We have developed a new method to extract halo merger rates from the Millennium Simulation. First, by removing superfluous mergers that are artifacts of the standard Friends-Of-Friends (FOF) halo identification algorithm, we find a lower merger rate compared to previous work. The reductions are more significant at lower redshifts and lower halo masses, and especially for minor mergers. Our new ...

It is inferred from the symmetrical and luminous X-ray emission of fossil groups that they are mature, relaxed galaxy systems. Cosmological simulations and observations focusing on their dark halo and inter-galactic medium properties confirm their early formation. Recent photometric observations suggest that, unlike the majority of non-fossil brightest group galaxies (BGGs), the central early-t...

Adopting an intergroup perspective, this research was designed to examine predictors of change in post-merger identification throughout a merger. Data were collected over three points of measurement from 157 students of a newly merged university. The first questionnaire was distributed 4 months after the implementation of the merger; the following two were distributed six months and a year ther...

The merger of two supermassive black holes is expected to produce a gravitational-wave signal detectable by the satellite LISA. The rate of supermassive-black-hole mergers is intimately connected to the halo merger rate, and the extended Press–Schechter formalism is often employed when calculating the rate at which these events will be observed by LISA. This merger theory is flawed and provides...

We examine contract forms used in stock mergers from the announcement of initial definitive agreement to the final completion or termination of the deal, as well as the renegotiation process in between. Within the incomplete contract framework, we first build a model that allows for renegotiation of the initial contract following the arrival of new information. We demonstrate that the signing o...

We assess the impact of merger policy on entry and entrepreneurship. Facing uncertainty about its prospects and foreseeing that it may wish to quit should profitability prove poor, a rational entrant considers possible exit routes. Horizontal merger reduces competition subsequently, lowering welfare in the short run, but also provides a valuable exit route. By facilitating exit and thus raising...

We assess the impact of merger policy on entry and entrepreneurship. Facing uncertainty about its prospects and foreseeing that it may wish to quit should profitability prove poor, a rational entrant considers possible exit routes. Horizontal merger reduces competition subsequently, lowering welfare in the short run, but also provides a valuable exit route. By facilitating exit and thus raising...

We analyze whether merger policy will be used to create global players, i.e. firms that are more competitive in world markets. In a model where firms in two countries serve their respective domestic markets plus a world market, we consider when a cost-reducing merger will be beneficial for the firms, the home country, and the world as a whole. National merger policies will generally be too rest...