Physics
https://repository.iitgn.ac.in/handle/123456789/607
2019-12-16T01:08:50ZObserving sub-poissonian statistics of twisted single photons using oscilloscope
https://repository.iitgn.ac.in/handle/123456789/5022
Observing sub-poissonian statistics of twisted single photons using oscilloscope
Lal, Nijil; Shajilal, Biveen; Anwar, Ali; Perumangatt, Chithrabhanu; Singh, R. P.
Heralded single photon sources (HSPSs) from spontaneous parametric down-conversion are widely used as single photon sources. We study the photon number statistics of an HSPS carrying orbital angular momentum in our laboratory and observe the sub-Poissonian statistics using only photodetectors and an oscilloscope.
2019-11-01T00:00:00ZSynchronization of globally coupled Lozi map using periodically varying parameter
https://repository.iitgn.ac.in/handle/123456789/5023
Synchronization of globally coupled Lozi map using periodically varying parameter
Roy, Baishali; Acharyya, Ajanta Bhowal
Synchronization in globally coupled Lozi maps has been investigated, when one of the parameters of the Lozi maps, ?, is forced to vary periodically. Interestingly, it is observed that due to the variation of the parameter with time, the transition from desynchronized state to synchronized state occurs at lower values of global coupling strength. The synchronized and desynchronized state of CML are distinguished with the help of two statistical quantities: the average fraction of elements belonging to clusters and the standard deviation of the state variables averaged over different realisation of initial conditions. The transition of the system to the synchronised state in globally coupled Lozi map under parametric excitation will be helpful for better way of achieving the synchronised state in the case of various natural and well-known examples of synchronising systems.
2019-10-01T00:00:00ZTests of general relativity with the binary black hole signals from the LIGO-Virgo catalog GWTC-1
https://repository.iitgn.ac.in/handle/123456789/5024
Tests of general relativity with the binary black hole signals from the LIGO-Virgo catalog GWTC-1
Sengupta, Anand S.
2019-11-01T00:00:00ZStrong cosmic censorship in higher curvature gravity
https://repository.iitgn.ac.in/handle/123456789/5015
Strong cosmic censorship in higher curvature gravity
Mishra, Akash K.; Chakraborty, Sumanta
Deterministic nature of general relativity is ensured by the strong cosmic censorship conjecture, which asserts that spacetime cannot be extended beyond Cauchy horizon with square integrable connection. Although this conjecture holds true for asymptotically flat black hole spacetimes in general relativity, a potential violation of this conjecture occurs in charged asymptotically de Sitter spacetimes. Since it is expected that Einstein-Hilbert action will involve higher curvature corrections, in this article we have studied whether one can restore faith in the strong cosmic censorship when higher curvature corrections to general relativity are considered. Contrary to our expectations, we have explicitly demonstrated that not only a violation to the conjecture occurs near extremality, but the violation appears to become stronger as the strength of the higher curvature term increases.
2019-11-01T00:00:00Z