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| Nemanja Kaloper | |
|---|---|
| Name | Nemanja Kaloper |
| Birth place | Belgrade, Serbia |
| Nationality | Serbian-American |
| Fields | Theoretical physics, Cosmology, General relativity, String theory |
| Workplaces | UC Berkeley, University of California, Davis, CERN, Stanford University |
| Alma mater | University of Belgrade, Princeton University |
| Doctoral advisor | Philip Candelas |
| Known for | Contributions to inflationary cosmology, extra dimensions, black hole thermodynamics, massive gravity |
Nemanja Kaloper is a theoretical physicist known for contributions to cosmic inflation, string theory, and modifications of general relativity. His work spans topics from early-universe cosmology and brane cosmology to investigations of quantum effects in curved spacetime and proposals for infrared modifications of gravity. Kaloper has held appointments at major research centers and collaborated with prominent theorists on issues connecting particle physics with cosmological observations.
Kaloper was born in Belgrade and completed undergraduate studies at the University of Belgrade before moving to the United States for graduate work. He earned a Ph.D. in theoretical physics at Princeton University under the supervision of Philip Candelas, engaging with problems in string theory and compactification. During his doctoral and postdoctoral years he spent time at research institutes including CERN, where interactions with researchers from Cambridge University and Harvard University shaped his early focus on cosmological aspects of high-energy theory.
Kaloper has held faculty and research positions at institutions across North America and Europe. He served on the faculty at the University of California, Davis and held visiting appointments at Stanford University and UC Berkeley. He has been affiliated with major research laboratories and collaborations at CERN and participated in programs organized by institutes such as the Perimeter Institute and the Institute for Advanced Study. Kaloper has taught graduate courses relating to general relativity, quantum field theory, and cosmology while advising doctoral students and postdoctoral researchers who later joined groups at Princeton University, MIT, and Caltech.
Kaloper's research has addressed foundational problems in cosmology and high-energy physics. He is known for work on models of cosmic inflation that draw on ideas from string theory and brane cosmology, including studies of axion monodromy and multi-field inflation inspired by constructions in type IIB string theory and F-theory. Kaloper contributed to understanding the role of higher-dimensional scenarios motivated by Kaluza–Klein theory and examined cosmological signatures of warped compactifications akin to those in Randall–Sundrum models.
His investigations of infrared modifications of general relativity explored massive graviton scenarios and ghost-free constructions related to the de Rham–Gabadadze–Tolley (dRGT) theory. Kaloper analyzed cosmological solutions in massive gravity and their implications for late-time acceleration, interacting with work by Claudia de Rham, G. Gabadadze, and Andrew Tolley. He studied the interplay between vacuum energy, tuning problems exemplified by the cosmological constant problem, and mechanisms like sequestering that seek to ameliorate fine-tuning.
Kaloper also examined quantum effects in curved spacetime, contributing to debates about black hole thermodynamics originating from insights by Stephen Hawking and Jacob Bekenstein. His research on particle production, backreaction, and the robustness of semiclassical approximations informed discussions connecting quantum field theory in curved spacetime with observational aspects of the cosmic microwave background investigated by collaborations such as Planck and WMAP.
Collaborations with theorists such as Antonio Padilla, Ruth Gregory, and David N. Spergel led to cross-disciplinary outputs tying model-building to phenomenological constraints from Large Hadron Collider searches and cosmological surveys conducted by projects like BOSS and DES.
Kaloper has received fellowships and recognition from national and international bodies. He was awarded competitive postdoctoral fellowships and research grants from agencies including the National Science Foundation and participated in prize committees and advisory panels at institutions such as the Perimeter Institute and Kavli Institute for Theoretical Physics. He gave invited plenary and keynote talks at conferences organized by societies including the American Physical Society and the International Centre for Theoretical Physics.
- "Field-theoretic models of inflation and reheating" — article with connections to axion inflation and reheating phenomenology appearing in major journals, coauthored with collaborators from Oxford and Columbia University. - "Sequestering the cosmological constant" — work building on ideas addressing the cosmological constant problem and vacuum energy contributions, cited alongside research by Nima Arkani-Hamed and Erik Verlinde. - "Massive gravity and cosmology" — series of papers analyzing cosmological backgrounds in ghost-free massive gravity, interacting with the literature by Claudia de Rham and Gregory Gabadadze. - "Axion monodromy and inflationary signatures" — contributions to model proposals linking string compactification features to observable imprints in the cosmic microwave background experiments like Planck. (Representative selection; Kaloper's corpus includes articles in leading journals and proceedings associated with CERN and national laboratories.)
Kaloper maintains collaborations across academic networks in Europe and North America, contributing to workshops at the Perimeter Institute and seminars at Princeton University and Harvard University. He serves on advisory boards and participates in peer review for journals overseen by organizations such as the American Physical Society and funding panels for the National Science Foundation. Outside academia, he has engaged in public lectures and outreach events co-organized with institutions like the Royal Society and regional science centers.
Category:Serbian physicists Category:Theoretical physicists Category:Cosmologists