{"id":{"repo_id":"buffalo","oai_identifier":"oai:ubir.buffalo.edu:10477/80897"},"canonical_url":"https://search.dev.ndltd.org/etd/buffalo/oai:ubir.buffalo.edu:10477/80897","repository":{"repo_id":"buffalo","name":"Buffalo","base_url":"https://ubir.buffalo.edu/oai/request"},"display":{"title":"Strong Gravity: Signatures of New Possibilities","abstract":"Ph.D.","abstract_html":"Ph.D.","abstract_has_math":false,"creators":["Dong, Ruifeng; 0000-0001-6364-5250"],"institution":"State University of New York at Buffalo","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":["Stojkovic, Dejan","Physics"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2019,"date_issued":"2019-10-29T16:47:57Z","date_published":"2019-10-29T16:47:57Z","updated_at":"2026-07-27T19:05:25Z","subjects":["theoretical physics","physics","astrophysics"],"languages":["eng"],"rights":["Users of works found in University at Buffalo Institutional Repository (UBIR) are responsible for identifying and contacting the copyright owner for permission to reuse. University at Buffalo Libraries do not manage rights for copyright-protected works and cannot assist with permissions.","Copyright retained by author."],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/10477/80897","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Stojkovic, Dejan","Physics"]},{"key":"dc:creator","label":"Author","values":["Dong, Ruifeng; 0000-0001-6364-5250"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2019-10-29T16:47:57Z","2019","2019-08-08 11:24:46"]},{"key":"dc:publisher","label":"Institution","values":["State University of New York at Buffalo"]},{"key":"dc:type","label":"Dc Type","values":["Text","Dissertation"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["theoretical physics","physics","astrophysics"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Users of works found in University at Buffalo Institutional Repository (UBIR) are responsible for identifying and contacting the copyright owner for permission to reuse. University at Buffalo Libraries do not manage rights for copyright-protected works and cannot assist with permissions.","Copyright retained by author."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/10477/80897"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Ph.D.","Gravity leaves traces for us to explore. Newton's apple has evolved into various forms over the past 340 years. On the observational side: celestial motions of the planets, the precession of the Mercury's perihelion, the cosmic microwave background, the late-time accelerated expansion of the universe, etc. On the theoretical side: the existence of black holes, the three paradoxes in standard cosmology, Hawking radiation, information paradox, etc. Meanwhile, we are being led toward a perfect theory, if it exists, of gravity.In this thesis, I concentrate on the traces of gravity theories both in experiments and theory. Inspired by the symmetron model of gravity, I construct a new model of inflation. In this model, the inflaton field has an effective potential which changes the form when the environment changes. Before inflation, the universe is dense, the potential has U-shape and the inflaton rests at its minimum in equilibrium. With the cosmic expansion, when the universe is dilute enough, the effective potential changes to the symmetry-breaking form, forcing the inflaton to roll down. Based on a concrete two-field model of the universe, I solve the field equations of motion coupled with the Friedmann equation. The model successfully solves the initial-condition problem in inflation and produces a power spectrum of primordial perturbations, consistent with recent observations.The black hole is a prediction of most gravity theories. If they form in the early universe, their evaporation would leave a stochastic gravitational-wave signal today. I compute the Hawking radiation of gravitons from these black holes as well as their cosmological evolution and obtain the energy spectrum of the gravitational waves to be expected at the detectors today."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Strong Gravity: Signatures of New Possibilities"]}]}],"canonical_facts":{"dc:contributor":["Stojkovic, Dejan","Physics"],"dc:creator":["Dong, Ruifeng; 0000-0001-6364-5250"],"dc:date":["2019-10-29T16:47:57Z","2019","2019-08-08 11:24:46"],"dc:description":["Ph.D.","Gravity leaves traces for us to explore. Newton's apple has evolved into various forms over the past 340 years. On the observational side: celestial motions of the planets, the precession of the Mercury's perihelion, the cosmic microwave background, the late-time accelerated expansion of the universe, etc. On the theoretical side: the existence of black holes, the three paradoxes in standard cosmology, Hawking radiation, information paradox, etc. Meanwhile, we are being led toward a perfect theory, if it exists, of gravity.In this thesis, I concentrate on the traces of gravity theories both in experiments and theory. Inspired by the symmetron model of gravity, I construct a new model of inflation. In this model, the inflaton field has an effective potential which changes the form when the environment changes. Before inflation, the universe is dense, the potential has U-shape and the inflaton rests at its minimum in equilibrium. With the cosmic expansion, when the universe is dilute enough, the effective potential changes to the symmetry-breaking form, forcing the inflaton to roll down. Based on a concrete two-field model of the universe, I solve the field equations of motion coupled with the Friedmann equation. The model successfully solves the initial-condition problem in inflation and produces a power spectrum of primordial perturbations, consistent with recent observations.The black hole is a prediction of most gravity theories. If they form in the early universe, their evaporation would leave a stochastic gravitational-wave signal today. I compute the Hawking radiation of gravitons from these black holes as well as their cosmological evolution and obtain the energy spectrum of the gravitational waves to be expected at the detectors today."],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/10477/80897"],"dc:language":["eng"],"dc:publisher":["State University of New York at Buffalo"],"dc:rights":["Users of works found in University at Buffalo Institutional Repository (UBIR) are responsible for identifying and contacting the copyright owner for permission to reuse. University at Buffalo Libraries do not manage rights for copyright-protected works and cannot assist with permissions.","Copyright retained by author."],"dc:subject":["theoretical physics","physics","astrophysics"],"dc:title":["Strong Gravity: Signatures of New Possibilities"],"dc:type":["Text","Dissertation"]},"updated_at":"2026-07-27T19:05:25Z"}