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{{Short description | Indian theoretical physicist (born 1956)}}
{{use dmy dates|date=February 2024}}
{{Infobox scientist
| name = Varun Sahni
| image =
| alt =
| caption =
| birth_date = {{Birth date and age|1956|3|29}}
| birth_place =
| death_date =
| death_place =
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| fields = {{ublist | [[Astrophysics]] | [[Astronomy]] }}
| workplaces = {{ublist | [[Inter-University Centre for Astronomy and Astrophysics]] }}
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| doctoral_advisor = [[Alexei Starobinsky]]
| doctoral_students =
| father = [[Bhisham Sahni]]
| known_for = Studies on Dark Energy, large-scale structure of the Universe
| awards = {{ublist|
}}
'''
Sahni is reported to have studied the universe, more specifically its large-scale structure, the early inflationary phase and cosmological constant.<ref name="Brief Profile of the Awardee">{{Cite web |url=http://ssbprize.gov.in/Content/Detail.aspx?AID=24 |title=Brief Profile of the Awardee |date=2017-10-17 |publisher=Shanti Swarup Bhatnagar Prize |access-date=2017-10-17}}</ref> His achievements include the establishment of a cosmic no-hair theorem related to inflation, analysis of the universe structure using self-developed statistical methods, discovery of novel models of [[dark energy]] and [[dark matter]], design of unified models of Inflation and dark energy and the elucidation of [[Big Bang theory]] using [[Brane cosmology|Braneworld physics]].<ref name="Indian fellow">{{Cite web |url=http://insaindia.res.in/detail/P11-1555 |title=Indian fellow |date=2017-10-17 |publisher=Indian National Science Academy |access-date=2017-10-17}}</ref> His studies have been documented by way of a number of articles<ref name="On ResearchGate">{{Cite web |url=https://www.researchgate.net/profile/Varun_Sahni2 |title=On ResearchGate |date=2017-10-17
Sahni is a member of the [[International Astronomical Union]].<ref name="IAU Members">{{Cite web |url=https://www.iau.org/administration/membership/individual/8343/ |title=IAU Members |date=2017-10-19 |website=International Astronomical Union |access-date=2017-10-19}}</ref> He has delivered plenary addresses at many conferences and seminars; "Cosmology after the BOOMERANG experiment" delivered at the Astronomy Seminars 2000 of the [[Tata Institute of Fundamental Research]]<ref name="Cosmology after the BOOMERANG experiment">{{Cite web |url=http://www.tifr.res.in/~space/sem00.html |title=Cosmology after the BOOMERANG experiment |date=2017-10-19 |website=Tata Institute of Fundamental Research |access-date=2017-10-19}}</ref> and Frontiers of Cosmology and Gravitation (ICGC 2011) of the
were two of them.<ref name="Frontiers of Cosmology and Gravitation">{{Cite web |url=https://www.icts.res.in/event/page/6606 |title=Frontiers of Cosmology and Gravitation |date=2017-10-19 |website=International Centre for Theoretical Sciences |access-date=2017-10-19}}</ref> The School of Applied Mathematical and Physical Sciences of the [[National Technical University of Athens]] has listed one of his talks on Dark matter and dark energy, delivered in March 2004, as the best cited among Aegean School talks.<ref name="Best-sited articles">{{Cite web |url=http://www.physics.ntua.gr/cosmo17/Sifnos2017/Best%20Cited%20Articles.pdf |title=Best-sited articles |date=2017-10-19 |website=National Technical University of Athens |access-date=2017-10-19}}</ref> He is also a recipient of the Homi Bhabha Medal (2014) of the Indian National Science Academy.<ref name="Homi Jehangir Bhabha Medal ">{{Cite web |url=http://insaindia.res.in/recipients.php#34 |title=Homi Jehangir Bhabha Medal |date=2017-10-19 |website=Indian National Science Academy |access-date=2017-10-19}}</ref>
== Selected bibliography ==
=== Chapters ===
* {{cite book|author1=Eleftherios Papantonopoulos|author2=Varun Sahni (Chapter author)|title=The Physics of the Early Universe|chapter-url=https://books.google.com/books?id=2fkFPh2jNIkC&pg=PA141|date=7 January 2005|publisher=Springer Science & Business Media|isbn=978-3-540-22712-0|pages=141–|chapter=Dark Matter and Dark Energy}}
=== Articles ===
* {{Cite journal |last=Varun Sahni, Peter Coles |title=Approximation Methods for Non-linear Gravitational Clustering |journal=Phys. Rep. |publication-date=1995 |volume=262 |pages=1–135 |doi=10.1016/0370-1573(95)00014-8|year=1995 |issue=1–2 |bibcode=1995PhR...262....1S |arxiv=astro-ph/9505005 |s2cid=119442929 }}
* {{Cite book |last=Varun Sahni |chapter =Dark Matter and Dark Energy |title=The Physics of the Early Universe |editor=E. Papantonopoulos |volume=653 |pages=141–180 |doi=10.1007/b99562|series=Lecture Notes in Physics |year=2005 |isbn=978-3-540-22712-0 |bibcode=
* {{Cite journal |last=Varun Sahni |title=Dark Energy |journal=Journal of Physics: Conference Series |publication-date=2006 |volume=31 |pages=
* {{Cite journal |last=Varun Sahni, Arman Shafieloo, Alexei A. Starobinsky |title=Two new diagnostics of dark energy |journal=Phys. Rev. D |publication-date=2008 |volume=78 |issue=10 |pages=103502 |doi=10.1103/PhysRevD.78.103502|year=2008 |bibcode=2008PhRvD..78j3502S |arxiv=0807.3548 |s2cid=118452106 }}
* {{Cite journal |last=Varun Sahni |title=Ya. B. Zeldovich (1914-1987): Chemist, Nuclear Physicist, Cosmologist |journal=Resonance |
== See also ==
* [[Somak Raychaudhury]]
▲{{portal|India|Physics}}
== Notes ==
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== References ==
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== External links ==
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{{SSBPST recipients in Physical Science}}
{{Authority control}}
{{DEFAULTSORT:Sahni, Varun}}
[[Category:Recipients of the Shanti Swarup Bhatnagar Award in Physical Science]]
[[Category:1956 births]]
[[Category:Fellows of the Indian Academy of Sciences]]
[[Category:Fellows of the Indian National Science Academy]]
[[Category:Fellows of
[[Category:Indian theoretical physicists]]
[[Category:Indian astrophysicists]]
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