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astro-ph.CO2026
Spectral Fingerprints Beyond Degeneracies in Primordial Gravitational-Wave Sources
Subhasis Maiti
Stochastic gravitational-wave backgrounds from different primordial mechanisms can exhibit identical peak frequencies and amplitudes, leaving their origin degenerate. We show that…
astro-ph.CO2026
The Magnetic Origin of Primordial Black Holes: Ultralight PBHs and Secondary GWs
Subhasis Maiti, Debaprasad Maity
Ultralight primordial black holes (PBHs) provide a compelling window into early-Universe cosmology. Following our earlier work, we explore a mechanism for the formation of ultralig…
astro-ph.CO2026
Gravitational Waves from Post-Inflationary Magnetism: Direct and Scalar-Induced Contributions
Subhasis Maiti
We study stochastic gravitational waves generated in a post-inflationary magnetogenesis scenario with time-dependent gauge couplings during inflation and reheating. In this setup,…