String Theory (Black Holes, Gauge-gravity duality)
I have carried out research in the areas of Elementary Particles Physics and Quantum Gravity. I have worked in the major focus areas of research in the above disciplines e.g. gauge-gravity duality, spacetime singularity resolution and non-commutativity. Currently I am interested in the study of Holographic QCD and Black Holes via Gauge-gravity duality.
Gauge-gravity duality (also known as AdS/CFT correspondence) has its origin in String theory and gives a suitable description of gravity in terms of matter degrees of freedom. Recently, the gauge- gravity duality has been used to understand the strong coupling dynamics of QCD. In our recent work, we have computed the spectrum of spin 3/2 baryons (resonances) and pion-nucleon couplings thereof from AdS/QCD perspective. We have also applied the numerical techniques to calculate the electric dipole moment of the Neutron from holographic QCD. The results can be used to put an upper bound on the strong CP-violation parameter, theta.

Awards:

Young Scientist Project under Fast Track Scheme of DST
Title: Dynamics of QCD via Gauge-Gravity Duality (2010-2013)

• Secretary, Indian Physics Association, Varanasi Chapter (Sept 2008 onward)
• Senior Advisor, Indian Students Association, Pusan National University, Pusan, S.Korea: (April 2007-Nov 2007).
• Visiting Scientist, the Abdus Salam International Centre for Theoretical Physics, Trieste, Italy (Oct. 2004)
• Felix Scholar, University of Oxford, Oxford, UK. (1997 - 2000)
• Giulio Racah Scholarship, International School of Subnuclear Physics, Ettore Majorana Centre, Erice, Sicily, Italy. (Sept 1999)

List of 10 major Publications:

1. A. Kumar, R. R. Nayak and Sanjay, D-brane solutions in pp-wave background, Phys. Lett. B 541 (2002) 183, [hep-th/0204025]. (Topcite- 50+)
2. A. Nichols and Sanjay, Logarithmic operators in the SL(2, R) WZNW model, Nucl. Phys. B 597 (2001) 633, [hep-th/0007007].
3. Sanjay, Logarithmic operators in SL(2,R) WZNW model, Singletons and AdS_3/(L)CFT_2 correspondence, J. Phys. A, Vol.35, No.46 (2002) 9881, [hep-th/0011056].
4. Deog Ki Hong , Hyun-Chul Kim , Sanjay Siwach , Ho-Ung Yee, The Electric Dipole Moment of the Nucleons in Holographic QCD, JHEP 0711 (2007) 036, arXiv:0709.0314 [hep-ph]
5. Hyo Chul Ahn, Deog Ki Hong, Cheonsoo Park, Sanjay Siwach , Spin 3/2 Baryons and Form Factors in AdS/QCD, Phys.Rev.D 80:054001 (2009). arXiv:0904.3731 [hep-ph]
6. S. Kalyana Rama, and Sanjay Siwach, A description of multi charged black holes in terms of branes and antibranes, Phys. Lett. B 596 (2004) 221, [hep-th/0405084].
7. Rabin Banerjee, Choonkyu Lee and Sanjay Siwach, Deformed conformal and super-Poincar� symmetries in the non-(anti)commutative spaces, Eur. Phys J. C 48 (2006) 305, [hep-th/0511205].
8. Dongsu Bak, Sanjay Siwach and Ho-Ung Yee, 1/2 BPS geometries of M2 giant gravitons, Phys. Rev. D 72 (2005) 086010, [hep-th/0504098].
9. N. Ohta, K. L. Panigrahi and Sanjay, Intersecting branes in pp-wave spacetime, Nucl. Phys. B 674 (2003) 306, [hep-th/0306186].
10. K. L. Panigrahi and Sanjay, D-brane solutions in pp-wave spacetime with nonconstant NS-NS flux, Phys. Lett. B 561 (2003) 284, [hep- th/0303182].

1. Shobhit Sachan, Sanjay Siwach; Thermodynamics of soft wall AdS/QCD at finite chemical potential;Mod.Phys.Lett. A27 (2012) 1250163.
2. Sanjay Siwach and Bhupendra Nath Tiwari; On Attractor Flow and Small Black Holes; Mod.Phys.Lett. A26 (2011) 967-974.
3. Hyo Chul Ahn, Deog Ki Hong, Cheonsoo Park, Sanjay Siwach , Spin 3/2 Baryons and Form Factors in AdS/QCD, Phys.Rev.D 80:054001 (2009). arXiv:0904.3731 [hep-ph]
4. Deog Ki Hong , Hyun-Chul Kim , Sanjay Siwach , Ho-Ung Yee, The Electric Dipole Moment of the Nucleons in Holographic QCD, JHEP 0711 (2007) 036, arXiv:0709.0314 [hep-ph]
5. R. R. Nayak, K. L. Panigrahi and Sanjay Siwach, Time-dependent supergravity solutions in null dilaton background, Phys Lett. B 640 (2006) 214, [hep-th/0605278].
6. Rabin Banerjee, Choonkyu Lee and Sanjay Siwach, Deformed conformal and super-Poincar� symmetries in the non-(anti)commutative spaces, Eur. Phys J. C 48 (2006) 305, [hep-th/0511205].
7. Dongsu Bak, Sanjay Siwach and Ho-Ung Yee, 1/2 BPS geometries of M2 giant gravitons, Phys. Rev. D 72 (2005) 086010, [hep-th/0504098].
8. S. Kalyana Rama, and Sanjay Siwach, A description of multi charged black holes in terms of branes and antibranes, Phys. Lett. B 596 (2004) 221, [hep-th/0405084].
9. A. Kumar, R.R. Nayak, Sanjay Siwach , D-branes in pp-wave background, (Prepared for 9th International Symposium on Particles, Strings and Cosmology (PASCOS 03), Mumbai (Bombay) India, 3-8 Jan 2003), Pramana 62 (2004) 695.
10. R. R. Nayak, K. L. Panigrahi, and Sanjay Siwach, Brane solutions with/ without rotation in pp-wave spacetime, Nucl. Phys. B 698 (2004) 149, [hep-th/0405124].
11. N. Ohta, K. L. Panigrahi and Sanjay, Intersecting branes in pp-wave spacetime, Nucl. Phys. B 674 (2003) 306, [hep-th/0306186].
12. K. L. Panigrahi and Sanjay, D-brane solutions in pp-wave spacetime with nonconstant NS-NS flux, Phys. Lett. B 561 (2003) 284, [hep- th/0303182].
13. A. Kumar, R. R. Nayak and Sanjay, D-brane solutions in pp-wave background, Phys. Lett. B 541 (2002) 183, [hep-th/0204025]. (Topcite- 50+)
14. Sanjay, Logarithmic operators in SL(2,R) WZNW model, Singletons and AdS_3/(L)CFT_2 correspondence,J. Phys. A, Vol.35, No.46 (2002) 9881,[hep-th/0011056].
15. A. Nichols and Sanjay, Logarithmic operators in the SL(2, R) WZNW model, Nucl. Phys. B 597 (2001) 633, [hep-th/0007007].
16. Sanjay, On direct and crossed channel asymptotics of four point functions in AdS / CFT correspondence, Mod.Phys.Lett.A14:1413-1420,1999. [hep-th/9906099]