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PUMA is a proposal for an ultra-wideband, low-resolution and transitinterferometric radio telescope operating at $200-1100\,\mathrm{MHz}$. Itsdesign is driven by six science goals which span three science themes: thephysics of dark energy (measuring the expansion history and growth of theuniverse up to $z=6$), the physics of inflation (constraining primordialnon-Gaussianity and primordial features) and the transient radio sky (detectingone million fast radio bursts and following up SKA-discovered pulsars). Wepropose two array configurations composed of hexagonally close-packed 6m disharrangements with 50% fill factor. The initial 5,000 element 'petite array' isscientifically compelling, and can act as a demonstrator and a stepping stoneto the full 32,000 element 'full array'. Viewed as a 21cm intensity mappingtelescope, the program has the noise equivalent of a traditional spectroscopicgalaxy survey comprised of 0.6 and 2.5 billion galaxies at a comovingwavenumber of $k=0.5\,h\mathrm{Mpc}^{-1}$ spanning the redshift range $z = 0.3- 6$ for the petite and full configurations, respectively. At redshifts beyond$z=2$, the 21cm technique is a uniquely powerful way of mapping the universe,while the low-redshift range will allow for numerous cross-correlations withexisting and upcoming surveys. This program is enabled by the development ofultra-wideband radio feeds, cost-effective dish construction methods, commodityradio-frequency electronics driven by the telecommunication industry and theemergence of sufficient computing power to facilitate real-time signalprocessing that exploits the full potential of massive radio arrays. Theproject has an estimated construction cost of 55 and 330 million FY19 USD forthe petite and full array configurations. Including R&D, design, operations andscience analysis, the cost rises to 125 and 600 million FY19 USD, respectively.

Packed Ultra-wideband Mapping Array (PUMA): A Radio Telescope for Cosmology and Transients