#### Alladi Ramakrishnan Hall

#### Dark Matter decay and cosmological Hubble measurement anomaly

#### Subinoy Das

##### IIA, Bengaluru

*The Hubble tension between the ΛCDM-model-dependent prediction *

of the current expansion rate H0 using Planck data and direct,

model-independent measurements in the local universe from the SH0ES

collaboration disagree at >3.5σ. Moreover, there exists a milder ∼2σ

tension between similar predictions for the amplitude S8 of matter

fluctuations and its measurement in the local universe. As explanations

relying on unresolved systematics have not been found, theorists have

been exploring explanations for these anomalies that modify the

cosmological model, altering early-universe-based predictions for these

parameters. However, new cosmological models that attempt to resolve one

tension often worsen the other. In this talk, I will investigate a

decaying dark matter (DDM) model as a solution to both tensions

simultaneously.

Done