Daniel Baumann is a world-leading theoretical cosmologist. He obtained his doctorate from Princeton University in 2008, after which he was a postdoctoral researcher at Harvard University and the Institute for Advanced Study in Princeton. Since 2011, he has been a faculty member at Cambridge University, until he was appointed Professor of Theoretical Cosmology at the University of Amsterdam in 2015. Baumann has received numerous awards, including an ERC Starting Grant, an NWO VIDI Grant and a Jade Mountain Visiting Professorship at National Taiwan University. His cosmology lecture notes are used worldwide. He is the author of the book Inflation and String Theory (with Liam McAllister).

'A brilliant introduction to the most profound facts and ideas about the evolution of the universe, written by a young master of the field. Cosmology is a must-read for beginning students and active researchers alike.' Nima Arkani-Hamed, Professor, Institute for Advanced Study

• Preface; 1. Introduction; Part I. The Homogenous Universe: 2. The expanding universe; 3. The hot Big Bang; 4. Cosmological inflation; Part II. The Inhomogenous Universe: 5. Structure formation; 6. Relativistic perturbation theory; 7. Cosmic microwave background; 8. Quantum initial conditions; 9. Outlook; Appendices: Index.

Daniel Baumann is a world-leading theoretical cosmologist. He obtained his doctorate from Princeton University in 2008, after which he was a postdoctoral researcher at Harvard University and the Institute for Advanced Study in Princeton. Since 2011, he has been a faculty member at Cambridge University, until he was appointed Professor of Theoretical Cosmology at the University of Amsterdam in 2015. Baumann has received numerous awards, including an ERC Starting Grant, an NWO VIDI Grant and a Jade Mountain Visiting Professorship at National Taiwan University. His cosmology lecture notes are used worldwide. He is the author of the book Inflation and String Theory (with Liam McAllister).

'A brilliant introduction to the most profound facts and ideas about the evolution of the universe, written by a young master of the field. Cosmology is a must-read for beginning students and active researchers alike.' Nima Arkani-Hamed, Professor, Institute for Advanced Study

• Preface; 1. Introduction; Part I. The Homogenous Universe: 2. The expanding universe; 3. The hot Big Bang; 4. Cosmological inflation; Part II. The Inhomogenous Universe: 5. Structure formation; 6. Relativistic perturbation theory; 7. Cosmic microwave background; 8. Quantum initial conditions; 9. Outlook; Appendices: Index.

Daniel Baumann is a world-leading theoretical cosmologist. He obtained his doctorate from Princeton University in 2008, after which he was a postdoctoral researcher at Harvard University and the Institute for Advanced Study in Princeton. Since 2011, he has been a faculty member at Cambridge University, until he was appointed Professor of Theoretical Cosmology at the University of Amsterdam in 2015. Baumann has received numerous awards, including an ERC Starting Grant, an NWO VIDI Grant and a Jade Mountain Visiting Professorship at National Taiwan University. His cosmology lecture notes are used worldwide. He is the author of the book Inflation and String Theory (with Liam McAllister).

'A brilliant introduction to the most profound facts and ideas about the evolution of the universe, written by a young master of the field. Cosmology is a must-read for beginning students and active researchers alike.' Nima Arkani-Hamed, Professor, Institute for Advanced Study

• Preface; 1. Introduction; Part I. The Homogenous Universe: 2. The expanding universe; 3. The hot Big Bang; 4. Cosmological inflation; Part II. The Inhomogenous Universe: 5. Structure formation; 6. Relativistic perturbation theory; 7. Cosmic microwave background; 8. Quantum initial conditions; 9. Outlook; Appendices: Index.