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===Cosmological Constant===
===Cosmological Constant===
{{Main|Cosmological constant}}
{{Main|Cosmological constant}}
The discovery and publication in 1987 of an early correspondence between Einstein and Marić revealed that they had had a daughter, called "Lieserl" in their letters, born in early 1902 in Novi Sad where Marić was staying with her parents. Marić returned to Switzerland without the child, whose real name and fate are unknown. Einstein probably never saw his daughter. The contents of his letter to Marić in September 1903 suggest that the girl was either adopted or died of scarlet fever in infancy.[35][36]
Einstein, looking relaxed and holding a pipe, stands next to a smiling, well-dressed Elsa who is wearing a fancy hat and fur wrap. She is looking at him.
Einstein with his wife Elsa
Einstein and Marić married in January 1903. In May 1904, their first son, Hans Albert Einstein, was born in Bern, Switzerland. Their second son, Eduard, was born in Zürich in July 1910. In April they moved to Berlin. After a few months his wife returned to Zürich with their sons, after learning that Einstein's chief romantic attraction was his first and second cousin Elsa.[37] They divorced on 14 February 1919, having lived apart for five years.[38] Eduard, whom his father called "Tete" (for petit), had a breakdown at about age 20 and was diagnosed with schizophrenia.[39] His mother cared for him and he was also committed to asylums for several periods, finally being committed permanently after her death.[40]
In letters revealed in 2015, Einstein wrote to his early love, Marie Winteler, about his marriage and his still-strong feelings for Marie. In 1910 he wrote to her that "I think of you in heartfelt love every spare minute and am so unhappy as only a man can be" while his wife was pregnant with their second child. Einstein spoke about a "misguided love" and a "missed life" regarding his love for Marie.[41]
Einstein married Elsa Löwenthal in 1919,[42][43] after having had a personal relationship with her since 1912.[44] She was a first cousin maternally and a second cousin paternally.[44] In 1933, they emigrated to the United States. In 1935, Elsa Einstein was diagnosed with heart and kidney problems; she died in December 1936.[45]
Einstein revised his work on General Relativity to include a 'fudge-factor' which he termed the "cosmological constant". He was trying to account for the apparent steady-state nature of the universe.
Einstein revised his work on General Relativity to include a 'fudge-factor' which he termed the "cosmological constant". He was trying to account for the apparent steady-state nature of the universe.