, João Magalhães, Bruno Martins, and 1 more author
    arXiv preprint (under review), 2026
    arXiv
  4. arXiv
    Beyond Parallel Sampling: Diverse Query Initialization for Agentic Search
    Sidhaarth Murali, João Coelho, Jingjie Ning, and 3 more authors
    arXiv preprint (under review), 2026
    arXiv
  5. arXiv
    Learning Multi-Step Query Rewriting via Corpus Feedback for Conversational Search
    João Coelho, Hong Wang, Jie Yuan, and 3 more authors
    arXiv preprint (under review), 2026
    arXiv

2025

  1. SIGIR
    Aligning Web Query Generation with Ranking Objectives via Direct Preference Optimization
    João Coelho, Bruno Martins, João Magalhães, and 1 more author
    Proceedings of the International ACM SIGIR Conference on Research and Development in Information Retrieval, 2025
    arXiv HTML

2024

  1. ACL
    Dwell in the Beginning: How Language Models Embed Long Documents for Dense Retrieval
    João Coelho, Bruno Martins, João Magalhães, and 2 more authors
    Proceedings of the Annual Meeting of the Association for Computational Linguistics, 2024
    HTML

2023

  1. EAAI
    Semantic Similarity for Mobile Application Recommendation under Scarce User Data
    João Coelho, Beatriz Paula, Diogo Mano, and 4 more authors
    Engineering Applications of Artificial Intelligence, 2023
    HTML

2022

  1. ICE/ITMC
    Collaborative filtering for mobile application recommendation with implicit feedback
    Beatriz Paula, João Coelho, Diogo Mano, and 4 more authors
    Proceedings of the IEEE ICE/ITMC Conference, 2022

2021

  1. SLATE
    Semantic Search of Mobile Applications using Word Embeddings
    João Coelho, António Neto, Miguel Tavares, and 4 more authors
    Proceedings of the Symposium on Languages, Applications and Technologies, 2021
  2. KDIR
    Transformer-based Language Models for Semantic Search and Mobile Applications Retrieval
    João Coelho, António Neto, Miguel Tavares, and 4 more authors
    Proceedings of the International Joint Conference on Knowledge Discovery and Information Retrieval, 2021
  3. SIGSPATIAL
    Improving Neural Models for the Retrieval of Relevant Passages to Geographical Queries
    João Coelho, João Magalhães, and Bruno Martins
    Proceedings of the ACM SIGSPATIAL International Conference on Advances in Geographic Information Systems, 2021
    HTML