We present a model for the squeezed dark matter bispectrum, where the short modes are deep in the... more We present a model for the squeezed dark matter bispectrum, where the short modes are deep in the non-linear regime. We exploit the consistency relations for large-scale structures combined with a response function approach to write the squeezed bispectrum in terms of a few unknown functions of the short modes. We provide an ansatz for a fitting function for these response functions, checking that the resulting model is reliable when compared to the one-loop squeezed bispectrum. We then test the model against measured bispectra from numerical simulations for short modes ranging between k ∼ 0.1 h/Mpc, and k ∼ 0.7 h/Mpc at redshift z = 0. To evaluate the goodness of the fit of our model we implement a non-Gaussian covariance and find agreement within one standard deviation of the simulated data.
Journal of Cosmology and Astroparticle Physics, Jul 14, 2020
We write down the Lagrangian bias expansion in general relativity up to 4th order in terms of ope... more We write down the Lagrangian bias expansion in general relativity up to 4th order in terms of operators describing the curvature of an early-time hypersurface for comoving observers. They can be easily expanded in synchronous or comoving gauges. This is necessary for the computation of the one-loop halo bispectrum, where relativistic effects can be degenerate with a primordial non-Gaussian signal. Since the bispectrum couples scales, an accurate prediction of the squeezed limit behavior needs to be both non-linear and relativistic. We then evolve the Lagrangian bias operators in time in comoving gauge, obtaining non-local operators analogous to what is known in the Newtonian limit. Finally, we show how to renormalize the bias expansion at an arbitrary time and find that this is crucial in order to cancel unphysical 1/k 2 divergences in the large-scale power spectrum and bispectrum that could be mistaken for a contamination to the non-Gaussian signal.
Journal of Cosmology and Astroparticle Physics, Apr 1, 2022
Relativistic corrections to the evolution of structure can be used to test general relativity on ... more Relativistic corrections to the evolution of structure can be used to test general relativity on cosmological scales. They are also a well-known systematic contamination in the search for a primordial non-Gaussian signal. We present a numerical framework to generate RELativistic second-order Initial Conditions (RELIC) based on a generic (not necessarily separable) second-order kernel for the density perturbations. In order to keep the time complexity manageable we introduce a scale cut that separates long and short scales, and neglect the "short-short" coupling that will eventually be swamped by uncontrollable higher-order effects. To test our approach, we use the second-order Einstein-Boltzmann code SONG to provide the numerical second-order kernel in a ΛCDM model, and we demonstrate that the realisations generated by RELIC reproduce the bispectra well whenever at least one of the scales is a "long" mode. We then present a generic algorithm that takes a perturbed density field as an input and provides particle initial data that matches this input to arbitrary order in perturbations for a given particle-mesh scheme. We implement this algorithm in the relativistic N-body code gevolution to demonstrate how our framework can be used to set precise initial conditions for cosmological simulations of large-scale structure.
We study the information content of summary statistics built from the multi-scale topology of lar... more We study the information content of summary statistics built from the multi-scale topology of large-scale structures on primordial non-Gaussianity of the local and equilateral type. We use halo catalogs generated from numerical N-body simulations of the Universe on large scales as a proxy for observed galaxies. Besides calculating the Fisher matrix for halos in real space, we also check more realistic scenarios in redshift space. Without needing to take a distant observer approximation, we place the observer on a corner of the box. We also add redshift errors mimicking spectroscopic and photometric samples. We perform several tests to assess the reliability of our Fisher matrix, including the Gaussianity of our summary statistics and convergence. We find that the marginalized 1-σ uncertainties in redshift space are Δf NL loc ∼ 16 and Δf NL equi ∼ 41 on a survey volume of 1 (Gpc/h)3. These constraints are weakly affected by redshift errors. We close by speculating as to how this appr...
Proizvodnja celera u sustavu kap na kap Uvod U povijesti i mitologiji celeru su pridavana različi... more Proizvodnja celera u sustavu kap na kap Uvod U povijesti i mitologiji celeru su pridavana različita značenja: od simbola ljepote i veselja u doba Homera, simbola suza i žalosti kod starih Grka do simbola smrti u starih Rimljana. Oko dva stoljeća kasnije Rimljani su celerom ovjenčavali glave pobjednika i uzdignuli ga na simbol pobjedničkog slavlja. U današnje doba, iako je još nedovoljno zastupljeno povrće, koristi se u prehrani ljudi u svježoj potrošnji i u preradi. Odlikuje se visokim sadržajem vitamina (C, B1, B2) i minerala (K, Na, Ca, P, Fe, I, Cu) te vrlo povoljno djeluje na cijeli organizam, pogotovo pri preopterećenosti i umoru. Budući da je i diuretik, preporuča se kod reumatizma, bubrežnih kamenaca, celulita i prekomjerne težine. Snizuje koncentraciju šećera u krvi (dijabetičari). Celer (Apium graveolens) je dvogodišnja biljka koja u prvoj godini formira lisnu rozetu i korijen, a u drugoj cvjetnu stabljiku. S obzirom na dio biljke koji se koristi u prehrani, razlikujemo: • Zadebljali korijen-KORIJENAŠ (Apium graveolens var. rapaceum) • Peteljke-LISTAŠ (Apium graveolens var. dulce) • Listovi-LISTAŠ (Apium graveolens var. secalinum) Morfološke karakteristike celera Korijen je kod listaša i rebraša žiličast, a kod korijenaša zadebljao, okruglog ili oval-Sažetak Celer, iako još nedovoljno zastupljeno povrće u prehrani ljudi, odlikuje se visokom nutritivnom i zdravstvenom vrijednosti. U stalnoj utrci za postizanjem što bolje kvalitete i kvantitete te konkurentnosti proizvodnje, kontinuirano se poseže za poboljšanim načinima proizvodnje i usavršavanjem tehnologija. Globalizacijom i otvaranjem tržišta, kulture poput celera, koje su se nekada uzgajale samo u okućnicama, postale su zanimljive za uzgoj na većim površinama i na taj način dostupne svima. Ključne riječi: Apium graveolens, presadnice, sustav navodnjavanja kap na kap, gnojidba 1 dipl.ing. Dubravka Hefer, dipl.ing, Ivica Kovačić, dipl.ing. Bosiljka Božić-Sumrak-PIK Vinkovci, Matije Gupca 130, Vinkovci nog oblika. U donjem dijelu obrastao je postranim korjenčićima. Vanjska kora mu je dosta gruba, smećkaste boje, a unutrašnjost je bijela. Lišće čini rozetu i nalazi se na glavi korijena, a sastoji se od izduženih peteljki i krupnih, glatkih, urezanih plojki. Kod celera rebraša peteljke su znatno razvijene, sočne i bez mnogo celuloznih vlakana, a kod nekih sorata su bijele boje. Plojke listova posebno su razvijene kod listaša i izrazito su aromatične. Cvjetna stabljika naraste do 1m, razgranata je, a vrhovi grana završavaju štitastim cvatovima. Cvjetovi se nalaze na kratkim stapkama. Plod je kalavac smeđe boje, dužine 1,2 mm, promjera 0,6 mm, a ujedno predstavlja i sjeme. To je najsitnije sjeme od svih povrtlarskih kultura, što potvrđuje i podatak da masa 1000 sjemenki teži 0,4-0,5 g, a u 1 g ima 2000-2500 sjemenki. Pakiranje celera Proces pakiranja sastoji se od pranja, orezivanja, inspekcije i samog pakiranja celera. Celer se pakira u vrećice (5,10 kg) ili u kutije i nakon toga se na paletama distribuira u trgovačke i otkupne centre.
We present a model for the squeezed dark matter bispectrum, where the short modes are deep in the... more We present a model for the squeezed dark matter bispectrum, where the short modes are deep in the non-linear regime. We exploit the consistency relations for large-scale structures combined with a response function approach to write the squeezed bispectrum in terms of a few unknown functions of the short modes. We provide an ansatz for a fitting function for these response functions, checking that the resulting model is reliable when compared to the one-loop squeezed bispectrum. We then test the model against measured bispectra from numerical simulations for short modes ranging between k ∼ 0.1 h/Mpc, and k ∼ 0.7 h/Mpc at redshift z = 0. To evaluate the goodness of the fit of our model we implement a non-Gaussian covariance and find agreement within one standard deviation of the simulated data.
Journal of Cosmology and Astroparticle Physics, Jul 14, 2020
We write down the Lagrangian bias expansion in general relativity up to 4th order in terms of ope... more We write down the Lagrangian bias expansion in general relativity up to 4th order in terms of operators describing the curvature of an early-time hypersurface for comoving observers. They can be easily expanded in synchronous or comoving gauges. This is necessary for the computation of the one-loop halo bispectrum, where relativistic effects can be degenerate with a primordial non-Gaussian signal. Since the bispectrum couples scales, an accurate prediction of the squeezed limit behavior needs to be both non-linear and relativistic. We then evolve the Lagrangian bias operators in time in comoving gauge, obtaining non-local operators analogous to what is known in the Newtonian limit. Finally, we show how to renormalize the bias expansion at an arbitrary time and find that this is crucial in order to cancel unphysical 1/k 2 divergences in the large-scale power spectrum and bispectrum that could be mistaken for a contamination to the non-Gaussian signal.
Journal of Cosmology and Astroparticle Physics, Apr 1, 2022
Relativistic corrections to the evolution of structure can be used to test general relativity on ... more Relativistic corrections to the evolution of structure can be used to test general relativity on cosmological scales. They are also a well-known systematic contamination in the search for a primordial non-Gaussian signal. We present a numerical framework to generate RELativistic second-order Initial Conditions (RELIC) based on a generic (not necessarily separable) second-order kernel for the density perturbations. In order to keep the time complexity manageable we introduce a scale cut that separates long and short scales, and neglect the "short-short" coupling that will eventually be swamped by uncontrollable higher-order effects. To test our approach, we use the second-order Einstein-Boltzmann code SONG to provide the numerical second-order kernel in a ΛCDM model, and we demonstrate that the realisations generated by RELIC reproduce the bispectra well whenever at least one of the scales is a "long" mode. We then present a generic algorithm that takes a perturbed density field as an input and provides particle initial data that matches this input to arbitrary order in perturbations for a given particle-mesh scheme. We implement this algorithm in the relativistic N-body code gevolution to demonstrate how our framework can be used to set precise initial conditions for cosmological simulations of large-scale structure.
We study the information content of summary statistics built from the multi-scale topology of lar... more We study the information content of summary statistics built from the multi-scale topology of large-scale structures on primordial non-Gaussianity of the local and equilateral type. We use halo catalogs generated from numerical N-body simulations of the Universe on large scales as a proxy for observed galaxies. Besides calculating the Fisher matrix for halos in real space, we also check more realistic scenarios in redshift space. Without needing to take a distant observer approximation, we place the observer on a corner of the box. We also add redshift errors mimicking spectroscopic and photometric samples. We perform several tests to assess the reliability of our Fisher matrix, including the Gaussianity of our summary statistics and convergence. We find that the marginalized 1-σ uncertainties in redshift space are Δf NL loc ∼ 16 and Δf NL equi ∼ 41 on a survey volume of 1 (Gpc/h)3. These constraints are weakly affected by redshift errors. We close by speculating as to how this appr...
Proizvodnja celera u sustavu kap na kap Uvod U povijesti i mitologiji celeru su pridavana različi... more Proizvodnja celera u sustavu kap na kap Uvod U povijesti i mitologiji celeru su pridavana različita značenja: od simbola ljepote i veselja u doba Homera, simbola suza i žalosti kod starih Grka do simbola smrti u starih Rimljana. Oko dva stoljeća kasnije Rimljani su celerom ovjenčavali glave pobjednika i uzdignuli ga na simbol pobjedničkog slavlja. U današnje doba, iako je još nedovoljno zastupljeno povrće, koristi se u prehrani ljudi u svježoj potrošnji i u preradi. Odlikuje se visokim sadržajem vitamina (C, B1, B2) i minerala (K, Na, Ca, P, Fe, I, Cu) te vrlo povoljno djeluje na cijeli organizam, pogotovo pri preopterećenosti i umoru. Budući da je i diuretik, preporuča se kod reumatizma, bubrežnih kamenaca, celulita i prekomjerne težine. Snizuje koncentraciju šećera u krvi (dijabetičari). Celer (Apium graveolens) je dvogodišnja biljka koja u prvoj godini formira lisnu rozetu i korijen, a u drugoj cvjetnu stabljiku. S obzirom na dio biljke koji se koristi u prehrani, razlikujemo: • Zadebljali korijen-KORIJENAŠ (Apium graveolens var. rapaceum) • Peteljke-LISTAŠ (Apium graveolens var. dulce) • Listovi-LISTAŠ (Apium graveolens var. secalinum) Morfološke karakteristike celera Korijen je kod listaša i rebraša žiličast, a kod korijenaša zadebljao, okruglog ili oval-Sažetak Celer, iako još nedovoljno zastupljeno povrće u prehrani ljudi, odlikuje se visokom nutritivnom i zdravstvenom vrijednosti. U stalnoj utrci za postizanjem što bolje kvalitete i kvantitete te konkurentnosti proizvodnje, kontinuirano se poseže za poboljšanim načinima proizvodnje i usavršavanjem tehnologija. Globalizacijom i otvaranjem tržišta, kulture poput celera, koje su se nekada uzgajale samo u okućnicama, postale su zanimljive za uzgoj na većim površinama i na taj način dostupne svima. Ključne riječi: Apium graveolens, presadnice, sustav navodnjavanja kap na kap, gnojidba 1 dipl.ing. Dubravka Hefer, dipl.ing, Ivica Kovačić, dipl.ing. Bosiljka Božić-Sumrak-PIK Vinkovci, Matije Gupca 130, Vinkovci nog oblika. U donjem dijelu obrastao je postranim korjenčićima. Vanjska kora mu je dosta gruba, smećkaste boje, a unutrašnjost je bijela. Lišće čini rozetu i nalazi se na glavi korijena, a sastoji se od izduženih peteljki i krupnih, glatkih, urezanih plojki. Kod celera rebraša peteljke su znatno razvijene, sočne i bez mnogo celuloznih vlakana, a kod nekih sorata su bijele boje. Plojke listova posebno su razvijene kod listaša i izrazito su aromatične. Cvjetna stabljika naraste do 1m, razgranata je, a vrhovi grana završavaju štitastim cvatovima. Cvjetovi se nalaze na kratkim stapkama. Plod je kalavac smeđe boje, dužine 1,2 mm, promjera 0,6 mm, a ujedno predstavlja i sjeme. To je najsitnije sjeme od svih povrtlarskih kultura, što potvrđuje i podatak da masa 1000 sjemenki teži 0,4-0,5 g, a u 1 g ima 2000-2500 sjemenki. Pakiranje celera Proces pakiranja sastoji se od pranja, orezivanja, inspekcije i samog pakiranja celera. Celer se pakira u vrećice (5,10 kg) ili u kutije i nakon toga se na paletama distribuira u trgovačke i otkupne centre.
Uploads
Papers by Juan Calles