# Leonard Parker

> Leonard Emanuel Parker is a distinguished professor emeritus of physics and a former director of the Center for Gravitation and Cosmology at the University of Wisconsin–Milwaukee. During the late 1960s, Parker established a new area of physics—quantum field theory in curved spacetime. Specifically, by applying the technique of Bogoliubov transformations to quantum field theory with a changing gravitational field, he discovered the physical mechanism now known as cosmological particle production. His breakthrough discovery has a surprising consequence: the expansion of the universe can create particles out of the vacuum.
His work inspired research by hundreds of physicists and has been cited in more than 2,000 research papers; it was credited in the memoirs of Soviet physicist Andrei Sakharov and helped Stephen Hawking discover the creation of particles by black holes.

*American physicist*

**Canonical URL:** https://fame.am/person/leonard-parker

## Identity
- **Profile type:** Scientist ([Wikidata](https://www.wikidata.org/entity/Q39631))
- **Category:** Scientists
- **Country:** United States
- **Born:** 1938-05-13
- **Status:** living
- **Gender:** male

## Bio

Imported from discovery source: wikidata-dump

## Fame
- **Popularity score:** 37.4 / 100
- **Momentum:** 0.0 / 100  (trend: FALLING)
- **Historical depth:** 6.3 / 100
- **Now attention:** 0.0 / 100
- **Source confidence:** 40.0 / 100
- **Profile completeness:** 55.0 / 100

## Sources
- [இலியோனார்டு பார்க்கர்](https://ta.wikipedia.org/wiki/%E0%AE%87%E0%AE%B2%E0%AE%BF%E0%AE%AF%E0%AF%8B%E0%AE%A9%E0%AE%BE%E0%AE%B0%E0%AF%8D%E0%AE%9F%E0%AF%81_%E0%AE%AA%E0%AE%BE%E0%AE%B0%E0%AF%8D%E0%AE%95%E0%AF%8D%E0%AE%95%E0%AE%B0%E0%AF%8D)
- [ليونارد باركر](https://ar.wikipedia.org/wiki/%D9%84%D9%8A%D9%88%D9%86%D8%A7%D8%B1%D8%AF_%D8%A8%D8%A7%D8%B1%D9%83%D8%B1)
- [ليونارد باركر](https://arz.wikipedia.org/wiki/%D9%84%D9%8A%D9%88%D9%86%D8%A7%D8%B1%D8%AF_%D8%A8%D8%A7%D8%B1%D9%83%D8%B1)
- [Leonard Parker](https://de.wikipedia.org/wiki/Leonard_Parker)
- [Leonard Parker](https://en.wikipedia.org/wiki/Leonard_Parker)
- [لئونارد پارکر](https://fa.wikipedia.org/wiki/%D9%84%D8%A6%D9%88%D9%86%D8%A7%D8%B1%D8%AF_%D9%BE%D8%A7%D8%B1%DA%A9%D8%B1)
- [Léonard Parker](https://fr.wikipedia.org/wiki/L%C3%A9onard_Parker)
- [Wikidata](https://www.wikidata.org/wiki/Q3271532)

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