Cosmic strings, if they exist, source nonlinear and non-Gaussian perturbations all the way back to time of equal matter radiation (and earlier). Here, we compute mass function halos seeded by a scaling distribution cosmic string loops, compare results with predictions standard Gaussian $\mathrm{\ensuremath{\Lambda}}$ cold dark model. Assuming simple linear relation between stellar halo mass, also function. The contribution strings dominates at sufficiently high redshifts $z>{z}_{c}$ where...

We demonstrate that cosmic string loops may provide a joint resolution of two mysteries surrounding recently observed black holes. For tension in an appropriate range, large radius have the potential to nonlinearities early universe seed supermassive The more numerous smaller can then intermediate mass holes, including those with region between $65\text{ }\text{ }{M}_{\ensuremath{\bigodot}}$ and $135\text{ which standard hole formation scenarios predict no holes are able form, but been...

ABSTRACT The observation of quasars at high redshifts presents a mystery in the theory black hole formation. In order to source such objects, one often relies on presence heavy seeds ($M \approx 10^{4-6}{\rm M}_{\odot }$) place early times. Unfortunately, formation these are difficult realize within standard astrophysical context. Here, we investigate whether superconducting cosmic string loops can sufficiently strong overdensities universe address this mystery. We review set direct collapse...

By means of $N$-body simulations, we study early structure formation in the presence a scaling distribution cosmic string loops. Cosmic loops dominate high redshift halo mass function while fluctuations seeded by standard scenario at low redshifts. In our study, effects are taken into account displacing dark matter particles and their velocities initial time simulation amounts determined analytical analysis which makes use Zel'dovich approximation. We find that resulting is to good...

We consider theories with global monopole or texture defects and compute the number density of nonlinear seed fluctuations as a function mass redshift. Specifically, we focus on range which is expected to be relevant for seeding supermassive black holes. find that there an interesting symmetry breaking scales seeds larger what predicted in standard cosmological model Gaussian primordial fluctuations. Hence, may help light mounting tension between observations hole candidates at high redshifts.

By means of N-body simulations, we study early structure formation in the presence a scaling distribution cosmic string loops. Cosmic loops dominate high redshift halo mass function while fluctuations seeded by standard scenario at low redshifts. In our study, effects are taken into account displacing dark matter particles and their velocities initial time simulation amounts determined analytical analysis which makes use Zeldovich approximation. We find that resulting is to good...

Abstract Cosmic string loops are non-linear density fluctuations which form in the early universe and could play an important role explaining many phenomena tension with standard ΛCDM model. Hence, accretion process onto cosmic should be studied detail. Most previous works view as point masses ignore impact of a finite loop size. In this work, we utilize Zel'dovich approximation to calculate mass sourced by static extended time-averaged profile derived from trajectory oscillation, compare...

Recent observations from the James Webb Space Telescope (JWST) have uncovered an unexpectedly large abundance of massive, UV-bright galaxies at high redshifts $z \gtrsim 10$, presenting a significant challenge to established galaxy formation models within standard $\Lambda$CDM cosmological framework. Cosmic strings, predicted by wide range particle physics theories beyond Standard Model, provide promising potential explanation for these observations. They may act as additional gravitational...

We compute the energy spectrum of photons {and neutrinos} produced by unwinding a scaling distribution cosmic textures, and discuss implications for high rays, CMB spectral distortions. Textures lead to contribution photon flux which scales as E3 F(E) ∼ E3/2. Hence, tightest constraints on texture model come from highest energies primordial can reach us without being scattered other foregrounds. both μ type y While coming current COBE bounds are weaker than angular power CMB, future surveys...

Cosmic string loops are non-linear density fluctuations which form in the early universe and could play an important role explaining many phenomena tension with standard $\Lambda$CDM model. Hence, details of accretion process onto cosmic should be studied detail. Most previous works view as point masses ignore impact a finite loop size. In this work, we utilize Zel'dovich approximation to calculate mass sourced by static extended time-averaged profile derived from trajectory oscillation,...