38 citations · 199 across the 12 of their papers we have counts for
12 papers
Can WIMPs Survive the Legacy of a Magnetised Early Universe?
María Olalla Olea-Romacho, Malcolm Fairbairn, Pranjal Ralegankar
Primordial magnetic fields (PMFs) can seed additional small-scale matter fluctuations, leading to the formation of dense, early-collapsing dark matter structures known as minihalos…
Constraints on Primordial Magnetic Fields from the Lyman-α forest
Mak Pavičević, Vid Iršič, Matteo Viel +5
We present the first constraints on primordial magnetic fields from the Lyman- forest using full cosmological hydrodynamic simulations. At the scales and redshifts probed by the…
Gravothermalizing into primordial black holes, boson stars, and cannibal stars
Pranjal Ralegankar, Daniele Perri, Takeshi Kobayashi
Very little is known about the cosmological history from after the end of inflation until Big Bang Nucleosynthesis. Various well-motivated models predict that the universe could ha…
Matter power spectrum induced by primordial magnetic fields: from the linear to the non-linear regime
Pranjal Ralegankar, Enrico Garaldi, Matteo Viel
Linear theory predicts that primordial magnetic fields (PMFs) enhance the matter power spectrum on small scales. However, the linear approximation breaks down on sufficiently small…
Primordial magnetic fields: consistent initial conditions and impact on high-z structures
Pranjal Ralegankar, Mak Pavičević, Matteo Viel
Primordial magnetic fields (PMFs) can enhance matter power spectrum on small scales ( Mpc) and still agree with bounds from cosmic microwave background (CMB) and Faraday…
Dark Matter Minihalos from Primordial Magnetic Fields
Pranjal Ralegankar
Primordial magnetic fields (PMF) can enhance baryon perturbations on scales below the photon mean free path. However, a magnetically driven baryon fluid becomes turbulent near reco…
Dark radiation constraints on portal interactions with hidden sectors
Peter Adshead, Pranjal Ralegankar, Jessie Shelton
We update dark radiation constraints on millicharged particle (MCP) and gauged baryon-number-minus-lepton-number () extensions of the Standard Model (SM). In these models, a m…
Cannibalism's lingering imprint on the matter power spectrum
Adrienne L. Erickcek, Pranjal Ralegankar, Jessie Shelton
The early universe may have contained internally thermalized dark sectors that were decoupled from the Standard Model. In such scenarios, the relic dark thermal bath, composed of t…
Cannibal domination and the matter power spectrum
Adrienne L. Erickcek, Pranjal Ralegankar, Jessie Shelton
Decoupled hidden sectors can easily and generically result in a period of cannibal domination, during which the dominant component of the Universe has an equation of state intermed…
BBN constraints on dark radiation isocurvature
Peter Adshead, Gilbert Holder, Pranjal Ralegankar
The existence of dark radiation that is completely decoupled from the standard model in the early Universe leaves open the possibility of an associated dark radiation isocurvature…
Reheating in two-sector cosmology
Peter Adshead, Pranjal Ralegankar, Jessie Shelton
We analyze reheating scenarios where a hidden sector is populated during reheating along with the sector containing the Standard Model. We numerically solve the Boltzmann equations…
Late decaying 2-component dark matter scenario as an explanation of the AMS-02 positron excess
Jatan Buch, Pranjal Ralegankar, Vikram Rentala
The long standing anomaly in the positron flux as measured by the PAMELA and AMS-02 experiments could potentially be explained by dark matter (DM) annihilations. This scenario typi…