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Nature of Dark Energy: The dark energy, solely responsible of the accelerated expansion of the universe(as suggested by the recent supernova data) suggests that the dark energy, may not be constant but could be dynamical which evolves with time. This challenges the standard Lambda-CDM cosmological model(according to which the dark energy(cosmological constant) is a constant entity) and implies a need for new physics to explain these observations.
Recent works(published/communicated)
- Constructing Viable Interacting Dark Matter and Dark Energy Models: A Dynamical Systems Approach, Ashmita, K. Banerjee and Prasanta Kr. Das, JCAP 11 (2024) 034.
- Inflationary Cosmology in a non-minimal $f(R,T)$ gravity theory using a $RT$ mixing term, Payel Sarkar, Ashmita and Prasanta Kumar Das, Physics of the Dark Universe, 40, 101190 (2023)
- Inflationary cosmology with a non-minimal curvature and scalar mixing $\xi R \phi^2$ term, Payel Sarkar, Ashmita Rai and Prasanta Kumar Das, Annals of Physics (2023) 169340
2. Dark Matter Investigations: Researchers are developing innovative methods to detect and understand dark matter. For instance, studies are exploring how dark matter particles might accumulate in neutron stars, leading to observable effects(tidal formation) that could be detected by gravitational wave observatories. Extracting information about dark matter mass, spin and other properties (note that dark matter has no electric charge) from the direct and in-direct detection process of dark matter, the consideration of relic density are crucially important.
Recent works (published/communicated)
- Revisiting the Inert Scalar Dark Matter with Vector-like Quarks, Prasanta Kumar Das(BITS Goa), Shyamashish Dey, Saumyen Kundu, Santosh Kumar Rai(HRI, Allahabad), e-print 2412.17719 (Submitted to JHEP).
- Jet substructure probe to freeze-in dark matter in alternative cosmological background, Saumyen Kundu, Sudipta Show, Partha Konar and Prasanta Kumar Das, Eur.Phys.J.ST (2024)
- Freeze-In Dark Matter Search at Colliders with Jet Substructure Analysis, Saumyen Kundu, Sudipta Show, Partha Konar and Prasanta Kumar Das, Ref. Springer Proc.Phys. 304 (2024) 393-396
3. Gravitation wave astronomy and Compact srar (Neutron star, Black hole) The detection of gravitational waves has opened new avenues for exploring cosmic phenomena, including black hole mergers and neutron star collisions. The detection of in Tidal deformation(produced due to NS merger)) and tidal heating(produced due to BH merger) has become an important task in the gravitational wave astronomy experiments. These observations provide insights into the behavior of matter and gravity under extreme conditions.
Recent works (published/communicated):
- Implications of Fermionic Dark Matter Interactions on Anisotropic Neutron Stars, Premachand Mahapatra(BITS-Goa) , Chiranjeeb Singha (IUCAA, Pune), Ayush Hazarika(IUCAA,Pune) and Prasanta Kumar Das(BITS-Goa). Ref: ArXiv: 2408.14020 (Submitted to APJ).
- Neutron Stars in modified f(R,T) gravity framework with O(T,T^2) terms, Premachand Mahapatra and Prasanta Kumar Das(BITS Goa). Ref: ArXiv:2401.01321 (Submitted to Physics of the Dark Universe).
4. Role of AI in Fundamental Physics: The quest for new physics i.e. physics beyond the standard model is one of main theme of the present day research activities. In the light of the huge complex data available from different high energy, astronomical and cosmological observations, it has become imperative to explore the role of Artificial intelligence(AI) in searching the new physics. AI is increasingly being utilized to analyze complex datasets in particle physics, astrophysics and cosmology. AI aids in detecting rare events and patterns, potentially unveiling new particles or forces, and enhancing our understanding of the universe's fundamental laws.
Article: Role of AI in the upcoming research(M. Thomson, CERN's Director General(upcoming))
An Institute of Eminence
