in theoretical physics that relates two kinds of physical theories. On
one side of the correspondence are conformal field theories, including
theories similar to the Yang–Mills theories that describe elementary
particles. On the other side of the correspondence are anti-de Sitter
spaces (cross section depicted), which are used in theories of quantum
gravity, formulated in terms of string theory or M-theory. Proposed by
Juan Maldacena in late 1997, the AdS/CFT correspondence represents a
major advance in our understanding of string theory and quantum gravity.
This is because it provides a non-perturbative formulation of string
theory and because it is the most successful realization of the
holographic principle, an idea in quantum gravity originally proposed by
Gerard 't Hooft. In addition, it provides a powerful toolkit for
studying strongly coupled quantum field theories and has been used to
study many aspects of nuclear and condensed matter physics by
translating problems in those subjects into more mathematically
tractable problems in string theory.
Read more: <https://en.wikipedia.org/wiki/AdS/CFT_correspondence>
_______________________________
Today's selected anniversaries:
1854:
In his apostolic constitution Ineffabilis Deus, Pope Pius IX
proclaimed the dogmatic definition of the Immaculate Conception, which
holds that the Virgin Mary was conceived free of original sin.
<https://en.wikipedia.org/wiki/Immaculate_Conception>
1941:
The Holocaust: The Chełmno extermination camp in occupied
Poland, the first such Nazi camp to kill the Jews of the Ghetto
Litzmannstadt and the Warthegau by poison gas, began operating.
<https://en.wikipedia.org/wiki/Che%C5%82mno_extermination_camp>
1963:
After being hit by a lightning strike while in a holding
pattern, Pan Am Flight 214 crashed near Elkton, Maryland, US, killing
all 81 people on board.
<https://en.wikipedia.org/wiki/Pan_Am_Flight_214>
1987:
Arab–Israeli conflict: An Israeli army tank transporter
killed four Palestinian refugees and injured seven others during a
traffic accident at the Erez Crossing on the Israel–Gaza Strip border,
sparking the First Intifada.
<https://en.wikipedia.org/wiki/First_Intifada>
2009:
Bombings carried out by the Islamic State of Iraq in Baghdad,
Iraq, killed 127 and injured 448.
<https://en.wikipedia.org/wiki/December_2009_Baghdad_bombings>
_____________________________
Wiktionary's word of the day:
menorah:
(Judaism) A candelabrum with nine branches used in Jewish worship on
Hanukkah.
<https://en.wiktionary.org/wiki/menorah>
___________________________
Wikiquote quote of the day:
It is difficult to speak of what is common in a way of your own.

--Horace
<https://en.wikiquote.org/wiki/Horace>
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