Workshop on High Energy Physics Phenomenology (WHEPP XI) Astroparticle Physics and Cosmology (WG1) Coordinators: Raghavan Rangarajan [raghavan@prl.res.in] Ajit Mohan Srivastava [ajit@iopb.res.in] WG Themes 1. Dark Energy 2. Electroweak Phase Transition and Cosmology 3. Inflation 4. Dark Matter