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Biography
Charanjit Singh Aulakh (born May 21, 1954) is an Indian theoretical physicist and a Professor of physics at the Indian Institute of Science Education and Research Mohali. Earlier he was a faculty member and Chairperson of the Physics department at Panjab University, Chandigarh during 2010-2013. He was a senior associate during 2014–2019 at International Centre for Theoretical Physics, Trieste, Italy.

Career and Research
He received his Ph.D. (1983) from the City University of New York, under the supervision of Rabindra Mohapatra. His work mostly focuses on  Supersymmetric Grand Unified Theories. He is known for introducing, with Rabindra Mohapatra, the idea of sneutrino vacuum expectation values in the context of Supersymmetric extensions of the Standard model and for introduction and development of the so-called ``Minimal Supersymmetric SO(10) Grand Unified Theory’’.

Charanjit Aulakh and Rabindra Mohapatra were the first to show that sneutrino vacuum expectation values (VEVs) in Supersymmetric Standard Models could not be redefined away. They connected the neutrino VEVs to a strongly constrained novel ``doublet Majoron ‘’ as well as to radiatively induced neutrino masses. This work continues to be widely cited because of its early connection between Supersymmetric phenomenology and neutrino masses, both topics still enjoying a long-continued vogue.

Aulakh and Mohapatra also formulated the first complete Supersymmetric SO(10) GUT model [2]. After the discovery of neutrino oscillations indicating neutrino masses in the milli-electron volt range (and thus a neutrino mass seesaw scale close to the Grand Unification scale). Aulakh and later collaborators [3] recognized this early model as the “ Minimal Supersymmetric grand Unified theory” capable of accounting for all the low energy fermion mass data with the smallest number of input parameters. Moreover, they connected [3,4] Supersymmetric SO(10) models to the naturally R-parity preserving “Minimal Left-Right Supersymmetric“ models (formulated by Aulakh and collaborators [5,6,7,8] just around the time of the discovery of neutrino mass). Thus they showed that R-parity (or equivalently “matter parity”) was part of the SO(10) gauge group and could be preserved till low energies in spite of the necessary spontaneous breaking of B-L symmetry. Thus these realistic models also predicted viable sparticle WIMP dark matter candidates stabilized by the R-parity which survives down to the scale of Supersymmetry breaking. Symmetry breaking in these GUT models was completely calculable reducible to the solution of a cubic equation with one complex parameter[3]. For the first time, it became possible to scan[9,10] the parameter space of a completely realistic Grand Unified Theory with Type I and Type II seesaw mechanisms and to incorporate the effects of calculated heavy particle spectra. This yielded specific constraints [9] on viable GUTs on the basis of the fit neutrino masses and mixing. For this analysis, a manual [11] for systematically and explicitly decomposing SO(10) invariant products of fields into Pati-Salam group invariants was developed and continues to be widely used by model builders.

He is also known for early work with Koh and Ouvry [12] on Lagrangians for higher spin fields which introducing the terminology of `telescopic Higgs effects’ and their associated pyramids of ``ghosts of ghosts...’’ required for the field quantization of nested gauge invariances. With Sahdev, he had earlier explicated [13] the infinite-dimensional (telescopic) Higgs effect operative to generate massive graviton towers in Kaluza-Klein theories.